On March 29, 2023, the U.S. EPA published the proposed PFAS Drinking Water Regulations in the Federal Register. This proposed rule for Per- and Polyfluoroalkyl Substances (PFAS) includes Maximum Contaminant Levels (MCLs) of 4.0 ng/L for two PFAS constituents (PFOA and PFOS), and an MCL using a Hazard Index of [...]