Mohave County · Arizona · EPA SDWIS 2026Q2
Radium-226 in Kingman water
Radium-226 measured above the federal limit in Kingman's public supply.
Radium-226
Violation on record
43 EPA records on file (most recent 2025). Radium-226 is a naturally radioactive isotope that seeps from rock into groundwater. Over years of exposure it concentrates in bone and raises the risk of bone and other cancers. It is regulated together with radium-228 under the combined radium standard.
EPA records reflect the public water system, not your home's plumbing. Health-based goals (EPA MCLG / WHO) are health targets and are often stricter than the federal legal limit (the MCL). A utility appearing on this list does not by itself mean the water is unsafe to drink. The only way to know what is in your specific home is to test your own water.
The health-based goal vs. the legal limit
The federal legal limit (MCL) is the maximum allowed by law. The health-based goal (EPA MCLG / WHO) is a stricter health target — not itself a legal limit.
Health-based goal (EPA MCLG / WHO)
0.05 pCi/L
Federal legal limit (MCL)
5 pCi/L
Source: EPA MCL / MCLG; WHO guidelines · 2026
What removes Radium-226
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We're still cataloging certified systems for Radium-226. A free water test is the fastest way to get a matched recommendation.
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