PFAS are a class of man-made chemicals used to make products ranging from firefighting foam to waterproof mascara. And as a result, they're basically in everything else too – including the bodies of about 97% of Americans. In the first of a two-part series, The Common talks with WBUR Climate and Environment Correspondent Barbara Moran about PFAS levels in Massachusetts drinking water, and the high cost of managing it. 

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