PFAS Transparency Act The bill requires an industrial entity that introduces perfluoroalkyl or polyfluoroalkyl substances, commonly referred to as PFAS, into wastewater treatment systems to provide specified advance notices to such systems, including the identity and quantity of such PFAS. PFAS are man-made and may have adverse human health effects. A variety of products contain the compounds, such as nonstick cookware or weatherproof clothing.