Radon in Drinking Water Testing for home, business and industry
Radon in Drinking Water (EPA Proposed MCL = 4,000 pCi/L)
(NH Recommendation = 2,000 pCi/L)
(ME Recommendation = 4,000 pCi/L)
Radon gas is normally found in most well water. Bedrock wells typically have much higher levels then dug or point wells. The most significant concern from radon in water is inhalation of radon gas once it enters the air (i.e. shower steam, washing machine, dishwasher or boiling water on the stove).
At present, there is no federal or state regulated standard for radon in drinking water. In 1991, the EPA proposed a limit of 4,000 pCi/L for public water systems. In response to this recommended level, the NewHampshire Department of Environmental Services (DES) and New Hampshire Department of Health and Human Services (DHHS) jointly recommended a guideline of 2,000 pCi/L for public water supplies. Although this recommendation was never acted upon by any regulatory agency, it is commonly referred to in New Hampshire. Maine recommends a level of 4,000 pCi/L, and Massachusetts recommends 10,000 pCi/L. A useful equation developed by the EPA for the transfer of radon from water to air is that for every 10,000 pCi/L of radon in water it adds 1 pCi/L to the indoor air.
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