Nitrate
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.
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
Nitrate does not harm plumbing. It can indicate that surface water or septic waste is reaching a well.
Federal standard: MCL 10 ppm as nitrogen (EPA)
Treatment options that can reduce it
Look for an RO system certified to NSF/ANSI 58 for nitrate reduction.
Maryland water systems that reported nitrate
- Baltimore City Department of Public WorksBaltimore City (also serves most of Baltimore County) · 2025 data
- City of FrederickFrederick · 2025 data
- City of SalisburyWicomico · 2025 data
- Harford County Department of Public WorksHarford · 2025 data
- Howard County Department of Public WorksHoward · 2025 data
- Town of OxfordTalbot · 2025 data
- WSSC WaterMontgomery and Prince George's · 2025 data
See common private-well contaminants →
The information on this site is for general education only and is not medical advice. Talk with a qualified health professional about health concerns. Water treatment equipment performance depends on the system, its certification, and proper maintenance.
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