How hard is the water in Maine?

The average water hardness across Maine is 53 PPM (3.1 GPG), classified as soft. Hardness varies by city - the hardest higher-confidence city page is Island Falls (222 PPM) and the softest is Andover (3 PPM).

What city in Maine has the hardest water?

Island Falls has the hardest water among higher-confidence Maine city pages at 222 PPM. A water softener is recommended for residents.

How many water systems are in Maine?

Maine has 387 active community water systems serving 388 cities.

Water Hardness in Maine

Average: 53 PPMSoft388 cities387 water systems

State data profile

How to read the Maine results

State pages are screening and comparison hubs. They summarize ZIP, city, and water-system patterns so you can find the local page that best matches your home or utility.

Direct or USGS-backed ZIPs

323 of 390

83% use treated-water records or USGS monitoring.

Estimated ZIP values

67 ZIPs

17% use nearby, county, or state-level fallback values.

Dataset update

March 9, 2026

Source coverage and rollups are rebuilt from the public dataset.

Use the source coverage below to judge how much local confirmation a specific city or ZIP needs. The methodology page explains the source hierarchy, weighting, and limitations.

State Average

53 PPM

Soft

Coverage

388 cities

387 water systems in the state rollup.

Data Source Coverage

ZIP-level source mix for Maine; higher direct and USGS coverage means less reliance on regional estimates.

390 ZIPs covered

Verified treated water

Utility, CCR, or state treated-water records

49%

192 ZIPs

High-confidence USGS

Environmental monitoring matched to local systems

34%

131 ZIPs

Estimated

Nearby, county, or state-level fallback values

17%

67 ZIPs

In Maine, 49% of ZIPs use verified treated-water records, 34% use high-confidence USGS monitoring, and 17% use estimates that should be confirmed locally for treatment decisions.

What the Data Shows in Maine

Most classified ZIPs in Maine are below the hard-water threshold, though local systems can still vary.

Maine uses a mixed data profile across treated-water records, USGS monitoring, and estimated fallback values.

Use the city table below to compare local results. For estimated locations or unusually high readings, confirm with your utility or a home hardness test before sizing treatment equipment.

ZIP Hardness Distribution

Soft77% (299)

Slightly Hard10% (40)

Moderately Hard3% (13)

Hard10% (38)

Very Hard0% (0)

Treatment Takeaway

Hardness treatment is less likely to be needed statewide, but local water systems can still differ from the state pattern. Test first if you see scale or spotting.

How to Use This Data

The source coverage is relatively strong in Maine, so these pages are useful for comparing local patterns before confirming your home's exact hardness.

Useful Maine City Pages

Shortcuts to city pages backed by more ZIP-code or water-system data.

Cities With More Local Data

Prioritize cities with multiple ZIPs and systems, then use source badges on each city page to separate verified treated-water records from estimates.

Top 10 Hardest Water Cities

#	City	Hardness
1	Island Falls	Hard (222 PPM)
2	Augusta	Hard (210 PPM)
3	Albion	Hard (210 PPM)
4	Belgrade	Hard (210 PPM)
5	Kents Hill	Hard (210 PPM)
6	Litchfield	Hard (210 PPM)
7	Manchester	Hard (210 PPM)
8	Mount Vernon	Hard (210 PPM)
9	North Monmouth	Hard (210 PPM)
10	Randolph	Hard (210 PPM)

Top 10 Softest Water Cities

#	City	Hardness
1	Andover	Soft (3 PPM)
2	Rangeley	Soft (3 PPM)
3	Stratton	Soft (3 PPM)
4	Derby	Soft (4 PPM)
5	Jackman	Soft (4 PPM)
6	Whiting	Soft (4 PPM)
7	Bath	Soft (6 PPM)
8	Boothbay	Soft (6 PPM)
9	Kingfield	Soft (6 PPM)
10	Madison	Soft (6 PPM)

All Cities in Maine

City pages marked Estimated use fallback values and should be confirmed with local testing or utility data.

Abbot VillageSoft ActonSoft AddisonSoft AlbionHard AlfredSoft AlnaSoft AndoverSoft AnsonSoft ArundelSoft AshlandHard AthensSoft AuburnSoft AugustaHard AuroraSoft Bailey IslandSoft BangorSoft Bar HarborSoft Bass HarborSoft BathSoft BealsSoft BelfastSlightly Hard BelgradeHard BenedictaSoft Benton StationSoft BernardSoft BerwickSoft BethelSlightly Hard BinghamSoft Birch HarborSoft Birch IslandSoft Blue HillSoft BoothbaySoft BowdoinhamSlightly Hard BradfordSoft BradleySoft BrewerSoft BridgewaterModerately Hard BridgtonSoft BristolSoft BrooklinSoft BrooksSoft BrooksvilleSoft BrooktonSoft BrownfieldSoft BrownvilleSlightly Hard Bryant PondSoft BuckfieldSoft BucksportSoft BurlingtonSoft BurnhamSlightly Hard CalaisSlightly Hard CambridgeSoft CamdenSoft CanaanSlightly Hard CantonSlightly Hard Cape ElizabethSoft Cape NeddickSoft Capitol IslandSoft CaratunkSoft CardvilleSoft CaribouHard CarmelSoft CascoSoft CastineSoft ChamberlainSoft CharlestonSoft Chebeague IslandSoft CherryfieldSoft Cliff IslandSoft ClintonHard Columbia FallsSoft CoreaSoft CorinnaSoft CornishSoft Cranberry IslesSoft Cumberland CenteSoft Cumberland ForesSoft CushingSoft CutlerSoft DamariscottaSoft DanforthSoft Deer IsleSoft DenmarkSoft DennysvilleSlightly Hard DerbySoft DetroitSoft DexterSoft DixfieldSlightly Hard DixmontSoft Dover FoxcroftSlightly Hard DresdenSoft DurhamSoft Eagle LakeHard East AndoverSoft East BaldwinSoft East BoothbaySoft East CorinthSoft East EddingtonSoft East HoldenSoft East MachiasSoft East MillinocketSoft East OrlandSoft East StonehamSoft East WaterboroSoft EastonHard EastportSlightly Hard EdgecombSoft EliotSoft EllsworthSoft EtnaSoft EustisSoft ExeterSoft FalmouthSoft FarmingdaleHard FarmingtonSoft Fort FairfieldModerately Hard Fort KentHard FrankfortSoft FranklinSoft FreedomSoft FreeportSoft FrenchboroSoft FrenchvilleHard FriendshipSoft FryeburgSoft GardinerHard GarlandSoft GorhamSoft GouldsboroSoft Grand IsleHard GraySoft GreeneSoft GreenvilleSoft Greenville JunctSoft GuilfordSlightly Hard HallowellHard HampdenSoft HancockSoft HanoverSoft HarborsideSoft HarringtonSoft HarrisonSoft HartlandSoft HebronSoft HiramSoft Hollis CenterSoft HopeSoft HoultonSlightly Hard HudsonSoft Island FallsHard Isle Au HautSoft IslesboroSoft IslesfordSoft JackmanSoft JaySlightly Hard JeffersonSoft JonesboroSoft JonesportSoft KenduskeagSoft KennebunkSoft KennebunkportSoft Kents HillHard Kezar FallsSoft KingfieldSoft KingmanSoft KitterySoft Kittery PointSoft LagrangeSoft LeeSoft LeedsSoft LevantSoft LewistonSoft LibertySoft LimerickSoft LimestoneHard LimingtonSoft LincolnSoft LincolnvilleSoft LisbonSoft Lisbon FallsSoft LitchfieldHard Little Deer IsleSoft LivermoreSoft Livermore FallsSoft Locke MillsSoft Long IslandSoft LovellSoft LubecSlightly Hard Mac MahanSoft MachiasSoft MachiasportSoft MadawaskaHard MadisonSoft ManchesterHard MapletonModerately Hard MaplewoodSoft Mars HillHard MatinicusSoft MattawamkeagSoft Mechanic FallsSoft MeddybempsSoft MedomakSoft MedwaySoft MexicoSlightly Hard MilbridgeSoft MilfordSoft MillinocketSoft MinotSoft MonheganSoft MonmouthHard MonroeSoft MonsonSoft MonticelloModerately Hard MorrillSlightly Hard Mount DesertSoft Mount VernonHard NaplesSoft New GloucesterSoft New HarborSoft New SharonSoft New SwedenModerately Hard New VineyardSoft NewcastleSoft NewportSoft NewrySoft NobleboroSoft NorridgewockSlightly Hard North AmitySoft North AnsonSoft North BerwickSoft North HavenSoft North MonmouthHard North New PortlaSoft North SebagoSoft North SullivanSoft North WaterboroSoft North WhitefieldSoft North YarmouthSoft Northeast HarborSoft NorwaySlightly Hard OakfieldSoft OaklandHard OgunquitSoft Old Orchard BeacSoft Old TownSoft OquossocSlightly Hard OrlandSoft OronoSoft OrringtonSoft Orrs IslandSoft Owls HeadSoft OxbowSlightly Hard OxfordSlightly Hard PalermoSoft PalmyraSlightly Hard PassadumkeagSoft PattenSoft Peaks IslandSoft PejepscotSoft PemaquidSoft PembrokeSlightly Hard PenobscotSoft PerhamModerately Hard PerrySlightly Hard PeruSoft PhillipsSlightly Hard PhippsburgSoft PittsfieldSlightly Hard PlymouthSoft Poland SpringSoft PortageModerately Hard PorterSoft PortlandSoft PownalSoft Presque IsleModerately Hard PrincetonSlightly Hard Prospect HarborSoft RandolphHard RangeleySoft RaymondSoft ReadfieldHard RichmondSlightly Hard RobbinstonSlightly Hard RocklandSoft RockportSoft RockwoodSoft Round PondSoft RoxburySoft RumfordSlightly Hard SabattusSoft SacoSoft Saint AgathaHard Saint AlbansSoft Saint DavidModerately Hard Saint FrancisHard SanfordSoft SangervilleSlightly Hard SargentvilleSoft ScarboroughSoft Seal CoveSoft Seal HarborSoft SearsmontSoft SearsportSlightly Hard SeboeisSoft SedgwickSoft ShapleighSoft Sherman MillsSoft Sherman StationSoft SinclairModerately Hard SkowheganSoft SmithfieldSoft Smyrna MillsSoft Soldier PondModerately Hard SolonSlightly Hard SorrentoSoft South BerwickSoft South BristolSoft South ChinaHard South HarpswellSoft South ParisSlightly Hard South PortlandSoft South ThomastonSoft Southwest HarborSoft SpringfieldSoft SpringvaleSoft Spruce HeadSoft StandishSoft Steep FallsSoft StetsonSoft SteubenSoft StockholmModerately Hard Stockton SpringsSlightly Hard StoningtonSlightly Hard StrattonSoft StrongSoft SunsetSoft SurrySoft Swans IslandSoft TempleSoft Tenants HarborSoft ThomastonSoft ThorndikeSoft TopsfieldSoft TroySoft TurnerSoft UnionSoft UnitySoft Van BurenHard VassalboroHard ViennaHard VinalhavenSoft WaldoboroSoft WalpoleSoft WarrenSoft WashburnHard WashingtonSoft WaterboroSoft WaterfordSoft WayneHard WeldSoft WellingtonSoft WellsSoft West BaldwinSoft West BowdoinSoft West BuxtonSoft West EnfieldSoft West ForksSoft West LebanonSoft West ParisSlightly Hard West SouthportSoft West SumnerSoft WestbrookSoft WestfieldModerately Hard WhitingSoft WiltonSoft WindhamSoft WindsorHard WinnSoft WinslowHard Winter HarborSoft WinterportSlightly Hard WinthropHard WiscassetSoft WoodlandSoft WoolwichSoft WytopitlockSoft YarmouthSoft YorkSoft