| Public water system | Population served |
|---|---|
| CHEYENNE BOARD OF PUBLIC UTILITIES | 64,165 |
| CASPER, CITY OF | 59,000 |
| LARAMIE, CITY OF | 32,395 |
| GILLETTE, CITY OF | 32,222 |
| JACKSON, TOWN OF | 24,760 |
| ROCK SPRINGS, CITY OF | 24,000 |
| SHERIDAN, CITY OF | 22,700 |
| EVANSTON, CITY OF | 11,727 |
| GREEN RIVER, CITY OF | 10,500 |
| RIVERTON, CITY OF | 10,330 |
| CODY, CITY OF | 10,224 |
| SOUTH CHEYENNE WATER & SEWER DISTRICT | 10,000 |
| RAWLINS WATER SUPPLY, CITY OF | 9,006 |
| YNP-OLD FAITHFUL | 7,675 |
| LANDER, CITY OF | 7,615 |
| TORRINGTON MUNICIPAL WATER DEPT, CITY OF | 6,847 |
| DOUGLAS, CITY OF | 6,400 |
| POWELL, CITY OF | 6,310 |
| YNP - LAKE VILLAGE | 5,925 |
| USAF F.E. WARREN AFB | 5,500 |
| WORLAND UTILITIES COMMISSION | 4,787 |
| GTNP-COLTER BAY VILLAGE | 4,514 |
| BUFFALO, CITY OF | 4,419 |
| MILLS, CITY OF | 4,050 |
| BAR NUNN, TOWN OF | 4,000 |
| WHEATLAND, TOWN OF | 3,659 |
| NEWCASTLE, CITY OF | 3,595 |
| KEMMERER-DIAMONDVILLE JPB | 3,348 |
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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