| Public water system | Population served |
|---|---|
| NAMPA CITY OF | 100,200 |
| CALDWELL CITY OF | 74,000 |
| IDAHO FALLS CITY OF | 69,450 |
| POCATELLO CITY OF | 58,231 |
| TWIN FALLS CITY OF | 56,121 |
| COEUR D ALENE CITY OF | 54,115 |
| REXBURG CITY OF | 40,695 |
| KUNA CITY OF | 32,038 |
| MOSCOW WATER DEPT | 26,000 |
| POST FALLS CITY OF | 20,285 |
| AMMON CITY OF | 17,338 |
| CHUBBUCK CITY OF | 15,842 |
| LEWISTON CITY OF | 15,001 |
| MOUNTAIN HOME, CITY OF | 14,651 |
| BLACKFOOT CITY OF | 13,224 |
| MIDDLETON CITY OF | 13,190 |
| JEROME CITY OF | 13,135 |
| GARDEN CITY WATER AND SEWER SYSTEM | 12,500 |
| SANDPOINT PUBLIC WORKS DEPT | 12,284 |
| RATHDRUM CITY OF | 10,358 |
| AVONDALE IRRIGATION DIST | 8,785 |
| UNIVERSITY OF IDAHO | 8,589 |
| PAYETTE CITY OF | 8,127 |
| MOUNTAIN HOME AIR FORCE BASE | 7,500 |
| FRUITLAND CITY OF | 7,458 |
| EMMETT CITY OF | 6,700 |
| EAGLE, CITY OF (WESTERN ZONE) | 6,108 |
| CENTRAL SHOSHONE COUNTY WATER DIST | 6,098 |
| RUPERT CITY OF | 5,796 |
| WEISER CITY OF | 5,630 |
| PRESTON CITY OF | 5,591 |
| RIGBY CITY OF | 5,400 |
| KIMBERLY CITY OF | 5,359 |
| AMERICAN FALLS CITY OF | 4,863 |
| BUHL CITY OF | 4,518 |
| MCCALL CITY OF | 4,423 |
| SHELLEY CITY OF | 4,409 |
| ST MARIES CITY OF | 4,173 |
| GOODING CITY OF | 3,706 |
| EAGLE, CITY OF (EASTERN ZONE) | 3,702 |
| ST ANTHONY | 3,606 |
| KETCHUM CITY OF | 3,555 |
| BONNERS FERRY CITY OF | 3,367 |
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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