As many as 110 million Americans may be drinking water contaminated by a toxic class of chemicals that according to the U.S. Environmental Protection Agency (EPA) are used in "stain- and water-repellent fabrics, nonstick products (e.g., Teflon), polishes, waxes, paints, cleaning products, and fire-fighting foams (a major source of groundwater contamination at airports and military bases where firefighting training occurs)."
The chemicals, referred to as per- and polyfluoroalkyl substances or PFAS, were detected by EPA-mandated testing of U.S. water supplies between 2013 and 2015. The full results of that testing have not been made public. An analysis done by the Environmental Working Group using available data uncovered the widespread contamination. The group's analysis was released last week.
Firefighting foams are a major source of the contamination, primarily from their release during routine training drills at both civilian and military airports. But the desire of consumers for nonstick pans and stain- and water-repellent clothing and carpets brings direct contact with the toxic chemicals.