Drinking water
The 2024 PFAS National Primary Drinking Water Regulation established enforceable standards for six PFAS. On 18 May 2026, EPA announced proposed rules that would retain the PFOA and PFOS standards, provide a pathway for systems to request additional compliance time to 2031, and rescind the federal drinking-water regulations for PFHxS, PFNA, HFPO-DA (GenX) and the Hazard Index mixture. Because these were proposals as of this site's 1 October 2026 update, they should not be presented as final changes.
CERCLA / Superfund
PFOA and PFOS, including their salts and structural isomers, were designated hazardous substances under CERCLA in 2024. The designation supports reporting, response and cost-recovery authorities associated with releases.
Destruction and disposal
EPA released updated interim guidance on 23 April 2026. The guidance is non-binding and discusses commercially available large-scale management categories and a framework for evaluating emerging destruction technologies.
Analytical methods
EPA continues to publish and develop PFAS analytical methods, including Method 1633A and Method 1621. Regulatory use depends on the relevant program and rulemaking status.