Montana water providers

Find published drinking-water records, providers, and official agency resources for Montana. Review sources, sample dates, and coverage.

Official drinking-water resources

• Montana Department of Environmental Quality - Public Water Supply Bureau
• Montana Drinking Water Watch
• Montana DEQ — PFAS sampling information

The responsible agency may differ for tribal systems. Record availability and sample dates vary by provider.

Community systems appear first. Sort: Population served · A–Z

Public water systems

2,350 systems in the imported directory. Includes community systems, schools, workplaces, and other public systems.

• City of BillingsMT0000153 · CWS · Population served: 114,000
• Missoula WaterMT0000294 · CWS · Population served: 68,200
• City of Great FallsMT0000525 · CWS · Population served: 60,000
• City of BozemanMT0000161 · CWS · Population served: 56,000
• Butte Silverbow Water DeptMT0000170 · CWS · Population served: 33,000
• Helena Water SystemMT0000241 · CWS · Population served: 32,091
• Kalispell Public WorksMT0000259 · CWS · Population served: 25,000
• Billings Heights Co Water Dist ofMT0000155 · CWS · Population served: 12,000
• City of BelgradeMT0000136 · CWS · Population served: 10,460
• City of WhitefishMT0000357 · CWS · Population served: 10,418
• City of HavreMT0000524 · CWS · Population served: 9,921
• Town of West YellowstoneMT0003136 · CWS · Population served: 9,899
• City of Miles CityMT0000291 · CWS · Population served: 9,565
• Malmstrom Air Force BaseMT0000515 · CWS · Population served: 8,850
• Flathead County Water And SewerMT0001744 · CWS · Population served: 7,775
• City of LivingstonMT0000573 · CWS · Population served: 7,500
• Anaconda Water DepartmentMT0000016 · CWS · Population served: 6,750
• Laurel Municipal Water SystemMT0000270 · CWS · Population served: 6,339
• Bigfork County Water And SewerMT0000262 · CWS · Population served: 6,100
• City of LewistownMT0000271 · CWS · Population served: 5,923
• Lockwood Water And Sewer DistrictMT0000156 · CWS · Population served: 5,900
• City of HamiltonMT0000234 · CWS · Population served: 5,660
• City of PolsonMT0000308 · CWS · Population served: 5,300
• City of SidneyMT0000330 · CWS · Population served: 5,000
• City of LibbyMT0000274 · CWS · Population served: 4,892
• City of GlendiveMT0000229 · CWS · Population served: 4,873
• Town of Browning083090091 · CWS · Population served: 4,671
• City of Columbia FallsMT0000181 · CWS · Population served: 4,450
• North Star Zoot WaterMT0004284 · CWS · Population served: 4,323
• City of DillonMT0000201 · CWS · Population served: 4,300
• River Rock County Water And Sewer DistMT0004082 · CWS · Population served: 4,200
• Big Sky County Water And Sewer Dist 363MT0002385 · CWS · Population served: 4,132
• City of ShelbyMT0000328 · CWS · Population served: 3,970
• City of HardinMT0000235 · CWS · Population served: 3,500
• Lolo Water And Sewer DistMT0000278 · CWS · Population served: 3,315
• City of GlasgowMT0000415 · CWS · Population served: 3,253
• City of Cut BankMT0000193 · CWS · Population served: 3,105
• City of Poplar083090051 · CWS · Population served: 3,025
• Dry Prairie Rural Water AuthorityMT0004348 · CWS · Population served: 3,005
• City of Wolf Point083090058 · CWS · Population served: 3,000
• City of Deer LodgeMT0000197 · CWS · Population served: 2,900
• Lame Deer Water System083090064 · CWS · Population served: 2,605
• Fort Belknap Agency Water System083090041 · CWS · Population served: 2,600
• Conrad Water DeptMT0000186 · CWS · Population served: 2,500
• City of RonanMT0000318 · CWS · Population served: 2,483
• Big Mountain Water CompanyMT0000060 · CWS · Population served: 2,435
• City of ColstripMT0000180 · CWS · Population served: 2,350
• Rae Water And Sewer Dist 313MT0000628 · CWS · Population served: 2,325
• City of ForsythMT0000215 · CWS · Population served: 2,260
• Pablo Lake County Water And Sewer DistMT0001917 · CWS · Population served: 2,175
• City of East HelenaMT0000196 · CWS · Population served: 2,114
• Montana State PrisonMT0000198 · CWS · Population served: 2,100
• City of TroyMT0000348 · CWS · Population served: 2,100
• Town of StevensvilleMT0000335 · CWS · Population served: 2,090
• Crow Agency Water System083090011 · CWS · Population served: 2,057
• Eastgate Village Sewer And WaterMT0001784 · CWS · Population served: 2,000
• Red Lodge Water DeptMT0000314 · CWS · Population served: 2,000
• Rocky Boy'S Rural Water083090075 · CWS · Population served: 2,000
• City of TownsendMT0000344 · CWS · Population served: 2,000
• Town of EurekaMT0000210 · CWS · Population served: 1,995
• Fairmont Hot Springs ResortMT0000589 · CWS · Population served: 1,965
• City of Thompson FallsMT0000341 · CWS · Population served: 1,950
• Town of ColumbusMT0000185 · CWS · Population served: 1,900
• Roundup Water DepartmentMT0000321 · CWS · Population served: 1,900
• City of Three ForksMT0000343 · CWS · Population served: 1,900
• City of BakerMT0000021 · CWS · Population served: 1,858
• City of MaltaMT0000284 · CWS · Population served: 1,800
• Town of ManhattanMT0000285 · CWS · Population served: 1,800
• Sun Prairie Village CountyMT0000521 · CWS · Population served: 1,800
• Assiniboine & Sioux Rural Water System083090050 · CWS · Population served: 1,726
• Hill County Water DistrictsMT0000249 · CWS · Population served: 1,720
• Town of PlainsMT0000305 · CWS · Population served: 1,700
• Plentywood Water DepartmentMT0000306 · CWS · Population served: 1,700
• City of ChoteauMT0000175 · CWS · Population served: 1,691
• City of Big TimberMT0000463 · CWS · Population served: 1,650
• Seeley Lake Water DistrictMT0000327 · CWS · Population served: 1,575
• Two Medicine Water - East Glacier083090090 · CWS · Population served: 1,504
• City of Fort BentonMT0000216 · CWS · Population served: 1,500
• Virginia City Water DeptMT0000353 · CWS · Population served: 1,500
• Town of WhitehallMT0000359 · CWS · Population served: 1,500
• Rocky Boy Agency Water System083090079 · CWS · Population served: 1,442
• City of BoulderMT0000158 · CWS · Population served: 1,400
• Town of EnnisMT0000208 · CWS · Population served: 1,400
• Town of PhilipsburgMT0000304 · CWS · Population served: 1,360
• El Mar Estates Msla Co WaterMT0000517 · CWS · Population served: 1,350
• City of ChinookMT0000174 · CWS · Population served: 1,300
• Va Medical Center HelenaMT0000246 · CWS · Population served: 1,275
• Black Eagle Cascade County Water SewerMT0000157 · CWS · Population served: 1,233
• Lakeside Water SystemMT0000266 · CWS · Population served: 1,225
• Forest Park Water Rsid 24MT0000233 · CWS · Population served: 1,200
• Helena Leisure LLCMT0000590 · CWS · Population served: 1,200
• Hungry Horse Co Water And Sewer DistrictMT0000253 · CWS · Population served: 1,135
• Absarokee Water And Sewer DistMT0000003 · CWS · Population served: 1,100
• Cmrwa Musselshell Judith Rural Water SysMT0005109 · CWS · Population served: 1,100
• Town of SuperiorMT0000339 · CWS · Population served: 1,100
• City of HarlowtonMT0000240 · CWS · Population served: 1,050
• St Mary Headquarters And CgMT0002729 · CWS · Population served: 1,030
• City of ScobeyMT0000326 · CWS · Population served: 1,026
• Town of FairviewMT0000213 · CWS · Population served: 1,000
• Prairie Water CompanyMT0003539 · CWS · Population served: 1,000