Idaho public water systems
1,950 active systems regulated under the Safe Drinking Water Act, serving a reported 1.8M people across 64 counties.
Dataset updated . Source: EPA SDWIS/ECHO, refreshed quarterly.
Active systems
1,950
Population served
1.8M
Community systems
767
Groundwater share
95.9%
System types in Idaho
767
Community water system
239
Non-transient non-community water system
944
Transient non-community water system
Largest water systems in Idaho
| # | Water system | County | Population served | Type | Source |
|---|---|---|---|---|---|
| 1 | Veolia Water Idaho | Ada | 264,978 | Community | Surface water |
| 2 | Meridian Water Dept | Ada | 147,340 | Community | Groundwater |
| 3 | Nampa City of | Canyon | 100,200 | Community | Groundwater |
| 4 | Caldwell City of | Canyon | 74,000 | Community | Groundwater |
| 5 | Idaho Falls City of | Bonneville | 69,450 | Community | Groundwater |
| 6 | Pocatello City of | Bannock | 58,231 | Community | Groundwater |
| 7 | Twin Falls City of | Twin Falls | 56,121 | Community | Groundwater |
| 8 | Coeur D Alene City of | Kootenai | 54,115 | Community | Groundwater |
| 9 | Rexburg City of | Madison | 39,790 | Community | Groundwater |
| 10 | Kuna City of | Ada | 32,038 | Community | Groundwater |
| 11 | Moscow Water Dept | Latah | 26,000 | Community | Groundwater |
| 12 | Falls Water Company Inc. | Bonneville | 22,650 | Community | Groundwater |
| 13 | Post Falls City of | Kootenai | 20,285 | Community | Groundwater |
| 14 | Lewiston Orchards Irrigation Dist | Nez Perce | 20,000 | Community | Groundwater |
| 15 | Ammon City of | Bonneville | 17,338 | Community | Groundwater |
| 16 | Chubbuck City of | Bannock | 15,842 | Community | Groundwater |
| 17 | Lewiston City of | Nez Perce | 15,001 | Community | Surface water |
| 18 | Mountain Home, City of | Elmore | 14,651 | Community | Groundwater |
| 19 | Star Sewer and Water Dist Water System | Ada | 14,000 | Community | Groundwater |
| 20 | Blackfoot City of | Bingham | 13,224 | Community | Groundwater |
| 21 | Middleton City of | Canyon | 13,190 | Community | Groundwater |
| 22 | Jerome City of | Jerome | 13,135 | Community | Groundwater |
| 23 | Garden City Water and Sewer System | Ada | 12,500 | Community | Groundwater |
| 24 | Sandpoint Public Works Dept | Bonner | 12,284 | Community | Surface water |
| 25 | East Greenacres Irrigation Dist | Kootenai | 11,165 | Community | Groundwater |
By county
Kootenai183 systemsBonner143 systemsCanyon141 systemsBonneville121 systemsAda88 systemsFremont87 systemsJefferson61 systemsBingham60 systemsCuster58 systemsValley56 systemsIdaho55 systemsBoise55 systemsTwin Falls53 systemsCassia49 systemsBannock45 systemsBlaine43 systemsElmore43 systemsLemhi42 systemsShoshone37 systemsGem33 systemsMadison32 systemsLatah29 systemsMinidoka27 systemsTeton27 systemsGooding26 systemsClearwater26 systemsNez Perce25 systemsBear Lake24 systemsOwyhee24 systemsJerome24 systemsFranklin21 systemsPayette20 systemsBoundary18 systemsAdams16 systemsPower16 systemsCaribou15 systemsButte15 systemsBenewah15 systemsWashington14 systemsOneida10 systemsCamas9 systemsClark8 systemsLincoln6 systemsLewis6 systemsMesa4 systemsBox Elder3 systems
King2 systems
Lubbock2 systems
Union2 systems
Cache2 systems
Jackson2 systems
Grady1 systems
Grant1 systems
Linn1 systems
Malheur1 systems
Island1 systems
Spokane1 systems
Clallam1 systems
Boone1 systems
Rich1 systems
Josephine1 systems
Garfield1 systems
Tuolumne1 systems
Whitman1 systems