North Dakota tap water quality

320 active community water systems.

Largest water systems

GradeSystemPeopleHealth violations (5y)
ACity of Fargo120,7620
ACity of Bismarck72,4170
AGrand Forks Regional WTP57,3390
ACity of Minot48,7430
ACity of West Fargo34,8580
ACity of Williston26,4260
ACity of Dickinson25,6790
ACity of Mandan21,7690
ACity of Jamestown15,4270
CBelcourt-Turtle Mtn Rural Water System13,5001
ASouth Central Rwd North Burleigh10,4000
ASouthwest Water Authority8,5370
ACity of Wahpeton7,7660
ANorth Prairie Rwd-System 1&27,7480
ACity of Devils Lake7,1410
CStanding Rock Rural Water System6,8391
ACity of Valley City6,5850
ACity of Watford City6,3900
AEast Central Regional Wd-Gf5,9950
AStutsman Rural Water District5,5500
AGreater Ramsey Water District5,2800
ANorthwest Rural Water District5,1020
ABarnes Rural Water District4,9380
ASpirit Lake Water Management RWS4,4000
AMissouri West Water System4,3030
ACity of Grafton4,2840
ACity of Lincoln4,2570
ACass Rural Water District Fargo4,2420
ASoutheast WUD (East)4,2250
AOmnd Water Treatment Plant4,1680
AMcKenzie County Wrd3,8950
ASouth Central Regional Water District3,7000
ACass Rural Water District-Phase I3,6580
ASouth Central Rwd-Emmons3,6500
ACentral Plains Water District3,5040
AAgassiz Water Users District3,4380
ANortheast Rwd- North Valley Branch3,4220
ACity of Beulah3,0580
AWalsh Rural Water District3,0000
ACity of Rugby2,8760
AEast Central Regional Wd-Traill2,8000
ANorth Prairie Rwd-System III2,7420
BCity of New Town2,5280
ACity of Casselton2,5130
ATri-County Water District2,5010
ANortheast Rwd-Langdon Branch2,4500
ACity of Hazen2,4110
CDakota Magic Casino2,3601
ACity of Bottineau2,2110
ACity of Tioga2,2020

Most issues (systems serving 10,000+)

C

Belcourt-Turtle Mtn Rural Water System

Serves 13,500 people · Groundwater · Full report →
1 health-based violation in the last 5 years; 44 monitoring/reporting violations; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2026).
A

City of Minot

Serves 48,743 people · Groundwater · 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 new 10 ppb action level (LCRI, effective Nov 1, 2027); Lead 90th percentile below the action level (2024).
A

City of Fargo

Serves 120,762 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 below the action level (2023).
A

City of Bismarck

Serves 72,417 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 below the action level (2024).
A

Grand Forks Regional WTP

Serves 57,339 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 below the action level (2024).
A

City of West Fargo

Serves 34,858 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 below the action level (2023).
A

City of Williston

Serves 26,426 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 below the action level (2023).
A

City of Dickinson

Serves 25,679 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 below the action level (2025).
A

City of Mandan

Serves 21,769 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 below the action level (2023).
A

City of Jamestown

Serves 15,427 people · Groundwater · Full report →
No health-based violations in the last 5 years; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile above the new 10 ppb action level (LCRI, effective Nov 1, 2027); Lead 90th percentile below the action level (2023).
A

South Central Rwd North Burleigh

Serves 10,400 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 below the action level (2024).

Cities

AbercrombieAdamsAlamoAlexanderAlmontAlsenAmbroseAmeniaAmidonAnamooseAnetaAntlerArgusvilleArnegardArthurArvillaAshleyBaldwinBalfourBarneyBathgateBeachBelcourtBelfieldBenedictBerlinBertholdBeulahBinfordBisbeeBismarckBlanchardBottineauBowbellsBowdonBowmanBraddockBrocketBuchananBuffaloBurlingtonButteBuxtonCaledoniaCalvinCandoCannon BallCarpioCarringtonCarsonCartwrightCasseltonCathayCavalierCayugaCenterChaseleyChristineChurchs FerryClevelandCliffordCogswellColeharborColfaxColumbusCooperstownCourtenayCraryCrosbyCrystalCummingsDahlenDavenportDawsonDazeyDeeringDes LacsDevils LakeDickeyDickinsonDodgeDonnybrookDouglasDrakeDraytonDriscollDunn CenterDunseithEdgeleyEdinburgEdmoreEgelandElginEllendaleEmeradoEnderlinEppingFairdaleFairfieldFairmountFargoFessendenFingalFinleyFlasherFlaxtonForbesFordvilleForest RiverFormanFort RansomFort TottenFort YatesFortunaFullertonGackleGalesburgGardnerGarrisonGilbyGladstoneGlasstonGlen UllinGlenburnGlenfieldGolden ValleyGolden Valley (Corporate and NGolvaGoodrichGrace CityGraftonGrand ForksGrand Forks AfbGrandinGranvilleGrassy ButteGrenoraGwinnerHagueHallidayHamiltonHampdenHankinsonHannafordHannahHarveyHarwoodHattonHavanaHazeltonHazenHebronHenselHettingerHillsboroHoopleHopeHoraceHunterHurdsfieldInksterJamestownJudKarlsruheKathrynKeeneKenmareKensalKilldeerKindredKulmLA MoureLakotaLamoureLangdonLankinLansfordLarimoreLawtonLeedsLeforLehrLeonardLidgerwoodLigniteLincolnLintonLisbonLitchvilleLuverneMaddockMakotiMandanMandareeManningMantadorManvelMapletonMarionMarmarthMartinMaxMaxbassMayvilleMcCluskyMcgregorMchenryMcleodMcVilleMedinaMedoraMekinockMenokenMercerMichiganMichigan City (Corporate NameMilnorMiltonMinnewaukanMinotMintoMohallMonangoMontpelierMooretonMottMountainMunichNapoleonNecheNekomaNew EnglandNew HradecNew LeipzigNew RockfordNew SalemNew TownNiagaraNomeNoonanNorthwoodNorwichOakesOberonOriskaOsnabrockOxbowPagePalermoPark RiverParshallPembinaPennPetersburgPettibonePick CityPingreePisekPlazaPortalPortlandPowers LakeRaleighRayReederReganRegentReynoldsRhameRichardtonRiverdaleRobinsonRocklakeRocklake (Corporate Name for RRogersRoletteRollaRoseglenRossRugbyRusoRutlandRyderSaint AnthonySaint JohnSaint MichaelSaint ThomasSanbornSarlesSawyerScrantonSelfridgeSentinel ButteSharonSheldonSherwoodSheyenneSibleySolenSourisSouth HeartSpiritwoodSt. JohnSt. ThomasStanleyStantonStarkweatherSteeleSterlingStirumStrasburgStreeterSurreySuttonSykestonTappenTaylorThompsonTiogaTokioTolnaTower CityTownerTrentonTurtle LakeTuttleUnderwoodUphamValley CityVelvaVeronaVoltaireWahpetonWalcottWalesWalhallaWarwickWashburnWatford CityWebsterWest FargoWesthopeWheatlandWhite EarthWildroseWillistonWillow CityWiltonWimbledonWingWishekWoodworthWyndmereYpsilantiZahlZapZeeland