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Radon gas is measured in picoCuries per liter (pCi/L). The current airborne radon level at which the EPA recommends action is 4.0 pCi/L. Further, the EPA says to consider action if the level is 2 to 4 pCi/L and suggests that every home and workplace be tested for radon gas in the air. Radon concentrations often are much higher in water than in air. As a general rule, a measurement of 10,000 pCi/L of radon in well water will contribute 1.0 pCi/L throughout the household air. However, this may vary depending on the amount of water used, the air exchange rate of the building and the proximity of an airborne test to the point of water usage. The Safe Drinking Water Act Amendment of 1996 mandates the adoption of municipal guidelines. It is believed that the final maximum contaminant level for radon in municipal well water will be between 300 and 4,000 pCi/L. State recommendations for waterborne radon vary, so check with your state radon office for information. (See State Radon Offices) |
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