But in a memo this month, the EPA encouraged agencies to request an extension for implementing PFAS standards due to its proposed changes. However, he argued an anti-backsliding provision under the Safe Drinking Water Act may bar the Trump EPA from rolling back PFAS standards. Industry groups have urged the state to hold off on bringing its standards in line with federal PFAS limits. “If the federal standards change because of EPA action or litigation, the state rule will not automatically reflect those changes. It would also cost an estimated $12.6 million for 96 public water systems to address PFAS levels above federal limits.