Radium 228
Radium-228 is a radioactive isotope of radium that occurs naturally in uranium and thorium ores. It is part of the decay chain of uranium-232 and has a half-life of 5.75 years. Radium-228 can be found in groundwater and can contaminate drinking water supplies.
EPA MCLG Level
0.019 ppb
Maximum level that poses minimal health risk based on the latest science
Health Effects
Exposure to radium-228 can lead to an increased risk of cancer, particularly bone cancer, due to its radioactive properties. Long-term exposure can also affect the kidneys and other organs.
Affected Organs & Systems:
Common Sources
- Natural deposits
- Industrial discharge
How to Remove It
Water filters certified under the following NSF standards are effective at removing Radium 228:
EPA MCLG Level
The EPA MCLG represents the maximum level that poses minimal health risk based on the latest scientific research. It's often more protective than federal legal limits.
Contaminant Type
Radium 228 is classified as a Radionuclides contaminant.
This contaminant primarily affects the Bone, Kidneys, and other systems.
Check Your Water
Find out if Radium 228 is in your tap water.
Search Your CityTest Your Water for This Contaminant
Public water reports may not test frequently enough or at your specific tap. Professional home testing provides current, location-specific results.

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