Water in Massachusetts.
Greater Boston drinks pristine Quabbin Reservoir water — among the highest-quality municipal source water in the country. Yet Massachusetts' colonial-era and post-war housing stock means lead-in-water exposure remains significant in many communities. PFAS contamination affects multiple Cape Cod systems.
How Massachusetts regulates drinking water.
Among the strictest states. Massachusetts MCL of 20 ng/L combined for six PFAS compounds (2020). State School Lead-in-Water Program operational since 2016.
Massachusetts Department of Environmental Protection — Drinking Water Program
Massachusetts's water history, in order.
The contamination events, regulatory shifts, and major settlements that define how this state thinks about drinking water today.
- 2016
Massachusetts launches one of the first state-mandated school lead-in-water testing programs.
- 2020
State sets MCL of 20 ng/L combined for six PFAS compounds.
- 2023
Cape Cod-wide PFAS testing identifies multiple military-source contamination zones.
The actual water you drink.
The physical rivers, aquifers, lakes, and reservoirs that feed Massachusetts's public water systems. Source quality is the foundation of tap quality — and where the long-term protection fights happen.
- reservoirQuabbin Reservoir + Wachusett Reservoir
MWRA system — among the best municipal source water in the U.S.
- riverConnecticut River
Western MA cities.
- aquiferPlymouth-Carver Aquifer
Cape Cod / southeastern MA.
Source-water mix
~70% surface water (Quabbin), ~30% groundwater
Major cities served
Boston · Worcester · Springfield · Cambridge · Lowell
Who actually serves the water.
The largest public water systems in Massachusetts by population served. Click your ZIP after to see the full live EWG report for your specific utility.
- Massachusetts Water Resources AuthorityBoston metro / Quabbin2,500Kserved
- Springfield Water and Sewer CommissionSpringfield250Kserved
- Worcester Department of Public WorksWorcester200Kserved
Where the contamination comes from.
Every state has a different industrial fingerprint. The industries below are the dominant historical and active contamination sources in Massachusetts's drinking water systems.
Joint Base Cape Cod PFAS plume affects multiple Cape Cod communities. Massachusetts Military Reservation has decades of groundwater plume monitoring. Legacy manufacturing in Lowell, Lawrence, Springfield drove industrial-solvent contamination.
What state data flags most consistently.
Drawn from EPA SDWIS sampling records, EWG state summaries, and regional regulatory action over the past five years. Read the full deep dive on each.
Lead
A neurotoxic metal that leaches from old pipes and solder. No safe level for children.
PFAS (Forever Chemicals)
A class of ~15,000 synthetic chemicals that don't break down. Now regulated for the first time.
Trihalomethanes (TTHMs)
Byproducts of chlorinating water. Linked to bladder cancer at chronic exposure.
Chromium-6 (Hexavalent Chromium)
The Erin Brockovich chemical. A known carcinogen with no federal-specific limit yet.
Risk isn't evenly distributed.
Boston-area residents in pre-1986 colonial-era housing face lead from older service lines. Cape Cod households near former military bases face PFAS.
~13% on private wells. Cape Cod and Western Massachusetts have the most documented private-well PFAS.
What's coming for Massachusetts's water.
Cape Cod sole-source aquifer faces saltwater intrusion from sea-level rise. Coastal storm intensity affects southeastern MA treatment plants. Increasing harmful algal bloom risk in Connecticut River.
Statewide mandate
MA Department of Environmental Protection runs Assistance Program for Lead in School Drinking Water since 2016 — voluntary participation but with mandatory reporting once tested. Most public schools have tested.
Five questions for your next Consumer Confidence Report.
Your utility is required to send you a Consumer Confidence Report annually. Most are dense and procedural. These are the questions worth following up on for Massachusetts specifically.
- 1
If I'm on Cape Cod, is my well in the Joint Base Cape Cod PFAS plume?
- 2
Has my MWRA-served community received its annual TTHM update?
- 3
Where are my school's lead test results posted?
Most state regulators allow public records requests for the underlying lab reports behind your CCR — your utility should be able to provide them on request.
What's changed in Massachusetts water law.
Drinking water regulation moves at the state level as much as the federal level. Below are notable recent bills and regulatory actions specific to Massachusetts.
- 2022
PFAS Trust Fund Act — establishes state PFAS remediation funding.
- 2020
MA PFAS MCL of 20 ng/L combined for six compounds.
For lead: NSF/ANSI 53 carbon block. For Cape Cod PFAS: NSF/ANSI P473 or reverse osmosis.
We don't recommend brands — the NSF/ANSI certification number matters more than the name on the box.
This is the state. Your address is the answer.
State-level patterns don't tell you about your specific tap. Run your ZIP for the live EWG contaminant report on your utility — or build a personalized Water File for your household.
Source-water mix, utility counts, lead-service-line estimates, and private-well shares are approximate, drawn from EPA SDWIS public data and state primacy-agency summaries. Contaminant rankings reflect EWG state-level monitoring data and regional regulatory action — they are not exhaustive. Timeline events are publicly documented. See methodology for the full sourcing. Search EPA SDWIS for Massachusetts