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WaterSafeCheck
Official EPA SDWIS Statewide AnalysisState Water Quality & Testing Directory

Montana Drinking Water Quality & Testing Directory

Comprehensive EPA compliance records, water testing guidelines, and city rankings covering all 405 ZIP codes across Montana

Quick Summary: Is Tap Water Safe in Montana?

Drinking water in Montana receives an average composite safety score of 55.1/100 based on EPA Safe Drinking Water Act records. Approximately 0% of monitored ZIP codes earn an "A" grade. Water sources are 34.8% surface water and 65.2% groundwater, resulting in Hard to Very Hard mineral hardness across the state.

Total ZIP Codes

405

Health Violations (5yr)

431

Statewide Avg Score

55.1/100

High Lead Risk Areas

60.7%

Overview: Drinking Water in Montana

Drinking water quality in Montana averages a composite safety score of 55.1/100 across its 405 monitored ZIP codes. Approximately 0% of ZIP codes in the state receive an "A" grade, while 3% receive an "F" grade. Environmental standards are enforced by Montana Department of Environmental Quality.

Surface Water

34.8%

of ZIP codes

Total Violations

2,102

5-year record

Grade A ZIPs

0

0% of state

Grade F ZIPs

14

3% of state

Water Quality Grade Distribution in Montana

How do Montana's 405 ZIP codes stack up by water quality grade?

A
0 ZIP codes0%
B
49 ZIP codes12%
C
164 ZIP codes40%
D
178 ZIP codes44%
F
14 ZIP codes3%

Popular Cities in Montana

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

Billings

14 ZIPs

B

Helena

8 ZIPs

F

Missoula

8 ZIPs

C

Bozeman

7 ZIPs

C

Great Falls

5 ZIPs

C

Butte

5 ZIPs

C

Kalispell

3 ZIPs

C

Ashland

2 ZIPs

F

Roundup

2 ZIPs

D

Absarokee

1 ZIP

C

Acton

1 ZIP

D

Ballantine

1 ZIP

D

Bearcreek

1 ZIP

D

Belfry

1 ZIP

B

Bighorn

1 ZIP

D

Big Timber

1 ZIP

B

Birney

1 ZIP

D

Boyd

1 ZIP

D

Bridger

1 ZIP

C

Broadview

1 ZIP

C

Busby

1 ZIP

D

Clyde Park

1 ZIP

C

Columbus

1 ZIP

C

Cooke City

1 ZIP

C

Crow Agency

1 ZIP

D

Custer

1 ZIP

C

Decker

1 ZIP

D

Edgar

1 ZIP

D

Emigrant

1 ZIP

C

Fishtail

1 ZIP

D

Fromberg

1 ZIP

C

Gardiner

1 ZIP

B

Garryowen

1 ZIP

D

Grass Range

1 ZIP

C

Greycliff

1 ZIP

B

Hardin

1 ZIP

C

Fort Smith

1 ZIP

F

Harlowton

1 ZIP

B

Huntley

1 ZIP

B

Hysham

1 ZIP

C

City A-Z Directory — Montana

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

A
AbsarokeeActonAlbertonAlderAlzadaAnacondaAngelaAntelopeArleeAshlandAugustaAvon
B
BabbBainvilleBakerBallantineBasinBearcreekBelfryBelgradeBeltBiddleBig ArmBig SandyBig SkyBig TimberBigforkBighornBillingsBirneyBlack EagleBloomfieldBonnerBoulderBox ElderBoydBoyesBozemanBradyBridgerBroadusBroadviewBrocktonBrockwayBrowningBrusettBuffaloBusbyButteBynum
C
CameronCanyon CreekCapitolCardwellCarterCascadeCharloChesterChinookChoteauCircleClancyClintonClyde ParkCoffee CreekCohagenColstripColumbia FallsColumbusCondonConnerConradCooke CityCoramCorvallisCraneCrow AgencyCulbertsonCusterCut Bank
D
DagmarDarbyDaytonDe BorgiaDeckerDeer LodgeDellDentonDillonDivideDixonDodsonDrummondDupuyerDutton
E
East Glacier ParkEast HelenaEdgarEkalakaEllistonElmoEmigrantEnnisEssexEthridgeEureka
F
FairfieldFairviewFallonFishtailFlaxvilleFlorenceFlowereeForest GroveForsythFort BentonFort HarrisonFort PeckFort ShawFort SmithFortineFrazerFrenchtownFroidFromberg
G
GalataGallatin GatewayGardinerGarrisonGarryowenGeraldineGeyserGildfordGlasgowGlenGlendiveGlentanaGold CreekGrantsdaleGrass RangeGreat FallsGreycliff
H
HallHamiltonHammondHardinHarlemHarlowtonHarrisonHathawayHauganHavreHaysHeart ButteHelenaHelmvilleHeronHighwoodHilgerHinghamHinsdaleHobsonHogelandHomesteadHot SpringsHungry HorseHuntleyHusonHysham
I
IngomarInvernessIsmay
J
JacksonJefferson CityJolietJoplinJordanJudith Gap
K
KalispellKevinKilaKinseyKremlin
L
Lake Mc DonaldLakesideLambertLame DeerLarslanLaurelLavinaLedgerLewistownLibbyLimaLincolnLindsayLivingstonLloydLodge GrassLoloLomaLonepineLoringLothair
M
Malmstrom A F BMaltaManhattanMarionMartin CityMartinsdaleMarysvilleMc AllisterMc LeodMedicine LakeMelroseMelstoneMelvilleMildredMiles CityMilltownMissoulaMoccasinMoltMonarchMooreMosbyMusselshell
N
NashuaNeihartNorrisNoxonNye
O
OilmontOliveOlneyOpheimOtterOutlookOvando
P
PabloParadisePark CityPeerlessPendroyPhilipsburgPinesdalePlainsPlentywoodPlevnaPolarisPolebridgePolsonPompeys PillarPonyPoplarPowdervillePowerPrayProctorPryor
R
RadersburgRamsayRapeljeRavalliRaymondRaynesfordRed LodgeRedstoneReed PointReserveRexfordRicheyRichlandRinglingRobertsRollinsRonanRoscoeRosebudRoundupRoyRudyardRyegate
S
SacoSaint IgnatiusSaint MarieSaint RegisSaint XavierSalteseSand CouleeSand SpringsSandersSavageScobeySeeley LakeShawmutShelbyShepherdSheridanSidneySilver GateSilver StarSimmsSomersSpringdaleStanfordStevensvilleStockettStrykerSulaSumatraSun RiverSunburstSuperiorSweet Grass
T
TeigenTerryThompson FallsThree ForksTostonTownsendTregoTrout CreekTroyTurnerTwin BridgesTwo Dot
U
Ulm
V
ValierVandaliaVaughnVictorVidaVirginia CityVolborg
W
Warm SpringsWest GlacierWest YellowstoneWestbyWhite Sulphur SpringsWhitefishWhitehallWhitetailWhitewaterWhitlashWibauxWillardWillow CreekWilsallWinifredWinnettWinstonWisdomWise RiverWolf CreekWolf PointWordenWyola
Z
ZortmanZurich

🏆 Highest Rated ZIP Codes in Montana

59011Big Timber
83/100
B
59033Greycliff
83/100
B
59055Melville
83/100
B
59059Musselshell
83/100
B
59085Two Dot
83/100
B

⚠ Lowest Rated ZIP Codes in Montana

59542Turner
22/100
F
59484Sweet Grass
28/100
F
59003Ashland
33/100
F
59004Ashland
33/100
F
59035Fort Smith
33/100
F

Common Drinking Water Contaminants in Montana

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

Contaminant 0700Stage 1 DBP RuleConsumer Confidence Report RuleArsenicTotal Trihalomethanes (TTHM)E. coliHaloacetic Acids (HAA5)Fecal Coliform

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 — Montana Drinking Water

Is tap water generally safe to drink in Montana?+
Yes, for the majority of residents, tap water in Montana is treated and regulated. However, compliance varies by city. State-wide, 0 ZIP codes receive an "A" grade, while 14 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 Montana?+
Residents in Montana can test their tap or well water by contacting laboratories certified by Montana Department of Environmental Quality 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 Montana?+
The primary issues include managing 431 health-based violations state-wide and resolving infrastructure age. 60.7% 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 Montana?+
Drinking water in Montana is regulated by Montana Department of Environmental Quality under a primacy agreement with the U.S. EPA.
Where does Montana get its drinking water?+
Approximately 34.8% of monitored areas in Montana 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 Montana?+
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 405 ZIP Codes in Montana

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

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All 405 ZIP codes in Montana are actively monitored under the EPA Safe Drinking Water Act.