Few topics have moved as quickly through the water world as PFAS. In a span of a few years they went from a niche scientific concern to a central question in drinking-water policy. For anyone who makes or buys filtration, understanding the landscape is no longer optional.
What PFAS are
PFAS — per- and polyfluoroalkyl substances — are a large family of synthetic chemicals used for decades in products that resist heat, grease, stains, and water. The same chemistry that made them useful also makes them persistent: they break down very slowly in the environment, which is why they are often called "forever chemicals." Over time, some have made their way into water supplies in parts of the country.
Where the rules stand, and how fast they have moved
The clearest way to understand PFAS regulation is to watch how much it has changed in a short window. In April 2024 the U.S. Environmental Protection Agency finalized the first national, enforceable drinking-water standard for PFAS. It set maximum contaminant levels of 4 parts per trillion each for PFOA and PFOS, the two most-studied compounds, and 10 parts per trillion each for PFHxS, PFNA, and GenX, along with a combined limit for certain mixtures. For PFOA and PFOS the agency set its non-enforceable health goal at zero, a measure of how seriously the science is taken.
That standard did not stay fixed. In 2025 the EPA announced, and in 2026 formally proposed, two meaningful changes: keep the 4-part-per-trillion limits for PFOA and PFOS but give public water systems until 2031 to comply, and withdraw the limits set for PFHxS, PFNA, GenX, and their mixture pending further review under the Safe Drinking Water Act. Those proposals were open for public comment through the summer of 2026. Put plainly, in roughly two years the federal picture moved from no national rule, to a broad rule, to a narrower rule on a longer timeline.
Federal action is only half the story. A number of states set their own PFAS limits, and some reach further than Washington, or still cover compounds the federal government has proposed to step back from. The practical result is a moving, uneven map: the requirement that applies to a given product or facility depends on where it operates and what year it is.
Regulations on this topic are changing quickly. The figures above describe federal action as of mid-2026; the binding limit for any location is whatever the relevant federal or state agency has published at the time of the decision.
What the moving target means for manufacturers
When the regulatory number itself can move, designing only to today's limit is a trap. The durable approach is to build and certify to the independent standards that sit beneath the regulation. NSF/ANSI 53 and NSF/ANSI 58 define how a product's reduction claims for PFOA and PFOS are verified by a third party, on the actual compounds, at defined challenge levels. A manufacturer's job is to build to the appropriate standard, certify honestly to the specific substances claimed, leave margin against the strictest rule a product may face — federal or state — and keep tracking the requirements as they shift. Aquamor follows PFAS rulemaking closely for exactly that reason.
What it means for customers
For customers — a homeowner, an OEM brand, or a foodservice operator — the guidance is to be precise and to look past the marketing shorthand. "Reduces PFAS" is not, by itself, a claim worth much: PFAS is a family of thousands of compounds. What matters is whether a product is independently certified to reduce the specific compounds you care about, most often PFOA and PFOS, under NSF/ANSI 53 or NSF/ANSI 58. Read the certification listing rather than the label copy, and check the rule in your own state, since it may reach further than the federal one.
Aquamor's posture on PFAS is the same as its posture on every contaminant: claim only what is certified, describe what the standards actually cover, and keep tracking the regulation so partners are not left to follow it alone.
Sources and further reading
- EPA — Per- and Polyfluoroalkyl Substances (PFAS) in drinking water
- EPA — Agency will keep the PFOA and PFOS maximum contaminant levels (2025)
- EPA — Proposed PFOA and PFOS compliance extension to 2031
- EPA — Proposed rescission of limits for PFHxS, PFNA, GenX, and their mixture
Links lead to the U.S. Environmental Protection Agency. Always confirm the current, binding limit with the relevant federal or state agency at the time of a decision.