Radium-228 in Drinking Water: Health Risks, Sources, and How to Remove It
Radium-228 is a drinking water contaminant belonging to the radionuclide category. The Environmental Protection Agency (EPA) has established a Maximum Contaminant Level (MCL) of 5 pCi/L for this substance. Because of its radioactive nature, maintaining levels below this regulatory limit is critical for drinking water safety.
Health Effects
Exposure to Radium-228 in drinking water is associated with serious health concerns. Specifically, long-term ingestion of this radionuclide is linked to an increased risk of cancer. Minimizing exposure to this contaminant is important to help reduce these potential long-term risks.
How Radium-228 Gets Into Tap Water
Radium-228 originates from natural deposits in the earth. As groundwater flows through rock and soil containing these deposits, the radioactive substance can dissolve into the water supply. This natural weathering process is the primary way the contaminant enters drinking water.
How to Remove Radium-228 From Your Water
Several treatment methods are available to remove Radium-228 from drinking water, including ion exchange and reverse osmosis. Additionally, lime softening can be utilized by treatment systems to reduce the concentration of this radionuclide. Certified filtration systems using these technologies are commonly recommended for household treatment.
Should You Test Your Water?
To determine if Radium-228 is in your drinking water, you can check your local utility's annual consumer confidence report or utilize the WaterQ database. If you use a private well, periodic testing through a certified laboratory is recommended given the radionuclide category of this contaminant. You can also look up your local water system on WaterQ or check the Radium-228 data page for reported levels in your area.
Frequently Asked Questions
Is Radium-228 dangerous in drinking water?
Yes, Radium-228 in drinking water is a health concern as it is a radionuclide that carries an increased risk of cancer. Because of these potential health impacts, the EPA regulates its concentration to keep exposure as low as possible. Consuming water that exceeds the established safety standard can increase long-term health risks.
How does Radium-228 get into tap water?
Radium-228 gets into tap water when groundwater dissolves the contaminant from natural deposits in the ground. This occurs naturally as water flows through rock and soil formations containing the radionuclide.
How can I remove Radium-228 from my water?
You can remove Radium-228 using treatment methods such as ion exchange, reverse osmosis, or lime softening. Homeowners often install point-of-use or whole-house systems utilizing these technologies to reduce radionuclide levels.
Source: EPA National Primary Drinking Water Regulations and WaterQ National Database. For more contaminants, visit our contaminant library.
What actually removes radium
Radium is one of the few cases where a water softener is a genuine health treatment rather than a comfort appliance — the ion-exchange resin that captures calcium captures radium very effectively. If you already run a softener, much of the work may already be done. Reverse osmosis covers the drinking tap. Carbon does nothing.
Works
- Ion-exchange water softenerThe only real fix for hard water. Also very effective on radium.
- Reverse osmosis (NSF 58)The broadest removal available at home: arsenic, nitrate, fluoride, PFAS, TDS.
Will not fix this
- Basic activated carbon (NSF 42)
- Carbon certified for lead (NSF 53)
- UV disinfection (NSF 55)
- Boiling Makes it worse — evaporation concentrates what's left behind.
Test before you buy.Radium can't be seen, tasted or smelled, and the right hardware depends on the concentration you actually have. A certified lab test costs a fraction of the wrong filtration system. Start with your local water quality report, and get a mail-in lab test if you're on a private well.
Options that carry the right certification
Ordered cheapest-adequate first. Prices are indicative bands and move often.
| Product | Certification | Upfront | Per year | |
|---|---|---|---|---|
| Fleck 5600SXT Metered SoftenerWhole house | Standard metered ion-exchange softener valve, the long-time reference design.Catch:Adds sodium to your water and needs a drain plus salt refills. Does nothing for lead, PFAS or nitrate. | $600–900 | $60–150 | Check price |
| APEC ROES-50 EssenceUnder-sink | Built with WQA-certified components to NSF/ANSI 58.Catch:Needs an under-sink drain connection and a spare hole for the dedicated faucet. Strips minerals — some people dislike the flat taste. | $180–240 | $50–80 | Check price |
| iSpring RCC7AK 6-Stage ROUnder-sink | WQA Gold Seal certified to NSF/ANSI 58.Catch:The alkaline remineralization stage adds minerals back, which slightly raises TDS readings — expected, not a fault. | $200–280 | $60–90 | Check price |
Certification listings change. Before buying, confirm the current listing for the exact model in the NSF certified products database — a manufacturer's marketing page is not a certification. WaterQ earns a commission on purchases made through these links at no extra cost to you; see our affiliate disclosure. This is general information, not medical or engineering advice.
For a full breakdown of certifications, running costs and the models worth considering, see our buying guide for radium.