Radiological
Radium (combined -226 & -228) in your water
Is Radium (combined -226 & -228) in drinking water dangerous?
It depends on the level and how long you're exposed. The EPA legal limit (MCL) for Radium (combined -226 & -228) is 5 pCi/L. Meeting the legal limit isn't the same as zero risk — test your water to know your level.
How do you remove Radium (combined -226 & -228) from water?
Radium (combined -226 & -228) is treated by Water Softener and Reverse Osmosis. Choose a system independently certified to NSF/ANSI standards to reduce Radium (combined -226 & -228), and test your water first to confirm the level.
Source: EPA MCL / MCLG; WHO guidelines; NSF/ANSI · 2026
Health effects
Radium is a naturally radioactive element that leaches from rock into groundwater. Long-term exposure increases the risk of bone cancer and other cancers because it concentrates in bone. The federal limit covers the combined activity of radium-226 and radium-228.
The health-based goal vs. the legal limit
The federal legal limit (MCL) is the maximum allowed by law. The EPA health goal (MCLG) is the level below which no health risk is expected — it is non-enforceable and often stricter than the legal limit.
EPA health goal (MCLG)
No federal health goal set
Federal legal limit (MCL)
5 pCi/L
Source: EPA National Primary Drinking Water Regulations (MCL / MCLG) · 2026
What removes Radium (combined -226 & -228)
Ion exchange
Water Softener
Swaps the calcium and magnesium that cause hard water for sodium — so scale stops forming.
Look for: NSF/ANSI 44 certification
How it works→Semipermeable membrane filtration
Reverse Osmosis
Pushes water through a fine membrane that removes the dissolved solids most filters miss.
Look for: NSF/ANSI 58 certification
How it works→Where Radium (combined -226 & -228) has been found
Radium (combined -226 & -228) shows up in the public water record for these cities. Each page has the measured level, the legal limit, and what removes it.
- 1
See your Water Score
Free, instant, no signup.
- 2
Get your custom fix-it plan
Exactly what your water needs.
- 3
Request your free water test
Availability varies by location; no obligation to buy.
Is Radium (combined -226 & -228) in your water?
Check your city's public record, then book a free 30-minute test to confirm what's in your home.