Maine tap water quality

386 active community water systems.

Largest water systems

GradeSystemPeopleHealth violations (5y)
APortland Water District-Greater135,0680
AMaine Water Company Biddeford Saco Div42,5080
AKennebunk, Kennebunkport & Wells WD35,6630
ABangor Water District27,2980
ALewiston Water & Sewer Division23,7200
AKennebec Water District22,0600
AMaine Water Company Camden & Rockland21,3150
ABrunswick/Topsham Water District18,8630
AAuburn Water District17,2450
AKittery Water District14,4780
CSanford Water District14,3280
AGreater Augusta Utility District13,7500
AYork Water District13,6750
ABath Water District9,2050
AGardiner Water District9,0000
ABrewer Water Department8,8600
ABoothbay Region Water District8,4480
CYarmouth Water District8,0000
AOld Town Water District7,6480
CLisbon Water Department6,6430
APresque Isle Utilities District6,1280
AMaine Water Company Skowhegan Division6,1050
AOrono-Veazie Water District5,7930
ABelfast Water District5,6980
BAnson and Madison Water District5,5680
AMaine Water Company Millinocket Division5,4000
AHampden Water District4,8000
AHoulton Water Company4,7350
ATown of Bar Harbor- Water Division4,4430
ARumford Water District4,0500
AFarmington Village Corp Water Dept4,0500
ACaribou Utilities District3,9430
DEllsworth Water Department3,9105
ASouth Berwick Water District3,7220
ABridgton Water District3,6600
ALake Arrowhead Community Inc3,5000
CPittsfield Water Dept3,2282
ALincoln Water District3,0200
BLivermore Falls Water District2,9951
AParis Utility District2,9400
AMaine Water Company Oakland Division2,8730
BBerwick Water Department2,8451
AWilton Water Department2,8000
BCalais Water Dept2,7751
ASearsport Water District2,7630
AWinthrop Utilities District2,7500
AMadawaska Water District2,7380
AMaine Water Company Freeport Division2,7000
BSouthwest Harbor Water & Sewer District2,4800
CGray Water District2,4682

Most issues (systems serving 10,000+)

C

Sanford Water District

Serves 14,328 people · Groundwater · Full report →
No health-based violations in the last 5 years; PFOA/PFOS average above the 4 ppt federal limit: PFOS, PFOA; Lead 90th percentile below the action level (2023).
A

Portland Water District-Greater

Serves 135,068 people · Surface water · Full report →
No health-based violations in the last 5 years; 4 monitoring/reporting violations; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2023).
A

Kennebec Water District

Serves 22,060 people · Surface water · Full report →
No health-based violations in the last 5 years; 3 monitoring/reporting violations; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2024).
A

Bangor Water District

Serves 27,298 people · Surface water · Full report →
No health-based violations in the last 5 years; 2 monitoring/reporting violations; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2025).
A

Maine Water Company Camden & Rockland

Serves 21,315 people · Surface water · Full report →
No health-based violations in the last 5 years; 2 monitoring/reporting violations; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2025).
A

Greater Augusta Utility District

Serves 13,750 people · Groundwater · Full report →
No health-based violations in the last 5 years; 2 monitoring/reporting violations; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2025).
A

Kennebunk, Kennebunkport & Wells WD

Serves 35,663 people · Surface water · Full report →
No health-based violations in the last 5 years; 1 monitoring/reporting violation; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2023).
A

Maine Water Company Biddeford Saco Div

Serves 42,508 people · Surface water · Full report →
No health-based violations in the last 5 years; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2024).
A

Lewiston Water & Sewer Division

Serves 23,720 people · Surface water · Full report →
No health-based violations in the last 5 years; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2023).
A

Brunswick/Topsham Water District

Serves 18,863 people · Groundwater · Full report →
No health-based violations in the last 5 years; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2025).
A

Auburn Water District

Serves 17,245 people · Surface water · Full report →
No health-based violations in the last 5 years; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2023).
A

Kittery Water District

Serves 14,478 people · Surface water · Full report →
No health-based violations in the last 5 years; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2025).
A

York Water District

Serves 13,675 people · Surface water · Full report →
No health-based violations in the last 5 years; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2025).

Cities

AbbotAddisonAlfredAltonAndoverAnsonArundelAshlandAuburnAugustaAvonBaileyvilleBangorBar HarborBathBealsBelfastBelgradeBelmontBentonBerwickBethelBiddefordBiddeford PoolBinghamBlue HillBoothbayBoothbay HarborBowdoinBowdoinhamBradleyBrewerBridgtonBristolBrooksBrownvilleBrownville JunctionBrunswickBuckfieldBucksportBurnhamBuxtonCalaisCamdenCantonCape ElizabethCaratunkCaribouCarmelCarrabassett VlCascoCastineCaswellCharlestonChelseaCherryfieldChestervilleChinaCliftonClintonColumbiaColumbia FallsCoplin PltCorinnaCorinthCornishCumberlandCumberland CenterDallas PltDamariscottaDanforthDeer IsleDennysvilleDexterDixfieldDover FoxcroftDover-FoxcroftDresdenDurhamEagle LakeEast BoothbayEast LivermoreEast MachiasEast MillinocketEast NewportEast OrlandEast WaterboroEast WiltonEast WinthropEastonEastportEddingtonEliotEllsworthEmbdenEtnaEustisExeterFairfieldFalmouthFarmingdaleFarmingtonFarmington FallsFort FairfieldFort KentFranklinFreeportFrenchvilleFriendshipFryeburgGardinerGlenburnGorhamGrand IsleGrand Lake StreamGrayGreenbushGreeneGreenvilleGreenville JunctionGreenwoodGuilfordHallowellHampdenHancockHarpswellHarringtonHarrisonHartlandHebronHermonHinckleyHiramHodgdonHoldenHollisHollis CenterHopeHoultonHowlandHulls CoveIndian Twp St Ind RsIsland FallsIsle Au HautJackmanJayJonesportKenduskeagKennebunkKennebunkportKingfieldKitteryKittery PointLagrangeLamoineLebanonLeedsLevantLewistonLibertyLimerickLimestoneLimingtonLincolnLincolnvilleLisbonLisbon FallsLitchfieldLivermoreLivermore FallsLubecLymanMachiasMachiasportMadawaskaMadisonManchesterMapletonMars HillMattawamkeagMechanic FallsMexicoMilbridgeMilfordMillinocketMiloMonmouthMonsonMonticelloMontvilleMorrillMoscowMount DesertMount VernonNaplesNew GloucesterNew PortlandNew SharonNew SwedenNewburgNewcastleNewportNorridgewockNorth AnsonNorth BerwickNorth BridgtonNorth HavenNorth VassalboroNorth WaterboroNorth YarmouthNortheast HarborNorthportNorwayOakfieldOaklandOcean ParkOgunquitOld Orchard BeachOld TownOquossocOronoOrringtonOwls HeadOxfordPalmyraParisParkmanParsonsfieldPassadumkeagPattenPeaks IslandPembrokePenobscotPerryPhillipsPhippsburgPittsfieldPittstonPlymouthPolandPort ClydePorterPortlandPresque IslePrincetonRandolphRangeleyRangeley PltRaymondReadfieldRichmondRocklandRockportRumfordSabattusSacoSaint AgathaSaint FrancisSandy River PltSanfordSangervilleScarboroughSearsportSebagoSebecSedgwickShapleighShawmutSkowheganSmithfieldSolonSorrentoSouth BerwickSouth ChinaSouth ParisSouth PortlandSouth ThomastonSouthportSouthwest HarborSouthwest HbrSpringvaleSt AgathaSt FrancisSt GeorgeStacyvilleStandishStarksSteep FallsStetsonStillwaterStockton SpringsStoningtonStrongSurrySwanvilleTempleTenants HarborThomastonTopshamTrevettTurnerUnionUnityVan BurenVassalboroVeazieVinalhavenWaldoboroWalesWallagrassWarrenWashburnWaterboroWatervilleWellsWest BathWest Boothbay HarborWest FarmingtonWest ForksWest ParisWestbrookWiltonWindhamWindsorWinnWinslowWinter HarborWinterportWinthropWiscassetWoolwichYarmouthYorkYork BeachYork Harbor