State rankings
Montana water-system rankings
Lowest-scoring systems in Montana
Ranked lowest score first. Population shown for context.
1 COZY NORTHERN HOMES, LLC LIVINGSTON, MT · ~38 served 60 2 HEART BUTTE SCHOOL HEART BUTTE, MT · ~250 served 70 3 KALISPELL PUBLIC WORKS KALISPELL, MT · ~25,000 served 76 4 TWO MEDICINE WATER - EAST GLACIER BROWNING, MT · ~1,504 served 85 5 PRYOR WATER SYSTEM CROW AGENCY, MT · ~406 served 85 6 WYOLA WATER SYSTEM CROW AGENCY, MT · ~281 served 85 7 ORLAND ESTATES MOBILE H.P. BILLINGS, MT · ~244 served 85 8 BLACKFEET DORM. WATER SYSTEM BROWNING, MT · ~66 served 85 9 ALPINE VILLAGE WUA COLUMBIA FALLS, MT · ~125 served 91 10 BILLINGS CITY OF BILLINGS, MT · ~114,000 served 100 11 MISSOULA WATER MISSOULA, MT · ~68,200 served 100 12 GREAT FALLS CITY OF GREAT FALLS, MT · ~60,000 served 100 13 BOZEMAN CITY OF BOZEMAN, MT · ~56,000 served 100 14 BUTTE SILVERBOW WATER DEPT BUTTE, MT · ~33,000 served 100 15 HELENA WATER SYSTEM HELENA, MT · ~32,091 served 100 16 BILLINGS HEIGHTS CO WATER DIST OF BILLINGS, MT · ~12,000 served 100 17 BELGRADE CITY OF BELGRADE, MT · ~10,460 served 100 18 WHITEFISH CITY OF WHITEFISH, MT · ~10,418 served 100 19 HAVRE CITY OF HAVRE, MT · ~9,921 served 100 20 WEST YELLOWSTONE TOWN OF WEST YELLOWSTONE, MT · ~9,899 served 100 21 MILES CITY CITY OF MILES CITY, MT · ~9,565 served 100 22 MALMSTROM AIR FORCE BASE MALMSTROM AIR FORCE BASE, MT · ~8,850 served 100 23 FLATHEAD COUNTY WATER AND SEWER KALISPELL, MT · ~7,775 served 100 24 LIVINGSTON CITY OF LIVINGSTON, MT · ~7,500 served 100 25 ANACONDA WATER DEPARTMENT ANACONDA, MT · ~6,750 served 100
Highest-scoring large systems in Montana
Systems serving 10,000+ people with the best scores.
1 BILLINGS CITY OF BILLINGS, MT · ~114,000 served 100 2 MISSOULA WATER MISSOULA, MT · ~68,200 served 100 3 GREAT FALLS CITY OF GREAT FALLS, MT · ~60,000 served 100 4 BOZEMAN CITY OF BOZEMAN, MT · ~56,000 served 100 5 BUTTE SILVERBOW WATER DEPT BUTTE, MT · ~33,000 served 100 6 HELENA WATER SYSTEM HELENA, MT · ~32,091 served 100 7 BILLINGS HEIGHTS CO WATER DIST OF BILLINGS, MT · ~12,000 served 100 8 BELGRADE CITY OF BELGRADE, MT · ~10,460 served 100
Scores reflect EPA public records (violations, enforcement, PFAS), are system-level, and can’t account for your home’s plumbing. See the methodology.