Attorney General Anthony G. Brown recently filed comments opposing the Environmental Protection Agency’s (EPA) proposed rollback on limits to four PFAS “forever” chemicals in drinking water. The current standards, set under the Safe Drinking Water Act (SDWA), were an important step towards increasing oversight of these chemicals in public water systems, and the proposed rollback would deprive the public of these important protections. In 2024, the EPA finalized a rule to regulate the testing and treatment of public drinking water systems for multiple specific PFAS chemicals and mixtures of those compounds under the SDWA. Now, the EPA is proposing to eliminate the drinking water limits previously set for four PFAS compounds, in violation of federal law. The SDWA was designed with an anti-backsliding clause, intended to prevent the EPA from weakening drinking water standards once they are finalized, which is precisely what EPA’s proposal here would do.