Montana utilities 501 to 600.
Each serves 55 to 80 people, as it reports to EPA. Your ZIP code finds yours faster.
501 to 600 of 754, by people served
| Utility | Based in | Serves | Regulated PFAS | Health-based violations since 2016 |
|---|---|---|---|---|
| Glacier Colony | Cut Bank | 80 | Not sampled | 0 |
| Grassland Colony | Sand Coulee | 80 | Not sampled | 0 |
| Hidden Lake Colony | Cut Bank | 80 | Not sampled | 2 |
| Hidden Valley Colony | Gildford | 80 | Not sampled | 0 |
| Jefferson Tracts Assoc Inc | Clancy | 80 | Not sampled | 0 |
| Mission Mountain View HOA | Ronan | 80 | Not sampled | 1 |
| Mitchell Court Apartments | Billings | 80 | Not sampled | 0 |
| Outback Mobile Home Settlement | Whitefish | 80 | Not sampled | 0 |
| Red Sky Mobile Home Community | Vaughn | 80 | Not sampled | 0 |
| South Chouteau County Water Dist | Highwood | 80 | Not sampled | 1 |
| Spring Tree Ridge | Great Falls | 80 | Not sampled | 1 |
| Sunny Brook Colony | Chester | 80 | Not sampled | 0 |
| Surprise Creek Colony | Stanford | 80 | Not sampled | 0 |
| Hilldale Colony | Havre | 79 | Not sampled | 0 |
| Ruger Water District | Helena | 79 | Not sampled | 0 |
| Big Pines Trailer Court | Missoula | 78 | None found | 0 |
| River Acres Inc | Missoula | 78 | Not sampled | 1 |
| Twin Hills Colony Inc | Carter | 78 | Not sampled | 8 |
| Gateway Village System 7 | Gallatin Gateway | 77 | Not sampled | 0 |
| High Country MHP LLC | Paradise | 76 | Not sampled | 1 |
| Arrow Creek Trailer Court | Billings | 75 | Not sampled | 8 |
| Ashley Hills HOA | Marion | 75 | Not sampled | 0 |
| Aspen Knoll | Kalispell | 75 | Not sampled | 0 |
| Barnaby Lake HOA | Eureka | 75 | Not sampled | 0 |
| Black Rock Estates Subdivision | Billings | 75 | None found | 0 |
| Blue Mountain Trailer CT | Missoula | 75 | Not sampled | 0 |
| Bluebird Mb Hm Park Hamilton | Hamilton | 75 | Not sampled | 0 |
| Bridger Base Water System | Bozeman | 75 | Not sampled | 0 |
| Cool Spring Colony | Rudyard | 75 | Not sampled | 0 |
| Dakota Valley Mobile Home Park | East Helena | 75 | Not sampled | 0 |
| Devon Water Inc | Shelby | 75 | Not sampled | 2 |
| Hideaway Tr Pk Columbia Falls | Columbia Falls | 75 | Not sampled | 0 |
| Martinsdale Water and Sewer District | Martinsdale | 75 | Not sampled | 0 |
| McDonald Trailer CT | East Helena | 75 | Not sampled | 1 |
| Midway Townhomes WUA | Billings | 75 | Not sampled | 0 |
| Musselshell Community County WSD | Musselshell | 75 | Not sampled | 0 |
| Skyline Tr CT and Rv Park | Dillon | 75 | Not sampled | 2 |
| Sunset Colony Unapproved | Roundup | 75 | Not sampled | 0 |
| Tamarack Court | Missoula | 75 | Not sampled | 5 |
| Western Mobile Village Dillon | Dillon | 75 | Not sampled | 0 |
| Hartland Colony | Havre | 73 | Not sampled | 1 |
| Montana Trailer Court | Missoula | 73 | Not sampled | 0 |
| Turah Meadows | Missoula | 73 | Not sampled | 0 |
| Barnett Water Users System | Helena | 70 | Not sampled | 0 |
| Big Sky Trailer CT Hamilton | Hamilton | 70 | Not sampled | 0 |
| Clear View Academy | Heron | 70 | Not sampled | 0 |
| Deer Lick Subdivision Water District | Haugan | 70 | Not sampled | 0 |
| Duck Creek Mobile Home Park | Billings | 70 | Not sampled | 3 |
| Emerald Heights HOA Water & Sewer Dist | Whitefish | 70 | Not sampled | 0 |
| Gateway Village System 5 | Gallatin Gateway | 70 | Not sampled | 0 |
| Gildford Colony | Gildford | 70 | Not sampled | 0 |
| King Ranch Subdivision | Frenchtown | 70 | Not sampled | 1 |
| Ponderosa Mb Home Subd | Bozeman | 70 | Not sampled | 0 |
| Rapelje Water District | Rapelje | 70 | Not sampled | 1 |
| Sawtooth Villa | Hamilton | 70 | Not sampled | 1 |
| Wood Ridge HOA | Kalispell | 70 | Not sampled | 0 |
| Zenith Colony | Cut Bank | 70 | Not sampled | 0 |
| Willow Glen Trailer Court Kspl | Kalispell | 69 | Not sampled | 0 |
| Gateway Village System 2 | Gallatin Gateway | 68 | Not sampled | 0 |
| Gateway Village System 3 | Gallatin Gateway | 68 | Not sampled | 0 |
| Missoula Village West Tr CT | Missoula | 68 | Not sampled | 1 |
| Glessner Trailer Court | Frenchtown | 67 | Not sampled | 0 |
| Milford Colony Inc | Wolf Creek | 67 | Not sampled | 5 |
| Big Spur Tr CT | Livingston | 65 | Not sampled | 0 |
| Carpenter Lake HOA | Eureka | 65 | Not sampled | 1 |
| Christian Childrens Ranch | St Ignatius | 65 | Not sampled | 0 |
| Forest View HOA | Florence | 65 | Not sampled | 0 |
| Hidden Heights HOA | Missoula | 65 | Not sampled | 0 |
| Hillcrest Community Water | Kalispell | 65 | Not sampled | 0 |
| North Shore Estates HOA | Thompson Falls | 65 | Not sampled | 0 |
| Panoramic Mountain River Heights W Dist | Kalispell | 65 | Not sampled | 0 |
| Sweetgrass Ranch Subdivision | Kalispell | 65 | Not sampled | 0 |
| Thomson Mobile Home Park | Belgrade | 65 | Not sampled | 0 |
| Dwaynes Village | Marion | 63 | Not sampled | 0 |
| East Valley Estates | Kalispell | 63 | Not sampled | 0 |
| South Eighty Water | Somers | 63 | Not sampled | 0 |
| Clarks Lookout | Dillon | 62 | Not sampled | 16 |
| Blue Cloud Subdivision | Helena | 60 | Not sampled | 7 |
| Blue Grass Water Users Association | Billings | 60 | Not sampled | 0 |
| Bonnie'S Place Inc | Missoula | 60 | Not sampled | 0 |
| Gateway Village System 4 | Gallatin Gateway | 60 | Not sampled | 0 |
| Halfmoon Mobile Home Park Inc | Columbia Falls | 60 | Not sampled | 0 |
| Ponderosa Mobile Home Park | Corvallis | 60 | Not sampled | 0 |
| Rivers Edge Mobile Park Libby | Libby | 60 | Not sampled | 2 |
| Sky View Estates | Kalispell | 60 | Not sampled | 0 |
| South Hills Water Users Association | Polson | 60 | Not sampled | 0 |
| Strobel Trailer Court | Big Timber | 60 | Not sampled | 0 |
| Twin Acres Trailer Court | Kalispell | 60 | Not sampled | 0 |
| Antelope County Water and Sewer | Antelope | 59 | Not sampled | 0 |
| Circle J Trailer Court | Missoula | 59 | Not sampled | 0 |
| Ayers Hutterite Colony | Grass Range | 58 | Not sampled | 0 |
| Beaverhead Jackson Water and Sewer Dist | Jackson | 58 | Not sampled | 27 |
| Bridger Pines County W and S District | Bozeman | 58 | Not sampled | 0 |
| King Ranch Colony | Lewistown | 56 | Not sampled | 24 |
| Shelter Bay Estates | Rollins | 56 | Not sampled | 0 |
| Beacon Trailer Court Helena | Helena | 55 | Not sampled | 0 |
| Chautauqua Terrace HOA | Lakeside | 55 | Not sampled | 0 |
| Edannes Mobile Home Park | Livingston | 55 | Not sampled | 0 |
| Happy Valley MHP | Missoula | 55 | Not sampled | 0 |
| Meadowlark Mobile Home Park | Kalispell | 55 | Not sampled | 0 |
Every utility EPA sampled for PFAS under UCMR 5, any other community system serving 3,300 people or more, and any smaller one with results from 2020 on, from the state. Other systems appear in ZIP code results. People served is what each utility reports to EPA. Data: EPA SDWIS 2026 Q3, UCMR 5 and EPA’s 2012 to 2019 compliance results, and Montana Department of Environmental Quality, Public Water Supply.
Where to go next
- Read your utility’s own reportIt covers contaminants these pages don’t show, and its own latest results.How to read it
- Every contaminantLegal limits, health goals and what handles each one.All contaminants
- Filters, checkedEvery filter TapBuff has checked against a certifier’s listing, with five-year costs.Compare filters