Illinois tap water quality

1,788 active community water systems.

Largest water systems

GradeSystemPeopleHealth violations (5y)
BChicago Department of Water Management2,721,3080
CAurora183,0000
CJoliet160,0001
BNaperville156,4060
AIl American-Champaign150,0000
BRockford147,0510
BIl American-Peoria137,5750
AIl American-East St Louis131,3680
ASpringfield117,4440
CElgin114,7970
BWaukegan87,1490
CCicero83,0001
BAqua Illinois-Kankakee80,0001
ABloomington79,0000
ADecatur76,1220
ASchaumburg75,7500
AEvanston74,4860
AIl American-West Suburban73,9780
BArlington Heights73,3200
APalatine70,8750
BSkokie66,4220
ADes Plaines60,6750
AOak Lawn58,3620
AOrland Park58,0200
BBerwyn57,2500
ATinley Park56,7030
AOak Park54,5830
AWheaton53,9700
ANormal52,7360
ARomeoville50,4580
AHoffman Estates50,1790
APlainfield50,0000
ADowners Grove49,4250
BGlenview47,8560
AO Fallon46,6030
AIl American-Alton46,1270
AElmhurst45,0000
AMoline44,5000
ALombard44,4760
ABuffalo Grove43,2120
AQuincy42,0000
CBartlett41,5000
BMount Prospect41,0000
BCrystal Lake40,6610
ADekalb40,2900
ACarol Stream39,8540
APark Ridge39,8000
AWheeling39,7250
ARock Island39,0180
AStreamwood38,3600

Most issues (systems serving 10,000+)

D

Macomb

Serves 15,051 people · Surface water · Full report →
4 health-based violations in the last 5 years; 6 monitoring/reporting violations; 1 not yet resolved; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2025).
D

Crest Hill

Serves 20,223 people · Groundwater · Full report →
1 health-based violation in the last 5 years; 30 monitoring/reporting violations; 3 not yet resolved; PFOA/PFOS average above the 4 ppt federal limit: PFOA; Other PFAS above 2024 limits (rule proposed for repeal): PFHxS, Hazard Index; Lead 90th percentile below the action level (2025).
D

Lemont

Serves 18,513 people · Groundwater · Full report →
2 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 (2026).
D

South Elgin

Serves 23,648 people · Groundwater · Full report →
2 health-based violations in the last 5 years; 5 monitoring/reporting violations; 2 not yet resolved; PFOA/PFOS average above the 4 ppt federal limit: PFOA; Lead 90th percentile below the action level (2026).
D

North Park PWD

Serves 35,580 people · Groundwater · Full report →
No health-based violations in the last 5 years; PFOA/PFOS average above the 4 ppt federal limit: PFOA, PFOS; Other PFAS above 2024 limits (rule proposed for repeal): PFHxS, Hazard Index; Lead 90th percentile below the action level (2025).
C

Carbondale

Serves 22,107 people · Surface water · Full report →
3 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 (2025).
C

Richton Park

Serves 12,504 people · Groundwater · Full report →
2 health-based violations in the last 5 years; 32 monitoring/reporting violations; 3 not yet resolved; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2026).
C

Elgin

Serves 114,797 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 ABOVE the action level (2026).
C

North Chicago

Serves 16,813 people · Surface water · Full report →
2 health-based violations in the last 5 years; 6 monitoring/reporting violations; 1 not yet resolved; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2026).
C

Collinsville

Serves 30,616 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 (2025).
C

Morton Grove

Serves 25,297 people · Surface water · Full report →
No health-based violations in the last 5 years; 4 monitoring/reporting violations; 2 not yet resolved; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile ABOVE the action level (2026).
C

South Holland

Serves 22,000 people · Surface water · Full report →
2 health-based violations in the last 5 years; 4 monitoring/reporting violations; 2 not yet resolved; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2025).
C

Il American-Lincoln

Serves 15,200 people · Surface water · Full report →
1 health-based violation in the last 5 years; PFOA/PFOS average above the 4 ppt federal limit: PFOA; Lead 90th percentile below the action level (2025).
C

East Moline

Serves 21,374 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 ABOVE the action level (2026).
C

Bartlett

Serves 41,500 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 ABOVE the action level (2026).
C

Lake Forest

Serves 19,642 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 ABOVE the action level (2026).
C

Aurora

Serves 183,000 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 ABOVE the action level (2026).
C

Lake of Egypt PWD

Serves 11,368 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

Ottawa

Serves 18,097 people · Groundwater · Full report →
1 health-based violation in the last 5 years; 9 monitoring/reporting violations; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2025).
C

Maywood

Serves 24,090 people · Surface water · Full report →
1 health-based violation in the last 5 years; 8 monitoring/reporting violations; 3 not yet resolved; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2025).

Cities

AbingdonAdairAddievilleAddisonAlbanyAlbersAlbionAledoAlexanderAlexisAlgonquinAlhambraAllendaleAllertonAlmaAlphaAlseyAlsipAltamontAlto PassAltonAltonaAlvanAlvinAmboyAnchorAnconaAndalusiaAndoverAnnaAnnapolisAnnawanAntiochApple RiverArcolaArenzvilleArgentaArlingtonArlington HeightsArmingtonAroma ParkArrowsmithArthurAshkumAshlandAshleyAshmoreAshtonAssumptionAstoriaAthensAtkinsonAtlantaAtwoodAuburnAugustaAuroraAvaAvistonAvonBaileyvilleBaldwinBannockburnBardolphBarringtonBarryBarstowBartelsoBartlettBascoBataviaBatchtownBathBaylisBeach ParkBeardstownBeavervilleBeckemeyerBedford ParkBeecherBeecher CityBelknapBelle RiveBellevilleBellevueBellflowerBellmontBellwoodBelvidereBementBenldBensenvilleBensonBentonBerkeleyBerwynBethaltoBethanyBiggsvilleBinghamBishop HillBlackstoneBlandinsvilleBloomingdaleBloomingtonBlue IslandBlue MoundBluffsBlufordBolesBolingbrookBondvilleBone GapBonfieldBonnieBourbonnaisBowenBracevilleBradfordBradleyBraidwoodBreeseBridgeportBridgeviewBrightonBrimfieldBristolBroadlandsBroadviewBroadwellBroctonBrookfieldBrookportBroughtonBrowningBrownstownBrusselsBryantBuckinghamBuckleyBucknerBudaBuffalo GroveBulpittBuncombeBunker HillBurbankBurbank (South Stickney)BureauBureau JunctionBurlingtonBurnhamBurnt PrairieBurr RidgeBushBushnellButlerByronCaberyCahokiaCairoCaledoniaCalhounCalumet CityCalumet ParkCamargoCambriaCambridgeCamdenCamp GroveCamp PointCampbell HillCampusCantonCantrallCapronCarbon CliffCarbon HillCarbondaleCarlinvilleCarlockCarlyleCarmiCarol StreamCarpentersvilleCarrier MillsCarrolltonCartervilleCarthageCaryCaseyCaseyvilleCatlinCave in RockCedar PointCedarvilleCentraliaCerro GordoChadwickChambersburgChampaignChanaChandlervilleChannahonChapinCharlestonChathamChatsworthChebanseChenoaCherryCherry ValleyChesterChesterfieldChestnutChicagoChicago HeightsChicago RidgeChillicotheChrismanChristopherCiceroCiscoCisneCissna ParkClaremontClarendon HillsClay CityClaytonCliftonClintonCoal CityCoal ValleyCoaltonCoatsburgCobdenCoelloCoffeenColchesterColetaColfaxCollinsvilleColonaColpColumbiaColusaComptonConcordCongervilleCooksvilleCordovaCornellCortlandCottage HillsCoultervilleCountry Club HillsCountrysideCowdenCrainvilleCreal SpringsCrescent CityCrest HillCrestonCrestwoodCreteCreve CoeurCropseyCrossvilleCrystal LakeCubaCullomCutlerCypressDahindaDahlgrenDakotaDaleDallas CityDalton CityDalzellDamiansvilleDanaDanforthDanversDanvilleDarienDavisDavis JunctionDawsonDe KalbDe LandDe PueDe SotoDe WittDecaturDeer CreekDeerfieldDekalbDelavanDennisonDepueDes PlainesDeweyDewittDiamondDieterichDivernonDixDixmoorDixonDoltonDongolaDonnellsonDonovanDorchesterDorseyDoverDowDowellDowners GroveDownsDu BoisDu QuoinDuboisDundasDundeeDunfermlineDunlapDupoDurandDwightEagarvilleEagervilleEarlvilleEast AltonEast CarondeletEast Chicago HeightsEast DubuqueEast DundeeEast GalesburgEast Hazel CrestEast LynnEast MolineEast PeoriaEast Saint LouisEast St LouisEastonEddyvilleEdelsteinEdgewoodEdinburgEdwardsEdwardsvilleEffinghamEl PasoElburnEldoradoEldredElginElizabethElizabethtownElk GroveElk Grove VillageElkhartElkvilleElliottEllis GroveEllsworthElmhurstElmwoodElmwood ParkElsahElvastonElwoodEmdenEmingtonEnergyEnfieldEolaEqualityErieEssexEurekaEvanstonEvansvilleEvergreen ParkFairburyFairfieldFairmountFairviewFairview HeightsFarinaFarmer CityFarmersvilleFarmingtonFayettevilleFerrisFiattFieldonFillmoreFindlayFisherFithianFlanaganFlat RockFloraFlossmoorForest CityForest ParkForest ViewForrestForrestonForsythFowlerFox LakeFox River GroveFrankfortFranklinFranklin GroveFranklin ParkFreeburgFreemanspurFreeportFultonFultsGalatiaGalenaGalesburgGaltGalvaGardnerGarrettGaysGeffGeneseoGenevaGenoaGeorgetownGerman ValleyGermantownGibson CityGiffordGilbertsGillespieGilmanGirardGladstoneGlasfordGlen CarbonGlen EllynGlenarmGlencoeGlendale HeightsGlenviewGlenwoodGodfreyGolcondaGoldenGolden EagleGolfGood HopeGoodfieldGorevilleGorhamGraftonGrand ChainGrand RidgeGrand TowerGrandviewGranite CityGrant ParkGrantforkGrantsburgGranvilleGrays LakeGrayslakeGrayvilleGreat LakesGreen OaksGreen RockGreen ValleyGreenfieldGreenupGreenviewGreenvilleGridleyGriggsvilleGrovelandGurneeHainesvilleHamburgHamelHamiltonHammondHampshireHamptonHanafordHanna CityHanoverHanover ParkHardinHarmonHarrisburgHarristownHartfordHartsburgHarvardHarvelHarveyHarwood HeightsHavanaHawthorn WoodsHazel CrestHebronHeckerHendersonHennepinHenryHerrickHerrinHerscherHettickHeyworthHickory HillsHidalgoHighlandHighland ParkHighwoodHillcrestHillsboroHillsdaleHillsideHillviewHinckleyHindsboroHinesHinsdaleHodgkinsHoffmanHoffman EstatesHoliday HillsHollowayvilleHomerHomer GlenHometownHomewoodHoopestonHopedaleHoyletonHudsonHullHumboldtHumeHuntleyHuntsvilleHurstHutsonvilleIllinois CityIlliopolisInaIndian Head ParkIndianolaIndustryInglesideIngrahamIolaIpavaIrvingIrvingtonIsland LakeItascaIukaIvesdaleJacksonvilleJeffersonvilleJeiseyvilleJeromeJerseyvilleJewettJohnston CityJolietJonesboroJoppaJoyJunctionJunction CityJusticeKampsvilleKaneKankakeeKansasKarnakKeensburgKeithsburgKellKemptonKenilworthKenneyKewaneeKeyesportKincaidKinderhookKingstonKingston MinesKinmundyKinsmanKirklandKirkwoodKnoxvilleLA FayetteLA GrangeLA Grange ParkLA HarpeLA MoilleLa PlaceLA PrairieLA RoseLA SalleLaconLaddLake BarringtonLake BluffLake ForestLake in the HillsLake VillaLake ZurichLakemoorLakewoodLanarkLansingLathamLawrencevilleLe RoyLeaf RiverLebanonLeeLelandLemontLenaLenzburgLeonoreLernaLewistownLexingtonLibertyLibertyvilleLimaLincolnLincolnshireLincolnwoodLindenhurstLindenwoodLisleLitchfieldLittle YorkLittletonLivingstonLoamiLockportLodaLoganLomaxLombardLondon MillsLong CreekLong GroveLong PointLong ViewLongviewLoraineLostantLouisvilleLovejoyLoves ParkLovingtonLowpointLudlowLyndonLynn CenterLynnvilleLynwoodLyonsMacedoniaMachesney ParkMackinawMacombMaconMadisonMaeystownMagnoliaMahometMakandaMaldenMaltaManchesterManhattanManitoManliusMansfieldMantenoMaple ParkMapletonMaquonMarengoMariettaMarineMarionMarissaMarkMarkhamMaroaMarquette HeightsMarseillesMarshallMartinsvilleMartintonMaryvilleMascoutahMasonMason CityMathersvilleMathervilleMattesonMattoonMaywoodMazonMc ClureMc LeanMc LeansboroMc NabbMcCookMcHenryMcLeanMcLeansboroMcNabbMechanicsburgMediaMedinahMedoraMelrose ParkMelvinMendonMendotaMeredosiaMerrionette ParkMetamoraMetcalfMetropolisMichaelMiddletownMidlothianMilanMilfordMill ShoalsMilledgevilleMillingtonMillstadtMiltonMineralMinierMinonkMinookaModeModestoMokenaMolineMomenceMoneeMonmouthMonroe CenterMontgomeryMonticelloMontroseMooseheartMoroMorrisMorrisonMorrisonvilleMortonMorton GroveMossvilleMound CityMound StationMoundsMount AuburnMount CarmelMount CarrollMount ClareMount ErieMount MorrisMount OliveMount ProspectMount PulaskiMount SterlingMount VernonMount ZionMoweaquaMozierMt ZionMuddyMulberry GroveMulkeytownMundeleinMurphysboroNachusaNapervilleNaplateNashvilleNational Stock YardsNauvooNeboNeogaNeponsetNew AthensNew BadenNew BerlinNew BostonNew BurnsideNew CantonNew DouglasNew HavenNew HollandNew LenoxNew MemphisNew MillfordNew MindenNew SalemNew WindsorNewarkNewmanNewtonNianticNilesNilwoodNiotaNobleNokomisNormalNorridgeNorrisNorris CityNorth AuroraNorth ChicagoNorth CityNorth HendersonNorth LakeNorth PekinNorth RiversideNorth UticaNorthbrookNorthfieldO FallonOak BrookOak Brook TerrOak ForestOak LawnOak ParkOakdaleOakfordOaklandOakwoodOblongOconeeOdellOdinOgdenOglesbyOhioOhlmanOkawvilleOld ShawneetownOlive BranchOlmstedOlneyOlympia FieldsOmahaOnargaOneidaOpdykeOphiemOquawkaOrangevilleOreanaOregonOrientOrionOrland ParkOscoOswegoOttawaOwanecoOzarkPalatinePalestinePalmerPalmyraPalos HeightsPalos HillsPalos ParkPanaPanamaParisPark CityPark ForestPark RidgeParkersburgPatokaPattersonPaw PawPawneePaxtonPaysonPearlPearl CityPecatonicaPekinPembrokePembroke TownshipPenfieldPeoriaPeoria HeightsPeotonePercyPerryPeruPesotumPetersburgPhiloPhoenixPierronPinckneyvillePiper CityPittsburgPittsfieldPk Forest SouthPlainfieldPlainvillePlanoPleasant HillPleasant PlainsPlymouthPocahontasPoloPomonaPontiacPontoon BeachPoplar GrovePort ByronPosenPotomacPrairie CityPrairie Du RocherPrairie Du RochrPreemptionPrincetonPrincevilleProphetstownProspect HeightsPulaskiPutnamQuincyRadomRaleighRamseyRankinRansomRantoulRapids CityRaritanRaymondRed BudReddickReynoldsRichmondRichton ParkRichviewRidge FarmRidgwayRingwoodRioRipleyRiver ForestRiver GroveRiverdaleRiversideRivertonRiverwoodsRoanokeRobbinsRobertsRobinsonRochelleRochesterRock CityRock FallsRock IslandRockbridgeRockdaleRockfordRockportRocktonRolling MeadowsRomeRomeovilleRoodhouseRosamondRoscoeRoselleRosemontRosevilleRosiclareRossvilleRound LakeRound Lake BeachRound Lake HeightsRound Lake ParkRoxanaRoyalRoyal LakesRoyaltonRumaRushvilleRutlandSadorusSailor SpringsSaint AnneSaint AugustineSaint CharlesSaint DavidSaint ElmoSaint FrancisvilleSaint JacobSaint JosephSaint LiborySaint PeterSainte MarieSalemSan JoseSandovalSandwichSaukSauneminSavannaSavoySawyervilleSaybrookScales MoundSchaumburgSchellerSchiller ParkSchram CitySciotaScott Air Force BaseSeatonSeatonvilleSecorSenecaSesserSeymourShabbonaShannonShawneetownSheffieldShelbyvilleSheldonSheridanShermanSherrardShilohShipmanShobonierShorewoodShumwaySibleySidellSidneySigelSilvisSimpsonSimsSkokieSleepy HollowSmithboroSmithfieldSmithshireSmithtonSomonaukSorentoSouth BeloitSouth Chicago HeightsSouth ElginSouth HollandSouth JacksonvilleSouth PekinSouth RoxanaSouth WilmingtonSparlandSpartaSpring GroveSpring ValleySpringertonSpringfieldSt AugustineSt LiboryStandardStanfordStauntonSteelevilleStegerSterlingStewardStewardsonStickneyStillman ValleyStocktonStone ParkStonefortStoningtonStrasburgStrawnStreamwoodStreatorStronghurstSubletteSugar GroveSullivanSummerfieldSummitSummit ArgoSumnerSun River TerraceSutterSycamoreTable GroveTallulaTamaroaTammsTampicoTaylor RidgeTaylor SpringsTaylorvilleTennesseeTeutopolisTexicoThawvilleThayerThebesThomasboroThompsonvilleThomsonThorntonTildenTiltonTimewellTinley ParkTiskilwaToledoTolonoTolucaTonicaToulonToveyTowandaTower HillTower LakesTremontTrentonTrillaTrivoliTroyTroy GroveTuscolaUllinUnionUniversity ParkUrbanaUrsaValierValmeyerVan OrinVandaliaVarnaVeniceVergennesVermilionVermontVernonVernon HillsVersaillesVictoriaViennaVilla GroveVilla ParkViolaVirdenVirginiaVoloWadsworthWaggonerWalnutWalnut HillWalshWaltonvilleWamacWapellaWarrenWarrensburgWarrenvilleWarsawWascoWashburnWashingtonWatagaWaterlooWatermanWatsekaWatsonWaucondaWaukeganWaverlyWayne CityWaynesvilleWedronWeldonWellingtonWenonaWest BrooklynWest ChicagoWest CityWest DundeeWest FrankfortWest LibertyWest PointWest SalemWest UnionWestchesterWestern SpringsWestfieldWesthavenWestmontWestonWestvilleWheatonWheelerWheelingWhite CityWhite HallWhite HeathWhittingtonWilliamsfieldWilliamsvilleWillisvilleWillow HillWillow SpringsWillowbrookWilmetteWilmingtonWilsonvilleWinchesterWindsorWinfieldWinnebagoWinnetkaWinslowWinthrop HarborWittWolf LakeWonder LakeWood DaleWood RiverWoodhullWoodlandWoodlawnWoodridgeWoodsonWoodstockWoosungWordenWorthWrightsWyanetWyomingXeniaYaleYates CityYorkvilleZeiglerZion