State rankings
Wyoming water-system rankings
Lowest-scoring systems in Wyoming
Ranked lowest score first. Population shown for context.
1 RIVERTON, CITY OF RIVERTON, WY · ~10,330 served 40 2 FORT WASHAKIE FORT WASHAKIE, WY · ~2,620 served 67 3 CHEYENNE BOARD OF PUBLIC UTILITIES CHEYENNE, WY · ~64,165 served 100 4 CASPER, CITY OF CASPER, WY · ~59,000 served 100 5 LARAMIE, CITY OF LARAMIE, WY · ~32,395 served 100 6 GILLETTE, CITY OF GILLETTE, WY · ~32,222 served 100 7 JACKSON, TOWN OF JACKSON, WY · ~24,760 served 100 8 ROCK SPRINGS, CITY OF ROCK SPRINGS, WY · ~24,000 served 100 9 SHERIDAN, CITY OF SHERIDAN, WY · ~22,700 served 100 10 EVANSTON, CITY OF EVANSTON, WY · ~12,000 served 100 11 GREEN RIVER, CITY OF GREEN RIVER, WY · ~10,500 served 100 12 CODY, CITY OF CODY, WY · ~10,224 served 100 13 SOUTH CHEYENNE WATER & SEWER DISTRICT CHEYENNE, WY · ~10,000 served 100 14 RAWLINS WATER SUPPLY, CITY OF RAWLINS, WY · ~9,006 served 100 15 YNP-OLD FAITHFUL YELLOWSTONE, WY · ~7,675 served 100 16 LANDER, CITY OF LANDER, WY · ~7,615 served 100 17 NORTHWEST RURAL WATER DISTRICT CODY, WY · ~7,330 served 100 18 TORRINGTON MUNICIPAL WATER DEPT, CITY OF TORRINGTON, WY · ~6,847 served 100 19 DOUGLAS, CITY OF DOUGLAS, WY · ~6,400 served 100 20 POWELL, CITY OF POWELL, WY · ~6,310 served 100 21 YNP - LAKE VILLAGE YELLOWSTONE, WY · ~5,925 served 100 22 USAF F.E. WARREN AFB F.E. WARREN AFB, WY · ~5,500 served 100 23 WORLAND UTILITIES COMMISSION WORLAND, WY · ~5,487 served 100 24 GTNP-COLTER BAY VILLAGE MOOSE, WY · ~4,514 served 100 25 BUFFALO, CITY OF BUFFALO, WY · ~4,419 served 100
Highest-scoring large systems in Wyoming
Systems serving 10,000+ people with the best scores.
1 CHEYENNE BOARD OF PUBLIC UTILITIES CHEYENNE, WY · ~64,165 served 100 2 CASPER, CITY OF CASPER, WY · ~59,000 served 100 3 LARAMIE, CITY OF LARAMIE, WY · ~32,395 served 100 4 GILLETTE, CITY OF GILLETTE, WY · ~32,222 served 100 5 JACKSON, TOWN OF JACKSON, WY · ~24,760 served 100 6 ROCK SPRINGS, CITY OF ROCK SPRINGS, WY · ~24,000 served 100 7 SHERIDAN, CITY OF SHERIDAN, WY · ~22,700 served 100 8 EVANSTON, CITY OF EVANSTON, WY · ~12,000 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.