A study of water systems sampled by New Jersey’s Department of Environmental Protection between 2006 and 2008 found elevated levels of perfluorooctanoic acid, also known as PFOA. This chemical, commonly used in many household products ranging from frying pans to microwave popcorn bags, has been linked to cancer in animals, and was found at levels sometimes two or three times those recommended by the researchers. Even more troubling, water filtration systems had no apparent impact on concentrations of PFOA, with output levels nearly matching those of untreated water.

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