As of May 2026, the federal PFAS drinking water rule looks different than it did a year ago. On May 1, 2026, the White House Office of Management and Budget completed interagency review and cleared two EPA proposed rules that scale back portions of the April 2024 National Primary Drinking Water Regulation for PFAS. The headline: PFOA and PFOS Maximum Contaminant Levels stay at 4 parts per trillion, the compliance deadline for utilities moves from 2029 to 2031, and four other PFAS compounds — PFHxS, PFNA, GenX (HFPO-DA), and the Hazard Index for mixtures involving PFBS — are being reconsidered and could lose their federal limits entirely.
This article reports those changes and what they mean for households without taking a position on the regulatory direction. The short version for readers: the case for filtering at home has not weakened; the case for waiting on your utility has.
Quick recap — what the original 2024 rule did
The April 2024 PFAS National Primary Drinking Water Regulation was the first time PFAS chemistry had ever been federally regulated in US drinking water. The rule set legally enforceable Maximum Contaminant Levels (MCLs) for six PFAS compounds:
- PFOA: 4 parts per trillion (ppt)
- PFOS: 4 ppt
- PFHxS: 10 ppt
- PFNA: 10 ppt
- HFPO-DA (GenX): 10 ppt
- PFBS: regulated as part of a Hazard Index with the other compounds
The original rule gave public water systems until 2029 to bring levels below the MCLs. Granular activated carbon, ion-exchange resin, and reverse osmosis were the EPA-approved treatment technologies utilities could use to comply.
What changed (May 1, 2026)
EPA announced its intent to modify the rule in April 2025 and spent the year drafting two proposed rules. On May 1, 2026, OMB cleared both and they are now expected to be published in the Federal Register for public comment. According to legal alerts from Best Best & Krieger and White & Case, the proposed changes are:
- PFOA and PFOS MCLs unchanged. Both remain at 4 ppt. EPA has separately confirmed it intends to keep these limits.
- Compliance deadline extended from 2029 to 2031. Public water systems that exceed the PFOA or PFOS MCLs will have an additional two years to install treatment.
- Regulatory determinations reconsidered for PFHxS, PFNA, HFPO-DA (GenX), and the Hazard Index for mixtures involving PFBS. If these are rescinded in the final rulemaking, those four compounds would no longer have federal MCLs.
The Harvard Environmental & Energy Law Program PFAS in Drinking Water tracker is maintaining a live record of every action affecting the rule, including ongoing litigation. The MCLs as currently written remain enforceable while rulemaking proceeds.
What this changes for households
The operative change for anyone drinking municipal water is the timeline. Under the original rule, you could expect your utility to have PFAS treatment in place by 2029. Under the proposed extension, that becomes 2031. For utilities currently over the MCL — which the 2024 rule's monitoring requirements are starting to identify — you are now looking at a longer wait before treatment comes online.
The other change matters less in the short term but is worth flagging. If the regulatory determinations for PFHxS, PFNA, GenX, and the Hazard Index are rescinded, those four compounds may not have any federal drinking water limits at all going forward. State-level regulations would still apply where they exist (several states have their own PFAS standards, often stricter than federal), but the federal floor would be PFOA and PFOS only.
Filtering at home does not have to wait for either timeline. For the best PFAS-free water filters we have vetted by NSF/ANSI P473 certification or published independent testing, the in-home option costs $40 to $500 upfront — meaningfully less than a multi-year wait for utility treatment, and covering compounds beyond just PFOA and PFOS.
What stays the same about filter selection
The certification logic for choosing a filter does not depend on which PFAS compounds are federally regulated. The cleanest signal remains NSF/ANSI P473 — the standard that specifically tests for PFOA and PFOS reduction. P473-certified or P473-tested filters typically also reduce the four other PFAS compounds covered by the original 2024 rule, even if those compounds lose their federal MCLs.
Two products that hit the highest evidentiary bar:
- AquaTru — countertop reverse osmosis with no plumbing, tested to reduce PFOA, PFOS, PFNA, and 80+ other contaminants
- Clearly Filtered — pitcher format, independently tested per NSF/ANSI P473 protocol for PFOA and PFOS
The full breakdown of pitcher, countertop, and under-sink picks lives in our cornerstone PFAS filter guide.
Editorial neutrality
This article reports policy changes neutrally and does not take a position on whether the 2026 rollback is warranted. The regulatory record is still being written — public comment, litigation, and final rulemaking are all ahead. The framing here is operational: what changed, when it changed, and what it means for households deciding whether to filter water at home.
Frequently asked questions
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