EPA Making Significant Moves on PFAS in Nation’s Drinking Water In March 2021, the U.S. Environmental Protection Agency (“EPA”) published a proposed fifth Unregulated Contaminant Monitoring Rule (“UCMR 5”). The proposed UCMR 5 will require public water systems to collect national occurrence data for 30 chemical contaminants, including 29 per- and polyfluoroalkyl substances (“PFAS”) [...]