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WaterSafeCheck
Official EPA SDWIS Statewide AnalysisState Water Quality & Testing Directory

Wisconsin Drinking Water Quality & Testing Directory

Comprehensive EPA compliance records, water testing guidelines, and city rankings covering all 898 ZIP codes across Wisconsin

Quick Summary: Is Tap Water Safe in Wisconsin?

Drinking water in Wisconsin receives an average composite safety score of 65.6/100 based on EPA Safe Drinking Water Act records. Approximately 0% of monitored ZIP codes earn an "A" grade. Water sources are 14.5% surface water and 85.5% groundwater, resulting in Hard to Very Hard mineral hardness across the state.

Total ZIP Codes

898

Health Violations (5yr)

816

Statewide Avg Score

65.6/100

High Lead Risk Areas

65.7%

Overview: Drinking Water in Wisconsin

Drinking water quality in Wisconsin averages a composite safety score of 65.6/100 across its 898 monitored ZIP codes. Approximately 0% of ZIP codes in the state receive an "A" grade, while 1% receive an "F" grade. Environmental standards are enforced by Wisconsin Department of Natural Resources.

Surface Water

14.5%

of ZIP codes

Total Violations

5,281

5-year record

Grade A ZIPs

0

0% of state

Grade F ZIPs

8

1% of state

Water Quality Grade Distribution in Wisconsin

How do Wisconsin's 898 ZIP codes stack up by water quality grade?

A
0 ZIP codes0%
B
359 ZIP codes40%
C
309 ZIP codes34%
D
222 ZIP codes25%
F
8 ZIP codes1%

Popular Cities in Wisconsin

Click any city to view ZIP code-level water quality reports

Milwaukee

42 ZIPs

B

Madison

35 ZIPs

C

Green Bay

12 ZIPs

B

Racine

8 ZIPs

B

Appleton

6 ZIPs

C

Kenosha

5 ZIPs

C

Oshkosh

5 ZIPs

C

Waukesha

4 ZIPs

D

Janesville

4 ZIPs

D

Brookfield

3 ZIPs

C

Sheboygan

3 ZIPs

B

Wausau

3 ZIPs

C

Marshfield

3 ZIPs

F

Stevens Point

3 ZIPs

D

La Crosse

3 ZIPs

B

Eau Claire

3 ZIPs

B

Fond Du Lac

3 ZIPs

D

Menomonee Falls

2 ZIPs

C

New Holstein

2 ZIPs

B

West Bend

2 ZIPs

D

Watertown

2 ZIPs

F

New Berlin

2 ZIPs

C

Silver Lake

2 ZIPs

B

Beloit

2 ZIPs

C

Dodgeville

2 ZIPs

C

Sun Prairie

2 ZIPs

C

Randolph

2 ZIPs

D

Reedsburg

2 ZIPs

B

Manitowoc

2 ZIPs

B

Wisconsin Rapids

2 ZIPs

C

Chippewa Falls

2 ZIPs

B

Iola

2 ZIPs

D

Neenah

2 ZIPs

B

Adell

1 ZIP

B

Allenton

1 ZIP

B

Ashippun

1 ZIP

D

Belgium

1 ZIP

B

Brownsville

1 ZIP

C

Butler

1 ZIP

C

Campbellsport

1 ZIP

C

City A-Z Directory — Wisconsin

Browse water quality reports for every town and city in Wisconsin.

A
AbbotsfordAbramsAdamsAdellAftonAlbanyAlgomaAllentonAlmaAlma CenterAlmenaAlmondAltoonaAmbergAmeryAmherstAmherst JunctionAniwaAntigoAppletonArcadiaArenaArgonneArgyleArkansawArkdaleArlingtonArmstrong CreekArpinAshippunAshlandAthelstaneAthensAuburndaleAugustaAvalonAvoca
B
BabcockBagleyBaileys HarborBaldwinBalsam LakeBancroftBangorBarabooBarneveldBarronBarronettBassettBay CityBayfieldBear CreekBeaver DamBeetownBeldenvilleBelgiumBellevilleBelmontBeloitBenet LakeBenoitBentonBerlinBig BendBig FallsBirchwoodBirnamwoodBlack CreekBlack EarthBlack River FallsBlairBlanchardvilleBlenkerBloomerBloomingtonBlue MoundsBlue RiverBonduelBoscobelBoulder JunctionBowlerBoycevilleBoydBrandonBrantwoodBriggsvilleBrillBrillionBristolBrodheadBrokawBrookfieldBrooklynBrownsvilleBrowntownBruceBruleBrusselsBryantBurlingtonBurnettButlerButte Des MortsButternut
C
CableCadottCaledoniaCambriaCambridgeCameronCamp DouglasCamp LakeCampbellsportCarolineCascadeCascoCashtonCassvilleCataractCatawbaCazenoviaCecilCedar GroveCedarburgCenturiaChaseburgChetekChiliChiltonChippewa FallsClam LakeClaytonClear LakeClevelandClintonClintonvilleClymanCobbCochraneColbyColemanColfaxColgateCollinsColomaColumbusCombined LocksComstockConoverConrathCoon ValleyCornellCornucopiaCottage GroveCouderayCrandonCrivitzCross PlainsCuba CityCudahyCumberlandCurtissCushingCuster
D
DaleDallasDaltonDanburyDaneDarienDarlingtonDe ForestDe PereDe SotoDeer ParkDeerbrookDeerfieldDelafieldDelavanDellwoodDenmarkDickeyvilleDodgeDodgevilleDorchesterDousmanDowningDownsvilleDoylestownDresserDrummondDunbarDurand
E
EagleEagle RiverEast EllsworthEast TroyEastmanEau ClaireEau GalleEdenEdgarEdgertonEdgewaterEdmundEgg HarborElandElchoElderonEldoradoElevaElk MoundElkhart LakeElkhornEllison BayEllsworthElm GroveElmwoodElroyEltonEmbarrassEndeavorEphraimEttrickEurekaEvansvilleExeland
F
FairchildFairwaterFall CreekFall RiverFenceFennimoreFerryvilleFifieldFish CreekFlorenceFond Du LacFontanaFootvilleForest JunctionForestvilleFort AtkinsonFountain CityFox LakeFoxboroFrancis CreekFranklinFranksvilleFredericFredoniaFreedomFremontFriendshipFriesland
G
GalesvilleGallowayGays MillsGenesee DepotGenoaGenoa CityGermantownGileGillettGilmanGilmantonGleasonGlen FloraGlen HavenGlenbeulahGlenwood CityGliddenGoodmanGordonGothamGraftonGrand MarshGrand ViewGrantonGrantsburgGratiotGreen BayGreen LakeGreen ValleyGreenbushGreendaleGreenleafGreenvilleGreenwoodGresham
H
Hager CityHales CornersHammondHancockHannibalHanoverHarshawHartfordHartlandHatleyHaugenHawkinsHawthorneHaywardHazel GreenHazelhurstHeafford JunctionHelenvilleHerbsterHertelHewittHigh BridgeHighlandHilbertHillpointHillsboroHinghamHixtonHolcombeHollandaleHolmenHoney CreekHoriconHortonvilleHoultonHubertusHudsonHumbirdHurleyHustisfordHustler
I
IndependenceIolaIrmaIron BeltIron RidgeIron RiverIxonia
J
JacksonJanesvilleJeffersonJim FallsJohnson CreekJudaJump RiverJunction CityJuneau
K
KansasvilleKaukaunaKellnersvilleKendallKennanKenoshaKeshenaKewaskumKewauneeKielKielerKimberlyKingKingstonKnappKohlerKrakow
L
La CrosseLa FargeLa PointeLa ValleLac Du FlambeauLadysmithLake DeltonLake GenevaLake MillsLake NebagamonLake TomahawkLakewoodLancasterLand O LakesLannonLaonaLarsenLebanonLenaLeopolisLime RidgeLindenLittle ChuteLittle SuamicoLivingstonLodiLoganvilleLomiraLone RockLong LakeLowellLoyalLublinLuckLuxemburgLyndon StationLynxvilleLyons
M
MadisonMaiden RockMaloneManawaManitowish WatersManitowocMapleMaplewoodMarathonMarengoMaribelMarinetteMarionMarkesanMarquetteMarshallMarshfieldMasonMatherMattoonMaustonMayvilleMazomanieMc FarlandMc NaughtonMedfordMellenMelroseMenashaMenomonee FallsMenomonieMequonMercerMerrillMerrillanMerrimacMertonMiddletonMikanaMilladoreMillstonMilltownMiltonMilwaukeeMindoroMineral PointMinocquaMinongMishicotMondoviMonroeMontelloMontfortMonticelloMontrealMorrisonvilleMosineeMount CalvaryMount HopeMount HorebMount SterlingMountainMukwonagoMuscodaMuskego
N
NashotahNecedahNeenahNeillsvilleNekoosaNelsonNelsonvilleNeopitNeoshoNeshkoroNew AuburnNew BerlinNew FrankenNew GlarusNew HolsteinNew LisbonNew LondonNew MunsterNew RichmondNewburgNewtonNiagaraNicholsNorth FreedomNorth LakeNorth PrairieNorwalk
O
Oak CreekOakdaleOakfieldOconomowocOcontoOconto FallsOdanahOgdensburgOgemaOjibwaOkaucheeOmroOnalaskaOneidaOntarioOostburgOregonOrfordvilleOsceolaOshkoshOsseoOwenOxford
P
PackwaukeePalmyraPardeevillePark FallsPatch GrovePearsonPelican LakePell LakePembinePepinPeshtigoPewaukeePhelpsPhillipsPhloxPickerelPickettPigeon FallsPine RiverPittsvillePlainPlainfieldPlattevillePleasant PrairiePloverPlum CityPlymouthPoplarPort EdwardsPort WashingtonPort WingPortagePorterfieldPotosiPotterPoundPowers LakePoy SippiPoynettePrairie Du ChienPrairie Du SacPrairie FarmPrenticePrescottPresque IslePrincetonPulaski
R
RacineRadissonRandolphRandom LakeReadfieldReadstownRedgraniteReedsburgReedsvilleReesevilleReweyRhinelanderRib LakeRice LakeRichfieldRichland CenterRidgelandRidgewayRingleRioRiponRiver FallsRobertsRochesterRock FallsRock SpringsRocklandRosendaleRosholtRothschildRubiconRudolph
S
Saint CloudSaint Croix FallsSaint FrancisSaint GermainSaint NazianzSalemSand CreekSaronaSauk CitySaukvilleSaxevilleSaxonSaynerScandinaviaSchofieldSenecaSextonvilleSeymourSharonShawanoSheboyganSheboygan FallsSheldonShell LakeSherwoodShioctonShullsburgSilver LakeSinsinawaSirenSister BaySlingerSobieskiSoldiers GroveSolon SpringsSomersSomersetSouth MilwaukeeSouth RangeSouth WayneSpartaSpencerSpoonerSpring GreenSpring ValleySpringbrookSpringfieldStanleyStar LakeStar PrairieStetsonvilleSteubenStevens PointStitzerStockbridgeStockholmStoddardStone LakeStoughtonStratfordStrumSturgeon BaySturtevantSuamicoSullivanSummit LakeSun PrairieSuperiorSuringSussex
T
TaylorTheresaThiensvilleThorpThree LakesTigertonTilledaTisch MillsTomahTomahawkTonyTownsendTregoTrempealeauTrevorTripoliTunnel CityTurtle LakeTwin LakesTwo Rivers
U
Union CenterUnion GroveUnityUpson
V
ValdersVan DyneVeronaVesperViolaViroqua
W
WabenoWaldoWalesWalworthWarrensWascottWashburnWashington IslandWaterfordWaterlooWatertownWaukauWaukeshaWaunakeeWaupacaWaupunWausauWausaukeeWautomaWauzekaWebsterWest BendWest SalemWestboroWestbyWestfieldWeyauwegaWeyerhaeuserWheelerWhite LakeWhitehallWhitelawWhitewaterWild RoseWillardWilliams BayWilmotWilsonWiltonWindsorWinnebagoWinneconneWinterWisconsin DellsWisconsin RapidsWitheeWittenbergWonewocWoodfordWoodlandWoodmanWoodruffWoodvilleWoodworthWrightstownWyocena
Z
ZachowZenda

🏆 Highest Rated ZIP Codes in Wisconsin

53020Elkhart Lake
83/100
B
53021Fredonia
83/100
B
53044Kohler
83/100
B
53075Random Lake
83/100
B
53093Waldo
83/100
B

⚠ Lowest Rated ZIP Codes in Wisconsin

53039Juneau
24/100
F
53094Watertown
28/100
F
53098Watertown
28/100
F
54645Mount Sterling
28/100
F
54404Marshfield
32/100
F

Common Drinking Water Contaminants in Wisconsin

The following are common regulated contaminants found in Wisconsin drinking water based on EPA violation records. Click any contaminant to learn about EPA safety limits and health effects.

Stage 2 DBP RuleGross BetaContaminant 0700Chlorine residualStage 1 DBP RuleConsumer Confidence Report RuleGross AlphaBarium

Source: EPA Safe Drinking Water Act Maximum Contaminant Level regulations. For the complete list of regulated contaminants and MCLs, see the Water Quality Safety Guide.

Frequently Asked Questions — Wisconsin Drinking Water

Is tap water generally safe to drink in Wisconsin?+
Yes, for the majority of residents, tap water in Wisconsin is treated and regulated. However, compliance varies by city. State-wide, 0 ZIP codes receive an "A" grade, while 8 receive an "F". Search your specific ZIP code to see your local utility's record.
How do I test water quality or well water in Wisconsin?+
Residents in Wisconsin can test their tap or well water by contacting laboratories certified by Wisconsin Department of Natural Resources or ordering an EPA-standard laboratory water testing kit. Annual testing is recommended for private wells to test for bacteria, nitrates, and heavy metals.
What are the biggest water quality issues in Wisconsin?+
The primary issues include managing 816 health-based violations state-wide and resolving infrastructure age. 65.7% of ZIP codes in the state have a high probability of lead exposure risk due to pre-1986 piping.
Who regulates and enforces drinking water standards in Wisconsin?+
Drinking water in Wisconsin is regulated by Wisconsin Department of Natural Resources under a primacy agreement with the U.S. EPA.
Where does Wisconsin get its drinking water?+
Approximately 14.5% of monitored areas in Wisconsin rely on surface water sources (lakes/rivers), while the rest use groundwater aquifers.
How do I find the official water quality report for my home in Wisconsin?+
Search your ZIP code on our site to view data compiled from EPA records, or contact your local utility for their annual Consumer Confidence Report (CCR).
View All 898 ZIP Codes in Wisconsin

Browse EPA water quality data for every monitored ZIP code. For faster results, use the search bar above.

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All 898 ZIP codes in Wisconsin are actively monitored under the EPA Safe Drinking Water Act.