Massachusetts drinking water compliance requirements in 2026 stack the strictest PFAS standard in New England on top of the federal Safe Drinking Water Act. If you operate one of Massachusetts's roughly 1,700 public water systems — the large majority of them small community and non-community systems run by a single part-time operator or a volunteer board — you answer to the Massachusetts Department of Environmental Protection (MassDEP) under 310 CMR 22.00, and the gap between what you think is due and what MassDEP is actually tracking is where violations start. Check your water system's compliance status free at orevant.com before you read on, then come back for the detail.
Who regulates you: MassDEP Drinking Water Program primacy
Massachusetts runs its own drinking water program. The MassDEP Drinking Water Program holds primacy under the federal SDWA, which means the state enforces both the federal baseline and its own requirements under the Massachusetts Drinking Water Regulations, 310 CMR 22.00. The practical effect for a small system is that the MassDEP inspector applies Massachusetts's rulebook on top of the federal one — and Massachusetts's system mix, dominated by small community groundwater systems and non-community systems, makes schedule-driven obligations like routine sampling and annual reports the most common failure point.
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PFAS: Massachusetts set a 20 ppt limit before the federal rule
Massachusetts moved on PFAS ahead of Washington. In 2020 the state adopted a maximum contaminant level of 20 nanograms per liter (parts per trillion) for the sum of six PFAS compounds — PFOS, PFOA, PFHxS, PFNA, PFHpA, and PFDA — applied to every public water system regardless of size, one of the strictest enforceable PFAS standards in the country at the time. The federal National Primary Drinking Water Regulation now layers on top: enforceable MCLs of 4 ppt for PFOA and PFOS, and 10 ppt each for PFHxS, PFNA, and HFPO-DA (GenX), with initial monitoring due by April 2027. A system must satisfy whichever limit is more stringent, and a detection above the applicable limit triggers public notification and, ultimately, treatment or a source change. See PFAS compliance deadlines for small water systems.
Lead service lines: old housing stock, the LCRI, and school testing
Every community water system must maintain a complete lead service line inventory (initial inventory required by the 2021 LCRR; the LCRI, finalized October 2024, extends it toward its November 1, 2027 compliance date) — initial submission was due October 16, 2024 under the 2021 LCRR, with annual updates after — and will lower the lead action level from 15 ppb to 10 ppb at the November 1, 2027 compliance date. Any line classified "unknown" is treated as lead until proven otherwise. Massachusetts carries some of the oldest housing stock in the country, concentrated in Boston and the former mill towns, where service line material records are frequently incomplete — so an incomplete inventory surfaces at your next sanitary survey as a significant deficiency. Massachusetts also runs a separate lead-in-school-drinking-water testing program, which adds a distinct reporting obligation for systems that serve schools and child care facilities. See lead service line inventory requirements under the LCRR.
Coliform, nitrate, and radionuclides: the routine monitoring burden
Under the Revised Total Coliform Rule, community systems serving 25 to 1,000 people must collect at minimum one routine total coliform sample per month, with repeat sampling within 24 hours of a positive result; missed or late samples are the most common monitoring violation in Massachusetts SDWIS data. Nitrate is capped at 10 mg/L (40 CFR 141.62), and systems drawing groundwater carry radionuclide obligations under 40 CFR 141.66 — combined radium-226/228 at 5 pCi/L, gross alpha at 15 pCi/L, and uranium at 30 µg/L. See radionuclides in drinking water and nitrate violation public notice.
CCR, AWIA, and the sanitary survey cycle
Community water systems must deliver a Consumer Confidence Report to every customer by July 1 each year — filing late is a direct violation, independent of water quality. Under AWIA, community systems serving more than 3,300 people must complete and certify a Risk and Resilience Assessment and maintain an updated Emergency Response Plan. MassDEP conducts sanitary surveys on a regular cycle, and a significant deficiency — an incomplete cross-connection control program, a lapsed operator certification, a missed monitoring period — comes with a corrective action clock, typically 120 days. See how to prepare for a state drinking water inspection.
How Orevant maps your Massachusetts obligations
Orevant reads your system's EPA SDWIS record and maps every applicable federal and Massachusetts requirement — PFAS6, lead service line inventory, coliform sampling, nitrate, radionuclides, CCR, and AWIA — onto a prioritized compliance roadmap, with each finding linked to the regulation it comes from. For a system in an active monitoring or violation cycle, the $87/mo monitoring keeps the sampling schedule, deadlines, and running trends on a calendar so the next exceedance is caught before it becomes a public notice. It is compliance information, not legal advice.
Check your Massachusetts water system — free at orevant.com (no account required).
Sources: 310 CMR 22.00 (Massachusetts Drinking Water Regulations); MassDEP Drinking Water Program; Massachusetts PFAS6 MCL (20 ppt, 2020); EPA National Primary Drinking Water Regulations (40 CFR 141.62, 141.66, 141.84, 141.202, 141.203); EPA PFAS NPDWR final rule (April 2024); EPA Lead and Copper Rule Improvements (October 2024); America's Water Infrastructure Act (2018); EPA SDWIS/ECHO public records.
FAQ
Is Massachusetts's PFAS limit stricter than the federal rule?
Yes, in practice. Massachusetts regulates six PFAS compounds at a combined 20 ppt, while the federal rule sets 4 ppt each for PFOA and PFOS. Your system must satisfy whichever limit is more stringent, and you should confirm the current value with MassDEP, as state standards can change. See PFAS compliance deadlines for small water systems.
Do we have separate obligations for lead in schools?
Massachusetts runs a lead-in-school-drinking-water testing program with its own sampling and reporting requirements for systems that serve schools and child care facilities, layered on top of the federal LCRI lead service line inventory. Confirm both schedules with MassDEP. See lead service line inventory requirements under the LCRR.
Our service line records are incomplete. What does that mean for compliance?
Under 40 CFR 141.84, a service line classified as unknown is treated as lead until proven otherwise, which triggers treatment-technique and replacement-planning obligations. An incomplete inventory also surfaces at your next sanitary survey as a significant deficiency. Massachusetts's older housing stock makes this a common exposure. See what happens when a water system fails an EPA sanitary survey.