What's in your tap water?
Enter your ZIP code to see what your local water system reported in its latest published water quality report. Every result links to its source and shows the report year.
Or pick your water system
- Baltimore City Department of Public Works (Baltimore City (also serves most of Baltimore County))
- City of Annapolis (Anne Arundel)
- City of Cambridge (Dorchester)
- City of Frederick (Frederick)
- City of Salisbury (Wicomico)
- Easton Utilities (Talbot)
- Harford County Department of Public Works (Harford)
- Howard County Department of Public Works (Howard)
- Town of Oxford (Talbot)
- Town of St. Michaels (Talbot)
- Town of Trappe (Talbot)
- WSSC Water (Montgomery and Prince George's)
Baltimore City (also serves most of Baltimore County) · Public water system
Baltimore City Department of Public Works
LeadMetals2.74 ppb15 ppbAction level2024
Your body
EPA has set a health goal of zero for lead because no safe level of exposure is known. In children, low-level lead exposure has been linked to lower IQ, learning and attention problems; in adults, to raised blood pressure and kidney effects. Pregnant women and young children are most at risk.
Your home & appliances
Lead itself does not damage plumbing, but its presence is a sign of corrosion: water chemistry that dissolves metal from pipes, solder, and fixtures.
What it is
A metal that usually gets into tap water from lead service lines, lead solder, and older brass fixtures inside buildings, not from the water source itself. Homes built before 1986 are more likely to have lead plumbing.
Exactly as reported
- Lead: 2.74 ppb (90th percentile) · range <2–7.09 · Action level 15 · health goal 0 · violation: No · sampled 2024
PFASIndustrial & farm chemicals · 5 resultsAshburton 2.9 · Montebello 1.9 ppt +4 more4 pptMCL2025
Your body
Exposure to certain PFAS, such as PFOA and PFOS, has been linked to effects including changes in cholesterol, reduced vaccine response in children, lower birth weight, and increased risk of some cancers (EPA; Fenton et al., 2021). In 2024, EPA set drinking water limits for several PFAS.
Your home & appliances
PFAS do not affect plumbing or appliances.
What it is
Per- and polyfluoroalkyl substances are a large family of man-made chemicals used since the 1940s in non-stick, stain- and water-resistant products and firefighting foams. They break down very slowly in the environment and the body.
Exactly as reported
- PFOA: Ashburton 2.9 · Montebello 1.9 ppt (highest level detected by plant) · MCL 4 · health goal 0 · violation: No · sampled 2025Note: The report notes these PFAS MCLs are scheduled to go into effect April 26, 2029.
- PFOS: Ashburton 3.3 · Montebello 1.7 ppt (highest level detected by plant) · MCL 4 · health goal 0 · violation: No · sampled 2025Note: The report notes these PFAS MCLs are scheduled to go into effect April 26, 2029.
- PFBS: Ashburton 1.8 · Montebello 2.2 ppt (highest level detected by plant) · limit Used to calculate Hazard Index · violation: No · sampled 2025
- PFAS Hazard Index (PFBS + PFHxS + PFNA + HFPO-DA): Ashburton 0.0009 · Montebello 0.003 Hazard Index (highest level detected by plant) · MCL 1.0 · health goal 1.0 · violation: No · sampled 2025
- PFHxA (unregulated): Ashburton 2.90 · Montebello 2.08 ppt (result by plant) · violation: No · sampled 2025
NitrateNutrientsAshburton 5.81 · Montebello 1.57 ppm10 ppmMCL2025
Your body
According to EPA, infants under six months who drink water with nitrate above the federal limit could become seriously ill (blue baby syndrome). Research has also examined links between long-term exposure and other health effects.
Your home & appliances
Nitrate does not harm plumbing. It can indicate that surface water or septic waste is reaching a well.
What it is
A form of nitrogen from fertilizer, manure, and septic systems that can soak into groundwater. It is a common concern in farming areas, including much of the Eastern Shore.
Exactly as reported
- Nitrate: Ashburton 5.81 · Montebello 1.57 ppm (highest result by plant) · range 0.41–5.81 · MCL 10 · health goal 10 · violation: No · sampled 2025
Total TrihalomethanesDisinfection byproducts77 ppb80 ppbMCL2025
Your body
According to EPA, long-term exposure above the federal limit has been linked to liver, kidney, or central nervous system problems and an increased risk of cancer. Studies have associated long-term exposure to chlorination byproducts with bladder cancer.
Your home & appliances
Trihalomethanes do not affect plumbing. They can also be inhaled during hot showers.
What it is
A group of four chemicals (chloroform, bromodichloromethane, dibromochloromethane, bromoform) that form when chlorine reacts with natural organic matter in water. Levels are usually higher at the far ends of a distribution system and in warm months.
Exactly as reported
- Total THMs: 77 ppb (highest locational running annual average) · range 23–133 · MCL 80 · health goal NA · violation: No · sampled 2025
Haloacetic AcidsDisinfection byproducts46 ppb60 ppbMCL2025
Your body
According to EPA, long-term exposure above the federal limit has been linked to an increased risk of cancer.
Your home & appliances
Haloacetic acids do not affect plumbing.
What it is
Five related chemicals that form when chlorine reacts with natural organic matter in water. Like TTHM, they are tracked at points around the distribution system.
Exactly as reported
- HAA (5): 46 ppb (highest locational running annual average) · range 6–53 · MCL 60 · health goal NA · violation: No · sampled 2025
RadiumRadiological1.6 pCi/L5 pCi/LMCL2025
Your body
According to EPA, long-term exposure above the federal limit has been linked to an increased risk of cancer.
Your home & appliances
Radium does not affect plumbing, but it can build up in softener resin and filter media.
What it is
A naturally occurring radioactive element in some rock and soil, found in certain Maryland aquifers. Reports list radium-226, radium-228, or the two combined.
Exactly as reported
- Combined Radium 226/228: 1.6 pCi/L (highest level detected) · range 0.2–1.6 · MCL 5 · health goal 0 · violation: No · sampled 2025
Coliform bacteria & E. coliMicrobes1.31% % of monthly samples5% of monthly samples positiveMCL2025
Your body
According to EPA, germs indicated by E. coli can cause stomach cramps, diarrhea, nausea, and headaches, and may pose a special risk for infants, young children, and people with severely compromised immune systems.
Your home & appliances
Bacteria do not damage plumbing, but in wells they can point to a cracked well cap, a damaged casing, or nearby septic issues.
What it is
Coliforms are bacteria that are common in the environment. Water systems test for them as an indicator: their presence means germs may be able to get into the water. E. coli is a specific type that indicates fecal contamination.
Exactly as reported
- Total Coliform: 1.31% % of monthly samples (highest monthly percentage of samples with total coliform present) · MCL 5% of monthly samples positive · health goal 0 · violation: No · sampled 2025
CopperMetals112 ppb1,300 ppbAction level2024
Your body
According to EPA, short-term exposure above the action level has been linked to stomach and intestinal upset. Long-term exposure has been linked to liver or kidney damage, and people with Wilson’s disease are more sensitive.
Your home & appliances
Copper in water points to pipe corrosion, which can lead to pinhole leaks over time. It also leaves blue-green stains on sinks, tubs, and fixtures.
What it is
A metal that mostly enters tap water from corrosion of copper pipes and brass fixtures, especially when water is acidic (low pH) or sits in pipes for hours.
Exactly as reported
- Copper: 112 ppb (90th percentile) · range 14.4–402.0 · Action level 1,300 · health goal 1,300 · violation: No · sampled 2024
FluorideMineralsAshburton 0.90 · Montebello 1.09 ppm4 ppmMCL2025
Your body
EPA sets an enforceable limit of 4.0 mg/L and a secondary standard of 2.0 mg/L. According to EPA, long-term exposure above 4.0 mg/L has been linked to bone disease, and children exposed above 2.0 mg/L may develop dental fluorosis (tooth discoloration or pitting). A 2024 federal NTP review examined fluoride exposure above 1.5 mg/L and children’s IQ.
Your home & appliances
Fluoride does not affect plumbing.
What it is
A mineral that occurs naturally in some groundwater and that many public water systems add at low levels to help prevent tooth decay.
Exactly as reported
- Fluoride: Ashburton 0.90 · Montebello 1.09 ppm (highest result by plant) · range 0.07–1.09 · MCL 4 · health goal 4 · violation: No · sampled 2025
ChlorineDisinfectants0.52 ppm4 ppmMax. disinfectant2025
Your body
According to EPA, people drinking water containing chlorine well in excess of the federal limit could experience eye or nose irritation or stomach discomfort. Disinfection itself is an important public health protection.
Your home & appliances
Chlorine causes the “pool” taste and smell many people notice. Over time it can dry out rubber seals and gaskets in fixtures and appliances.
What it is
Public water systems are required to disinfect water to control germs, and most use chlorine or chloramine. A small amount stays in the water all the way to your tap.
Exactly as reported
- Chlorine: 0.52 ppm (distribution system running annual average) · range Plant highest: Ashburton 1.14 · Montebello 1.20 · Max. disinfectant 4 · health goal 4 · violation: No · sampled 2025
BariumMetalsAshburton 0.0238 · Montebello 0.0407 ppm2 ppmMCL2025
Your body
According to EPA, long-term exposure above the federal limit has been linked to increased blood pressure.
Your home & appliances
Barium can add to the mineral scale that builds up in water heaters and pipes.
What it is
A naturally occurring metal found in many rock formations, plus discharges from drilling and metal refining.
Exactly as reported
- Barium: Ashburton 0.0238 · Montebello 0.0407 ppm (highest result by plant) · range 0.0199–0.0407 · MCL 2 · health goal 2 · violation: No · sampled 2025
TurbidityWater qualityAshburton 0.12 · Montebello 0.22 NTUTreatment techniqueMCL2025
Your body
Turbidity itself has no health effects, but according to EPA, it can interfere with disinfection and give germs a place to grow.
Your home & appliances
Sediment that causes cloudy water can clog faucet aerators, valves, and appliance inlets.
What it is
Turbidity measures how cloudy water is, from suspended particles like silt and clay. Water systems monitor it to show how well their filtration works.
Exactly as reported
- Turbidity: Ashburton 0.12 · Montebello 0.22 NTU (highest result by plant) · MCL Treatment technique · violation: No · sampled 2025
Source: Baltimore City Department of Public Works, 2025 Consumer Confidence Report (Annual Water Quality Report) (published 2026, covering 2025), via the Maryland Department of the Environment. Values appear as printed. Detected doesn't mean unsafe; most results are below federal limits.
Anne Arundel · Public water system
City of Annapolis
LeadMetals<0.63 ppb15 ppbAction levelSep 2023
Your body
EPA has set a health goal of zero for lead because no safe level of exposure is known. In children, low-level lead exposure has been linked to lower IQ, learning and attention problems; in adults, to raised blood pressure and kidney effects. Pregnant women and young children are most at risk.
Your home & appliances
Lead itself does not damage plumbing, but its presence is a sign of corrosion: water chemistry that dissolves metal from pipes, solder, and fixtures.
What it is
A metal that usually gets into tap water from lead service lines, lead solder, and older brass fixtures inside buildings, not from the water source itself. Homes built before 1986 are more likely to have lead plumbing.
Exactly as reported
- Lead: <0.63 ppb (90th percentile) · range ND–3.4 · Action level 15 · violation: No · sampled Sep 2023
Total TrihalomethanesDisinfection byproducts4.6 ppb80 ppbMCLOct 2025
Your body
According to EPA, long-term exposure above the federal limit has been linked to liver, kidney, or central nervous system problems and an increased risk of cancer. Studies have associated long-term exposure to chlorination byproducts with bladder cancer.
Your home & appliances
Trihalomethanes do not affect plumbing. They can also be inhaled during hot showers.
What it is
A group of four chemicals (chloroform, bromodichloromethane, dibromochloromethane, bromoform) that form when chlorine reacts with natural organic matter in water. Levels are usually higher at the far ends of a distribution system and in warm months.
Exactly as reported
- Total Trihalomethanes (Stage 2): 4.6 ppb (highest level detected) · range 2.3–4.6 · MCL 80 · health goal n/a · violation: No · sampled Oct 2025
Haloacetic AcidsDisinfection byproducts0.65 ppb60 ppbMCLOct 2025
Your body
According to EPA, long-term exposure above the federal limit has been linked to an increased risk of cancer.
Your home & appliances
Haloacetic acids do not affect plumbing.
What it is
Five related chemicals that form when chlorine reacts with natural organic matter in water. Like TTHM, they are tracked at points around the distribution system.
Exactly as reported
- Haloacetic Acids (HAA5): 0.65 ppb (highest level detected) · range 0–0.65 · MCL 60 · health goal n/a · violation: No · sampled Oct 2025
CopperMetals<0.021 ppm1.3 ppmAction levelSep 2023
Your body
According to EPA, short-term exposure above the action level has been linked to stomach and intestinal upset. Long-term exposure has been linked to liver or kidney damage, and people with Wilson’s disease are more sensitive.
Your home & appliances
Copper in water points to pipe corrosion, which can lead to pinhole leaks over time. It also leaves blue-green stains on sinks, tubs, and fixtures.
What it is
A metal that mostly enters tap water from corrosion of copper pipes and brass fixtures, especially when water is acidic (low pH) or sits in pipes for hours.
Exactly as reported
- Copper: <0.021 ppm (90th percentile) · range ND–0.04 · Action level 1.3 · violation: No · sampled Sep 2023
FluorideMinerals0.98 ppm4 ppmMCL2025
Your body
EPA sets an enforceable limit of 4.0 mg/L and a secondary standard of 2.0 mg/L. According to EPA, long-term exposure above 4.0 mg/L has been linked to bone disease, and children exposed above 2.0 mg/L may develop dental fluorosis (tooth discoloration or pitting). A 2024 federal NTP review examined fluoride exposure above 1.5 mg/L and children’s IQ.
Your home & appliances
Fluoride does not affect plumbing.
What it is
A mineral that occurs naturally in some groundwater and that many public water systems add at low levels to help prevent tooth decay.
Exactly as reported
- Fluoride: 0.98 ppm (highest level detected) · range 0.19–0.98 · MCL 4 · health goal 4 · violation: No · sampled 2025
ChlorineDisinfectants1 ppm4 ppmMax. disinfectantWeekly 2025
Your body
According to EPA, people drinking water containing chlorine well in excess of the federal limit could experience eye or nose irritation or stomach discomfort. Disinfection itself is an important public health protection.
Your home & appliances
Chlorine causes the “pool” taste and smell many people notice. Over time it can dry out rubber seals and gaskets in fixtures and appliances.
What it is
Public water systems are required to disinfect water to control germs, and most use chlorine or chloramine. A small amount stays in the water all the way to your tap.
Exactly as reported
- Chlorine: 1 ppm (highest level detected) · range 0.58–1.18 · Max. disinfectant 4 · health goal 4 · violation: No · sampled Weekly 2025
BariumMetals0.0072 ppm2 ppmMCLJan 2025
Your body
According to EPA, long-term exposure above the federal limit has been linked to increased blood pressure.
Your home & appliances
Barium can add to the mineral scale that builds up in water heaters and pipes.
What it is
A naturally occurring metal found in many rock formations, plus discharges from drilling and metal refining.
Exactly as reported
- Barium: 0.0072 ppm (highest level detected) · MCL 2 · health goal 2 · violation: No · sampled Jan 2025
LithiumMetals8.4 ppbNo federal limitJul 2024
Your body
There is no federal drinking water limit for lithium. EPA is collecting nationwide data through UCMR 5 to support decisions about possible health effects.
Your home & appliances
At drinking-water levels, lithium does not affect plumbing or appliances.
What it is
A naturally occurring metal found in rock and groundwater. EPA has public water systems test for it under its Fifth Unregulated Contaminant Monitoring Rule (UCMR 5) to decide whether it needs a standard.
Exactly as reported
- Lithium (unregulated): 8.4 ppb (highest level detected) · violation: No · sampled Jul 2024
Source: City of Annapolis, 2025 Annual Water Quality Report (published 2026, covering 2025), via the Maryland Department of the Environment. Values appear as printed. Detected doesn't mean unsafe; most results are below federal limits.
Dorchester · Public water system
City of Cambridge
LeadMetals4.1 ppb15 ppbAction level2023
Your body
EPA has set a health goal of zero for lead because no safe level of exposure is known. In children, low-level lead exposure has been linked to lower IQ, learning and attention problems; in adults, to raised blood pressure and kidney effects. Pregnant women and young children are most at risk.
Your home & appliances
Lead itself does not damage plumbing, but its presence is a sign of corrosion: water chemistry that dissolves metal from pipes, solder, and fixtures.
What it is
A metal that usually gets into tap water from lead service lines, lead solder, and older brass fixtures inside buildings, not from the water source itself. Homes built before 1986 are more likely to have lead plumbing.
Exactly as reported
- Lead: 4.1 ppb (90th percentile) · range ND–4.6 · Action level 15 · health goal 0 · violation: No · sampled 2023
ArsenicMetals1.5 ppb10 ppbMCL2024
Your body
Long-term exposure has been linked to skin changes, circulatory problems, and an increased risk of bladder, lung, and skin cancers (EPA, WHO). EPA’s health goal is zero.
Your home & appliances
Arsenic at levels found in drinking water does not usually harm plumbing or appliances.
What it is
A naturally occurring element found in some rock and soil, and in past use in pesticides and wood preservatives. It has no taste, color, or smell. Some Maryland aquifers contain natural arsenic.
Exactly as reported
- Arsenic: 1.5 ppb (amount detected) · range ND–1.5 · MCL 10 · health goal 0 · violation: No · sampled 2024
Total TrihalomethanesDisinfection byproducts21 ppb80 ppbMCL2025
Your body
According to EPA, long-term exposure above the federal limit has been linked to liver, kidney, or central nervous system problems and an increased risk of cancer. Studies have associated long-term exposure to chlorination byproducts with bladder cancer.
Your home & appliances
Trihalomethanes do not affect plumbing. They can also be inhaled during hot showers.
What it is
A group of four chemicals (chloroform, bromodichloromethane, dibromochloromethane, bromoform) that form when chlorine reacts with natural organic matter in water. Levels are usually higher at the far ends of a distribution system and in warm months.
Exactly as reported
- Total Trihalomethanes [TTHMs]: 21 ppb (amount detected) · range 6.1–22.7 · MCL 80 · health goal NA · violation: No · sampled 2025
Haloacetic AcidsDisinfection byproducts11 ppb60 ppbMCL2025
Your body
According to EPA, long-term exposure above the federal limit has been linked to an increased risk of cancer.
Your home & appliances
Haloacetic acids do not affect plumbing.
What it is
Five related chemicals that form when chlorine reacts with natural organic matter in water. Like TTHM, they are tracked at points around the distribution system.
Exactly as reported
- Haloacetic Acids [HAA5]: 11 ppb (amount detected) · range ND–7.3 · MCL 60 · health goal NA · violation: No · sampled 2025
Beta/photon emittersRadiological8.9 pCi/L50 pCi/LMCL2024
Your body
According to EPA, long-term exposure above the federal limit has been linked to an increased risk of cancer.
Your home & appliances
Beta emitters do not affect plumbing.
What it is
A screening measurement of beta radiation in water, from natural minerals (like potassium-40) and some human-made sources. Water systems compare results to a 50 pCi/L screening level.
Exactly as reported
- Beta/Photon Emitters: 8.9 pCi/L (amount detected) · MCL 50 · health goal 0 · violation: No · sampled 2024
CopperMetals0.18 ppm1.3 ppmAction level2023
Your body
According to EPA, short-term exposure above the action level has been linked to stomach and intestinal upset. Long-term exposure has been linked to liver or kidney damage, and people with Wilson’s disease are more sensitive.
Your home & appliances
Copper in water points to pipe corrosion, which can lead to pinhole leaks over time. It also leaves blue-green stains on sinks, tubs, and fixtures.
What it is
A metal that mostly enters tap water from corrosion of copper pipes and brass fixtures, especially when water is acidic (low pH) or sits in pipes for hours.
Exactly as reported
- Copper: 0.18 ppm (90th percentile) · range ND–0.34 · Action level 1.3 · health goal 1.3 · violation: No · sampled 2023
FluorideMinerals1.2 ppm4 ppmMCL2024
Your body
EPA sets an enforceable limit of 4.0 mg/L and a secondary standard of 2.0 mg/L. According to EPA, long-term exposure above 4.0 mg/L has been linked to bone disease, and children exposed above 2.0 mg/L may develop dental fluorosis (tooth discoloration or pitting). A 2024 federal NTP review examined fluoride exposure above 1.5 mg/L and children’s IQ.
Your home & appliances
Fluoride does not affect plumbing.
What it is
A mineral that occurs naturally in some groundwater and that many public water systems add at low levels to help prevent tooth decay.
Exactly as reported
- Fluoride: 1.2 ppm (amount detected) · range 1.1–1.2 · MCL 4 · health goal 4 · violation: No · sampled 2024
ChlorineDisinfectants0.5 ppm4 ppmMax. disinfectant2025
Your body
According to EPA, people drinking water containing chlorine well in excess of the federal limit could experience eye or nose irritation or stomach discomfort. Disinfection itself is an important public health protection.
Your home & appliances
Chlorine causes the “pool” taste and smell many people notice. Over time it can dry out rubber seals and gaskets in fixtures and appliances.
What it is
Public water systems are required to disinfect water to control germs, and most use chlorine or chloramine. A small amount stays in the water all the way to your tap.
Exactly as reported
- Chlorine: 0.5 ppm (amount detected) · range 0.1–1.1 · Max. disinfectant 4 · health goal 4 · violation: No · sampled 2025
BariumMetals0.0053 ppm2 ppmMCL2024
Your body
According to EPA, long-term exposure above the federal limit has been linked to increased blood pressure.
Your home & appliances
Barium can add to the mineral scale that builds up in water heaters and pipes.
What it is
A naturally occurring metal found in many rock formations, plus discharges from drilling and metal refining.
Exactly as reported
- Barium: 0.0053 ppm (amount detected) · range ND–0.0053 · MCL 2 · health goal 2 · violation: No · sampled 2024
ChromiumMetals0.0056 ppm2 ppmMCL2024
Your body
According to EPA, long-term exposure above the federal limit has been linked to allergic dermatitis. Chromium-6 is the more toxic form and is under ongoing EPA review.
Your home & appliances
At drinking-water levels, chromium does not usually affect plumbing or appliances.
What it is
A metal found naturally in rocks and soil and released by steel, pulp, and other industries. Water reports usually list “total chromium,” which includes chromium-3 and chromium-6.
Exactly as reported
- Chromium: 0.0056 ppm (amount detected) · range 0.0043–0.0056 · MCL 2 · health goal 2 · violation: No · sampled 2024Note: The report lists an MCL and MCLG of 2 ppm for chromium. The federal MCL for total chromium is 0.1 ppm (EPA).
SodiumMinerals139 ppmNo federal limit2021
Your body
Sodium in water is a small part of most people’s daily intake. People on sodium-restricted diets may want to talk to their doctor; EPA guidance mentions 20 mg/L for people on very low-sodium diets.
Your home & appliances
Sodium itself does not usually affect plumbing.
What it is
A naturally occurring element in groundwater. It also comes from road salt, some water treatment chemicals, and water softeners.
Exactly as reported
- Sodium (unregulated): 139 ppm (amount detected) · range 59–139 · sampled 2021
LithiumMetals7.43 ppbNo federal limit2024
Your body
There is no federal drinking water limit for lithium. EPA is collecting nationwide data through UCMR 5 to support decisions about possible health effects.
Your home & appliances
At drinking-water levels, lithium does not affect plumbing or appliances.
What it is
A naturally occurring metal found in rock and groundwater. EPA has public water systems test for it under its Fifth Unregulated Contaminant Monitoring Rule (UCMR 5) to decide whether it needs a standard.
Exactly as reported
- Lithium (unregulated, UCMR 5): 7.43 ppb (amount detected) · range ND–15.8 · sampled 2024
- Radium: Combined radium (2024) is listed in the report as not detected (ND).
Source: City of Cambridge, Annual Water Quality Report (Reporting Year 2025) (published 2026, covering 2025), via the Maryland Department of the Environment. Values appear as printed. Detected doesn't mean unsafe; most results are below federal limits.
Frederick · Public water system
City of Frederick
LeadMetals1.6 ppb15 ppbAction level2024
Your body
EPA has set a health goal of zero for lead because no safe level of exposure is known. In children, low-level lead exposure has been linked to lower IQ, learning and attention problems; in adults, to raised blood pressure and kidney effects. Pregnant women and young children are most at risk.
Your home & appliances
Lead itself does not damage plumbing, but its presence is a sign of corrosion: water chemistry that dissolves metal from pipes, solder, and fixtures.
What it is
A metal that usually gets into tap water from lead service lines, lead solder, and older brass fixtures inside buildings, not from the water source itself. Homes built before 1986 are more likely to have lead plumbing.
Exactly as reported
- Lead: 1.6 ppb (90th percentile) · range ND–6.40 · Action level 15 · health goal 0 · violation: No · sampled 2024
PFASIndustrial & farm chemicals · 3 results4.5 ppt +2 moreNo federal limit2025
Your body
Exposure to certain PFAS, such as PFOA and PFOS, has been linked to effects including changes in cholesterol, reduced vaccine response in children, lower birth weight, and increased risk of some cancers (EPA; Fenton et al., 2021). In 2024, EPA set drinking water limits for several PFAS.
Your home & appliances
PFAS do not affect plumbing or appliances.
What it is
Per- and polyfluoroalkyl substances are a large family of man-made chemicals used since the 1940s in non-stick, stain- and water-resistant products and firefighting foams. They break down very slowly in the environment and the body.
Exactly as reported
- PFOS: 4.5 ppt (amount detected) · range ND–4.5 · sampled 2025Note: Listed under unregulated substances. The report notes that the MCLs for these PFAS do not go into effect until 2029 (the PFOS MCL will be 4.0 ppt).
- PFOA: 2.9 ppt (amount detected) · range ND–2.9 · sampled 2025Note: Listed under unregulated substances. The report notes that the MCLs for these PFAS do not go into effect until 2029.
- PFBS, PFHxS, PFHxA, PFPeA: PFBS 3.9 · PFHxS 1.5 · PFHxA 2.4 · PFPeA 3.3 (2024) ppt (amount detected) · sampled 2024–2025
NitrateNutrients1.9 ppm10 ppmMCL2025
Your body
According to EPA, infants under six months who drink water with nitrate above the federal limit could become seriously ill (blue baby syndrome). Research has also examined links between long-term exposure and other health effects.
Your home & appliances
Nitrate does not harm plumbing. It can indicate that surface water or septic waste is reaching a well.
What it is
A form of nitrogen from fertilizer, manure, and septic systems that can soak into groundwater. It is a common concern in farming areas, including much of the Eastern Shore.
Exactly as reported
- Nitrate: 1.9 ppm (amount detected) · range ND–1.9 · MCL 10 · health goal 10 · violation: No · sampled 2025
Total TrihalomethanesDisinfection byproducts · 2 results72.7 ppb +1 more80 ppbMCL2025
Your body
According to EPA, long-term exposure above the federal limit has been linked to liver, kidney, or central nervous system problems and an increased risk of cancer. Studies have associated long-term exposure to chlorination byproducts with bladder cancer.
Your home & appliances
Trihalomethanes do not affect plumbing. They can also be inhaled during hot showers.
What it is
A group of four chemicals (chloroform, bromodichloromethane, dibromochloromethane, bromoform) that form when chlorine reacts with natural organic matter in water. Levels are usually higher at the far ends of a distribution system and in warm months.
Exactly as reported
- Total Trihalomethanes [TTHMs]: 72.7 ppb (amount detected) · range 13.3–102.3 · MCL 80 · health goal NA · violation: No · sampled 2025
- Bromodichloromethane, Chloroform, Dibromochloromethane (unregulated individually): Bromodichloromethane 5.13 · Chloroform 20.1 · Dibromochloromethane 0.61 ppb (amount detected) · range 0.6–20.1 · sampled 2025Note: These are individual trihalomethanes. Together they count toward the TTHM limit of 80 ppb.
Haloacetic AcidsDisinfection byproducts43.2 ppb60 ppbMCL2025
Your body
According to EPA, long-term exposure above the federal limit has been linked to an increased risk of cancer.
Your home & appliances
Haloacetic acids do not affect plumbing.
What it is
Five related chemicals that form when chlorine reacts with natural organic matter in water. Like TTHM, they are tracked at points around the distribution system.
Exactly as reported
- Haloacetic Acids [HAA5]: 43.2 ppb (amount detected) · range 13.8–48.8 · MCL 60 · health goal NA · violation: No · sampled 2025
Gross alpha activityRadiological2.7 pCi/L15 pCi/LMCL2021
Your body
According to EPA, long-term exposure above the federal limit has been linked to an increased risk of cancer.
Your home & appliances
Alpha emitters do not affect plumbing.
What it is
A screening measurement of total alpha radiation in water, mostly from natural uranium, radium, and related elements in rock.
Exactly as reported
- Alpha Emitters: 2.7 pCi/L (amount detected) · range ND–2.7 · MCL 15 · health goal 0 · violation: No · sampled 2021
Beta/photon emittersRadiological7.3 pCi/L50 pCi/LMCL2021
Your body
According to EPA, long-term exposure above the federal limit has been linked to an increased risk of cancer.
Your home & appliances
Beta emitters do not affect plumbing.
What it is
A screening measurement of beta radiation in water, from natural minerals (like potassium-40) and some human-made sources. Water systems compare results to a 50 pCi/L screening level.
Exactly as reported
- Beta/Photon Emitters: 7.3 pCi/L (amount detected) · range ND–7.3 · MCL 50 · health goal 0 · violation: No · sampled 2021
Coliform bacteria & E. coliMicrobes3.8% % of samples5%MCL2025
Your body
According to EPA, germs indicated by E. coli can cause stomach cramps, diarrhea, nausea, and headaches, and may pose a special risk for infants, young children, and people with severely compromised immune systems.
Your home & appliances
Bacteria do not damage plumbing, but in wells they can point to a cracked well cap, a damaged casing, or nearby septic issues.
What it is
Coliforms are bacteria that are common in the environment. Water systems test for them as an indicator: their presence means germs may be able to get into the water. E. coli is a specific type that indicates fecal contamination.
Exactly as reported
- Coliform Bacteria (positive samples): 3.8% % of samples (amount detected) · MCL 5% · health goal 0 · violation: No · sampled 2025
CopperMetals0.123 ppm1.3 ppmAction level2024
Your body
According to EPA, short-term exposure above the action level has been linked to stomach and intestinal upset. Long-term exposure has been linked to liver or kidney damage, and people with Wilson’s disease are more sensitive.
Your home & appliances
Copper in water points to pipe corrosion, which can lead to pinhole leaks over time. It also leaves blue-green stains on sinks, tubs, and fixtures.
What it is
A metal that mostly enters tap water from corrosion of copper pipes and brass fixtures, especially when water is acidic (low pH) or sits in pipes for hours.
Exactly as reported
- Copper: 0.123 ppm (90th percentile) · range ND–0.21 · Action level 1.3 · health goal 1.3 · violation: No · sampled 2024
FluorideMinerals0.74 ppm4 ppmMCL2025
Your body
EPA sets an enforceable limit of 4.0 mg/L and a secondary standard of 2.0 mg/L. According to EPA, long-term exposure above 4.0 mg/L has been linked to bone disease, and children exposed above 2.0 mg/L may develop dental fluorosis (tooth discoloration or pitting). A 2024 federal NTP review examined fluoride exposure above 1.5 mg/L and children’s IQ.
Your home & appliances
Fluoride does not affect plumbing.
What it is
A mineral that occurs naturally in some groundwater and that many public water systems add at low levels to help prevent tooth decay.
Exactly as reported
- Fluoride: 0.74 ppm (amount detected) · range 0.51–0.74 · MCL 4 · health goal 4 · violation: No · sampled 2025
ChlorineDisinfectants1.22 ppm4 ppmMax. disinfectant2025
Your body
According to EPA, people drinking water containing chlorine well in excess of the federal limit could experience eye or nose irritation or stomach discomfort. Disinfection itself is an important public health protection.
Your home & appliances
Chlorine causes the “pool” taste and smell many people notice. Over time it can dry out rubber seals and gaskets in fixtures and appliances.
What it is
Public water systems are required to disinfect water to control germs, and most use chlorine or chloramine. A small amount stays in the water all the way to your tap.
Exactly as reported
- Chlorine: 1.22 ppm (amount detected) · range 0.98–1.22 · Max. disinfectant 4 · health goal 4 · violation: No · sampled 2025
AtrazineIndustrial & farm chemicals0.73 ppb3 ppbMCL2025
Your body
According to EPA, long-term exposure above the federal limit has been linked to cardiovascular system and reproductive problems.
Your home & appliances
Atrazine does not affect plumbing.
What it is
A widely used herbicide on corn and other row crops that can wash into rivers and groundwater after rain.
Exactly as reported
- Atrazine: 0.73 ppb (amount detected) · range ND–0.73 · MCL 3 · health goal 3 · violation: No · sampled 2025
BariumMetals0.038 ppm2 ppmMCL2025
Your body
According to EPA, long-term exposure above the federal limit has been linked to increased blood pressure.
Your home & appliances
Barium can add to the mineral scale that builds up in water heaters and pipes.
What it is
A naturally occurring metal found in many rock formations, plus discharges from drilling and metal refining.
Exactly as reported
- Barium: 0.038 ppm (amount detected) · range ND–0.038 · MCL 2 · health goal 2 · violation: No · sampled 2025
SimazineIndustrial & farm chemicals0.24 ppb4 ppbMCL2025
Your body
According to EPA, long-term exposure above the federal limit has been linked to blood problems.
Your home & appliances
Simazine does not affect plumbing.
What it is
A herbicide related to atrazine, used to control weeds. It can run off into surface water.
Exactly as reported
- Simazine: 0.24 ppb (amount detected) · range ND–0.24 · MCL 4 · health goal 4 · violation: No · sampled 2025
TurbidityWater quality0.26 NTUTTMCL2025
Your body
Turbidity itself has no health effects, but according to EPA, it can interfere with disinfection and give germs a place to grow.
Your home & appliances
Sediment that causes cloudy water can clog faucet aerators, valves, and appliance inlets.
What it is
Turbidity measures how cloudy water is, from suspended particles like silt and clay. Water systems monitor it to show how well their filtration works.
Exactly as reported
- Maximum Turbidity: 0.26 NTU (amount detected) · MCL TT · violation: No · sampled 2025
AluminumMetals0.081 ppb200 ppbSecondary2025
Your body
EPA regulates aluminum only as a secondary (cosmetic) standard, based on color. ATSDR has more on its health effects at higher exposures.
Your home & appliances
At higher levels aluminum can cause water discoloration.
What it is
A common element in soil and rock. Small amounts can remain after some water treatment processes that use aluminum compounds to settle out particles.
Exactly as reported
- Aluminum (secondary): 0.081 ppb (amount detected) · range ND–0.081 · Secondary 200 · violation: No · sampled 2025Note: Shown as printed; the unit column reads ppb.
ChlorideMinerals35.9 ppm250 ppmSecondary2025
Your body
EPA regulates chloride only as a secondary (taste) standard.
Your home & appliances
High chloride gives water a salty taste and can speed up corrosion of metal pipes and water heaters.
What it is
A common salt component from natural deposits, road salt runoff, and saltwater intrusion near the coast.
Exactly as reported
- Chloride (secondary): 35.9 ppm (amount detected) · range 5.2–35.9 · Secondary 250 · violation: No · sampled 2025
IronMinerals290 ppb300 ppbSecondary2025
Your body
EPA treats iron as a cosmetic (secondary) issue rather than a health risk at levels found in drinking water.
Your home & appliances
Iron causes orange-brown stains on sinks, tubs, toilets, and laundry, and a metallic taste. It can also feed iron bacteria and clog pipes, valves, and water treatment equipment.
What it is
A common natural mineral in Maryland groundwater, especially on the Eastern Shore. It can also come from rusting pipes.
Exactly as reported
- Iron (secondary): 290 ppb (amount detected) · range ND–290 · Secondary 300 · violation: No · sampled 2025
SulfateMinerals44.4 ppm250 ppmSecondary2025
Your body
EPA regulates sulfate as a secondary standard. At high levels it can have a laxative effect on people not used to it.
Your home & appliances
High sulfate can give water a bitter taste and contribute to scale.
What it is
A naturally occurring mineral salt in rock and soil, also from some industrial wastes.
Exactly as reported
- Sulfate (secondary): 44.4 ppm (amount detected) · range 2.9–44.4 · Secondary 250 · violation: No · sampled 2025
ZincMetals0.32 ppm5 ppmSecondary2025
Your body
Zinc is an essential nutrient. EPA sets only a secondary (taste) standard for it in drinking water.
Your home & appliances
High zinc can give water a metallic taste and may point to corrosion of galvanized plumbing.
What it is
A naturally occurring metal, also released from galvanized pipes and industrial sources.
Exactly as reported
- Zinc (secondary): 0.32 ppm (amount detected) · range 0.31–0.32 · Secondary 5 · violation: No · sampled 2025
Volatile organic compoundsIndustrial & farm chemicalsChloromethane 2.34 · Bromomethane 0.61 ppbNo federal limit2022–2025
Your body
Health effects vary by chemical. EPA lists the regulated VOCs and their health effects in its national drinking water regulations table.
Your home & appliances
VOCs generally do not affect plumbing. Some can be inhaled during showering.
What it is
Carbon-based chemicals that evaporate easily, from fuels, solvents, industrial processes, and some disinfection reactions. Several are regulated; others are monitored as unregulated.
Exactly as reported
- Chloromethane (2025), Bromomethane (2022) (unregulated): Chloromethane 2.34 · Bromomethane 0.61 ppb (amount detected) · range 1.79–2.34 (chloromethane) · sampled 2022–2025
HardnessMineralsCalcium 39.7 (printed as ppb) · Magnesium 8.4 ppm as printedNo federal limit2025
Your body
Hard water is not considered a health risk. Calcium and magnesium are common dietary minerals.
Your home & appliances
Hard water leaves scale inside water heaters, dishwashers, coffee makers, and pipes, which can reduce efficiency and shorten equipment life. It also leaves spots on glass, crust on faucets and showerheads, and makes soap lather poorly.
What it is
Hardness is the amount of dissolved calcium and magnesium in water, picked up as water moves through limestone and other rock.
Exactly as reported
- Calcium and Magnesium (unregulated): Calcium 39.7 (printed as ppb) · Magnesium 8.4 ppm as printed (amount detected) · range Calcium 6.0–39.7 · Magnesium 0.02–8.4 · sampled 2025Note: Calcium and magnesium are the minerals that make water hard. Units shown as printed.
SodiumMinerals25.7 ppmNo federal limit2025
Your body
Sodium in water is a small part of most people’s daily intake. People on sodium-restricted diets may want to talk to their doctor; EPA guidance mentions 20 mg/L for people on very low-sodium diets.
Your home & appliances
Sodium itself does not usually affect plumbing.
What it is
A naturally occurring element in groundwater. It also comes from road salt, some water treatment chemicals, and water softeners.
Exactly as reported
- Sodium (unregulated): 25.7 ppm (amount detected) · range 1.4–25.7 · sampled 2025
PotassiumMinerals2.8 ppmNo federal limit2025
Your body
Potassium at drinking-water levels is a very small part of normal dietary intake. There is no federal drinking water limit.
Your home & appliances
Potassium does not affect plumbing.
What it is
A naturally occurring mineral and essential nutrient, sometimes reported as an unregulated substance.
Exactly as reported
- Potassium (unregulated): 2.8 ppm (amount detected) · range 0.87–2.8 · sampled 2025
Source: City of Frederick, Annual Water Quality Report (Reporting Year 2025) (published 2026, covering 2025), via the Maryland Department of the Environment. Values appear as printed. Detected doesn't mean unsafe; most results are below federal limits.
Wicomico · Public water system
City of Salisbury
LeadMetalsZero ppb15 ppbAction level7/16/2024
Your body
EPA has set a health goal of zero for lead because no safe level of exposure is known. In children, low-level lead exposure has been linked to lower IQ, learning and attention problems; in adults, to raised blood pressure and kidney effects. Pregnant women and young children are most at risk.
Your home & appliances
Lead itself does not damage plumbing, but its presence is a sign of corrosion: water chemistry that dissolves metal from pipes, solder, and fixtures.
What it is
A metal that usually gets into tap water from lead service lines, lead solder, and older brass fixtures inside buildings, not from the water source itself. Homes built before 1986 are more likely to have lead plumbing.
Exactly as reported
- Lead 90th %: Zero ppb (90th percentile) · Action level 15 ppb · health goal Zero · violation: NO · sampled 7/16/2024
PFASIndustrial & farm chemicals · 6 results6.875 ppt (ng/L) +5 more4 pptMCL2023
Your body
Exposure to certain PFAS, such as PFOA and PFOS, has been linked to effects including changes in cholesterol, reduced vaccine response in children, lower birth weight, and increased risk of some cancers (EPA; Fenton et al., 2021). In 2024, EPA set drinking water limits for several PFAS.
Your home & appliances
PFAS do not affect plumbing or appliances.
What it is
Per- and polyfluoroalkyl substances are a large family of man-made chemicals used since the 1940s in non-stick, stain- and water-resistant products and firefighting foams. They break down very slowly in the environment and the body.
Exactly as reported
- PFOS: 6.875 ppt (ng/L) (average) · range ND–20 · MCL 4 · health goal zero · violation: NO · sampled 2023
- PFOA: 1.475 ppt (ng/L) (average) · range ND–5.9 · MCL 4 · health goal zero · violation: NO · sampled 2023
- PFHxS: 2.35 ppt (ng/L) (average) · range ND–6.2 · MCL 10 · health goal 10 · violation: NO · sampled 2023
- PFBS: 2.575 ppt (ng/L) (average) · range ND–6.2 · limit 10 · health goal 10 · violation: NO · sampled 2023Note: The report lists this under detected unregulated contaminants. PFBS has no individual federal MCL.
- PFHxA: 2.0 ppt (ng/L) (average) · range ND–4.1 · limit 10 · health goal 10 · violation: NO · sampled 2023Note: The report lists this under detected unregulated contaminants. PFHxA has no federal MCL.
- PFPeA (printed as PFPPeA): 1.9 ppt (ng/L) (average) · range ND–3.8 · limit 10 · health goal 10 · violation: NO · sampled 2023Note: The report lists this under detected unregulated contaminants. PFPeA has no federal MCL.
NitrateNutrients · 2 results5.9 ppm +1 more10 ppmMCL2025
Your body
According to EPA, infants under six months who drink water with nitrate above the federal limit could become seriously ill (blue baby syndrome). Research has also examined links between long-term exposure and other health effects.
Your home & appliances
Nitrate does not harm plumbing. It can indicate that surface water or septic waste is reaching a well.
What it is
A form of nitrogen from fertilizer, manure, and septic systems that can soak into groundwater. It is a common concern in farming areas, including much of the Eastern Shore.
Exactly as reported
- Nitrate (as Nitrogen): 5.9 ppm (highest level found) · range 3.3–5.9 · MCL 10 · health goal 10 · violation: NO · sampled 2025
- Nitrate (as Nitrite): 5.1 ppm (level found) · MCL 10 · health goal 10 · violation: NO · sampled 2024Note: Name and values shown as printed in the report.
- From the report: The report notes that the water supply is susceptible to contamination by nitrate.
Total TrihalomethanesDisinfection byproducts · 2 results0.00062 mg/L +1 more0.1 mg/LMCL2023
Your body
According to EPA, long-term exposure above the federal limit has been linked to liver, kidney, or central nervous system problems and an increased risk of cancer. Studies have associated long-term exposure to chlorination byproducts with bladder cancer.
Your home & appliances
Trihalomethanes do not affect plumbing. They can also be inhaled during hot showers.
What it is
A group of four chemicals (chloroform, bromodichloromethane, dibromochloromethane, bromoform) that form when chlorine reacts with natural organic matter in water. Levels are usually higher at the far ends of a distribution system and in warm months.
Exactly as reported
- Dibromochloromethane: 0.00062 mg/L (level found) · MCL 0.1 · health goal 0.06 · violation: NO · sampled 2023Note: Dibromochloromethane is one of the four trihalomethanes regulated together as TTHM. Values shown as printed.
- TTHM (Total Trihalomethanes): 3.0 ppb (locational running annual average) · range 0–4.4 · MCL 80 · health goal Zero · violation: NO · sampled Quarterly/2025
Haloacetic AcidsDisinfection byproducts3.0 ppb60 ppbMCLQuarterly/2025
Your body
According to EPA, long-term exposure above the federal limit has been linked to an increased risk of cancer.
Your home & appliances
Haloacetic acids do not affect plumbing.
What it is
Five related chemicals that form when chlorine reacts with natural organic matter in water. Like TTHM, they are tracked at points around the distribution system.
Exactly as reported
- HAA5 (Haloacetic Acids): 3.0 ppb (locational running annual average) · range 0–17.0 · MCL 60 · health goal Zero · violation: NO · sampled Quarterly/2025
Beta/photon emittersRadiological4.9–6.9 pCi/L50 pCi/LMCL2021
Your body
According to EPA, long-term exposure above the federal limit has been linked to an increased risk of cancer.
Your home & appliances
Beta emitters do not affect plumbing.
What it is
A screening measurement of beta radiation in water, from natural minerals (like potassium-40) and some human-made sources. Water systems compare results to a 50 pCi/L screening level.
Exactly as reported
- Beta/photon emitters: 4.9–6.9 pCi/L (range) · MCL 50 · health goal Zero · violation: NO · sampled 2021
CopperMetals.10 ppm1.3 ppmAction level7/16/2024
Your body
According to EPA, short-term exposure above the action level has been linked to stomach and intestinal upset. Long-term exposure has been linked to liver or kidney damage, and people with Wilson’s disease are more sensitive.
Your home & appliances
Copper in water points to pipe corrosion, which can lead to pinhole leaks over time. It also leaves blue-green stains on sinks, tubs, and fixtures.
What it is
A metal that mostly enters tap water from corrosion of copper pipes and brass fixtures, especially when water is acidic (low pH) or sits in pipes for hours.
Exactly as reported
- Copper 90th %: .10 ppm (90th percentile) · Action level 1.3 ppm · health goal 1.3 · violation: NO · sampled 7/16/2024
FluorideMinerals0.27–0.42 ppm4 ppmMCL2025
Your body
EPA sets an enforceable limit of 4.0 mg/L and a secondary standard of 2.0 mg/L. According to EPA, long-term exposure above 4.0 mg/L has been linked to bone disease, and children exposed above 2.0 mg/L may develop dental fluorosis (tooth discoloration or pitting). A 2024 federal NTP review examined fluoride exposure above 1.5 mg/L and children’s IQ.
Your home & appliances
Fluoride does not affect plumbing.
What it is
A mineral that occurs naturally in some groundwater and that many public water systems add at low levels to help prevent tooth decay.
Exactly as reported
- Fluoride: 0.27–0.42 ppm (level found) · MCL 4 · health goal 4 · violation: NO · sampled 2025
ChlorineDisinfectants1.0 ppm4.0 ppmMax. disinfectant2025
Your body
According to EPA, people drinking water containing chlorine well in excess of the federal limit could experience eye or nose irritation or stomach discomfort. Disinfection itself is an important public health protection.
Your home & appliances
Chlorine causes the “pool” taste and smell many people notice. Over time it can dry out rubber seals and gaskets in fixtures and appliances.
What it is
Public water systems are required to disinfect water to control germs, and most use chlorine or chloramine. A small amount stays in the water all the way to your tap.
Exactly as reported
- Chlorine: 1.0 ppm (level found) · range 1.0–1.0 · Max. disinfectant 4.0 · health goal 4 · violation: NO · sampled 2025
BariumMetals0.170 ppm2 ppmMCL2025
Your body
According to EPA, long-term exposure above the federal limit has been linked to increased blood pressure.
Your home & appliances
Barium can add to the mineral scale that builds up in water heaters and pipes.
What it is
A naturally occurring metal found in many rock formations, plus discharges from drilling and metal refining.
Exactly as reported
- Barium: 0.170 ppm (level found) · MCL 2 · health goal 2 · violation: NO · sampled 2025
AsbestosIndustrial & farm chemicals0.19 MFL (million fibers per liter)7 MFLMCL2024
Your body
According to EPA, long-term exposure above the federal limit has been linked to an increased risk of developing benign intestinal polyps.
Your home & appliances
Fibers in water indicate wear in asbestos-cement water mains. They do not affect household plumbing.
What it is
Mineral fibers that can enter water from aging asbestos-cement water mains or natural deposits. Measured in million fibers per liter (MFL).
Exactly as reported
- Asbestos: 0.19 MFL (million fibers per liter) (level found) · MCL 7 · health goal 7 · violation: NO · sampled 2024
Source: City of Salisbury, 2025 Water Quality Report (published 2026, covering 2025), via the Maryland Department of the Environment. Values appear as printed. Detected doesn't mean unsafe; most results are below federal limits.
Talbot · Public water system
Easton Utilities
LeadMetals2.1 ppb15 ppbAction level2021–2023
Your body
EPA has set a health goal of zero for lead because no safe level of exposure is known. In children, low-level lead exposure has been linked to lower IQ, learning and attention problems; in adults, to raised blood pressure and kidney effects. Pregnant women and young children are most at risk.
Your home & appliances
Lead itself does not damage plumbing, but its presence is a sign of corrosion: water chemistry that dissolves metal from pipes, solder, and fixtures.
What it is
A metal that usually gets into tap water from lead service lines, lead solder, and older brass fixtures inside buildings, not from the water source itself. Homes built before 1986 are more likely to have lead plumbing.
Exactly as reported
- Lead: 2.1 ppb (90th percentile) · range ND(<1)–6.9 · Action level 15 · health goal 0 · violation: NO · sampled 2021–2023
Total TrihalomethanesDisinfection byproducts9 ppb80 ppbMCL2025
Your body
According to EPA, long-term exposure above the federal limit has been linked to liver, kidney, or central nervous system problems and an increased risk of cancer. Studies have associated long-term exposure to chlorination byproducts with bladder cancer.
Your home & appliances
Trihalomethanes do not affect plumbing. They can also be inhaled during hot showers.
What it is
A group of four chemicals (chloroform, bromodichloromethane, dibromochloromethane, bromoform) that form when chlorine reacts with natural organic matter in water. Levels are usually higher at the far ends of a distribution system and in warm months.
Exactly as reported
- Total Trihalomethanes (TTHM): 9 ppb (highest locational running annual average) · range 0–11.7 · MCL 80 · health goal 0 · violation: NO · sampled 2025
Haloacetic AcidsDisinfection byproducts2 ppb60 ppbMCL2025
Your body
According to EPA, long-term exposure above the federal limit has been linked to an increased risk of cancer.
Your home & appliances
Haloacetic acids do not affect plumbing.
What it is
Five related chemicals that form when chlorine reacts with natural organic matter in water. Like TTHM, they are tracked at points around the distribution system.
Exactly as reported
- Total Haloacetic Acids (HAA5): 2 ppb (highest locational running annual average) · range 0–2.1 · MCL 60 · health goal 0 · violation: NO · sampled 2025
Beta/photon emittersRadiological6.1 pCi/L50 pCi/LMCL4/30/2025
Your body
According to EPA, long-term exposure above the federal limit has been linked to an increased risk of cancer.
Your home & appliances
Beta emitters do not affect plumbing.
What it is
A screening measurement of beta radiation in water, from natural minerals (like potassium-40) and some human-made sources. Water systems compare results to a 50 pCi/L screening level.
Exactly as reported
- Gross Beta Particle Activity: 6.1 pCi/L (highest value) · range 6.1 · MCL 50 · health goal 0 · violation: NO · sampled 4/30/2025
CopperMetals0.27 ppm1.3 ppmAction level2021–2023
Your body
According to EPA, short-term exposure above the action level has been linked to stomach and intestinal upset. Long-term exposure has been linked to liver or kidney damage, and people with Wilson’s disease are more sensitive.
Your home & appliances
Copper in water points to pipe corrosion, which can lead to pinhole leaks over time. It also leaves blue-green stains on sinks, tubs, and fixtures.
What it is
A metal that mostly enters tap water from corrosion of copper pipes and brass fixtures, especially when water is acidic (low pH) or sits in pipes for hours.
Exactly as reported
- Copper, Free: 0.27 ppm (90th percentile) · range ND(<0.05)–0.37 · Action level 1.3 · health goal 1.3 · violation: NO · sampled 2021–2023
FluorideMinerals2.3 ppm4 ppmMCL7/25/2024
Your body
EPA sets an enforceable limit of 4.0 mg/L and a secondary standard of 2.0 mg/L. According to EPA, long-term exposure above 4.0 mg/L has been linked to bone disease, and children exposed above 2.0 mg/L may develop dental fluorosis (tooth discoloration or pitting). A 2024 federal NTP review examined fluoride exposure above 1.5 mg/L and children’s IQ.
Your home & appliances
Fluoride does not affect plumbing.
What it is
A mineral that occurs naturally in some groundwater and that many public water systems add at low levels to help prevent tooth decay.
Exactly as reported
- Fluoride: 2.3 ppm (highest value) · range 0.4–2.3 · MCL 4 · health goal 4 · violation: NO · sampled 7/25/2024
- From the report: Easton Utilities does not add fluoride. Some wells have naturally occurring fluoride, and the report includes a required notice that the system's fluoride concentration is greater than 2.0 mg/L. It advises that children under nine be given alternative drinking water or water treated to remove fluoride, to avoid possible staining and pitting of permanent teeth.
ChlorineDisinfectants0.8 ppm4 ppmMax. disinfectant2025
Your body
According to EPA, people drinking water containing chlorine well in excess of the federal limit could experience eye or nose irritation or stomach discomfort. Disinfection itself is an important public health protection.
Your home & appliances
Chlorine causes the “pool” taste and smell many people notice. Over time it can dry out rubber seals and gaskets in fixtures and appliances.
What it is
Public water systems are required to disinfect water to control germs, and most use chlorine or chloramine. A small amount stays in the water all the way to your tap.
Exactly as reported
- Chlorine: 0.8 ppm (highest running annual average) · range 0.1–1 · Max. disinfectant 4 · health goal 4 · violation: NO · sampled 2025
BariumMetals0.0587 ppm2 ppmMCL7/10/2025
Your body
According to EPA, long-term exposure above the federal limit has been linked to increased blood pressure.
Your home & appliances
Barium can add to the mineral scale that builds up in water heaters and pipes.
What it is
A naturally occurring metal found in many rock formations, plus discharges from drilling and metal refining.
Exactly as reported
- Barium: 0.0587 ppm (highest value) · range 0.0126–0.0587 · MCL 2 · health goal 2 · violation: NO · sampled 7/10/2025
ChromiumMetals9.7 ppb100 ppbMCL7/10/2025
Your body
According to EPA, long-term exposure above the federal limit has been linked to allergic dermatitis. Chromium-6 is the more toxic form and is under ongoing EPA review.
Your home & appliances
At drinking-water levels, chromium does not usually affect plumbing or appliances.
What it is
A metal found naturally in rocks and soil and released by steel, pulp, and other industries. Water reports usually list “total chromium,” which includes chromium-3 and chromium-6.
Exactly as reported
- Chromium: 9.7 ppb (highest value) · range 2–9.7 · MCL 100 · health goal 100 · violation: NO · sampled 7/10/2025
- Iron: The report says Wells No. 11 and 12 have elevated naturally occurring iron, which is treated and filtered. It states the average iron level after treatment is less than 0.10 mg/L.
- Sodium: The report states that Easton's water has a sodium content exceeding 20 parts per million, and advises people on sodium-restricted diets to tell their physician.
- Hardness: The report states that Easton's water hardness is less than 50 ppm and is considered soft.
- PFAS: The report states that PFOA and PFOS were not detected in 2021 or 2023 sampling.
Source: Easton Utilities, 2026 Water Quality Report (published 2026, covering 2025), via the Maryland Department of the Environment. Values appear as printed. Detected doesn't mean unsafe; most results are below federal limits.
Harford · Public water system
Harford County Department of Public Works
LeadMetals<1.0 ppb15 ppbAction level2023
Your body
EPA has set a health goal of zero for lead because no safe level of exposure is known. In children, low-level lead exposure has been linked to lower IQ, learning and attention problems; in adults, to raised blood pressure and kidney effects. Pregnant women and young children are most at risk.
Your home & appliances
Lead itself does not damage plumbing, but its presence is a sign of corrosion: water chemistry that dissolves metal from pipes, solder, and fixtures.
What it is
A metal that usually gets into tap water from lead service lines, lead solder, and older brass fixtures inside buildings, not from the water source itself. Homes built before 1986 are more likely to have lead plumbing.
Exactly as reported
- Lead: <1.0 ppb (90th percentile) · range ND–5.0 · Action level 15 · violation: No · sampled 2023
PFASIndustrial & farm chemicals0.2 pptNo federal limit2025
Your body
Exposure to certain PFAS, such as PFOA and PFOS, has been linked to effects including changes in cholesterol, reduced vaccine response in children, lower birth weight, and increased risk of some cancers (EPA; Fenton et al., 2021). In 2024, EPA set drinking water limits for several PFAS.
Your home & appliances
PFAS do not affect plumbing or appliances.
What it is
Per- and polyfluoroalkyl substances are a large family of man-made chemicals used since the 1940s in non-stick, stain- and water-resistant products and firefighting foams. They break down very slowly in the environment and the body.
Exactly as reported
- PFHxA (unregulated): 0.2 ppt (average) · range ND–0.9 · sampled 2025
NitrateNutrients3.87 ppm10 ppmMCL2025
Your body
According to EPA, infants under six months who drink water with nitrate above the federal limit could become seriously ill (blue baby syndrome). Research has also examined links between long-term exposure and other health effects.
Your home & appliances
Nitrate does not harm plumbing. It can indicate that surface water or septic waste is reaching a well.
What it is
A form of nitrogen from fertilizer, manure, and septic systems that can soak into groundwater. It is a common concern in farming areas, including much of the Eastern Shore.
Exactly as reported
- Nitrate (ppm of Nitrogen): 3.87 ppm (highest level) · range 1.42–3.87 · MCL 10 · health goal 10 · violation: No · sampled 2025
Total TrihalomethanesDisinfection byproducts38.1 ppb80 ppbMCL2025
Your body
According to EPA, long-term exposure above the federal limit has been linked to liver, kidney, or central nervous system problems and an increased risk of cancer. Studies have associated long-term exposure to chlorination byproducts with bladder cancer.
Your home & appliances
Trihalomethanes do not affect plumbing. They can also be inhaled during hot showers.
What it is
A group of four chemicals (chloroform, bromodichloromethane, dibromochloromethane, bromoform) that form when chlorine reacts with natural organic matter in water. Levels are usually higher at the far ends of a distribution system and in warm months.
Exactly as reported
- Total Trihalomethanes (TTHMs): 38.1 ppb (highest locational running annual average) · range 8.2–61.0 · MCL 80 · health goal N/A · violation: No · sampled 2025
Haloacetic AcidsDisinfection byproducts26.8 ppb60 ppbMCL2025
Your body
According to EPA, long-term exposure above the federal limit has been linked to an increased risk of cancer.
Your home & appliances
Haloacetic acids do not affect plumbing.
What it is
Five related chemicals that form when chlorine reacts with natural organic matter in water. Like TTHM, they are tracked at points around the distribution system.
Exactly as reported
- Haloacetic Acids (HAA5): 26.8 ppb (highest locational running annual average) · range 6.0–41.4 · MCL 60 · health goal N/A · violation: No · sampled 2025
RadiumRadiological1.1 pCi/L5 pCi/LMCL2025
Your body
According to EPA, long-term exposure above the federal limit has been linked to an increased risk of cancer.
Your home & appliances
Radium does not affect plumbing, but it can build up in softener resin and filter media.
What it is
A naturally occurring radioactive element in some rock and soil, found in certain Maryland aquifers. Reports list radium-226, radium-228, or the two combined.
Exactly as reported
- Combined Radium (226 & 228): 1.1 pCi/L (level detected) · MCL 5 · health goal 0 · violation: No · sampled 2025
Gross alpha activityRadiological4.9 pCi/L15 pCi/LMCL2025
Your body
According to EPA, long-term exposure above the federal limit has been linked to an increased risk of cancer.
Your home & appliances
Alpha emitters do not affect plumbing.
What it is
A screening measurement of total alpha radiation in water, mostly from natural uranium, radium, and related elements in rock.
Exactly as reported
- Gross Alpha: 4.9 pCi/L (level detected) · MCL 15 · health goal 0 · violation: No · sampled 2025
Beta/photon emittersRadiological4.2 pCi/L50 pCi/LMCL2025
Your body
According to EPA, long-term exposure above the federal limit has been linked to an increased risk of cancer.
Your home & appliances
Beta emitters do not affect plumbing.
What it is
A screening measurement of beta radiation in water, from natural minerals (like potassium-40) and some human-made sources. Water systems compare results to a 50 pCi/L screening level.
Exactly as reported
- Gross Beta Particles: 4.2 pCi/L (level detected) · MCL 50 · health goal 0 · violation: No · sampled 2025
Coliform bacteria & E. coliMicrobes0.8% % of monthly samples5% positive/monthMCL2025
Your body
According to EPA, germs indicated by E. coli can cause stomach cramps, diarrhea, nausea, and headaches, and may pose a special risk for infants, young children, and people with severely compromised immune systems.
Your home & appliances
Bacteria do not damage plumbing, but in wells they can point to a cracked well cap, a damaged casing, or nearby septic issues.
What it is
Coliforms are bacteria that are common in the environment. Water systems test for them as an indicator: their presence means germs may be able to get into the water. E. coli is a specific type that indicates fecal contamination.
Exactly as reported
- Total Coliform: 0.8% % of monthly samples (highest % positive per month) · range 0%–0.8% · MCL 5% positive/month · health goal 0% · violation: No · sampled 2025
CopperMetals0.37 ppm1.3 ppmAction level2023
Your body
According to EPA, short-term exposure above the action level has been linked to stomach and intestinal upset. Long-term exposure has been linked to liver or kidney damage, and people with Wilson’s disease are more sensitive.
Your home & appliances
Copper in water points to pipe corrosion, which can lead to pinhole leaks over time. It also leaves blue-green stains on sinks, tubs, and fixtures.
What it is
A metal that mostly enters tap water from corrosion of copper pipes and brass fixtures, especially when water is acidic (low pH) or sits in pipes for hours.
Exactly as reported
- Copper: 0.37 ppm (90th percentile) · range 0.136–0.565 · Action level 1.3 · violation: No · sampled 2023
FluorideMinerals0.66 ppm4 ppmMCL2025
Your body
EPA sets an enforceable limit of 4.0 mg/L and a secondary standard of 2.0 mg/L. According to EPA, long-term exposure above 4.0 mg/L has been linked to bone disease, and children exposed above 2.0 mg/L may develop dental fluorosis (tooth discoloration or pitting). A 2024 federal NTP review examined fluoride exposure above 1.5 mg/L and children’s IQ.
Your home & appliances
Fluoride does not affect plumbing.
What it is
A mineral that occurs naturally in some groundwater and that many public water systems add at low levels to help prevent tooth decay.
Exactly as reported
- Fluoride: 0.66 ppm (highest level (average 0.47)) · range ND–0.66 · MCL 4 · health goal 4 · violation: No · sampled 2025
ChlorineDisinfectants2.4 ppm4 ppmMax. disinfectant2025
Your body
According to EPA, people drinking water containing chlorine well in excess of the federal limit could experience eye or nose irritation or stomach discomfort. Disinfection itself is an important public health protection.
Your home & appliances
Chlorine causes the “pool” taste and smell many people notice. Over time it can dry out rubber seals and gaskets in fixtures and appliances.
What it is
Public water systems are required to disinfect water to control germs, and most use chlorine or chloramine. A small amount stays in the water all the way to your tap.
Exactly as reported
- Chlorine: 2.4 ppm (highest level (average 1.63)) · range 0.3–2.4 · Max. disinfectant 4 · health goal 4 · violation: No · sampled 2025
BariumMetals0.12 ppm2 ppmMCL2025
Your body
According to EPA, long-term exposure above the federal limit has been linked to increased blood pressure.
Your home & appliances
Barium can add to the mineral scale that builds up in water heaters and pipes.
What it is
A naturally occurring metal found in many rock formations, plus discharges from drilling and metal refining.
Exactly as reported
- Barium: 0.12 ppm (highest level) · range 0.03–0.12 · MCL 2 · health goal 2 · violation: No · sampled 2025
TurbidityWater quality0.097 NTUTT ≤ 0.3 in 95% of samples/month; never > 1.0 NTUMCL2025
Your body
Turbidity itself has no health effects, but according to EPA, it can interfere with disinfection and give germs a place to grow.
Your home & appliances
Sediment that causes cloudy water can clog faucet aerators, valves, and appliance inlets.
What it is
Turbidity measures how cloudy water is, from suspended particles like silt and clay. Water systems monitor it to show how well their filtration works.
Exactly as reported
- Turbidity: 0.097 NTU (highest (average 0.033)) · range 0.017–0.097 · MCL TT ≤ 0.3 in 95% of samples/month; never > 1.0 · violation: No · sampled 2025
ManganeseMinerals0.023 ppmNo federal limit2025
Your body
Manganese is a nutrient in small amounts. At higher levels in drinking water, it has been linked in some studies to effects on children’s learning and behavior. EPA has a health advisory level in addition to its cosmetic standard.
Your home & appliances
Manganese causes black or brown stains on fixtures and laundry, a bitter taste, and black sediment in pipes and water heaters.
What it is
A naturally occurring mineral often found with iron in groundwater.
Exactly as reported
- Manganese (unregulated): 0.023 ppm (average) · range 0.022–0.024 · sampled 2025
NickelMetals0.004 ppmNo federal limit2025
Your body
The most common health effect of nickel is an allergic skin reaction in sensitive people. Some water systems still monitor nickel, but it does not currently have an enforceable federal drinking water limit.
Your home & appliances
Nickel can be a sign of corrosion in metal plumbing components.
What it is
A metal found naturally in soil and rock, which can also leach from some metal pipes and fittings.
Exactly as reported
- Nickel (unregulated): 0.004 ppm (average) · range ND–0.006 · sampled 2025
SodiumMinerals50.3 ppmNo federal limit2025
Your body
Sodium in water is a small part of most people’s daily intake. People on sodium-restricted diets may want to talk to their doctor; EPA guidance mentions 20 mg/L for people on very low-sodium diets.
Your home & appliances
Sodium itself does not usually affect plumbing.
What it is
A naturally occurring element in groundwater. It also comes from road salt, some water treatment chemicals, and water softeners.
Exactly as reported
- Sodium (unregulated): 50.3 ppm (average) · range 30.5–83.5 · sampled 2025
Source: Harford County Department of Public Works, 2025 Harford County Water Quality Report (published 2026, covering 2025), via the Maryland Department of the Environment. Values appear as printed. Detected doesn't mean unsafe; most results are below federal limits.
Howard · Public water system
Howard County Department of Public Works
LeadMetals4 ppb15 ppbAction level2023
Your body
EPA has set a health goal of zero for lead because no safe level of exposure is known. In children, low-level lead exposure has been linked to lower IQ, learning and attention problems; in adults, to raised blood pressure and kidney effects. Pregnant women and young children are most at risk.
Your home & appliances
Lead itself does not damage plumbing, but its presence is a sign of corrosion: water chemistry that dissolves metal from pipes, solder, and fixtures.
What it is
A metal that usually gets into tap water from lead service lines, lead solder, and older brass fixtures inside buildings, not from the water source itself. Homes built before 1986 are more likely to have lead plumbing.
Exactly as reported
- Lead: 4 ppb (90th percentile) · range ND–6.6 · Action level 15 · health goal 0 · violation: No · sampled 2023
PFASIndustrial & farm chemicals · 5 resultsAshburton 2.94 · Patuxent 1.8 · Montebello 1.88 ppt +4 more4 pptMCL2025
Your body
Exposure to certain PFAS, such as PFOA and PFOS, has been linked to effects including changes in cholesterol, reduced vaccine response in children, lower birth weight, and increased risk of some cancers (EPA; Fenton et al., 2021). In 2024, EPA set drinking water limits for several PFAS.
Your home & appliances
PFAS do not affect plumbing or appliances.
What it is
Per- and polyfluoroalkyl substances are a large family of man-made chemicals used since the 1940s in non-stick, stain- and water-resistant products and firefighting foams. They break down very slowly in the environment and the body.
Exactly as reported
- Perfluorooctanoic Acid [PFOA]: Ashburton 2.94 · Patuxent 1.8 · Montebello 1.88 ppt (amount detected by supply) · MCL 4 · health goal 0 · violation: No · sampled 2025
- Perfluorooctanesulfonic Acid [PFOS]: Ashburton 3.33 · Patuxent 1.8 · Montebello 1.68 ppt (amount detected by supply) · MCL 4 · health goal 0 · violation: No · sampled 2025
- Perfluorohexanesulfonic Acid [PFHxS]: Ashburton ND · Patuxent 1.6 · Montebello ND ppt (amount detected by supply) · MCL 10 · health goal 10 · violation: No · sampled 2025
- Perfluorobutanesulfonic Acid [PFBS]: Ashburton 1.75 · Patuxent 2 · Montebello 2.21 ppt (amount detected by supply) · violation: No · sampled 2025
- PFHxA, PFBA, PFPeA, PFHpA (unregulated): PFHxA: Ashburton 2.9 · Patuxent 1.9 · Montebello 2.08. PFBA 2.5, PFPeA 2.3, PFHpA 0.6 (Patuxent) ppt (amount detected by supply) · sampled 2025
NitrateNutrientsAshburton 5.81 · Patuxent 1.4 · Montebello 1.57 ppm10 ppmMCL2025
Your body
According to EPA, infants under six months who drink water with nitrate above the federal limit could become seriously ill (blue baby syndrome). Research has also examined links between long-term exposure and other health effects.
Your home & appliances
Nitrate does not harm plumbing. It can indicate that surface water or septic waste is reaching a well.
What it is
A form of nitrogen from fertilizer, manure, and septic systems that can soak into groundwater. It is a common concern in farming areas, including much of the Eastern Shore.
Exactly as reported
- Nitrate: Ashburton 5.81 · Patuxent 1.4 · Montebello 1.57 ppm (amount detected by supply) · range 0.4–5.81 · MCL 10 · health goal 10 · violation: No · sampled 2025
Total TrihalomethanesDisinfection byproducts68 ppb80 ppbMCL2025
Your body
According to EPA, long-term exposure above the federal limit has been linked to liver, kidney, or central nervous system problems and an increased risk of cancer. Studies have associated long-term exposure to chlorination byproducts with bladder cancer.
Your home & appliances
Trihalomethanes do not affect plumbing. They can also be inhaled during hot showers.
What it is
A group of four chemicals (chloroform, bromodichloromethane, dibromochloromethane, bromoform) that form when chlorine reacts with natural organic matter in water. Levels are usually higher at the far ends of a distribution system and in warm months.
Exactly as reported
- Total Trihalomethanes [TTHMs]: 68 ppb (amount detected (howard county)) · range 23–115 · MCL 80 · health goal NA · violation: No · sampled 2025
Haloacetic AcidsDisinfection byproducts31 ppb60 ppbMCL2025
Your body
According to EPA, long-term exposure above the federal limit has been linked to an increased risk of cancer.
Your home & appliances
Haloacetic acids do not affect plumbing.
What it is
Five related chemicals that form when chlorine reacts with natural organic matter in water. Like TTHM, they are tracked at points around the distribution system.
Exactly as reported
- Haloacetic Acids [HAA5]: 31 ppb (amount detected (howard county)) · range ND–32 · MCL 60 · health goal NA · violation: No · sampled 2025
RadiumRadiological0.1 pCi/L5 pCi/LMCL2025
Your body
According to EPA, long-term exposure above the federal limit has been linked to an increased risk of cancer.
Your home & appliances
Radium does not affect plumbing, but it can build up in softener resin and filter media.
What it is
A naturally occurring radioactive element in some rock and soil, found in certain Maryland aquifers. Reports list radium-226, radium-228, or the two combined.
Exactly as reported
- Radium 228: 0.1 pCi/L (amount detected (patuxent supply)) · range 0.1–0.2 · MCL 5 · health goal 0 · violation: No · sampled 2025
Beta/photon emittersRadiological4.4 pCi/L50 pCi/LMCL2025
Your body
According to EPA, long-term exposure above the federal limit has been linked to an increased risk of cancer.
Your home & appliances
Beta emitters do not affect plumbing.
What it is
A screening measurement of beta radiation in water, from natural minerals (like potassium-40) and some human-made sources. Water systems compare results to a 50 pCi/L screening level.
Exactly as reported
- Beta/Photon Emitters: 4.4 pCi/L (amount detected (patuxent supply)) · range ND–4.4 · MCL 50 · health goal 0 · violation: No · sampled 2025
CopperMetals0.1 ppm1.3 ppmAction level2023
Your body
According to EPA, short-term exposure above the action level has been linked to stomach and intestinal upset. Long-term exposure has been linked to liver or kidney damage, and people with Wilson’s disease are more sensitive.
Your home & appliances
Copper in water points to pipe corrosion, which can lead to pinhole leaks over time. It also leaves blue-green stains on sinks, tubs, and fixtures.
What it is
A metal that mostly enters tap water from corrosion of copper pipes and brass fixtures, especially when water is acidic (low pH) or sits in pipes for hours.
Exactly as reported
- Copper: 0.1 ppm (90th percentile) · range 0.001–0.2 · Action level 1.3 · health goal 1.3 · violation: No · sampled 2023
FluorideMineralsAshburton 0.90 · Patuxent 0.9 · Montebello 1.09 ppm4 ppmMCL2025
Your body
EPA sets an enforceable limit of 4.0 mg/L and a secondary standard of 2.0 mg/L. According to EPA, long-term exposure above 4.0 mg/L has been linked to bone disease, and children exposed above 2.0 mg/L may develop dental fluorosis (tooth discoloration or pitting). A 2024 federal NTP review examined fluoride exposure above 1.5 mg/L and children’s IQ.
Your home & appliances
Fluoride does not affect plumbing.
What it is
A mineral that occurs naturally in some groundwater and that many public water systems add at low levels to help prevent tooth decay.
Exactly as reported
- Fluoride: Ashburton 0.90 · Patuxent 0.9 · Montebello 1.09 ppm (amount detected by supply) · range 0.07–1.09 · MCL 4 · health goal 4 · violation: No · sampled 2025
ChlorineDisinfectants0.45 ppm4 ppmMax. disinfectant2025
Your body
According to EPA, people drinking water containing chlorine well in excess of the federal limit could experience eye or nose irritation or stomach discomfort. Disinfection itself is an important public health protection.
Your home & appliances
Chlorine causes the “pool” taste and smell many people notice. Over time it can dry out rubber seals and gaskets in fixtures and appliances.
What it is
Public water systems are required to disinfect water to control germs, and most use chlorine or chloramine. A small amount stays in the water all the way to your tap.
Exactly as reported
- Chlorine: 0.45 ppm (amount detected (howard county)) · range 0.01–1.12 · Max. disinfectant 4 · health goal 4 · violation: No · sampled 2025
BariumMetalsAshburton 0.0238 · Patuxent 0.04 · Montebello 0.0407 ppm2 ppmMCL2025
Your body
According to EPA, long-term exposure above the federal limit has been linked to increased blood pressure.
Your home & appliances
Barium can add to the mineral scale that builds up in water heaters and pipes.
What it is
A naturally occurring metal found in many rock formations, plus discharges from drilling and metal refining.
Exactly as reported
- Barium: Ashburton 0.0238 · Patuxent 0.04 · Montebello 0.0407 ppm (amount detected by supply) · range 0.0199–0.0407 · MCL 2 · health goal 2 · violation: No · sampled 2025
TurbidityWater qualityAshburton 0.12 · Patuxent 0.05 · Montebello 0.22 NTUTTMCL2025
Your body
Turbidity itself has no health effects, but according to EPA, it can interfere with disinfection and give germs a place to grow.
Your home & appliances
Sediment that causes cloudy water can clog faucet aerators, valves, and appliance inlets.
What it is
Turbidity measures how cloudy water is, from suspended particles like silt and clay. Water systems monitor it to show how well their filtration works.
Exactly as reported
- Turbidity: Ashburton 0.12 · Patuxent 0.05 · Montebello 0.22 NTU (amount detected by supply) · MCL TT · violation: No · sampled 2025
AluminumMetals20 ppb200 ppbSecondary2025
Your body
EPA regulates aluminum only as a secondary (cosmetic) standard, based on color. ATSDR has more on its health effects at higher exposures.
Your home & appliances
At higher levels aluminum can cause water discoloration.
What it is
A common element in soil and rock. Small amounts can remain after some water treatment processes that use aluminum compounds to settle out particles.
Exactly as reported
- Aluminum (secondary): 20 ppb (amount detected (patuxent supply)) · range 10–40 · Secondary 200 · violation: No · sampled 2025
ChlorideMinerals43 ppm250 ppmSecondary2025
Your body
EPA regulates chloride only as a secondary (taste) standard.
Your home & appliances
High chloride gives water a salty taste and can speed up corrosion of metal pipes and water heaters.
What it is
A common salt component from natural deposits, road salt runoff, and saltwater intrusion near the coast.
Exactly as reported
- Chloride (secondary): 43 ppm (amount detected (patuxent supply)) · range 35–55 · Secondary 250 · violation: No · sampled 2025
ManganeseMinerals2 ppb50 ppbSecondary2025
Your body
Manganese is a nutrient in small amounts. At higher levels in drinking water, it has been linked in some studies to effects on children’s learning and behavior. EPA has a health advisory level in addition to its cosmetic standard.
Your home & appliances
Manganese causes black or brown stains on fixtures and laundry, a bitter taste, and black sediment in pipes and water heaters.
What it is
A naturally occurring mineral often found with iron in groundwater.
Exactly as reported
- Manganese (secondary): 2 ppb (amount detected (patuxent supply)) · range 3–8 · Secondary 50 · violation: No · sampled 2025Note: Amount and range shown exactly as printed.
SulfateMinerals5.9 ppm250 ppmSecondary2025
Your body
EPA regulates sulfate as a secondary standard. At high levels it can have a laxative effect on people not used to it.
Your home & appliances
High sulfate can give water a bitter taste and contribute to scale.
What it is
A naturally occurring mineral salt in rock and soil, also from some industrial wastes.
Exactly as reported
- Sulfate (secondary): 5.9 ppm (amount detected (patuxent supply)) · range 4.4–7.1 · Secondary 250 · violation: No · sampled 2025
HardnessMinerals70 ppmNo federal limit2025
Your body
Hard water is not considered a health risk. Calcium and magnesium are common dietary minerals.
Your home & appliances
Hard water leaves scale inside water heaters, dishwashers, coffee makers, and pipes, which can reduce efficiency and shorten equipment life. It also leaves spots on glass, crust on faucets and showerheads, and makes soap lather poorly.
What it is
Hardness is the amount of dissolved calcium and magnesium in water, picked up as water moves through limestone and other rock.
Exactly as reported
- Hardness, Total [as CaCO3] (unregulated): 70 ppm (amount detected (patuxent supply)) · range 58–86 · sampled 2025
SodiumMinerals16 ppmNo federal limit2025
Your body
Sodium in water is a small part of most people’s daily intake. People on sodium-restricted diets may want to talk to their doctor; EPA guidance mentions 20 mg/L for people on very low-sodium diets.
Your home & appliances
Sodium itself does not usually affect plumbing.
What it is
A naturally occurring element in groundwater. It also comes from road salt, some water treatment chemicals, and water softeners.
Exactly as reported
- Sodium (unregulated): 16 ppm (amount detected (patuxent supply)) · range 13–22 · sampled 2025
Taste & odor compoundsWater qualityGeosmin 2.9 · 2-MIB 2.2 pptNo federal limit2025
Your body
Geosmin and 2-MIB are considered aesthetic issues, not health risks.
Your home & appliances
They have no effect on plumbing, but they can make water and ice taste earthy.
What it is
Natural compounds made by algae and soil bacteria in rivers and reservoirs that give water an earthy or musty taste. People can notice them at a few parts per trillion.
Exactly as reported
- Geosmin and 2-Methylisoborneol (unregulated): Geosmin 2.9 · 2-MIB 2.2 ppt (amount detected (patuxent supply)) · range 2.0–9.2 · sampled 2025
Source: Howard County Department of Public Works, Annual Water Quality Report (Reporting Year 2025) (published 2026, covering 2025), via the Maryland Department of the Environment. Values appear as printed. Detected doesn't mean unsafe; most results are below federal limits.
Talbot · Public water system
Town of Oxford
LeadMetals10.4 ppb15 ppbAction level2023–2025
Your body
EPA has set a health goal of zero for lead because no safe level of exposure is known. In children, low-level lead exposure has been linked to lower IQ, learning and attention problems; in adults, to raised blood pressure and kidney effects. Pregnant women and young children are most at risk.
Your home & appliances
Lead itself does not damage plumbing, but its presence is a sign of corrosion: water chemistry that dissolves metal from pipes, solder, and fixtures.
What it is
A metal that usually gets into tap water from lead service lines, lead solder, and older brass fixtures inside buildings, not from the water source itself. Homes built before 1986 are more likely to have lead plumbing.
Exactly as reported
- Lead (distribution): 10.4 ppb (90th percentile) · range <0.005 · Action level 15 · health goal 0 · violation: N · sampled 2023–2025
ArsenicMetals9.6 ppb10 ppbMCL2025
Your body
Long-term exposure has been linked to skin changes, circulatory problems, and an increased risk of bladder, lung, and skin cancers (EPA, WHO). EPA’s health goal is zero.
Your home & appliances
Arsenic at levels found in drinking water does not usually harm plumbing or appliances.
What it is
A naturally occurring element found in some rock and soil, and in past use in pesticides and wood preservatives. It has no taste, color, or smell. Some Maryland aquifers contain natural arsenic.
Exactly as reported
- Arsenic: 9.6 ppb (highest level detected (running average)) · range 0–9.6 · MCL 10 · health goal 0 · violation: N · sampled 2025
NitrateNutrients0.0056 ppm10 ppmMCL2023
Your body
According to EPA, infants under six months who drink water with nitrate above the federal limit could become seriously ill (blue baby syndrome). Research has also examined links between long-term exposure and other health effects.
Your home & appliances
Nitrate does not harm plumbing. It can indicate that surface water or septic waste is reaching a well.
What it is
A form of nitrogen from fertilizer, manure, and septic systems that can soak into groundwater. It is a common concern in farming areas, including much of the Eastern Shore.
Exactly as reported
- Nitrate (measured as nitrogen): 0.0056 ppm (level detected) · range 0–0.0056 · MCL 10 · health goal 10 · violation: N · sampled 2023
Total TrihalomethanesDisinfection byproducts25 ppb80 ppbMCL2025
Your body
According to EPA, long-term exposure above the federal limit has been linked to liver, kidney, or central nervous system problems and an increased risk of cancer. Studies have associated long-term exposure to chlorination byproducts with bladder cancer.
Your home & appliances
Trihalomethanes do not affect plumbing. They can also be inhaled during hot showers.
What it is
A group of four chemicals (chloroform, bromodichloromethane, dibromochloromethane, bromoform) that form when chlorine reacts with natural organic matter in water. Levels are usually higher at the far ends of a distribution system and in warm months.
Exactly as reported
- TTHM [Total trihalomethanes]: 25 ppb (highest lraa) · range 25.2–25.2 · MCL 80 · health goal 0 · violation: N · sampled 2025
Haloacetic AcidsDisinfection byproducts3 ppb60 ppbMCL2024
Your body
According to EPA, long-term exposure above the federal limit has been linked to an increased risk of cancer.
Your home & appliances
Haloacetic acids do not affect plumbing.
What it is
Five related chemicals that form when chlorine reacts with natural organic matter in water. Like TTHM, they are tracked at points around the distribution system.
Exactly as reported
- HAA5 Haloacetic Acids: 3 ppb (highest lraa) · range 3.28–3.28 · MCL 60 · health goal 0 · violation: N · sampled 2024
RadiumRadiological0.2 pCi/L5 pCi/LMCL5/14/2024
Your body
According to EPA, long-term exposure above the federal limit has been linked to an increased risk of cancer.
Your home & appliances
Radium does not affect plumbing, but it can build up in softener resin and filter media.
What it is
A naturally occurring radioactive element in some rock and soil, found in certain Maryland aquifers. Reports list radium-226, radium-228, or the two combined.
Exactly as reported
- Radium-228: 0.2 pCi/L (level detected) · MCL 5 · health goal 0 · violation: N · sampled 5/14/2024
Beta/photon emittersRadiological5.4 pCi/L50 pCi/LMCL2024
Your body
According to EPA, long-term exposure above the federal limit has been linked to an increased risk of cancer.
Your home & appliances
Beta emitters do not affect plumbing.
What it is
A screening measurement of beta radiation in water, from natural minerals (like potassium-40) and some human-made sources. Water systems compare results to a 50 pCi/L screening level.
Exactly as reported
- Gross Beta Particle Activity: 5.4 pCi/L (level detected) · MCL 50 · health goal 0 · violation: N · sampled 2024
CopperMetals0.0848 ppm1.3 ppmAction level2023–2025
Your body
According to EPA, short-term exposure above the action level has been linked to stomach and intestinal upset. Long-term exposure has been linked to liver or kidney damage, and people with Wilson’s disease are more sensitive.
Your home & appliances
Copper in water points to pipe corrosion, which can lead to pinhole leaks over time. It also leaves blue-green stains on sinks, tubs, and fixtures.
What it is
A metal that mostly enters tap water from corrosion of copper pipes and brass fixtures, especially when water is acidic (low pH) or sits in pipes for hours.
Exactly as reported
- Copper (distribution): 0.0848 ppm (90th percentile) · range <0.05 · Action level 1.3 · health goal 1.3 · violation: N · sampled 2023–2025
FluorideMinerals1.78 ppm4.0 ppmMCL2024
Your body
EPA sets an enforceable limit of 4.0 mg/L and a secondary standard of 2.0 mg/L. According to EPA, long-term exposure above 4.0 mg/L has been linked to bone disease, and children exposed above 2.0 mg/L may develop dental fluorosis (tooth discoloration or pitting). A 2024 federal NTP review examined fluoride exposure above 1.5 mg/L and children’s IQ.
Your home & appliances
Fluoride does not affect plumbing.
What it is
A mineral that occurs naturally in some groundwater and that many public water systems add at low levels to help prevent tooth decay.
Exactly as reported
- Fluoride: 1.78 ppm (level detected) · range 1.77–1.78 · MCL 4.0 · health goal 4 · violation: N · sampled 2024
ChlorineDisinfectants1.3 ppm4 ppmMax. disinfectant2025
Your body
According to EPA, people drinking water containing chlorine well in excess of the federal limit could experience eye or nose irritation or stomach discomfort. Disinfection itself is an important public health protection.
Your home & appliances
Chlorine causes the “pool” taste and smell many people notice. Over time it can dry out rubber seals and gaskets in fixtures and appliances.
What it is
Public water systems are required to disinfect water to control germs, and most use chlorine or chloramine. A small amount stays in the water all the way to your tap.
Exactly as reported
- Chlorine: 1.3 ppm (level detected) · range 0.42–1.61 · Max. disinfectant 4 · health goal 4 · violation: N · sampled 2025
BariumMetals0.00305 ppm2 ppmMCL2018
Your body
According to EPA, long-term exposure above the federal limit has been linked to increased blood pressure.
Your home & appliances
Barium can add to the mineral scale that builds up in water heaters and pipes.
What it is
A naturally occurring metal found in many rock formations, plus discharges from drilling and metal refining.
Exactly as reported
- Barium: 0.00305 ppm (level detected) · MCL 2 · health goal 2 · violation: N · sampled 2018
Source: Town of Oxford, Annual Drinking Water Quality Report for 2025 (published 2026, covering 2025), via the Maryland Department of the Environment. Values appear as printed. Detected doesn't mean unsafe; most results are below federal limits.
Talbot · Public water system
Town of St. Michaels
LeadMetals1.8 ppb15 ppbAction level2023–2025
Your body
EPA has set a health goal of zero for lead because no safe level of exposure is known. In children, low-level lead exposure has been linked to lower IQ, learning and attention problems; in adults, to raised blood pressure and kidney effects. Pregnant women and young children are most at risk.
Your home & appliances
Lead itself does not damage plumbing, but its presence is a sign of corrosion: water chemistry that dissolves metal from pipes, solder, and fixtures.
What it is
A metal that usually gets into tap water from lead service lines, lead solder, and older brass fixtures inside buildings, not from the water source itself. Homes built before 1986 are more likely to have lead plumbing.
Exactly as reported
- Lead (distribution): 1.8 ppb (90th percentile) · range <0.005 · Action level 15 · health goal 0 · violation: N · sampled 2023–2025
ArsenicMetals11.1 ppb10 ppbMCL2025
Your body
Long-term exposure has been linked to skin changes, circulatory problems, and an increased risk of bladder, lung, and skin cancers (EPA, WHO). EPA’s health goal is zero.
Your home & appliances
Arsenic at levels found in drinking water does not usually harm plumbing or appliances.
What it is
A naturally occurring element found in some rock and soil, and in past use in pesticides and wood preservatives. It has no taste, color, or smell. Some Maryland aquifers contain natural arsenic.
Exactly as reported
- Arsenic (quarterly): 11.1 ppb (highest running annual average) · range 0–11.1 · MCL 10 · health goal n/a · violation: N · sampled 2025Note: Shown exactly as printed. The report states the water meets EPA's arsenic standard. Contact the Town of St. Michaels with questions about this result.
- From the report: The report includes EPA's required notice for arsenic between 5 µg/L and the MCL. It says the water meets EPA's arsenic standard but does contain low levels of arsenic.
Total TrihalomethanesDisinfection byproducts20 ppb80 ppbMCL2025
Your body
According to EPA, long-term exposure above the federal limit has been linked to liver, kidney, or central nervous system problems and an increased risk of cancer. Studies have associated long-term exposure to chlorination byproducts with bladder cancer.
Your home & appliances
Trihalomethanes do not affect plumbing. They can also be inhaled during hot showers.
What it is
A group of four chemicals (chloroform, bromodichloromethane, dibromochloromethane, bromoform) that form when chlorine reacts with natural organic matter in water. Levels are usually higher at the far ends of a distribution system and in warm months.
Exactly as reported
- Trihalomethanes (TTHM) (Distribution): 20 ppb (highest lraa) · range 20–20 · MCL 80 · health goal 0 · violation: N · sampled 2025
Haloacetic AcidsDisinfection byproducts3 ppm4 ppmMCL2025
Your body
According to EPA, long-term exposure above the federal limit has been linked to an increased risk of cancer.
Your home & appliances
Haloacetic acids do not affect plumbing.
What it is
Five related chemicals that form when chlorine reacts with natural organic matter in water. Like TTHM, they are tracked at points around the distribution system.
Exactly as reported
- Haloacetic Acids (HAA5) (Distribution): 3 ppm (highest lraa) · range 3.3–3.3 · MCL 4 · health goal 4 · violation: N · sampled 2025Note: The report prints ppm and 4/4 for this row. The federal MCL for HAA5 is 60 ppb (EPA).
Beta/photon emittersRadiological11.4 pCi/L50 pCi/LMCL2025
Your body
According to EPA, long-term exposure above the federal limit has been linked to an increased risk of cancer.
Your home & appliances
Beta emitters do not affect plumbing.
What it is
A screening measurement of beta radiation in water, from natural minerals (like potassium-40) and some human-made sources. Water systems compare results to a 50 pCi/L screening level.
Exactly as reported
- Gross Beta Particle activity: 11.4 pCi/L (highest value) · range 9.5–11.4 · MCL 50 · health goal 0 · violation: N · sampled 2025
CopperMetals0.0383 ppm1.3 ppmAction level2023–2025
Your body
According to EPA, short-term exposure above the action level has been linked to stomach and intestinal upset. Long-term exposure has been linked to liver or kidney damage, and people with Wilson’s disease are more sensitive.
Your home & appliances
Copper in water points to pipe corrosion, which can lead to pinhole leaks over time. It also leaves blue-green stains on sinks, tubs, and fixtures.
What it is
A metal that mostly enters tap water from corrosion of copper pipes and brass fixtures, especially when water is acidic (low pH) or sits in pipes for hours.
Exactly as reported
- Copper (distribution): 0.0383 ppm (90th percentile) · range <0.005 · Action level 1.3 · health goal 1.3 · violation: N · sampled 2023–2025
FluorideMinerals0.7 ppm4 ppmMCL2025
Your body
EPA sets an enforceable limit of 4.0 mg/L and a secondary standard of 2.0 mg/L. According to EPA, long-term exposure above 4.0 mg/L has been linked to bone disease, and children exposed above 2.0 mg/L may develop dental fluorosis (tooth discoloration or pitting). A 2024 federal NTP review examined fluoride exposure above 1.5 mg/L and children’s IQ.
Your home & appliances
Fluoride does not affect plumbing.
What it is
A mineral that occurs naturally in some groundwater and that many public water systems add at low levels to help prevent tooth decay.
Exactly as reported
- Fluoride: 0.7 ppm (highest level detected) · range 0.7–0.7 · MCL 4 · health goal 4 · violation: N · sampled 2025
ChlorineDisinfectants0.6 ppm4 ppmMax. disinfectant2025
Your body
According to EPA, people drinking water containing chlorine well in excess of the federal limit could experience eye or nose irritation or stomach discomfort. Disinfection itself is an important public health protection.
Your home & appliances
Chlorine causes the “pool” taste and smell many people notice. Over time it can dry out rubber seals and gaskets in fixtures and appliances.
What it is
Public water systems are required to disinfect water to control germs, and most use chlorine or chloramine. A small amount stays in the water all the way to your tap.
Exactly as reported
- Chlorine: 0.6 ppm (highest level detected) · range 0.2–0.8 · Max. disinfectant 4 · health goal 4 · violation: N · sampled 2025
BariumMetals0.01537 ppm2 ppmMCL2025
Your body
According to EPA, long-term exposure above the federal limit has been linked to increased blood pressure.
Your home & appliances
Barium can add to the mineral scale that builds up in water heaters and pipes.
What it is
A naturally occurring metal found in many rock formations, plus discharges from drilling and metal refining.
Exactly as reported
- Barium: 0.01537 ppm (highest level detected) · range 0.01537–0.01537 · MCL 2 · health goal 2 · violation: N · sampled 2025
ChromiumMetals1.6 ppb100 ppbMCL2025
Your body
According to EPA, long-term exposure above the federal limit has been linked to allergic dermatitis. Chromium-6 is the more toxic form and is under ongoing EPA review.
Your home & appliances
At drinking-water levels, chromium does not usually affect plumbing or appliances.
What it is
A metal found naturally in rocks and soil and released by steel, pulp, and other industries. Water reports usually list “total chromium,” which includes chromium-3 and chromium-6.
Exactly as reported
- Chromium: 1.6 ppb (highest level detected) · range 1.6–1.6 · MCL 100 · health goal 100 · violation: N · sampled 2025
SeleniumMetals1.4 ppb50 ppbMCL2025
Your body
According to EPA, long-term exposure well above the federal limit has been linked to hair or fingernail loss, numbness in fingers or toes, and circulatory problems.
Your home & appliances
Selenium at drinking-water levels does not usually affect plumbing.
What it is
A naturally occurring element. In small amounts it is a nutrient; it also comes from petroleum and metal refining and mining.
Exactly as reported
- Selenium: 1.4 ppb (highest level detected) · range 1.4–1.4 · MCL 50 · health goal 0 · violation: N · sampled 2025
Ethylene dibromideIndustrial & farm chemicals10 ppt50 pptMCL2021
Your body
According to EPA, long-term exposure above the federal limit has been linked to liver, stomach, reproductive, or kidney problems and an increased risk of cancer.
Your home & appliances
EDB does not affect plumbing.
What it is
A chemical once used as a gasoline additive and soil fumigant. It can linger in groundwater for decades.
Exactly as reported
- Ethylene dibromide: 10 ppt (highest level detected) · range 10–10 · MCL 50 · health goal 0 · violation: N · sampled 2021
Source: Town of St. Michaels, Annual Drinking Water Quality Report for 2025 (published 2026, covering 2025), via the Maryland Department of the Environment. Values appear as printed. Detected doesn't mean unsafe; most results are below federal limits.
Talbot · Public water system
Town of Trappe
LeadMetalsND ppb15 ppbAction level2022–2024
Your body
EPA has set a health goal of zero for lead because no safe level of exposure is known. In children, low-level lead exposure has been linked to lower IQ, learning and attention problems; in adults, to raised blood pressure and kidney effects. Pregnant women and young children are most at risk.
Your home & appliances
Lead itself does not damage plumbing, but its presence is a sign of corrosion: water chemistry that dissolves metal from pipes, solder, and fixtures.
What it is
A metal that usually gets into tap water from lead service lines, lead solder, and older brass fixtures inside buildings, not from the water source itself. Homes built before 1986 are more likely to have lead plumbing.
Exactly as reported
- Lead (distribution): ND ppb (90th percentile) · Action level 15 · health goal 0 · violation: N · sampled 2022–2024
Total TrihalomethanesDisinfection byproducts · 3 results17 ppb +2 more80 ppbMCL2025
Your body
According to EPA, long-term exposure above the federal limit has been linked to liver, kidney, or central nervous system problems and an increased risk of cancer. Studies have associated long-term exposure to chlorination byproducts with bladder cancer.
Your home & appliances
Trihalomethanes do not affect plumbing. They can also be inhaled during hot showers.
What it is
A group of four chemicals (chloroform, bromodichloromethane, dibromochloromethane, bromoform) that form when chlorine reacts with natural organic matter in water. Levels are usually higher at the far ends of a distribution system and in warm months.
Exactly as reported
- TTHM [Total trihalomethanes]: 17 ppb (highest lraa) · range 17–17 · MCL 80 · health goal 0 · violation: N · sampled 2025
- Chloroform: 0.00316 ppb (level detected) · MCL 0 · health goal 0.07 · violation: N · sampled 2021Note: Chloroform is one of the four trihalomethanes regulated together as TTHM (federal MCL 80 ppb total). The limit columns are shown as printed.
- Dibromochloromethane: 0.00083 mg/L (level detected) · MCL 0.1 · health goal 0.06 · violation: N · sampled 5/10/2021Note: Dibromochloromethane is one of the four trihalomethanes regulated together as TTHM. Values shown as printed.
Haloacetic AcidsDisinfection byproducts6 ppb60 ppbMCL2025
Your body
According to EPA, long-term exposure above the federal limit has been linked to an increased risk of cancer.
Your home & appliances
Haloacetic acids do not affect plumbing.
What it is
Five related chemicals that form when chlorine reacts with natural organic matter in water. Like TTHM, they are tracked at points around the distribution system.
Exactly as reported
- HAA5 Haloacetic Acids: 6 ppb (highest lraa) · range 5.9–5.9 · MCL 60 · health goal 0 · violation: N · sampled 2025
RadiumRadiological0.5 pCi/L5 pCi/LMCL5/14/2024
Your body
According to EPA, long-term exposure above the federal limit has been linked to an increased risk of cancer.
Your home & appliances
Radium does not affect plumbing, but it can build up in softener resin and filter media.
What it is
A naturally occurring radioactive element in some rock and soil, found in certain Maryland aquifers. Reports list radium-226, radium-228, or the two combined.
Exactly as reported
- Radium-228: 0.5 pCi/L (level detected) · MCL 5 · health goal 0 · violation: N · sampled 5/14/2024
Beta/photon emittersRadiological7.6 pCi/L50 pCi/LMCL2024
Your body
According to EPA, long-term exposure above the federal limit has been linked to an increased risk of cancer.
Your home & appliances
Beta emitters do not affect plumbing.
What it is
A screening measurement of beta radiation in water, from natural minerals (like potassium-40) and some human-made sources. Water systems compare results to a 50 pCi/L screening level.
Exactly as reported
- Gross Beta Particle Activity: 7.6 pCi/L (level detected) · MCL 50 · health goal 0 · violation: N · sampled 2024
CopperMetals0.0227 ppm1.3 ppmAction level2022–2024
Your body
According to EPA, short-term exposure above the action level has been linked to stomach and intestinal upset. Long-term exposure has been linked to liver or kidney damage, and people with Wilson’s disease are more sensitive.
Your home & appliances
Copper in water points to pipe corrosion, which can lead to pinhole leaks over time. It also leaves blue-green stains on sinks, tubs, and fixtures.
What it is
A metal that mostly enters tap water from corrosion of copper pipes and brass fixtures, especially when water is acidic (low pH) or sits in pipes for hours.
Exactly as reported
- Copper (distribution): 0.0227 ppm (90th percentile) · range <0.005 · Action level 1.3 · health goal 1.3 · violation: N · sampled 2022–2024
FluorideMinerals0.38 ppm4.0 ppmMCL2021
Your body
EPA sets an enforceable limit of 4.0 mg/L and a secondary standard of 2.0 mg/L. According to EPA, long-term exposure above 4.0 mg/L has been linked to bone disease, and children exposed above 2.0 mg/L may develop dental fluorosis (tooth discoloration or pitting). A 2024 federal NTP review examined fluoride exposure above 1.5 mg/L and children’s IQ.
Your home & appliances
Fluoride does not affect plumbing.
What it is
A mineral that occurs naturally in some groundwater and that many public water systems add at low levels to help prevent tooth decay.
Exactly as reported
- Fluoride: 0.38 ppm (level detected) · MCL 4.0 · health goal 4.0 · violation: N · sampled 2021
ChlorineDisinfectants2.6 ppm4 ppmMax. disinfectant2025
Your body
According to EPA, people drinking water containing chlorine well in excess of the federal limit could experience eye or nose irritation or stomach discomfort. Disinfection itself is an important public health protection.
Your home & appliances
Chlorine causes the “pool” taste and smell many people notice. Over time it can dry out rubber seals and gaskets in fixtures and appliances.
What it is
Public water systems are required to disinfect water to control germs, and most use chlorine or chloramine. A small amount stays in the water all the way to your tap.
Exactly as reported
- Chlorine: 2.6 ppm (average) · Max. disinfectant 4 · health goal 4 · violation: N · sampled 2025
ChromiumMetals2.5 ppb100 ppbMCL2021
Your body
According to EPA, long-term exposure above the federal limit has been linked to allergic dermatitis. Chromium-6 is the more toxic form and is under ongoing EPA review.
Your home & appliances
At drinking-water levels, chromium does not usually affect plumbing or appliances.
What it is
A metal found naturally in rocks and soil and released by steel, pulp, and other industries. Water reports usually list “total chromium,” which includes chromium-3 and chromium-6.
Exactly as reported
- Chromium: 2.5 ppb (level detected) · MCL 100 · health goal 100 · violation: N · sampled 2021
NickelMetals0.0012 mg/L0.1 mg/LMCL2021
Your body
The most common health effect of nickel is an allergic skin reaction in sensitive people. Some water systems still monitor nickel, but it does not currently have an enforceable federal drinking water limit.
Your home & appliances
Nickel can be a sign of corrosion in metal plumbing components.
What it is
A metal found naturally in soil and rock, which can also leach from some metal pipes and fittings.
Exactly as reported
- Nickel: 0.0012 mg/L (level detected) · MCL 0.1 · health goal 0.1 · violation: N · sampled 2021Note: The report lists 0.1 mg/L. Nickel does not currently have an enforceable federal MCL.
Source: Town of Trappe, Annual Drinking Water Quality Report for 2025 (published 2026, covering 2025), via the Maryland Department of the Environment. Values appear as printed. Detected doesn't mean unsafe; most results are below federal limits.
Montgomery and Prince George's · Public water system
WSSC Water
LeadMetals<2.0 µg/L (ppb)15 µg/LAction level2023
Your body
EPA has set a health goal of zero for lead because no safe level of exposure is known. In children, low-level lead exposure has been linked to lower IQ, learning and attention problems; in adults, to raised blood pressure and kidney effects. Pregnant women and young children are most at risk.
Your home & appliances
Lead itself does not damage plumbing, but its presence is a sign of corrosion: water chemistry that dissolves metal from pipes, solder, and fixtures.
What it is
A metal that usually gets into tap water from lead service lines, lead solder, and older brass fixtures inside buildings, not from the water source itself. Homes built before 1986 are more likely to have lead plumbing.
Exactly as reported
- Lead: <2.0 µg/L (ppb) (90th percentile) · range ND–8.11 · Action level 15 · health goal 0 · violation: No · sampled 2023Note: The report notes the lead action level will be lowered to 10 µg/L beginning November 1, 2027.
PFASIndustrial & farm chemicals · 9 resultsPatuxent 1.8 · Potomac 3.7 ng/L (ppt) +8 more4.0 ng/LMCL2025
Your body
Exposure to certain PFAS, such as PFOA and PFOS, has been linked to effects including changes in cholesterol, reduced vaccine response in children, lower birth weight, and increased risk of some cancers (EPA; Fenton et al., 2021). In 2024, EPA set drinking water limits for several PFAS.
Your home & appliances
PFAS do not affect plumbing or appliances.
What it is
Per- and polyfluoroalkyl substances are a large family of man-made chemicals used since the 1940s in non-stick, stain- and water-resistant products and firefighting foams. They break down very slowly in the environment and the body.
Exactly as reported
- PFOA: Patuxent 1.8 · Potomac 3.7 ng/L (ppt) (highest level found by plant) · range <1.6–3.7 · MCL 4.0 · health goal 0 · violation: N/A · sampled 2025Note: The report notes PFAS MCL compliance is calculated quarterly and is scheduled to take effect beginning April 26, 2029.
- PFOS: Patuxent 1.8 · Potomac 4.2 ng/L (ppt) (highest level found by plant) · range ND–4.2 · MCL 4.0 · health goal 0 · violation: N/A · sampled 2025Note: The report notes PFAS MCL compliance is calculated quarterly and is scheduled to take effect beginning April 26, 2029.
- PFHxS: Patuxent 1.6 · Potomac 1.9 ng/L (ppt) (highest level found by plant) · range ND–1.9 · MCL 10 · health goal 10 · violation: N/A · sampled 2025
- PFNA: Patuxent ND · Potomac 1.7 ng/L (ppt) (highest level found by plant) · range ND–1.7 · MCL 10 · health goal 10 · violation: N/A · sampled 2025
- PFBS: Patuxent 2 · Potomac 3.0 ng/L (ppt) (highest level found by plant) · range <1.6–3.0 · violation: N/A · sampled 2025
- PFBA (unregulated): Patuxent 2.5 · Potomac 3.3 ng/L (ppt) (average by plant) · range <1.7–4.2 · sampled 2025
- PFHxA (unregulated): Patuxent 1.9 · Potomac 3.7 ng/L (ppt) (average by plant) · range 1.7–4.6 · sampled 2025
- PFPeA (unregulated): Patuxent 2.3 · Potomac 3.8 ng/L (ppt) (average by plant) · range 2.0–4.3 · sampled 2025
- PFHpA (unregulated): Patuxent 0.6 · Potomac 1.0 ng/L (ppt) (average by plant) · range ND–2.1 · sampled 2025
NitrateNutrientsPatuxent 1.4 · Potomac 1.6 mg/L10 mg/LMCL2025
Your body
According to EPA, infants under six months who drink water with nitrate above the federal limit could become seriously ill (blue baby syndrome). Research has also examined links between long-term exposure and other health effects.
Your home & appliances
Nitrate does not harm plumbing. It can indicate that surface water or septic waste is reaching a well.
What it is
A form of nitrogen from fertilizer, manure, and septic systems that can soak into groundwater. It is a common concern in farming areas, including much of the Eastern Shore.
Exactly as reported
- Nitrate: Patuxent 1.4 · Potomac 1.6 mg/L (highest level found by plant) · range 0.4–1.6 · MCL 10 · health goal 10 · violation: No · sampled 2025
Total TrihalomethanesDisinfection byproducts66 µg/L (ppb)80 µg/LMCL2025
Your body
According to EPA, long-term exposure above the federal limit has been linked to liver, kidney, or central nervous system problems and an increased risk of cancer. Studies have associated long-term exposure to chlorination byproducts with bladder cancer.
Your home & appliances
Trihalomethanes do not affect plumbing. They can also be inhaled during hot showers.
What it is
A group of four chemicals (chloroform, bromodichloromethane, dibromochloromethane, bromoform) that form when chlorine reacts with natural organic matter in water. Levels are usually higher at the far ends of a distribution system and in warm months.
Exactly as reported
- Total Trihalomethanes (TTHMs): 66 µg/L (ppb) (highest locational running annual average) · range 14–102 · MCL 80 · health goal N/A · violation: No · sampled 2025
Haloacetic AcidsDisinfection byproducts48 µg/L (ppb)60 µg/LMCL2025
Your body
According to EPA, long-term exposure above the federal limit has been linked to an increased risk of cancer.
Your home & appliances
Haloacetic acids do not affect plumbing.
What it is
Five related chemicals that form when chlorine reacts with natural organic matter in water. Like TTHM, they are tracked at points around the distribution system.
Exactly as reported
- Haloacetic Acids (HAA5): 48 µg/L (ppb) (highest locational running annual average) · range 16–79 · MCL 60 · health goal N/A · violation: No · sampled 2025
RadiumRadiologicalPatuxent 0.2 · Potomac 0.5 pCi/L5 pCi/LMCL2025
Your body
According to EPA, long-term exposure above the federal limit has been linked to an increased risk of cancer.
Your home & appliances
Radium does not affect plumbing, but it can build up in softener resin and filter media.
What it is
A naturally occurring radioactive element in some rock and soil, found in certain Maryland aquifers. Reports list radium-226, radium-228, or the two combined.
Exactly as reported
- Radium 228: Patuxent 0.2 · Potomac 0.5 pCi/L (highest level found by plant) · range 0.1–0.5 · MCL 5 · health goal 0 · violation: No · sampled 2025
Gross alpha activityRadiologicalPatuxent ND · Potomac 3.2 pCi/L15 pCi/LMCL2025
Your body
According to EPA, long-term exposure above the federal limit has been linked to an increased risk of cancer.
Your home & appliances
Alpha emitters do not affect plumbing.
What it is
A screening measurement of total alpha radiation in water, mostly from natural uranium, radium, and related elements in rock.
Exactly as reported
- Gross Alpha: Patuxent ND · Potomac 3.2 pCi/L (highest level found by plant) · range ND–3.2 · MCL 15 · health goal 0 · violation: No · sampled 2025
Beta/photon emittersRadiologicalPatuxent 4.4 · Potomac 6.1 pCi/L50 pCi/LMCL2025
Your body
According to EPA, long-term exposure above the federal limit has been linked to an increased risk of cancer.
Your home & appliances
Beta emitters do not affect plumbing.
What it is
A screening measurement of beta radiation in water, from natural minerals (like potassium-40) and some human-made sources. Water systems compare results to a 50 pCi/L screening level.
Exactly as reported
- Gross Beta: Patuxent 4.4 · Potomac 6.1 pCi/L (highest level found by plant) · range ND–6.1 · MCL 50 · health goal 0 · violation: No · sampled 2025
Coliform bacteria & E. coliMicrobes0.5% % of monthly samples5%MCL2025
Your body
According to EPA, germs indicated by E. coli can cause stomach cramps, diarrhea, nausea, and headaches, and may pose a special risk for infants, young children, and people with severely compromised immune systems.
Your home & appliances
Bacteria do not damage plumbing, but in wells they can point to a cracked well cap, a damaged casing, or nearby septic issues.
What it is
Coliforms are bacteria that are common in the environment. Water systems test for them as an indicator: their presence means germs may be able to get into the water. E. coli is a specific type that indicates fecal contamination.
Exactly as reported
- Total Coliform: 0.5% % of monthly samples (highest % positive per month) · range 0–0.5% · MCL 5% · health goal 0 · violation: No · sampled 2025
CopperMetals0.12 mg/L1.3 mg/LAction level2023
Your body
According to EPA, short-term exposure above the action level has been linked to stomach and intestinal upset. Long-term exposure has been linked to liver or kidney damage, and people with Wilson’s disease are more sensitive.
Your home & appliances
Copper in water points to pipe corrosion, which can lead to pinhole leaks over time. It also leaves blue-green stains on sinks, tubs, and fixtures.
What it is
A metal that mostly enters tap water from corrosion of copper pipes and brass fixtures, especially when water is acidic (low pH) or sits in pipes for hours.
Exactly as reported
- Copper: 0.12 mg/L (90th percentile) · range 0.014–0.23 · Action level 1.3 · health goal 1.3 · violation: No · sampled 2023
FluorideMineralsPatuxent 0.95 · Potomac 0.8 mg/L4 mg/LMCL2025
Your body
EPA sets an enforceable limit of 4.0 mg/L and a secondary standard of 2.0 mg/L. According to EPA, long-term exposure above 4.0 mg/L has been linked to bone disease, and children exposed above 2.0 mg/L may develop dental fluorosis (tooth discoloration or pitting). A 2024 federal NTP review examined fluoride exposure above 1.5 mg/L and children’s IQ.
Your home & appliances
Fluoride does not affect plumbing.
What it is
A mineral that occurs naturally in some groundwater and that many public water systems add at low levels to help prevent tooth decay.
Exactly as reported
- Fluoride: Patuxent 0.95 · Potomac 0.8 mg/L (highest level found by plant) · range 0.5–0.95 · MCL 4 · health goal 4 · violation: No · sampled 2025
ChlorineDisinfectants1.05 mg/L4 mg/LMax. disinfectant2025
Your body
According to EPA, people drinking water containing chlorine well in excess of the federal limit could experience eye or nose irritation or stomach discomfort. Disinfection itself is an important public health protection.
Your home & appliances
Chlorine causes the “pool” taste and smell many people notice. Over time it can dry out rubber seals and gaskets in fixtures and appliances.
What it is
Public water systems are required to disinfect water to control germs, and most use chlorine or chloramine. A small amount stays in the water all the way to your tap.
Exactly as reported
- Free Residual Chlorine: 1.05 mg/L (highest running annual average) · range 0.02–2.11 · Max. disinfectant 4 · health goal 4 · violation: No · sampled 2025
BariumMetalsPatuxent 0.04 · Potomac 0.05 mg/L2 mg/LMCL2025
Your body
According to EPA, long-term exposure above the federal limit has been linked to increased blood pressure.
Your home & appliances
Barium can add to the mineral scale that builds up in water heaters and pipes.
What it is
A naturally occurring metal found in many rock formations, plus discharges from drilling and metal refining.
Exactly as reported
- Barium: Patuxent 0.04 · Potomac 0.05 mg/L (highest level found by plant) · range 0.02–0.05 · MCL 2 · health goal 2 · violation: No · sampled 2025
TurbidityWater qualityPatuxent 0.05 · Potomac 0.06 NTUTT <1 NTUMCL2025
Your body
Turbidity itself has no health effects, but according to EPA, it can interfere with disinfection and give germs a place to grow.
Your home & appliances
Sediment that causes cloudy water can clog faucet aerators, valves, and appliance inlets.
What it is
Turbidity measures how cloudy water is, from suspended particles like silt and clay. Water systems monitor it to show how well their filtration works.
Exactly as reported
- Turbidity (monthly average): Patuxent 0.05 · Potomac 0.06 NTU (highest monthly average by plant) · range 0.02–0.36 · MCL TT <1 NTU · violation: No · sampled 2025
TritiumRadiologicalPatuxent 213.6 · Potomac 124.3 pCi/L20,000 pCi/LMCL2025
Your body
Tritium is regulated under EPA’s beta/photon limit; EPA uses 20,000 pCi/L as the level that corresponds to that limit.
Your home & appliances
Tritium does not affect plumbing.
What it is
A radioactive form of hydrogen made naturally in the atmosphere and by some human activities. It becomes part of water molecules.
Exactly as reported
- Tritium: Patuxent 213.6 · Potomac 124.3 pCi/L (highest level found by plant) · range ND–213.6 · MCL 20,000 · violation: No · sampled 2025Note: The report notes that 20,000 pCi/L corresponds to the 4 mrem/year MCL for beta particle/photon radioactivity.
SodiumMineralsPatuxent 16 · Potomac 22 mg/LNo federal limit2025
Your body
Sodium in water is a small part of most people’s daily intake. People on sodium-restricted diets may want to talk to their doctor; EPA guidance mentions 20 mg/L for people on very low-sodium diets.
Your home & appliances
Sodium itself does not usually affect plumbing.
What it is
A naturally occurring element in groundwater. It also comes from road salt, some water treatment chemicals, and water softeners.
Exactly as reported
- Sodium (unregulated): Patuxent 16 · Potomac 22 mg/L (average by plant) · range 11–34 · sampled 2025
Source: WSSC Water, 2025 Water Quality Report (published 2026, covering 2025), via the Maryland Department of the Environment. Values appear as printed. Detected doesn't mean unsafe; most results are below federal limits.
Real published data only. Results come from each system's Consumer Confidence Report, as published by the Maryland Department of the Environment. We never estimate or fill in gaps.
Detected isn't the same as unsafe. Most results are below federal limits. We show them so you know what's there and can decide whether you want extra treatment.
Your tap can differ. Home plumbing can add lead, copper, or sediment. A free in-home test shows what's at your faucet.
Now covering 12 Maryland water systems, with more on the way.
All contaminants
Plain-language guides to what each contaminant is, what it can do to your body and your home, and which treatments can reduce it.
Metals
- AluminumSecondary standard 50–200 ppb (EPA, non-enforceable)
- ArsenicMCL 10 ppb; health goal 0 (EPA)Common in wells
- BariumMCL 2 ppm (EPA)
- ChromiumMCL 0.1 ppm (100 ppb) total chromium (EPA)
- CopperAction level 1.3 ppm (EPA)Common in wells
- LeadAction level 15 ppb; health goal 0 (EPA)Common in wells
- LithiumNo federal MCL (monitored under UCMR 5)
- NickelNo current federal MCL
- SeleniumMCL 50 ppb (EPA)
- ZincSecondary standard 5 ppm (EPA, non-enforceable)
Minerals
- ChlorideSecondary standard 250 ppm (EPA, non-enforceable)
- FluorideMCL 4.0 ppm; secondary standard 2.0 ppm (EPA)
- Hardness (calcium & magnesium)No federal limitCommon in wells
- IronSecondary standard 0.3 ppm (EPA, non-enforceable)Common in wells
- ManganeseSecondary standard 0.05 ppm (EPA, non-enforceable)Common in wells
- PotassiumNo federal limit
- SodiumNo federal MCL
- SulfateSecondary standard 250 ppm (EPA, non-enforceable)
Water quality
Disinfectants
Disinfection byproducts
Industrial & farm chemicals
Radiological
- Beta/photon emittersMCL 4 millirem/year (EPA uses 50 pCi/L as a screening level)
- Gross alpha activityMCL 15 pCi/L (EPA)
- RadiumMCL 5 pCi/L combined radium-226/228 (EPA)Common in wells
- RadonNo federal MCL for drinking waterCommon in wells
- TritiumRegulated under beta/photon MCL (20,000 pCi/L equivalent, EPA)
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