What is an MEG?
The Maine Center for Disease Control, Environmental and Occupational Health Program is responsible for developing Maximum Exposure Guidelines (MEG) for private wells. The MEG for radon has been 20,000 picocuries per liter (pCi/L); this MEG was established in the late 1970s. MEGs represent levels of chemicals in water below which there are minimal risks from lifetime ingestion of water. MEGs are used by multiple entities, but are primarily designed as guidance for homeowners with wells. A chemical that exceeds an MEG may result in a recommendation to reduce exposure.
