Water Hardness in Oregon
Average: 47 PPMSoft358 cities934 water systems
State report
Is Oregon Water Hard or Soft?
Oregon water is soft on average at 47 PPM (2.8 GPG). Local readings can vary by utility, aquifer, treatment plant, and private well use.
State average
47 PPM
Soft
Local coverage
358 cities
934 water systems
Source profile
251 ZIPs
direct or USGS-backed
Oregon has mixed source coverage across treated-water records, USGS monitoring, and estimated fallback values.
State data profile
How to read the Oregon 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
251 of 400
63% use treated-water records or USGS monitoring.
Estimated ZIP values
149 ZIPs
37% 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
47 PPM
Soft
Coverage
358 cities
934 water systems in the state rollup.
Data Source Coverage
ZIP-level source mix for Oregon; higher direct and USGS coverage means less reliance on regional estimates.
400 ZIPs covered
Verified treated water
Utility, CCR, or state treated-water records
46%
184 ZIPs
High-confidence USGS
Environmental monitoring matched to local systems
17%
67 ZIPs
Estimated
Nearby, county, or state-level fallback values
37%
149 ZIPs
In Oregon, 46% of ZIPs use verified treated-water records, 17% use high-confidence USGS monitoring, and 37% use estimates that should be confirmed locally for treatment decisions.
What the Data Shows in Oregon
Most classified ZIPs in Oregon are below the hard-water threshold, though local systems can still vary.
Oregon 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
Soft80% (320)
Slightly Hard14% (54)
Moderately Hard5% (19)
Hard1% (2)
Very Hard1% (5)
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
Use the source coverage above to decide how much local confirmation you need for a specific city or ZIP code.
Source-Backed Water Systems in Oregon
Large systems with treated-water reports or USGS monitoring behind the state rollup.
| Water system | Hardness | Source label | Population |
|---|---|---|---|
| Manna House Church OR4101267 - Multnomah County | 12 PPM Soft | Annual Water Quality Report Verified - Annual Water Quality Report | 300 |
| Rocky Pointe Marina OR4101251 - Multnomah County | 12 PPM Soft | Annual Water Quality Report Verified - Annual Water Quality Report | 125 |
| Seavey Loop Water Company OR4100289 - Lane County | 12 PPM Soft | Annual Water Quality Report Verified - Annual Water Quality Report | 110 |
| Sauvie Island Moorage OR4101209 - Multnomah County | 12 PPM Soft | Annual Water Quality Report Verified - Annual Water Quality Report | 96 |
| Mccuddys Landing OR4106090 - Columbia County | 12 PPM Soft | Annual Water Quality Report Verified - Annual Water Quality Report | 70 |
| Mayfair Moorage Inc OR4101258 - Multnomah County | 12 PPM Soft | Annual Water Quality Report Verified - Annual Water Quality Report | 30 |
| Big Oak Marina OR4106054 - Multnomah County | 12 PPM Soft | Annual Water Quality Report Verified - Annual Water Quality Report | 30 |
| Robbins Nest Residential Park OR4195304 - Coos County | 12 PPM Soft | Annual Water Quality Report Verified - Annual Water Quality Report | 27 |
Useful Oregon 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 | Hermiston | Moderately Hard (133 PPM) |
| 2 | Pendleton | Moderately Hard (131 PPM) |
| 3 | The Dalles | Slightly Hard (86 PPM) |
| 4 | Wamic | Slightly Hard (85 PPM) |
| 5 | Ontario | Slightly Hard (79 PPM) |
| 6 | Newberg | Slightly Hard (63 PPM) |
| 7 | Yamhill | Soft (58 PPM) |
| 8 | Crooked River Ra | Soft (56 PPM) |
| 9 | Sheridan | Soft (55 PPM) |
| 10 | Klamath Falls | Soft (41 PPM) |
Top 10 Softest Water Cities
| # | City | Hardness |
|---|---|---|
| 1 | Aloha | Soft (12 PPM) |
| 2 | Beavercreek | Soft (12 PPM) |
| 3 | Beaverton | Soft (12 PPM) |
| 4 | Brightwood | Soft (12 PPM) |
| 5 | Buxton | Soft (12 PPM) |
| 6 | Colton | Soft (12 PPM) |
| 7 | Corbett | Soft (12 PPM) |
| 8 | Cornelius | Soft (12 PPM) |
| 9 | Eagle Creek | Soft (12 PPM) |
| 10 | Gales Creek | Soft (12 PPM) |
All Cities in Oregon
City pages marked Estimated use fallback values and should be confirmed with local testing or utility data.
AdamsModerately HardAdelSlightly HardAdrianSlightly HardAgnessVery HardAlbanySoftAlohaSoftAlseaSoftAmitySoftAntelopeSlightly HardApplegateSoftArch CapeSoftArlingtonVery HardAshlandSoftAshwoodSoftAstoriaSlightly HardAthenaModerately HardAuroraSoftAzaleaSoftBandonSlightly HardBanksSoftBatesModerately HardBay CitySoftBeattySoftBeaverSoftBeavercreekSoftBeavertonSoftBendSoftBlachlySoftBlack Butte RancSoftBlodgettSoftBlySoftBoardmanModerately HardBonanzaSoftBonnevilleSlightly HardBoringSoftBridgeportSoftBrightwoodSoftBroadbentSlightly HardBroganSlightly HardBrooksSoftBrothersSoftBrownsvilleSoftBurnsSoftButte FallsSoftBuxtonSoftCamas ValleySoftCamp ShermanSoftCanbySoftCannon BeachSoftCanyon CityHardCanyonvilleSoftCarltonSoftCascadiaSoftCave JunctionSoftCedar HillsSoftCentral PointSoftCharlestonSlightly HardCheshireSoftChiloquinSoftChristmas ValleySlightly HardClackamasSoftCloverdaleSoftCoburgSoftColtonSoftColumbia CitySoftCondonSlightly HardCoquilleSlightly HardCorbettSoftCorneliusSoftCorvallisSoftCottage GroveSoftCoveSoftCraneSlightly HardCrater LakeSoftCrescentSoftCreswellSoftCrooked River RaSoftCulverSoftDairySoftDaleModerately HardDallasSoftDays CreekSoftDaytonSlightly HardDayvilleSoftDeer IslandSoftDepoe BaySoftDetroitSoftDexterSoftDiamondSoftDiamond LakeSoftDonaldSoftDorenaSoftDrainSoftDrewseySlightly HardDundeeSlightly HardDurkeeSoftEagle CreekSoftEagle PointSoftEchoModerately HardEddyvilleSoftElginSoftElktonSoftElmiraSoftEnterpriseSlightly HardEstacadaSoftEugeneSoftFairviewSoftFall CreekSoftFalls CitySoftFieldsSoftFlorenceSoftFort KlamathSoftFort RockSoftFosterSoftFrenchglenSoftFriendSlightly HardGales CreekSoftGarden HomeSoftGardinerSoftGaribaldiSoftGastonSoftGatesSoftGearhartSoftGervaisSoftGilchristSoftGladstoneSoftGlendaleSoftGlenwoodSoftGlideSoftGold HillSoftGrand RondeSoftGrants PassSoftGrass ValleySlightly HardGreenleafSoftGreshamSoftHainesSoftHalfwaySoftHalseySoftHammondSoftHarborVery HardHarperSlightly HardHarrisburgSoftHeboSoftHelixModerately HardHeppnerSlightly HardHerefordSoftHermistonModerately HardHillsboroSoftHinesModerately HardHood RiverSlightly HardHubbardSoftHuntingtonSoftIdanhaSoftIdleyld ParkSoftImblerSoftImnahaSoftIndependenceSoftIoneModerately HardIronsideSlightly HardIrrigonSlightly HardJamiesonSlightly HardJeffersonSoftJohn DaySlightly HardJosephSoftJunction CitySoftJunturaSlightly HardKeizerSoftKenoSoftKentSoftKerbySoftKimberlyModerately HardKinzuaSlightly HardKlamath FallsSoftLa GrandeSoftLa PineSoftLafayetteSlightly HardLake OswegoSoftLakesideSlightly HardLakeviewSlightly HardLangloisHardLeaburgSoftLebanonSoftLexingtonModerately HardLincoln CitySoftLogsdenSoftLong CreekSlightly HardLoraneSoftLostineSlightly HardLowellSoftLyonsSoftMadrasSoftMalinSoftManningSoftManzanitaSoftMapletonSoftMarcolaSoftMaupinSlightly HardMc Kenzie BridgeSoftMcminnvilleSoftMcnarySlightly HardMeachamModerately HardMedfordSoftMedical SpringsSoftMerlinSoftMerrillSoftMidlandSoftMill CitySoftMilton FreewaterModerately HardMilwaukieSoftMitchellSlightly HardMolallaSoftMonmouthSoftMonroeSoftMonumentSoftMoroSlightly HardMosierSlightly HardMount AngelSoftMount Hood ParkdSlightly HardMount VernonSlightly HardMulinoSoftMyrtle CreekSoftMyrtle PointSlightly HardNehalemSoftNeotsuSoftNeskowinSoftNewbergSlightly HardNewportSoftNorth BendSlightly HardNorth PlainsSoftNorth PowderSoftNotiSoftO BrienSoftOak GroveSoftOaklandSoftOakridgeSoftOceansideSoftOntarioSlightly HardOregon CitySoftOretechSoftOtisSoftOxbowSoftPacific CitySoftPaisleySlightly HardPaulinaSoftPendletonModerately HardPhilomathSoftPhoenixSoftPilot RockModerately HardPistol RiverVery HardPleasant HillSoftPlushSoftPort OrfordModerately HardPortlandSoftPostSoftPowell ButteSoftPowersSlightly HardPrairie CitySoftPrincetonSoftPrinevilleSoftProspectSoftRainierSoftRedmondSoftRichlandSoftRickreallSoftRiddleSoftRileySoftRockawaySoftRockwood CornersSoftRogue RiverSoftRoseburgSoftRufusSlightly HardSaint HelensSoftSaint PaulSoftSalemSoftSandySoftScappooseSoftScioSoftScotts MillsSoftScottsburgSoftSeal RockSoftSelmaSoftSenecaSoftShady CoveSoftSheddSoftSheridanSoftSherwoodSoftSiletzSoftSilver LakeSoftSilvertonSoftSixesVery HardSouth BeachSoftSprague RiverSoftSpraySlightly HardSpringfieldSoftStanfieldModerately HardStaytonSoftSublimitySoftSummer LakeSoftSummervilleSoftSumpterSoftSunny ValleySoftSunriverSoftSutherlinSoftSweet HomeSoftSwisshomeSoftTalentSoftTangentSoftTenmileSoftThe DallesSlightly HardTidewaterSoftTigardSoftTillamookSoftTillerSoftTimberSoftTimberline LodgeSoftToledoSoftTolovana ParkSoftTrailSoftTroutdaleSoftTualatinSoftTurnerSoftUmpquaSoftUnionSoftUnitySoftValeSlightly HardVenetaSoftVernoniaSoftVidaSoftWaldportSoftWallowaSlightly HardWaltonSoftWamicSlightly HardWarm SpringsSoftWarrenSoftWarrentonSoftWascoSlightly HardWelchesSoftWest LinnSoftWest MainSoftWest StaytonSoftWestfallSlightly HardWestfirSoftWestlakeSoftWestonModerately HardWestportSoftWheelerSoftWhite CitySoftWildervilleSoftWillaminaSoftWilliamsSoftWilsonvilleSoftWinchester BaySoftWinstonSoftWoodburnSoftYachatsSoftYamhillSoftYoncallaSoftZigzagSoft