Radiological
Radium-226 in your water
Health effects
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.
The guideline vs. the legal limit
The federal legal limit is the maximum allowed by law. The EWG health guideline is what independent scientists consider safe — it is often far stricter.
Health guideline (EWG)
0.05 pCi/L
Federal legal limit (MCL)
5 pCi/L
Source: EWG Tap Water Database & EPA MCLs · 2026
What removes Radium-226
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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Is Radium-226 in your water?
Check your city's public record, then book a free 30-minute test to confirm what's in your home.