THIS PAGE IS CURRENTLY UNDERGOING UPDATES. What are PFASs and where do they come from? Per- and polyfluoroalkyl substances (PFASs) are manmade chemicals used in many industries to make things waterproof, non-stick, and stain resistant. Some examples of materials that may contain PFASs include firefighting foam, carpet, furniture, waterproof clothing, and certain types of food … Continue reading Per- and Polyfluoroalkyl Substances (PFASS)