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What are trihalomethanes (THMs)?

April 26, 2017thms trihalomethanes

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What are trihalomethanes (THMs)?

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THMs are chemical compounds that are formed when chlorine mixes with naturally occurring organics in water. The U.S. Environmental Protection Agency (EPA) conducted tests which determined that chloroform (one of the THMs) is carcinogenic when consumed by laboratory animals in large quantities over a prolonged period of time, and is a suspected carcinogen for people. EPA set a standard of 80 parts per billion as the maximum level of THMs in drinking water.