A drinking water map created by the Environmental Working Group (EWG) from a collection of national data reveals the concerning number of drinking water systems with levels of per- and polyfluoroalkyl substances, or PFAS, exceeding proposed limits across the U.S. PFAS encompass thousands of man-made chemicals found in everyday items such as nonstick cookware, firefighting foams, grease-resistant food wrappers and water-resistant clothing. PFAS, known as "forever chemicals" because of the...