EPA Moves to Rescind Four PFAS Drinking-Water Limits and Push the PFOA/PFOS Deadline to 2031

The U.S. Environmental Protection Agency announced two proposed rules on May 18, 2026 that would substantially scale back the landmark PFAS drinking-water protections finalized just two years earlier. One rule would rescind the enforceable limits for four “forever chemicals” — GenX, PFHxS, PFNA, and the Hazard Index mixture that combines them with PFBS. The other would keep the 4-parts-per-trillion limits for PFOA and PFOS but let water systems delay compliance by two more years, from 2029 to 2031.

Together the proposals unwind much of the April 2024 National Primary Drinking Water Regulation for six PFAS — the first federal limits ever set for these compounds. The agency frames the move as correcting what it calls the prior administration’s “failure to follow the clear statutory requirements” of the Safe Drinking Water Act. Environmental groups call it a capitulation to chemical-industry and utility lobbying that will leave millions of Americans drinking PFAS-contaminated water for years longer.

What the Two Rules Actually Do

EPA split the action into two separate proposed rulemakings, both published for public comment under Docket ID EPA-HQ-OW-2025-0654.

The rescission rule would withdraw the federal Maximum Contaminant Levels (MCLs) for:

GenX (HFPO-DA) — previously limited to 10 parts per trillion (ppt)
PFHxS — previously 10 ppt
PFNA — previously 10 ppt
The Hazard Index — a combined measure for mixtures of GenX, PFHxS, PFNA, and PFBS

The compliance-extension rule leaves the two most-studied compounds regulated. The 4 ppt MCLs for PFOA and PFOS stand, but water systems can apply for two extra years — pushing their compliance deadline from 2029 to 2031.

The practical effect: of the six PFAS that EPA regulated in 2024, only two would retain enforceable limits, and even those get a longer runway. The agency says the extension responds to utilities that argued the original timeline was unworkable given treatment-technology procurement, financing, and construction lead times.

Why GenX Matters — and Why Rescinding Its Limit Is Significant

GenX is not an abstraction. It is the compound at the center of the Cape Fear River contamination in North Carolina, where Chemours discharged the chemical into the drinking-water source for hundreds of thousands of residents downstream of Fayetteville. The 2024 rule’s 10 ppt GenX limit was, in part, a direct regulatory response to that crisis.

GenX belongs to the same family of fluorinated compounds as 1,4-dioxane and other industrial contaminants that conventional treatment does not remove. Rescinding its federal limit does not make it safe — it removes the nationwide enforceable floor that would have required utilities to test for and treat it. States that have set their own GenX standards, including North Carolina, are unaffected; residents elsewhere lose the federal backstop.

The Public-Comment Timeline

EPA opened both proposals for public comment with two key dates:

July 1, 2026 — the deadline to pre-register to speak at the virtual hearing (registration is required to give verbal comment).
July 7, 2026 — a virtual public hearing where registered participants may submit verbal comments on either rule.
July 20, 2026 — the deadline for written comments in the federal docket at regulations.gov (Docket EPA-HQ-OW-2025-0654).

After the comment period closes, EPA must review submissions before issuing final rules. Litigation is widely expected regardless of the outcome — both from environmental and public-health groups if the rescission is finalized, and from industry if it is not. The 2024 rule itself remains the subject of pending legal challenges, which complicates the regulatory picture further.

The Reaction

The response from public-health and environmental organizations was immediate and sharp.

The Environmental Working Group was blunt. “The Trump EPA is caving to chemical industry lobbyists and water utility pressure — and in doing so it is condemning millions of Americans to drink contaminated water for years to come,” said Ken Cook, EWG’s president and co-founder. EWG has estimated that 176 million Americans are exposed to PFAS in their tap water.

The Environmental Defense Fund focused on the toxicology. “PFAS are highly toxic, even at very low levels, and are linked to liver damage, cancers and other health problems for children and pregnant women,” said Maria Doa, the group’s senior director of chemicals policy.

EPA, for its part, characterized the action as “scientifically sound” and procedurally required — arguing that the 2024 rule for the four rescinded compounds did not follow the cost-benefit and statutory steps the Safe Drinking Water Act demands.

The water utilities themselves occupy a more complicated middle ground. The American Water Works Association (AWWA) and the Association of Metropolitan Water Agencies (AMWA) — which represent the systems that have to install and pay for PFAS treatment — had argued before the rule was finalized that the original 4 ppt limits for PFOA and PFOS were too aggressive and that standards closer to 10 ppt would be more appropriate and affordable to implement nationwide. The utility groups frame their goal as a regulation that is protective, science-based, and achievable; that puts them at odds with environmental groups over the numbers, even as both press EPA to keep some enforceable federal standard rather than leave a patchwork.

How This Connects to the Rest of EPA’s PFAS Agenda

The rescission is consistent with the direction the agency has signaled all spring. In April, EPA announced its “PFAS OUT” initiative and delayed TSCA PFAS reporting requirements for manufacturers. The agency has paired the regulatory pullback with funding promises — roughly $1 billion for drinking-water treatment projects — but the enforceable standards themselves are what determine whether utilities are legally required to act.

Meanwhile, states continue to set their own PFAS limits, and Maine has been tightening its standards rather than loosening them. The result is a widening patchwork: a resident’s protection from PFAS in tap water now depends heavily on which state they live in, not just on federal rules.

What Residents Should Do

The proposed rules do not change anything overnight — the 2024 limits remain technically on the books until any rescission is finalized — but they signal that federal protection for four PFAS compounds may not arrive. If you are concerned about PFAS in your water, the practical steps do not depend on EPA’s timeline:

Find out what’s in your water. Read your utility’s annual Consumer Confidence Report, and check whether your system has reported PFAS results under UCMR 5 monitoring. Our PFAS explainer walks through what the numbers mean.
Test if you’re on a private well. Federal and state rules don’t cover private wells at all. If you suspect PFAS — especially near a military base, airport, or industrial site — see our guide to PFAS in private wells and how to test your tap water.
Filter at the tap. Certified reverse-osmosis systems remove the large majority of PFAS; some activated-carbon and ion-exchange filters are also rated for it. See our reverse-osmosis system guide and under-sink filter guide for NSF/ANSI 53 and P473-certified options.
Pregnant residents and households with infants face the highest-stakes exposure. Review our pregnancy water-quality guide and infant water-safety guide.

What Comes Next

The comment period runs through July 20, with the virtual hearing on July 7. EPA will then weigh submissions before finalizing — a process that typically takes months and, in this case, will almost certainly be followed by litigation. The PFOA/PFOS limits remain in force at 4 ppt; the open question is whether the four rescinded compounds will retain any federal limit at all.

How WaterVerge Tracks PFAS

WaterVerge integrates EPA UCMR 5 PFAS monitoring results into city water profiles as systems report them, and our PFAS contaminant page covers the health basis for the 4 ppt threshold and the treatment technologies proven to remove these compounds. As the rescission and extension rules move through comment and finalization, we’ll track which compounds keep federal limits and which fall to the states.