Is radon in my drinking water a health concern?
Over the course of a lifetime, consumption of drinking water containing radon can lead to an increased risk of internal organ cancers, primarily stomach cancer. Also, breathing radon released to the air from household water uses can increase the risk of lung cancer. However, radon in drinking water generally contributes a very small part (i.e., about 1-2 percent) of total radon exposure from indoor air (64 FR 59246, 59248; November 2, 1999). Additional information about radon in indoor air is available from the EPA National Radon Hotline at (800) 767-7236.
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