PFAS · in your tap water
Industrial firefighting / non-stick · long half-life in body
PFAS — per- and polyfluoroalkyl substances — are a family of thousands of industrial chemicals (more than 9,000 by some inventories) used in firefighting foam, non-stick coatings, water-repellent fabrics, and food packaging. They're called 'forever chemicals' because they don't break down in the environment OR in the human body. In April 2024 the EPA finalized the first national drinking-water limits — 4 parts per trillion (ppt) for PFOA and PFOS, with a health goal of zero — plus limits on four other PFAS. In 2025–2026 the EPA proposed keeping the PFOA/PFOS limits (with the compliance deadline pushed to 2031) while rescinding the limits on the other four; those revisions are proposed, not yet final.
This is the one trending in the news for a reason. RO at the kitchen tap is the highest-confidence fix.
In April 2024 the EPA set the first national PFAS drinking-water limits — 4 ppt for PFOA and PFOS (health goal: zero), plus 10 ppt limits for PFHxS, PFNA and GenX and a Hazard Index for mixtures. In 2025–2026 the EPA proposed keeping the PFOA/PFOS limits (pushing compliance to 2031) while rescinding the other four; those changes are proposed, not yet final, so the 2024 rule still stands for now.
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Every source below was checked to make sure the link works and backs the claim it's next to. These are the primary regulators and peer-reviewed studies — not our opinion.
The 2024 limits (PFOA/PFOS at 4 ppt, goal of zero) plus the 2025–2026 revision status.
May 2025: keep the 4-ppt PFOA/PFOS limits, extend compliance to 2031, reconsider the other four.
2026 proposal to rescind the limits on PFHxS, PFNA, GenX, and the Hazard Index (not yet final).
Reverse osmosis, granular activated carbon, and ion exchange — look for NSF/ANSI 53 or 58.
Associations with cholesterol, kidney/testicular cancer, immune and thyroid effects, hypertension.
PFAS persistence and the NTP finding that PFOA/PFOS are immune hazards.
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Get my free water report Book a free checkupThis page is general water-quality education, not medical advice. Health classifications and limits are attributed to the EPA, EWG, IARC, ATSDR/CDC, WHO and the cited studies. Contaminant levels vary by water system and home — the only way to know what's in your water is to test it. Prepared by SwiftPro Heating, Cooling & Plumbing.