Radium
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.
Your body
According to EPA, long-term exposure above the federal limit has been linked to an increased risk of cancer.
Your home
Radium does not affect plumbing, but it can build up in softener resin and filter media.
Federal standard: MCL 5 pCi/L combined radium-226/228 (EPA)
Treatment options that can reduce it
Research & sources (3)
Maryland water systems that reported radium
- Baltimore City Department of Public WorksBaltimore City (also serves most of Baltimore County) · 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 TrappeTalbot · 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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