| Public water system | Population served |
|---|---|
| BILLINGS CITY OF | 114,000 |
| MISSOULA WATER | 68,200 |
| GREAT FALLS CITY OF | 60,000 |
| BOZEMAN CITY OF | 56,000 |
| BUTTE SILVERBOW WATER DEPT | 33,000 |
| HELENA WATER SYSTEM | 32,091 |
| KALISPELL PUBLIC WORKS | 25,000 |
| BILLINGS HEIGHTS CO WATER DIST OF | 12,000 |
| BELGRADE CITY OF | 10,460 |
| WHITEFISH CITY OF | 10,418 |
| HAVRE CITY OF | 9,921 |
| WEST YELLOWSTONE TOWN OF | 9,899 |
| MILES CITY CITY OF | 9,565 |
| MALMSTROM AIR FORCE BASE | 8,850 |
| FLATHEAD COUNTY WATER AND SEWER | 7,775 |
| LIVINGSTON CITY OF | 7,500 |
| ANACONDA WATER DEPARTMENT | 6,750 |
| LAUREL MUNICIPAL WATER SYSTEM | 6,339 |
| BIGFORK COUNTY WATER AND SEWER | 6,100 |
| LEWISTOWN CITY OF | 5,923 |
| LOCKWOOD WATER AND SEWER DISTRICT | 5,900 |
| HAMILTON CITY OF | 5,660 |
| POLSON CITY OF | 5,300 |
| SIDNEY CITY OF | 5,000 |
| LIBBY CITY OF | 4,892 |
| GLENDIVE CITY OF | 4,873 |
| COLUMBIA FALLS CITY OF | 4,450 |
| DILLON CITY OF | 4,300 |
| BIG SKY COUNTY WATER AND SEWER DIST 363 | 4,132 |
| SHELBY CITY OF | 3,970 |
| HARDIN CITY OF | 3,500 |
| LOLO WATER AND SEWER DIST | 3,315 |
Largest first by population served, as each employer reports it to its federal registry.
Source: U.S. Environmental Protection Agency, Safe Drinking Water Information System (SDWIS/Fed), community water systems. Data captured October 2, 2026.
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