We're kicking off this initiative with the issue that actually generates the most complaints in this town: discolored tap water. Pembroke's five wells sit in ground naturally rich in iron and manganese — the same minerals that once fed the pond-and-bog network supporting over a dozen cranberry growers around Bryantville. That geology is a feature for the bogs and a headache for household plumbing: sediment stirred loose by routine flushing, fire-flow testing, and main breaks can turn tap water visibly brown.
In December 2024, the town's Water Superintendent presented a $75 million, multi-year plan to replace aging water main and cut down on these events, aiming for a noticeable improvement within about three years. The DPW's own position is that this is "an aesthetic concern... not a health concern" — a characterization we think is worth reporting plainly, alongside the fact that residents tracking their own households counted a dozen or more discoloration events in 2024 alone. See the full breakdown on our Water data page.
Source: Town of Pembroke Water Division public statements; South Shore News and NBC Boston reporting on the December 2024 infrastructure plan.
Unlike some neighboring systems where PFOA or PFOS has turned up above a legal limit, no public source we reviewed for Pembroke reports either of those two compounds detected at all. One aggregator tracking EPA's UCMR5 testing (2023–2025) reports two other, unregulated compounds — PFHxA at roughly 4.8 ppt and PFPeA at roughly 5.7 ppt — while a second aggregator and a summary of the town's own Consumer Confidence Report indicate no PFAS detections whatsoever.
We're stating this plainly rather than picking whichever version sounds more alarming: even under the more conservative (detection-reporting) source, neither compound found carries an individual enforceable limit under Massachusetts' PFAS6 standard or the 2024 federal rule, and neither is PFOA or PFOS. If you want the fullest picture, our Water data page lays out exactly where the sources disagree and how to check the primary data yourself.
Source: EPA Fifth Unregulated Contaminant Monitoring Rule (UCMR5) occurrence data as aggregated by public tap-water trackers; Pembroke Water Division Consumer Confidence Report summaries.
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. For Pembroke specifically, public data doesn't show the system anywhere near this 20 ppt combined threshold — the two compounds one tracker does report, PFHxA and PFPeA, aren't even part of the six compounds this standard covers.
Source: Mass.gov — Massachusetts PFAS Drinking Water Standard (MCL).
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. For Pembroke, this is the rule that would matter most if PFOA or PFOS ever turned up in testing — so far, no public source reports that they have.
Source: Federal Register — PFAS National Primary Drinking Water Regulation.
On May 18, 2026, EPA announced two proposals affecting the federal PFAS rule described above. 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 rulemaking didn't follow required Safe Drinking Water Act procedure.
What doesn't change: the 4 ppt limits for PFOA and PFOS individually — the two compounds most consistently linked to health effects in research — aren't part of either rescission proposal. EPA held a public hearing on the proposals on July 7, 2026, and the comment period is scheduled to close July 20, 2026, with EPA aiming to finalize before the end of 2026. Nothing here is final yet, and since no public data shows PFOA or PFOS detected in Pembroke's water in the first place, this mostly matters for keeping an eye on how the rule evolves nationally.
See the full regulatory timeline for how this fits with the 2020 state standard and the 2024 federal rule.
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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