All 34 systems had enough required samples to calculate a yearly average. 2 had at least one yearly average at or above a study benchmark; 32 did not.
EPA-based study benchmark: the unrounded cutoff this research uses to reproduce EPA’s January 2026 technical-assistance classification around the April 2024 federal levels. It is not a current standard or compliance finding and cannot determine household exposure or health risk.
Find your water system
ZIP codes are used only to route visitors to public water systems that reported serving them. Confirm the actual provider using a water bill or utility record.
System counts in Maine
Each count shows how many included water systems had a yearly average at or above the named study benchmark.
| Study benchmark | Systems at or above benchmark | Water systems included | Percent |
|---|---|---|---|
| PFOA: 4.05 ppt study benchmark (reproduces EPA classification around 4 ppt) | 2 | 34 | 5.9% |
| PFOS: 4.05 ppt study benchmark (reproduces EPA classification around 4 ppt) | 1 | 34 | 2.9% |
| PFHxS: 15 ppt study benchmark (reproduces EPA classification around 10 ppt) | 0 | 34 | 0.0% |
| PFNA: 15 ppt study benchmark (reproduces EPA classification around 10 ppt) | 0 | 34 | 0.0% |
| HFPO-DA: 15 ppt study benchmark (reproduces EPA classification around 10 ppt) | 0 | 34 | 0.0% |
| Hazard Index: 1.5 study benchmark with at least two detected components (reproduces EPA classification around 1) | 0 | 34 | 0.0% |
Community water systems with complete monitoring
“Complete monitoring” means at least one sampling location had all required samples needed for a yearly average. Each PWSID appears once, preventing double counting across ZIP associations.
| Public water system | PWSID | Population served | Primary source | Sampling locations | Study benchmark result |
|---|---|---|---|---|---|
| ANSON AND MADISON WATER DISTRICT | ME0090930 | 5,568 | Surface water | 2 | Below all study benchmarks |
| AUBURN WATER DISTRICT, ME | ME0090070 | 17,245 | Surface water | 1 | Below all study benchmarks |
| BANGOR WATER DISTRICT | ME0090110 | 27,298 | Surface water | 1 | Below all study benchmarks |
| BELFAST WATER DISTRICT | ME0090140 | 5,698 | Ground water | 2 | Below all study benchmarks |
| BOOTHBAY REGION WATER DISTRICT | ME0090200 | 8,448 | Surface water | 1 | Below all study benchmarks |
| BREWER WATER DEPARTMENT | ME0090220 | 8,860 | Surface water | 1 | Below all study benchmarks |
| BRUNSWICK / TOPSHAM WATER DISTRICT | ME0090260 | 18,863 | Ground water | 3 | Below all study benchmarks |
| CARIBOU UTILITIES DISTRICT | ME0090320 | 3,943 | Ground water | 1 | Below all study benchmarks |
| ELLSWORTH WATER DEPARTMENT | ME0090520 | 3,910 | Surface water | 1 | Below all study benchmarks |
| FARMINGTON VILLAGE CORP WATER DEPT | ME0090540 | 4,050 | Ground water | 2 | Below all study benchmarks |
| FRANKLIN WATER DEPARTMENT, ME | ME0090570 | 443 | Ground water | 1 | Below all study benchmarks |
| GARDINER WATER DISTRICT | ME0090610 | 9,000 | Ground water | 1 | Below all study benchmarks |
| GREATER AUGUSTA UTILITY DISTRICT | ME0090080 | 13,750 | Ground water | 1 | Below all study benchmarks |
| HAMPDEN WATER DISTRICT | ME0090660 | 4,628 | Surface water purchased | 3 | Below all study benchmarks |
| HOULTON WATER COMPANY | ME0090700 | 4,735 | Ground water | 2 | Below all study benchmarks |
| KENNEBEC WATER DISTRICT | ME0090750 | 22,060 | Surface water | 1 | Below all study benchmarks |
| KENNEBUNK, KENNEBUNKPORT & WELLS WD | ME0090760 | 35,663 | Surface water | 5 | Below all study benchmarks |
| KITTERY WATER DISTRICT | ME0090790 | 14,478 | Surface water | 1 | Below all study benchmarks |
| LEWISTON WATER & SEWER DIVISION | ME0090830 | 23,720 | Surface water | 1 | Below all study benchmarks |
| LISBON WATER DEPARTMENT | ME0090870 | 6,643 | Ground water | 4 | Below all study benchmarks |
| MAINE WATER COMPANY BIDDEFORD SACO DIV | ME0090170 | 42,508 | Surface water | 1 | Below all study benchmarks |
| MAINE WATER COMPANY CAMDEN & ROCKLAND | ME0090300 | 21,315 | Surface water | 1 | Below all study benchmarks |
| MAINE WATER COMPANY MILLINOCKET DIVISION | ME0090990 | 5,400 | Surface water | 1 | Below all study benchmarks |
| MAINE WATER COMPANY SKOWHEGAN DIVISION | ME0091450 | 6,105 | Surface water | 1 | Below all study benchmarks |
| OLD TOWN WATER DISTRICT | ME0091200 | 7,648 | Ground water | 1 | Below all study benchmarks |
| ORONO-VEAZIE WATER DISTRICT | ME0091210 | 5,793 | Ground water | 1 | Below all study benchmarks |
| PORTLAND WATER DISTRICT-GREATER | ME0091300 | 135,068 | Surface water | 1 | Below all study benchmarks |
| RUMFORD WATER DISTRICT | ME0091380 | 4,050 | Ground water | 2 | Below all study benchmarks |
| SACO RIVER APARTMENTS | ME0092710 | 30 | Ground water | 1 | Below all study benchmarks |
| SANFORD WATER DISTRICT | ME0091410 | 14,328 | Ground water | 6 | At or above a study benchmark |
| TOWN OF BAR HARBOR- WATER DIVISION | ME0090120 | 4,443 | Surface water | 1 | Below all study benchmarks |
| VAN BUREN WATER DISTRICT | ME0091540 | 2,190 | Ground water | 1 | Below all study benchmarks |
| YARMOUTH WATER DISTRICT | ME0091670 | 8,000 | Ground water | 4 | At or above a study benchmark |
| YORK WATER DISTRICT | ME0091680 | 13,675 | Surface water | 1 | Below all study benchmarks |
What is included
Each active community water system with enough required samples for a yearly average is counted once, even if it is linked with several ZIP codes. This does not mean every home was tested. Private wells are excluded, and UCMR 5 did not comprehensively monitor every small system. This page does not apply Maine's state-specific standards or determine compliance. Use the official state or territory drinking-water program for current regulatory information.