The 2019 movie “Dark Waters” alerted the public to health hazards posed by perfluoroalkyl and polyfluoroalkyl substances (PFAS, also know as PFOA and PFOS) that contaminated water and groundwater around manufacturer DuPont’s facility in Parksburg, West Virginia. The chemicals have been linked to deaths, cancer and more–and they are pervasive, found in 97% of Americans tested, PBS reports, citing a U.S. National Health and Nutrition Examination study in 2015.