Missouri tap water quality

1,434 active community water systems.

Largest water systems

GradeSystemPeopleHealth violations (5y)
AMissouri American Water (St. Louis County)1,111,0000
AKansas City Water553,2950
BCity of St. Louis Water Division304,7090
ACity Utilities of Springfield210,8980
ACity of Columbia Utilities126,2540
AIndependence PWS120,0000
ASt Charles County PWSD 2100,5870
BLees Summit PWS99,4000
AMO American St Joseph89,1710
ASt Charles PWS78,9610
AMO American Joplin73,7280
ABlue Springs PWS61,0840
BSt Peters PWS52,5750
AWentzville PWS41,7840
AUniversity of Missouri Columbia40,0000
CCape Girardeau PWS39,9411
AJefferson Co Cons PWSD C 137,0000
AFort Leonard Wood34,0000
AOfallon PWS32,5150
BLiberty PWS30,8000
AMO American Jefferson City District30,0750
AKirkwood PWS28,0000
AGladstone PWS27,0000
ABoone County Cons PWSD 124,7000
ANixa PWS24,5320
AJackson County PWSD 124,5000
ABelton PWS23,5980
AOzark PWS23,2480
ASedalia PWS21,7250
ARaymore PWS21,5170
AJefferson County PWSD 121,1130
ARolla PWS20,8000
AMO American Warrensburg18,5000
CFarmington PWS18,2172
CKirksville PWS17,5662
BHannibal PWS17,1081
ARaytown Water Company17,0660
BPoplar Bluff PWS17,0431
AJefferson County PWSD 317,0000
AMO American Platte County16,6450
ACole County PWSD 116,5480
AJefferson County PWSD 216,5480
AJackson County PWSD 216,4400
ASikeston PWS16,2910
ARepublic PWS16,1000
AGrain Valley PWS16,0000
ALebanon PWS15,4420
ABoone County PWSD 915,0350
ATroy PWS15,0000
AJackson PWS15,0000

Most issues (systems serving 10,000+)

D

Maryville PWS

Serves 10,775 people · Surface water · Full report →
4 health-based violations in the last 5 years; 9 monitoring/reporting violations; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2024).
C

Farmington PWS

Serves 18,217 people · Groundwater · Full report →
2 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 (2024).
C

Kirksville PWS

Serves 17,566 people · Surface water · Full report →
2 health-based violations in the last 5 years; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2025).
C

Cape Girardeau PWS

Serves 39,941 people · Groundwater · Full report →
1 health-based violation in the last 5 years; 5 monitoring/reporting violations; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2024).
B

Washington PWS

Serves 14,068 people · Groundwater · Full report →
1 health-based violation in the last 5 years; 4 monitoring/reporting violations; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2024).
B

St Peters PWS

Serves 52,575 people · Surface water · Full report →
No health-based violations in the last 5 years; PFOA/PFOS average above the 4 ppt federal limit: PFOA; Lead 90th percentile below the action level (2024).
B

Hannibal PWS

Serves 17,108 people · Surface water · Full report →
1 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 (2024).
B

West Plains PWS

Serves 12,864 people · Surface water · Full report →
1 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 (2025).
B

Liberty PWS

Serves 30,800 people · Groundwater · Full report →
No health-based violations in the last 5 years; 23 monitoring/reporting violations; 1 not yet resolved; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2024).
B

Poplar Bluff PWS

Serves 17,043 people · Surface water · Full report →
1 health-based violation in the last 5 years; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2025).
B

Kennett PWS

Serves 10,200 people · Groundwater · Full report →
No health-based violations in the last 5 years; 45 monitoring/reporting violations; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2024).
B

City of St. Louis Water Division

Serves 304,709 people · Surface water · Full report →
No health-based violations in the last 5 years; 8 monitoring/reporting violations; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2025).
B

Lees Summit PWS

Serves 99,400 people · Surface water · Full report →
No health-based violations in the last 5 years; 5 monitoring/reporting violations; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2023).
A

Belton PWS

Serves 23,598 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 (2024).
A

Jefferson County PWSD 2

Serves 16,548 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 (2024).
A

Neosho PWS

Serves 12,157 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

Kansas City Water

Serves 553,295 people · Surface water · Full report →
No health-based violations in the last 5 years; 3 monitoring/reporting violations; 1 not yet resolved; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2025).
A

Ozark PWS

Serves 23,248 people · Groundwater · 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

Sedalia PWS

Serves 21,725 people · Groundwater · Full report →
No health-based violations in the last 5 years; 3 monitoring/reporting violations; 1 not yet resolved; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2024).
A

Thomas Hill PWSD 1

Serves 11,250 people · Surface water · Full report →
No health-based violations in the last 5 years; 3 monitoring/reporting violations; 1 not yet resolved; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2024).

Cities

AdrianAdvanceAgencyAlbaAlbanyAlexandriaAllendaleAllenvilleAlmaAltamontAltenburgAltonAmazoniaAmityAmoretAmsterdamAnabelAndersonAndrewAnnadaAnnapolisAnnistonAppleton CityArbelaArbyrdArcadiaArchieArcolaArgyleArmstrongArnoldArrow RockAsburyAsh GroveAshlandAtlantaAugustaAuroraAuxvasseAvaBakersfieldBallwinBaringBarnardBarnettBarnhartBates CityBattlefieldBeaufortBelgradeBell CityBelleBelleviewBellflowerBeltonBentonBergerBernieBertrandBethanyBethelBevierBig LakeBillingsBirch TreeBirminghamBismarckBlackburnBlackwaterBlairstownBlandBlodgettBloomfieldBloomsdaleBlue EyeBlue SpringsBlythdaleBlythedaleBogardBois D ArcBolckowBolivarBonne TerreBonnots MillBoonvilleBosworthBourbonBowling GreenBragg CityBraggadocioBrandsvilleBransonBranson WestBrashearBraymerBreckenridgeBridgetonBrightonBronaughBrookfieldBrooklineBroseleyBrosleyBrowningBrunswickBuckhornBucklinBucknerBucyrusBuffaloBuncetonBunkerBurfordvilleBurlington JunctionButlerButterfieldCaboolCainsvilleCairoCaledoniaCalhounCaliforniaCallaoCamdenCamden PointCamdentonCameronCampbellCanalouCantonCape FairCape GirardeauCaplinger MillsCardwellCarl JunctionCarrolltonCartervilleCarthageCaruthersvilleCassvilleCatawissaCedar HillCenterCentertownCenterviewCentervilleCentraliaChadwickChaffeeChamoisCharlestonChesterfieldChestnutridgeChilhoweeChillicotheChulaClarenceClarkClarksburgClarksdaleClarksvilleClarktonClearmontClevelandCleverClifton HillClimax SpringsClintonClydeCoatsvilleCoffeyCole CampCollinsColumbiaCommerceConceptionConception JunctionConcordiaConey IslandConwayCooterCorderCosbyCowgillCraigCraneCreightonCrockerCross TimbersCrystal CityCubaCurryvilleDadevilleDaltonDarlingtonDawnDe KalbDe SotoDe WittDearbornDeepwaterDeerfieldDeeringDefianceDekalbDeltaDenverDesotoDevils ElbowDexterDiamondDixonDoe RunDoniphanDoverDowningDrexelDudleyDuenwegDurhamDutchtownEagle RockEaglevilleEarth CityEast LynneEast PrairieEastonEdgar SpringsEdgertonEdinaEdwardsEl Dorado Spgs.El Dorado SpringsEldonEldorado SpringEldridgeElklandEllingtonEllsinoreElmerElmoElsberryElwood, KsEmdenEminenceEmmaEoliaEssexEthelEugeneEurekaEvertonEwingExcelloExcelsior Spgs.Excelsior SpringsExeterFair GroveFair PlayFairdealingFairfaxFairviewFarberFarleyFarmingtonFarrarFayetteFentonFerrelviewFestusFillmoreFiskFlemingtonFletcherFlint HillFlorenceFlorissantFoleyFordlandForest CityForistellForsythFort Leonard WoodFortunaFosterFrankensteinFrankfordFranklinFredericktownFreeburgFreemanFreemontFreistattFremontFrench VillageFriedheimFrohnaFultonGainesvilleGainsvilleGalenaGallatinGaltGarden CityGasconadeGentryGeraldGibbsGibsonGideonGilliamGilman CityGladstoneGlasgowGlencoeGlenwoodGoblerGoldenGolden CityGoodmanGordonvilleGorinGowerGrahamGrain ValleyGranbyGrandinGrandviewGrangerGrant CityGravois MillsGray SummitGreen CastleGreen CityGreen RidgeGreenfieldGreentopGreenvilleGreenwoodGroverGrovespringGrubvilleGuilfordHaleHalf WayHalfwayHallsvilleHalltownHamiltonHannibalHardinHarrisHarrisburgHarrisonvilleHartsburgHartvilleHarviellHarwoodHatfieldHawk PointHaytiHazelwoodHelenaHematiteHenleyHenriettaHerculaneumHermannHermitageHigbeeHigginsvilleHigh HillHigh RidgeHighlandvilleHillsboroHolcombHoldenHollandHollidayHollisterHoltHolts SummitHopkinsHornersvilleHouse SpringsHoustonHoustoniaHughesvilleHumansvilleHumeHumphreysHunnewellHuntsvilleHurdlandHurleyIberiaImperialIndependenceIonaIoniaIrondaleIrontonIsabellaJacksonJacksonvilleJamesonJamesportJamestownJasperJefferson CityJerico SpringsJeromeJonesburgJoplinKahokaKaiserKansas CityKearneyKelsoKennettKewaneeKeytesvilleKidderKimberling CityKimmswickKing CityKingdom CityKingstonKingsvilleKirbyvilleKirksvilleKirkwoodKissee MillsKnob NosterKnox CityKoeltztownKoshkonongLA BelleLA GrangeLa MonteLa PlataLabadieLacledeLaddoniaLake LotawanaLake OzarkLake Saint LouisLake WinnebagoLamarLamonteLampeLanaganLancasterLaplataLaqueyLaredoLathamLathropLaurieLawsonLeadwoodLeasburgLebanonLees SummitLeetonLenoxLentnerLeonardLeopoldLeslieLestervilleLevasyLewistownLexingtonLiberalLibertyLickingLiguoriLilbournLincolnLinnLinn CreekLinneusLivoniaLock SpringsLockwoodLohmanLone JackLoose CreekLouisburgLouisianaLowry CityLucerneLudlowLuebberingLurayMacks CreekMaconMadisonMaitlandMaldenMalta BendMansfieldMarble HillMarcelineMarionvilleMarquandMarshallMarshfieldMarstonMarthasvilleMartinsburgMartinsvilleMaryland HeightsMaryvilleMatthewsMaysvilleMayviewMaywoodMc FallMeadvilleMemphisMendonMercerMetaMetzMexicoMiamiMid MissouriMiddle BrookMiddletownMilanMill SpringMillerMillersvilleMiloMindenminesMineral PointMissouri CityMoberlyMokaneMonettMonroe CityMontgomery CityMonticelloMontrealMontroseMooresvilleMorehouseMorleyMorrisonMorrisvilleMosbyMoscow MillsMound CityMoundvilleMount VernonMountain GroveMountain ViewMurphyMyrtleN. Kansas CityNapoleonNaylorNeelyvilleNelsonNeoshoNevadaNew BloomfieldNew BostonNew CambriaNew FlorenceNew FranklinNew HamptonNew HavenNew LondonNew MadridNewarkNewburgNewtonNewtoniaNewtownNianguaNixaNoelNorborneNorthmoorNorwoodNoveltyNovingerO FallonOak GroveOak RidgeOdessaOld AppletonOld MonroeOleanOranOregonOronogoOrrickOsage BeachOsbornOsceolaOttervilleOwensvilleOxlyOzarkPacificPalmyraParisPark HillsParkdaleParkvilleParmaParnellPattersonPattonPattonsburgPeculiarPerkinsPerryPerryvillePevelyPhiladelphiaPhillipsburgPickeringPiedmontPierce CityPilot GrovePilot KnobPinevillePittsburgPlatte CityPlattsburgPleasant HillPleasant HopePlevnaPoint LookoutPollockPoloPomonaPonce De LeonPoplar BluffPortage Des SiouxPortagedessiouxPortagevillePortlandPotosiPowellPowersitePowersvillePrairie HomePrathersvillePrestonPrincetonPurcellPurdinPurdyPuxicoQueen CityQuincyQulinRacineRavenwoodRaymondvilleRaymoorRaymoreRaytownRayvilleReaReeds SpringRenickRepublicRevereRhinelandRich HillRichardsRichlandRichmondRichwoodsRidgedaleRidgewayRiscoRiversideRivesRoachRobertsvilleRocheportRock PortRockaway BeachRockvilleRocky ComfortRocky MountRocky RidgeRogersvilleRollaRombauerRosebudRosendaleRothvilleRush HillRushvilleRussellvilleRutledgeS. GreenfieldSaint AlbansSaint AnnSaint CharlesSaint ClairSaint ElizabethSaint JamesSaint JosephSaint LouisSaint MarySaint PatrickSaint PetersSaint RobertSaint ThomasSainte GenevieveSalemSalineSalisburySanta FeSarcoxieSavannahSavertonSchell CityScott CitySedaliaSedgewickvilleSeligmanSenathSenecaSeymourShelbinaShelbyvilleSheldonShell KnobSheridanSibleySikestonSilexSilvaSkidmoreSlaterSmithtonSmithvilleSouth GreenfieldSouth West CitySouthwest CitySpartaSpickardSpokaneSpringfieldSt. CharlesSt. ClairSt. ElizabethSt. JamesSt. JosephSt. LouisSt. MartinsSt. MarySt. PetersSt. RobertSt. ThomasStaffordStanberryStantonStark CitySte. GenevieveSteedmanSteeleSteelvilleStellaStewartsvilleStocktonStotts CityStoutlandStoutsvilleStoverStraffordStrasburgSturgeonSuccessSugar CreekSullivanSummersvilleSumnerSunrise BeachSweet SpringsSyracuseTaneyvilleTarkioTaylorTebbettsTecumsehThayerTheodosiaThompsonTightwadTinaTiptonTracyTrentonTrimbleTriplettTroyTruesdaleTruxtonTurnersTurneyTuscumbiaUnionUnion StarUniontownUnionvilleUnity VillageUrbanaUrichUticaValles MinesValley ParkVan BurenVandaliaVanduserVeronaVersaillesViburnumVichyViennaVilla RidgeVulcanWaldronWalkerWalnut GroveWalnut ShadeWappapelloWardellWardsvilleWarrensburgWarrentonWarsawWashburnWashingtonWathena, KsWatsonWaverlyWaylandWaynesvilleWeatherbyWeaubleauWebb CityWeldon Spr HghtWellingtonWellsvilleWentzvilleWest PlainsWestboroWestonWestphaliaWheatlandWheatonWheelingWhiteman Air Force BaseWhiteoakWhitewaterWillardWilliamsburgWilliamstownWilliamsvilleWillow SpringsWindsorWinfieldWiniganWinonaWinstonWood HeightsWooldridgeWoolridgeWorthWorthingtonWright CityWyacondaWyatt