We're launching this initiative at an unusually well-timed moment: on July 6, 2026, the brand-new Tri-Town Regional Water Treatment Plant began blending its output into Braintree's distribution system for the first time. The plant replaces two aging, separate 1930s-era facilities — one on Braintree's side of Great Pond, one on the Randolph/Holbrook side — with a single, modern regional plant built specifically with enhanced PFAS removal in mind. The blending transition is expected to take about a month, and residents may notice temporary changes in taste, odor, pressure, or clarity in the meantime; officials say the water will continue to meet all state and federal standards throughout.
We think this is exactly the kind of moment a plain-language, independent source is useful for: a real, current infrastructure change that most households will only hear about secondhand, if at all. We'll track how the new plant's performance shows up in future testing data as it becomes available. In the meantime, see our Water data page for the current numbers from Braintree's outgoing system.
Sources: Braintree Water & Sewer Department; Randolph/Holbrook Joint Water Board public notices, July 2026.
On May 18, 2026, EPA announced two proposals that affect the federal PFAS rule we describe 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 two Braintree's own 2023–2024 UCMR5 testing detected above that level (7.6 ppt PFOS, 4.7 ppt PFOA on average) — 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.
EPA held a public hearing on the proposals on July 7, 2026, and the public comment period remains open through July 20, 2026, with neither proposal finalized as of this writing. 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 Braintree specifically, this is the rule that turned an already-known number into a compliance question: the system's UCMR5 testing found PFOA averaging 4.7 ppt and PFOS averaging 7.6 ppt, both above this new 4 ppt limit. 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. The new Tri-Town Regional Water Treatment Plant coming online this month was designed in part with exactly this kind of PFAS removal in mind.
Source: Federal Register — PFAS National Primary Drinking Water Regulation.
Cutting through the regulatory back-and-forth, here's what the current public data actually shows for Braintree specifically. Under the Massachusetts PFAS6 standard — the combined limit for six PFAS compounds, capped at 20 parts per trillion based on a running annual average — Braintree's 2025 average was 19.24 ppt, below the state limit. That is not a violation. One individual monthly sample did reach 20.69 ppt, above the 20 ppt line, but Massachusetts judges compliance on the four-quarter average, not any single month.
Separately, under EPA's UCMR5 monitoring program (which doesn't carry an enforceable limit of its own, but is what fed into the 2024 federal rule), Braintree's 2023–2024 testing found PFOA averaging 4.7 ppt and PFOS averaging 7.6 ppt — both above the federal government's own 4 ppt individual health-based limit for those two compounds specifically. Every sample in each compound's range, including the low end, came in at or above 4 ppt.
We're stating this plainly because it's what the data shows, not because it's the most dramatic way to frame it: Braintree is in compliance with the enforceable standard that currently governs it (the state's 20 ppt combined PFAS6 limit), while also showing PFOA and PFOS levels above the newer federal individual limit whose compliance deadline hasn't arrived yet. Both things are true at once. See the full tables on our Water data page.
Source: Braintree Water & Sewer 2025 Consumer Confidence Report; EPA UCMR5 occurrence data, 2023–2024.
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 Braintree's PFAS obligations for most of the 2020s.
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 — a system has to meet whichever is more protective for a given compound. For Braintree's Great Pond system, that means passing the state's combined test today while working toward the newer, tighter federal individual limits ahead of their compliance deadline.
Source: Mass.gov — Massachusetts PFAS Drinking Water Standard (MCL).
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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