Metals
Barium
What it is
A naturally occurring metal found in many rock formations, plus discharges from drilling and metal refining.
Your body
According to EPA, long-term exposure above the federal limit has been linked to increased blood pressure.
Your home
Barium can add to the mineral scale that builds up in water heaters and pipes.
Federal standard: MCL 2 ppm (EPA)
Treatment options that can reduce it
Research & sources (2)
Maryland water systems that reported barium
- Baltimore City Department of Public WorksBaltimore City (also serves most of Baltimore County) · 2025 data
- City of AnnapolisAnne Arundel · 2025 data
- City of CambridgeDorchester · 2025 data
- City of FrederickFrederick · 2025 data
- City of SalisburyWicomico · 2025 data
- Easton UtilitiesTalbot · 2025 data
- Harford County Department of Public WorksHarford · 2025 data
- Howard County Department of Public WorksHoward · 2025 data
- Town of OxfordTalbot · 2025 data
- Town of St. MichaelsTalbot · 2025 data
- WSSC WaterMontgomery and Prince George's · 2025 data
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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