Maine tap water quality
386 community water systems serving 691,894 people.
Data: U.S. EPA · How we read the data · How we check it
PFAS: EPA's 2023–2025 testing. Lead: results from the last five years.
Water systems with PFAS above the federal limit
Based on EPA's UCMR 5 results (2023–2025) compared to the April 2024 limits, the way EPA compares them. Systems have until 2029 to comply. Largest first.
- Sanford Water District14,328 people · Groundwater · MainePFOA above limitAlso: PFOS above limit · PFHxS detected
- Yarmouth Water District8,000 people · Groundwater · MainePFOA above limit
Maine PFAS report: chart, rankings and data to download →
Maine's own PFAS limits
Maine enforces its own drinking water limits for PFAS (effective: 2021-06): the sum of PFOA + PFOS + PFHxS + PFNA + PFHpA + PFDA at 20 ppt. The federal limits are 4 ppt for PFOA and PFOS.
Interim standard (alone or combined) per 2021 law. It stays in effect until 2027-04-26, when federal MCLs adopted by reference in 10-144 CMR Ch. 231 take over.
Source: Maine CDC Drinking Water Program: PFAS in Public Water Systems, checked 2026-11-14. Utility pages compare each system's EPA results with these limits. State compliance is judged on the state's own sampling.
Largest water systems in Maine
- Portland Water District – Greater135,068 people · Surface water · MaineNo PFAS above limits
- Maine Water Company Biddeford Saco Division42,508 people · Surface water · MaineNo PFAS above limitsAlso: 1 health-based violation since 2016
- Kennebunk, Kennebunkport & Wells Water District35,663 people · Surface water · MaineNo PFAS above limits
- Bangor Water District27,298 people · Surface water · MaineNo PFAS above limits
- Lewiston Water & Sewer Division23,720 people · Surface water · MaineNo PFAS above limits
- Kennebec Water District22,060 people · Surface water · MainePFOA detected
- Maine Water Company Camden & Rockland21,315 people · Surface water · MaineNo PFAS above limits
- Brunswick/Topsham Water District18,863 people · Groundwater · MaineNo PFAS above limits
- Auburn Water District17,245 people · Surface water · MaineNo PFAS above limits
- Kittery Water District14,478 people · Surface water · MaineNo PFAS above limits
- Sanford Water District14,328 people · Groundwater · MainePFOA above limitAlso: PFOS above limit · PFHxS detected
- Greater Augusta Utility District13,750 people · Groundwater · MaineNo PFAS above limits
- York Water District13,675 people · Surface water · MaineNo PFAS above limits
- Bath Water District9,205 people · Surface water · MaineNo PFAS above limits
- Gardiner Water District9,000 people · Groundwater · MainePFHxS detected
Maine cities and towns
Most health-based violations since 2016
- Mars Hill and Blaine Water Company1,500 people · Groundwater · MaineHaloacetic acids (HAA5) violationsAlso: Total trihalomethanes (TTHM) violations
- Unity By the Stream LLC88 people · Groundwater · MaineArsenic violations
- Long Pond Water District308 people · Surface water · MaineTotal trihalomethanes (TTHM) violations
- US Coast Guard Station-Jonesport Water System25 people · Groundwater under influence of surface water · MaineTotal trihalomethanes (TTHM) violationsAlso: Haloacetic acids (HAA5) violations
- Raymond Woods Townhouses Water System50 people · Groundwater · MaineGross alpha violationsAlso: Radium (combined 226/228) violations
- Crystal Spring Estates Water System65 people · Groundwater · MaineArsenic violations
- Sugarloaf Water Association1,730 people · Surface water · MaineHaloacetic acids (HAA5) violations
- Loring Development Authority180 people · Surface water · MaineTotal trihalomethanes (TTHM) violations
- Stonington Water Company683 people · Groundwater · MaineGross alpha violationsAlso: Total trihalomethanes (TTHM) violations · Coliform bacteria violation
- Jay Village Water District975 people · Purchased surface water · MaineTotal trihalomethanes (TTHM) violationsAlso: Haloacetic acids (HAA5) violations
- Southwest Harbor Water & Sewer District2,480 people · Surface water · MaineTotal trihalomethanes (TTHM) violations
- Vinalhaven Water District1,053 people · Surface water · MaineTotal trihalomethanes (TTHM) violations
- Passamaquoddy Water District2,125 people · Surface water · MaineTotal trihalomethanes (TTHM) violations
- Three Rivers M H Community Water System63 people · Groundwater · MaineArsenic violationsAlso: Coliform bacteria violation
- Stonington Manor Water System44 people · Groundwater · MaineUranium violations
All Maine utilities on this site
Every Maine system serving 50,000+ people or with PFAS above a federal limit, A to Z. Download all 386 systems as CSV.
Questions
Does Maine tap water have PFAS?
EPA tested 39 community water systems in Maine for 29 PFAS between 2023 and 2025. 7 had at least one regulated PFAS detected, and 2 had an entry-point average above a 2024 federal limit. Those 2 systems serve about 22,328 people (3% of people on community water in Maine). Systems have until 2029 to meet the limits.
How many Maine water systems have violations?
92 systems in Maine had at least one health-based violation since 2016 (358 violations in total). 177 violations are currently listed as unaddressed.
Which Maine water systems are over the lead action level?
1 system had a lead 90th percentile above the 15 ppb action level in their most recent results from the last five years. Lead depends on each home's pipes, so a test of your own tap is the only way to know your level.
Source: U.S. EPA drinking water records and PFAS testing (UCMR 5). How we read the data.