However, sealing is an important part of active soil depressurization. Use polyurethane caulk for the best adhesion to concrete. There is currently no EPA standard for radon in drinking water. In most of the state, radon in water is not currently a concern. Most of the risk for water from is from radon escaping the water into the air you breathe, and the rest is from drinking fresh, unboiled tapwater.
Boiling water drives out the radon.
For drinking cold, about a gallon of water per person per week can be inexpensively imported from a low-radon source. Lung Cancer and Radon Radon is the second leading cause of lung cancer, after smoking. Your lung cancer risk from Radon is determined by the amount you re exposed to, and the length of time you re exposed to it. The higher the level, the greater the risk. For further information about Radon and lung cancer, see the EPA radon web page .