This is a notice extending the public comment periods for two EPA actions related to per- and polyfluoroalkyl substances (PFAS). The first action, originally published December 26, 2024, covers draft Clean Water Act national recommended ambient water quality criteria for human health protection for PFOA, PFOS, and PFBS; its comment deadline is extended 60 days to April 25, 2025. The second action, originally published January 15, 2025, covers a draft sewage sludge risk assessment for PFOA and PFOS; its comment deadline is extended 30 days to April 16, 2025. Neither underlying document is reproduced here; substantive analysis is in the original notices.12