PFAS — per- and polyfluoroalkyl substances — are a family of thousands of human-made chemicals used since the 1940s to make products nonstick, waterproof, and stain-resistant. They earned the nickname “forever chemicals” for a reason: the carbon-fluorine bond that makes them so useful also makes them almost impossible to break down. They build up in the environment, in our water, and in our bodies.
Why they matter for your family
Researchers have linked PFAS exposure to a range of serious health effects: certain cancers, hormone and thyroid disruption, liver damage, immune effects (including weaker vaccine response), and developmental harm such as lower birth weight in infants. These are associations built over years of study — not a reason to panic, but a clear reason not to ignore them, especially for pregnant women and young children.
And exposure is widespread. When the EPA set its first federal PFAS limits, it estimated the rule would reduce exposure for roughly 100 million people — a sense of how common these chemicals are in public water.
The protections were real. Then they started shrinking.
What changed in 2024 — and again in 2026
In April 2024, the EPA finalized the first-ever national drinking-water limits for six PFAS, capping the two most-studied — PFOA and PFOS — at 4 parts per trillion each, with utilities given until 2029 to comply.
Then the direction reversed. In 2025 and again with formal proposals in May 2026, the EPA moved to keep limits for only PFOA and PFOS while pushing their compliance deadline back to 2031, and to rescind the limits for the other four chemicals (including GenX and PFHxS) on procedural grounds. If those proposals are finalized, most of the 2024 protections would be unwound, and even the surviving limits would arrive years later.
The takeaway
This is the heart of why we built this site: legal protections are the floor, they move slowly, and they can move backward. Even where a limit stands, your utility may have until 2031 to meet it. Waiting for the rules to catch up means years of exposure in the meantime.
What you can do now
- Find out if PFAS were detected in your water. UCMR5 testing (2023–2025) measured PFAS at thousands of systems; results appear in your utility's report.
- Filter at home. Reverse-osmosis systems and filters certified to NSF/ANSI 53 or 58 for PFAS reduction are the most reliable way to cut PFAS at your tap.
- Don't assume bottled water is cleaner — it's often unregulated for PFAS and not tested the way tap water is.