Per- and polyfluoroalkyl substances (PFAS) are a group of man-made chemicals that have been used in many industrial applications and consumer products such as carpeting, waterproof clothing, upholstery, food paper wrappings, personal care products, fire-fighting foams, and metal plating. They have been used in a variety of industries around the globe and have been used in the United States since the 1940s. They are still used today.