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In February 2019, EPA announced in the Per- and polyfluoroalkyl substances (PFAS) Action Plan that the Agency was taking steps to evaluate if industrial sources warranted regulation through national Effluent Limitation Guidelines (ELGs) to address PFAS discharges. After studying the available data regarding wastewater discharges from facilities that manufacture PFAS, the EPA is initiating a rulemaking to revise ELGs for these manufacturers. As a preliminary step, the EPA intends to publish an advanced notice of proposed rulemaking (ANPRM) to solicit data and information regarding manufacturers of PFAS and the presence and treatment of PFAS in discharges from this industrial category. The EPA also intends to request information regarding PFAS formulators, which are facilities that produce a variety of PFAS products and materials from PFAS feedstocks. The EPA was able to obtain only limited data regarding formulators through publicly available sources, and additional information would inform the Agency’s consideration of discharges from PFAS formulators and the need for updated ELGs for these facilities. PFAS manufacturers and formulators are currently regulated under the Organic Chemicals, Plastics and Synthetic Fibers (OCPSF) ELGs found at 40 CFR part 414. Based, in part, on the public comments EPA receives on the ANPRM, the EPA intends to develop a proposed regulation.