According to recent reports, the U.S. EPA has asked a federal court to vacate its 2024 drinking water limits for four PFAS chemicals, citing procedural flaws in how the standards were set. Limits for PFOA and PFOS remain unaffected and are still being defended.

A ruling is expected to shape whether these “Index PFAS” standards stand or are reissued through new rulemaking, with compliance deadlines currently set for 2029. 9/17/2025