Radium, combined (-226 & -228)
EPA MCL
5 pCi/L
EPA has not set a health goal (MCLG) for this contaminant. This is the enforceable limit water systems must meet.
Health Effects
Increased risk of cancer
Source: EPA — National Primary Drinking Water Regulations (retrieved 2026-07-27)
Common Sources
- Erosion of natural deposits
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The EPA MCL for Radium, combined (-226 & -228) is 5 pCi/L. Upload your water test (PDF or a photo) and we'll email a plain-English reading of where your result lands — and every other number — free. Educational only, no medical claims.
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About the EPA MCL
This is the enforceable federal limit water systems must meet. EPA has not set a separate non-enforceable health goal (MCLG) for this contaminant.
Contaminant Type
Radium, combined (-226 & -228) is classified as a Radionuclides contaminant.
Related Radionuclides Contaminants
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