PFAS in Maine drinking water
EPA's final UCMR 5 data covers 41 public water systems in Maine, serving about 533,990 people. PFAS turned up in 10 of them (24%). 4 averaged above at least one EPA limit at a sampling point, affecting about 51,031 people.
Highest PFOA and PFOS averages among systems serving 1,000 or more: Sanford Water District (6.2 / 6.2 ppt), Yarmouth Water District (8.2 / 0.0 ppt), Kennebec Water District (4.0 / 0.0 ppt) and Lisbon Water Department (2.1 / 0.0 ppt).
Every tested system in Maine
Largest first. PFOA and PFOS columns show the average at each system's worst sampling point; EPA's limit for each is 4 ppt. Filter by name:
| Water system | People | PFOA | PFOS | PFAS found | Result |
|---|---|---|---|---|---|
| Portland Water District-greater · Portland | 135,068 | - | - | 0 | None found |
| Maine Water Company Biddeford Saco Div · Poland | 42,508 | - | - | 0 | None found |
| Kennebunk, Kennebunkport & Wells WD · Kennebunk | 35,663 | - | - | 0 | None found |
| Bangor Water District · Bangor | 27,298 | - | - | 0 | None found |
| Lewiston Water & Sewer Division · Lewiston | 23,720 | - | - | 0 | None found |
| Kennebec Water District · Waterville | 22,060 | 4.0 | - | 4 | Above limit |
| Maine Water Company Camden & Rockland · Poland | 21,315 | - | - | 0 | None found |
| Brunswick / Topsham Water District · Topsham | 18,863 | - | - | 0 | None found |
| Auburn Water District · Lisbon | 17,245 | - | - | 0 | None found |
| Kittery Water District · Kittery | 14,478 | - | - | 0 | None found |
| Sanford Water District · Sanford | 14,328 | 6.2 | 6.2 | 7 | Above limit |
| Greater Augusta Utility District · Augusta | 13,750 | - | - | 0 | None found |
| York Water District · York | 13,675 | - | - | 0 | None found |
| Bath Water District · Bath | 9,205 | - | - | 0 | None found |
| Gardiner Water District · Gardiner | 9,000 | - | - | 2 | Below limits |
| Brewer Water Department · Brewer | 8,860 | - | - | 0 | None found |
| Boothbay Region Water District · Boothbay | 8,448 | - | - | 0 | None found |
| Yarmouth Water District · Yarmouth | 8,000 | 8.2 | - | 5 | Above limit |
| Old Town Water District · Old Town | 7,648 | - | - | 0 | None found |
| Lisbon Water Department · Lisbon | 6,643 | 2.1 | - | 5 | Above limit |
| Presque Isle Utilities District · Presque Isle | 6,128 | - | - | 0 | None found |
| Maine Water Company Skowhegan Division · Poland | 6,105 | - | - | 0 | None found |
| Orono-veazie Water District · Orono | 5,793 | - | - | 0 | None found |
| Belfast Water District · Belfast | 5,698 | - | - | 3 | Below limits |
| Anson and Madison Water District · Richmond | 5,568 | - | - | 0 | None found |
| Maine Water Company Millinocket Division · Poland | 5,400 | - | - | 0 | None found |
| Houlton Water Company · Houlton | 4,735 | - | 2.4 | 1 | Sample at limit |
| Hampden Water District · Hampden | 4,628 | - | - | 0 | None found |
| Town of Bar Harbor- Water Division · Bar Harbor | 4,443 | - | - | 2 | Below limits |
| Farmington Village Corp Water Dept · Farmington | 4,050 | - | - | 0 | None found |
| Rumford Water District · Rumford | 4,050 | - | - | 0 | None found |
| Caribou Utilities District · Caribou | 3,943 | - | - | 0 | None found |
| Ellsworth Water Department · Ellsworth | 3,910 | - | - | 0 | None found |
| South Berwick Water District · South Berwick | 3,722 | - | - | 0 | None found |
| Lake Arrowhead Community INC · North Waterboro | 3,500 | - | - | 0 | None found |
| Van Buren Water District · Van Buren | 2,190 | - | - | 0 | None found |
| Vinalhaven Water District · Poland | 1,053 | - | - | 0 | None found |
| Msad 06 Bonny Eagle Middle School | 800 | - | - | 1 | Below limits |
| Franklin Water Department · Franklin | 443 | - | - | 4 | Below limits |
| Saco River Apartments · Rowley | 30 | - | - | 0 | None found |
| Us Border Station-long Pond Rd-jackman · Lincoln | 26 | - | - | 0 | None found |
On a private well in Maine?
EPA's program only covers public systems. Private wells are never part of UCMR 5, so the only way to know is to test. Our well testing guide covers which lab tests to order, and the best well water systems covers what to install once you have results.
Cite this page
Well & Tap. "PFAS in Maine drinking water: results for 41 systems." Data: U.S. EPA UCMR 5, final release August 2026. https://wellandtap.com/pfas/maine/
Source: EPA UCMR 5 final occurrence data (August 2026); population from EPA SDWIS. Method.