It seems that every day, news articles announce previously unknown detections of per- and polyfluoroalkyl substances (PFAS) in drinking water supplies or identify new consumer products as potential sources of PFAS. PFAS, sometimes called "forever chemicals," are a large group of human-made chemicals used to make coatings and products that resist heat, oil, stains, grease and water. These chemicals are commonly found in products such as clothing, food packaging, cookware, cosmetics, carpeting and fire-fighting foam, and have been used to make fluorinated, high-density polyethylene containers.