Washington tap water quality
2,374 active community water systems.
Largest water systems
| Grade | System | People | Health violations (5y) |
|---|
| A | Seattle Public Utilities | 1,161,961 | 0 |
| A | Tacoma Water | 446,245 | 0 |
| C | City of Vancouver Water | 373,047 | 0 |
| A | City of Spokane Water Department | 346,138 | 0 |
| A | City of Bellevue Utilities | 321,349 | 0 |
| A | Alderwood Water District | 245,715 | 0 |
| A | City of Everett Public Works Dept. | 215,774 | 0 |
| A | Kent Water Department | 166,421 | 0 |
| A | City of Redmond Water System | 163,335 | 0 |
| B | Clark Public Utilities | 153,526 | 0 |
| A | Lakehaven Water and Sewer District | 148,809 | 0 |
| A | City of Bellingham-Water Division | 141,127 | 0 |
| A | City of Olympia | 126,966 | 0 |
| C | City of Kennewick | 118,164 | 0 |
| B | Pasco Water Department | 115,102 | 0 |
| A | City of Yakima Water Division | 112,858 | 0 |
| A | Skagit County PUD 1 Judy Res | 111,415 | 0 |
| A | City of Renton | 108,091 | 0 |
| A | City of Auburn | 107,655 | 0 |
| C | City of Richland | 106,499 | 0 |
| A | Lacey Water Department | 105,178 | 0 |
| A | Highline Water District | 100,170 | 0 |
| A | Northshore Utility District | 99,789 | 0 |
| A | City of Puyallup | 94,520 | 0 |
| A | Marysville Utilities | 88,582 | 0 |
| B | Lakewood Water District | 82,425 | 0 |
| C | Sammamish Plateau Water & Sewer | 79,362 | 0 |
| A | Soos Creek Water & Sewer District | 74,172 | 0 |
| A | City of Bremerton | 72,951 | 0 |
| A | City of Kirkland | 69,243 | 0 |
| A | City of Lynnwood | 68,204 | 0 |
| A | Sno PUD 1 - Lake Stevens | 67,710 | 0 |
| A | Woodinville Water District | 66,699 | 0 |
| A | Silver Lake Water & Sewer District | 65,033 | 0 |
| C | Southwood | 64,155 | 0 |
| A | Longview Water Department | 57,617 | 0 |
| B | Covington Water District | 56,172 | 0 |
| A | City of Tumwater | 51,924 | 0 |
| A | King County Water District #20 | 48,469 | 0 |
| A | City of Wenatchee | 43,690 | 0 |
| A | Issaquah Water System | 43,584 | 0 |
| A | Bonney Lake Water Department City | 43,371 | 0 |
| B | Walla Walla Water Division | 42,959 | 0 |
| B | Nob Hill Water Association | 38,050 | 0 |
| A | Tukwila Water Department | 36,298 | 0 |
| C | Firgrove Mutual Inc | 36,168 | 0 |
| C | Jblm Lewis | 35,414 | 0 |
| A | Silverdale Water Dist 16 | 35,163 | 0 |
| B | Spanaway Water Company | 34,506 | 0 |
| A | City of Edmonds | 34,065 | 0 |
Most issues (systems serving 10,000+)
CNo health-based violations in the last 5 years; 42 monitoring/reporting violations; PFOA/PFOS average above the 4 ppt federal limit: PFOS; Other PFAS above 2024 limits (rule proposed for repeal): PFHxS, Hazard Index; Lead 90th percentile below the action level (2023).
CNo health-based violations in the last 5 years; 3 monitoring/reporting violations; PFOA/PFOS average above the 4 ppt federal limit: PFOS, PFOA; Lead 90th percentile below the action level (2024).
CNo health-based violations in the last 5 years; 2 monitoring/reporting violations; PFOA/PFOS average above the 4 ppt federal limit: PFOS, PFOA; Lead 90th percentile below the action level (2023).
CNo health-based violations in the last 5 years; PFOA/PFOS average above the 4 ppt federal limit: PFOA, PFOS; Lead 90th percentile below the action level (2023).
CNo 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 (2024).
CNo health-based violations in the last 5 years; PFOA/PFOS average above the 4 ppt federal limit: PFOA, PFOS; Lead 90th percentile below the action level (2024).
CNo 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 (2025).
CNo health-based violations in the last 5 years; 2 monitoring/reporting violations; PFOA/PFOS average above the 4 ppt federal limit: PFOS; Other PFAS above 2024 limits (rule proposed for repeal): PFHxS, Hazard Index; Lead 90th percentile below the action level (2025).
CNo health-based violations in the last 5 years; PFOA/PFOS average above the 4 ppt federal limit: PFOS; Other PFAS above 2024 limits (rule proposed for repeal): PFHxS, Hazard Index; Lead 90th percentile below the action level (2025).
CNo health-based violations in the last 5 years; 1 monitoring/reporting violation; 1 not yet resolved; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile ABOVE the action level (2025).
CNo health-based violations in the last 5 years; 3 monitoring/reporting violations; PFOA/PFOS average above the 4 ppt federal limit: PFOS; Lead 90th percentile below the action level (2024).
BNo health-based violations in the last 5 years; 1 monitoring/reporting violation; PFOA/PFOS average above the 4 ppt federal limit: PFOS; Lead 90th percentile below the action level (2025).
BNo health-based violations in the last 5 years; 1 monitoring/reporting violation; PFOA/PFOS average above the 4 ppt federal limit: PFOS; Lead 90th percentile below the action level (2023).
BNo health-based violations in the last 5 years; PFOA/PFOS average above the 4 ppt federal limit: PFOS; Lead 90th percentile below the action level (2023).
BNo health-based violations in the last 5 years; PFOA/PFOS average above the 4 ppt federal limit: PFOS; Lead 90th percentile below the action level (2025).
BNo health-based violations in the last 5 years; PFOA/PFOS average above the 4 ppt federal limit: PFOS; Lead 90th percentile below the action level (2025).
BNo health-based violations in the last 5 years; PFOA/PFOS average above the 4 ppt federal limit: PFOS; Lead 90th percentile below the action level (2023).
B1 health-based violation 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).
BNo health-based violations in the last 5 years; 22 monitoring/reporting violations; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2023).
BNo health-based violations in the last 5 years; 11 monitoring/reporting violations; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2025).
Cities
AberdeenAcmeAddyAirway HeightsAlbionAllynAlmiraAmanda ParkAmboyAnacortesAnderson IslandArdenvoirArielArlingtonAshfordAsotinAuburnBainbridge IslandBaringBattle GroundBay CenterBeaverBelfairBellevueBellinghamBenton CityBeverlyBickletonBingenBlack DiamondBlaineBlakely IslandBonney LakeBothellBowBremertonBrewsterBridgeportBrinnonBrush PrairieBuckleyBucodaBuenaBurbankBurlingtonCamano IslandCamasCamp MurrayCarltonCarnationCarsonCashmereCastle RockCathlametCentraliaChattaroyChehalisChelanChelan FallsCheneyChewelahChimacumChinookClallam BayClarkstonClaytonCle ElumClearlakeClintonColbertColfaxCollege PlaceColtonColvilleConconullyConcreteConnellConwayCopalis BeachCosmopolisCoulee CityCoulee DamCoupevilleCowicheCrestonCurlewCusickCusterDallesportDarringtonDavenportDaytonDeer HarborDeer ParkDemingDixieDrydenDupontDuvallEast WenatcheeEastsoundEatonvilleEdmondsEdwallElbeElectric CityElkEllensburgElmaElmer CityEltopiaEndicottEntiatEnumclawEphrataEthelEverettEversonFairchild Air Force BaseFairfieldFall CityFarmingtonFederal WayFerndaleFordForksFox IslandFreelandFriday HarborGalvinGarfieldGeorgeGiffordGig HarborGlenomaGold BarGoldendaleGrahamGrand CouleeGrandviewGrangerGranite FallsGrapeviewGraylandGrays RiverGreenacresGreenbankHamiltonHansvilleHarringtonHartlineHoodsportHoquiamHuntersIncheliumIndexIndianolaIoneIssaquahKahlotusKalamaKellerKelsoKenmoreKennewickKentKettle FallsKeyportKingstonKirklandKittitasLa CenterLA ConnerLa PushLaceyLaconnerLacrosseLake StevensLakebayLakewoodLamontLangleyLapushLatahLeavenworthLiberty LakeLilliwaupLincolnLindLong BeachLongbranchLongviewLoomisLoon LakeLopez IslandLummi IslandLyleLymanLyndenLynnwoodMabtonMalagaMaldenMallottMaloMaloneMalottManchesterMansfieldMansonMaple FallsMaple ValleyMarblemountMarcusMarlinMarshallMarysvilleMattawaMazamaMcchord AfbMcclearyMckennaMeadMedical LakeMedinaMercer IslandMesaMetalineMiltonMineralMoclipsMonitorMonroeMontesanoMortonMoses LakeMount VernonMountlake TerraceMoxeeMukilteoNachesNapavineNaselleNeah BayNespelemNewman LakeNewportNine Mile FallsNooksackNordlandNorth BendNorth BonnevilleNorthportOak HarborOakesdaleOakvilleOcean ParkOcean ShoresOdessaOkanoganOlallaOlgaOlympiaOmakOnalaskaOrcasOrientOrondoOrovilleOrtingOthelloOtis OrchardsOutlookOystervillePacificPacific BeachPackwoodPalouseParkerPascoPaterosPatersonPe EllPeshastinPlymouthPoint RobertsPomeroyPort AngelesPort GamblePort HadlockPort LudlowPort OrchardPort TownsendPoulsboPrescottPrestonProsserPullmanPuyallupQuilceneQuinaultQuincyRainierRandleRavensdaleRaymondReardanRedmondRentonRepublicRiceRichlandRidgefieldRitzvilleRiversideRochesterRock IslandRockfordRockportRooseveltRosaliaRosburgRoslynRoyRoyal CityRyderwoodSaint JohnSalkumSammamishSatsopSeabeckSeattleSeaviewSedro WooleySedro WoolleySekiuSelahSequimShaw IslandSheltonSilver CreekSilverdaleSilverlakeSkamokawaSkokomish NationSkykomishSnohomishSnoqualmieSnoqualmie PassSoap LakeSouth BendSouth Cle ElumSouth PrairieSpanawaySpangleSpokaneSpragueStanwoodStarbuckStehekinSteilacoomStevensonSultanSumasSumnerSunnysideSuquamishSversonTacomaTaholaTaholahTahuyaTekoaTeninoThorpTietonTokelandTonasketToppenishTracytonTrout LakeTulalipTumtumTwispUnderwoodUnionUniontownUniversity PlaceUskVaderValleyValleyfordVancouverVantageVashonVaughnVeradaleWahkiacusWaitsburgWalla WallaWallulaWapatoWardenWashougalWashtucnaWatervilleWaucondaWaverlyWellpinitWenatcheeWest RichlandWestportWhite SalmonWhite SwanWilburWilkesonWilson CreekWinlockWinthropWishramWoodinvilleWoodlandYacoltYakimaYelmZillah