Public Water Systems
2,263 active water systems in MT.
| System Name | Location | Population | Violations | PFAS |
|---|---|---|---|---|
| BILLINGS CITY OF | BILLINGS, MT | 114,000 | 4 | Detected |
| MISSOULA WATER | MISSOULA, MT | 68,200 | 84 | Detected |
| GREAT FALLS CITY OF | GREAT FALLS, MT | 60,000 | 26 | Detected |
| BOZEMAN CITY OF | BOZEMAN, MT | 56,000 | 17 | Clean |
| BUTTE SILVERBOW WATER DEPT | BUTTE, MT | 33,000 | 334 | Clean |
| HELENA WATER SYSTEM | HELENA, MT | 32,091 | 68 | Detected |
| KALISPELL PUBLIC WORKS | KALISPELL, MT | 25,000 | 224 | Detected |
| MONTANA STATE UNIVERSITY BOZEMAN | BOZEMAN, MT | 19,200 | 0 | Clean |
| UNIVERSITY OF MONTANA | MISSOULA, MT | 15,000 | 26 | Detected |
| CO WATER DIST OF BILLINGS HEIGHTS | BILLINGS, MT | 12,000 | 11 | Detected |
| BELGRADE CITY OF | BELGRADE, MT | 10,460 | 285 | Clean |
| WHITEFISH CITY OF | WHITEFISH, MT | 10,418 | 102 | Clean |
| HAVRE CITY OF | HAVRE, MT | 9,921 | 76 | Detected |
| WEST YELLOWSTONE TOWN OF | WEST YELLOWSTONE, MT | 9,899 | 203 | Detected |
| MILES CITY CITY OF | MILES CITY, MT | 9,565 | 80 | Detected |
| MALMSTROM AIR FORCE BASE | MALMSTROM AIR FORCE BASE, MT | 8,850 | 82 | Detected |
| FLATHEAD COUNTY WATER AND SEWER | KALISPELL, MT | 7,775 | 19 | Clean |
| LIVINGSTON CITY OF | LIVINGSTON, MT | 7,500 | 980 | Detected |
| ANACONDA WATER DEPARTMENT | ANACONDA, MT | 6,750 | 58 | Clean |
| LAUREL MUNICIPAL WATER SYSTEM | LAUREL, MT | 6,339 | 141 | Detected |
| BIGFORK COUNTY WATER AND SEWER | BIGFORK, MT | 6,100 | 43 | Detected |
| LEWISTOWN CITY OF | LEWISTOWN, MT | 5,923 | 512 | Clean |
| LOCKWOOD WATER AND SEWER DISTRICT | BILLINGS, MT | 5,900 | 12 | Detected |
| ROCKY MOUNTAIN COLLEGE | BILLINGS, MT | 5,700 | 9 | Detected |
| HAMILTON CITY OF | HAMILTON, MT | 5,585 | 18 | Detected |
| POLSON CITY OF | POLSON, MT | 5,300 | 242 | Clean |
| SIDNEY CITY OF | SIDNEY, MT | 5,000 | 6 | Detected |
| LIBBY CITY OF | LIBBY, MT | 4,892 | 341 | Clean |
| GLENDIVE CITY OF | GLENDIVE, MT | 4,873 | 278 | Detected |
| COLUMBIA FALLS CITY OF | COLUMBIA FALLS, MT | 4,450 | 99 | Clean |
| NORTH STAR ZOOT WATER | BOZEMAN, MT | 4,323 | 16 | — |
| DILLON CITY OF | DILLON, MT | 4,300 | 16 | Detected |
| RIVER ROCK COUNTY WATER AND SEWER DIST | BELGRADE, MT | 4,200 | 176 | Clean |
| BIG SKY COUNTY WATER AND SEWER DIST 363 | BIG SKY, MT | 4,132 | 97 | Detected |
| SHELBY CITY OF | SHELBY, MT | 3,970 | 59 | Detected |
| HARDIN CITY OF | HARDIN, MT | 3,500 | 63 | Detected |
| RIDGE RUN | COLUMBIA FALLS, MT | 3,500 | 15 | — |
| LOLO WATER AND SEWER DIST | LOLO, MT | 3,315 | 92 | — |
| QUARTZ FLAT REST STOP EAST | MISSOULA, MT | 3,301 | 52 | — |
| QUARTZ FLAT REST STOP WEST | MISSOULA, MT | 3,301 | 43 | — |
| GLASGOW CITY OF | GLASGOW, MT | 3,253 | 51 | — |
| MONTANA TECHNOLOGICAL UNIVERSITY | BUTTE, MT | 3,200 | 179 | — |
| CUT BANK CITY OF | CUT BANK, MT | 3,105 | 197 | — |
| SOURCE GIANT SPRINGS INC | GREAT FALLS, MT | 3,007 | 18 | — |
| DRY PRAIRIE RURAL WATER AUTHORITY | CULBERTSON, MT | 3,005 | 49 | — |
| DENA MORA SALTESE EAST REST | MISSOULA, MT | 3,000 | 74 | — |
| MONTANA STATE UNIVERSITY BILLINGS | BILLINGS, MT | 2,999 | 0 | Detected |
| DEER LODGE CITY OF | DEER LODGE, MT | 2,900 | 147 | — |
| GLACIER PARK INTERNATIONAL AIRPORT | KALISPELL, MT | 2,680 | 31 | — |
| LEHRKINDS BIG SPRING WATER | BOZEMAN, MT | 2,575 | 45 | — |
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