On May 18, 2026, EPA announced two proposals that affect the federal PFAS rule we described in our explainer below. The first would let water systems request a two-year extension — from 2029 to 2031 — to comply with the enforceable limits for PFOA and PFOS. The second would rescind the individual limits for three other PFAS compounds (PFHxS, PFNA, and HFPO-DA/GenX) and the combined "Hazard Index" limit for mixtures of those plus PFBS, on the grounds that EPA says the prior administration didn't follow required Safe Drinking Water Act procedure in setting them.
What doesn't change: the 4 ppt limits for PFOA and PFOS individually — the two compounds most consistently linked to health effects in research, and the one (PFOA) already detected in Weir River water above that level — are not part of either rescission proposal. What's uncertain is timing: a system could legally take until 2031 rather than 2029 to act on it. Because Hull's tap water is the Weir River system's water, this timing question affects Hull households exactly as much as it affects Hingham's, whether or not Hull residents ever see it discussed that way.
EPA held a public hearing on both proposals on July 7, 2026. Public comment closes July 20, 2026, and as of this writing neither proposal is final. Treat the 2024 rule as the current baseline until EPA actually finalizes a change.
See the full regulatory timeline for how this fits with the 2020 state standard and the 2024 federal rule.
Until April 2024, there was no federal limit on PFAS in drinking water at all — only the Massachusetts state standard set in 2020. That changed when EPA finalized its National Primary Drinking Water Regulation (NPDWR) for PFAS: the first time PFAS compounds have been individually, enforceably regulated at the federal level.
The rule set limits of 4 parts per trillion (ppt) each for PFOA and PFOS, 10 ppt each for three additional compounds (PFHxS, PFNA, and HFPO-DA), and a combined "Hazard Index" limit for mixtures of those plus PFBS. Water systems nationwide were given until 2027 to complete initial monitoring and until 2029 to come into full compliance — with treatment, blending, or a new water source if needed.
For Hull specifically, this rule doesn't distinguish between water that travels a shorter or longer distance through the distribution system. The Weir River system's 5.7 ppt PFOA reading, first surfaced through UCMR5 testing near the source in Hingham, describes what comes out of a Hull kitchen tap just as accurately as a Hingham one. That doesn't mean the utility is currently in violation — the compliance clock only started running once the rule was finalized, and the deadline (2029, or later if the extension proposal described in our newest update is finalized) hasn't arrived yet.
Source: Federal Register — PFAS National Primary Drinking Water Regulation.
We get some version of this question a lot: "Hull isn't Hingham — does any of this PFAS testing even apply to us?" The direct answer is yes, fully. Hull has no water intake, no wells, and no treatment plant of its own; every gallon that reaches a Hull tap has already passed through the Weir River Water System's Hingham-based treatment process and traveled the same distribution network before it gets here.
So the actual current status for Hull is exactly what it is for the rest of the system: EPA's UCMR5 testing round (2023–2025) detected five PFAS compounds, with PFOA at 5.7 ppt — above the EPA's 4 ppt individual health-based limit for that compound, though not an enforceable violation given the compliance timeline described above. Separately, EPA's SDWIS records show the system has recorded no health-based MCL violations of any kind since 2010. Both of those facts are true at once, and neither one is more or less "Hull's" than it is Hingham's or North Cohasset's — it's one number, for one shared system.
We're not going to manufacture urgency the data doesn't support, and we're not going to undersell it either: a legally compliant system can still have a compound reading above a federal health-based limit, and that's worth knowing plainly rather than buried in a regional CCR that most Hull residents never see.
Source: EPA UCMR5 occurrence data and EPA SDWIS, for the Weir River Water System. Full table on the Water data page.
Long before there was a federal PFAS rule, there was a Massachusetts one. In October 2020, MassDEP finalized an enforceable drinking water standard — a Maximum Contaminant Level, or MCL — of 20 parts per trillion for the combined total of six PFAS compounds, a grouping the state calls "PFAS6": PFOS, PFOA, PFHxS, PFNA, PFHpA, and PFDA.
At the time, this made Massachusetts one of a small number of states with any enforceable PFAS standard at all. The federal government wouldn't set its own limits for another three and a half years. That gap is part of why state-level standards like this one matter: they can move faster than federal rulemaking, and they're what actually governed Weir River's PFAS obligations for most of the 2020s — for the whole system, Hull's peninsula included.
This 20 ppt combined standard remains the operative Massachusetts rule today, and it's separate from (and less strict, compound-for-compound, than) the individual federal PFOA/PFOS limit of 4 ppt that followed in 2024. Both apply simultaneously to the Weir River Water System — it has to meet whichever is more protective for a given compound, regardless of which of its three member towns is asking.
Source: Mass.gov — Massachusetts PFAS Drinking Water Standard (MCL).
Hull is the odd one out among the towns we track: it's the only one that doesn't run its own water utility at all. Every other town in this project reads its own Consumer Confidence Report, tracks its own EPA monitoring data, and deals with its own local water department. Hull residents instead depend entirely on the Weir River Water System — a utility whose wells, treatment plant, and administrative home all sit across the town line in Hingham, and whose public communications, understandably, tend to speak to a Hingham audience first.
That's not a criticism of Hingham or of Aquarion Water Company — it's just a structural reality of sharing a regional system as the smaller of three partner towns. But it means Hull households have had to work slightly harder than most to find out what's actually in their tap water. We're launching this site to close that gap: the same EPA UCMR5 PFAS data (five compounds detected, including PFOA at a level above the EPA's individual health-based limit), the same violation-free record since 2010, and the same regulatory timeline — published with Hull, not Hingham, as the home audience. None of this represents a legal violation, and we're not going to pretend otherwise. It's simply the plain-language version of data that was always public, but never quite written with a Hull reader in mind. See the full breakdown on the Water data page.
System-wide data only tells part of the story — service lines, home plumbing, and private wells can all change what actually comes out of your tap.
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