Clean Water Standards for PFAS Act of 2020 This bill directs the Environmental Protection Agency (EPA) to review certain point sources that discharge perfluoroalkyl and polyfluoroalkyl substances, commonly referred to as PFAS. Based on this review, the EPA must establish effluent limitations and pretreatment standards, as well as publish water quality criteria, for certain 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. The bill also directs the EPA to award grants to owners and operators of publicly owned treatment works to implement PFAS pretreatment standards.