State drinking water records
Idaho drinking water systems
777 community water systems serve Idaho and are listed below under 44 counties and on the pages of 208 cities and towns. Their own population figures add up to 1,572,203 people, a sum that counts people twice where one system sells water to another.
257 of them (33%) had at least one health-based violation in the last 10 years. 344 systems still have one unresolved.
709 rely mainly on groundwater and 68 on surface water, counting water bought from other systems.
768 systems filed a lead service line inventory listing 633 lead lines, 2,140 galvanized lines that must be replaced and 97,465 lines of unknown material.
186 systems are placed by the county their records name: EPA has no service area map for 179 of them, and 7 have one that does not line up with their own records.
- Community water systems
- 777
- People served, sum of each system's own figure
- 1,572,203
- Systems with a health-based violation, last 10 years
- 257
- Systems with one unresolved
- 344
- Lead service lines in inventories
- 633
Counties
44 countiesEach county counts the systems whose service area map reaches it. Systems placed only by a mailing address are listed on the county pages but not counted here.
| County | Systems | People served | With a health-based violation, 10 years | With one unresolved |
|---|---|---|---|---|
| Ada County | 37 | 498,688 | 10 | 13 |
| Adams County | 4 | 2,378 | 0 | 0 |
| Bannock County | 17 | 78,273 | 5 | 9 |
| Bear Lake County | 11 | 5,394 | 3 | 8 |
| Benewah County | 11 | 6,911 | 6 | 2 |
| Bingham County | 25 | 26,170 | 10 | 15 |
| Blaine County | 17 | 20,725 | 7 | 7 |
| Boise County | 15 | 3,634 | 8 | 9 |
| Bonner County | 31 | 25,690 | 6 | 7 |
| Bonneville County | 27 | 118,476 | 10 | 6 |
| Boundary County | 10 | 10,464 | 6 | 2 |
| Butte County | 3 | 1,335 | 1 | 0 |
| Camas County | 1 | 441 | 1 | 1 |
| Canyon County | 63 | 201,780 | 14 | 41 |
| Caribou County | 7 | 4,848 | 3 | 4 |
| Cassia County | 11 | 12,758 | 7 | 7 |
| Clark County | 1 | 511 | 1 | 1 |
| Clearwater County | 8 | 5,754 | 6 | 5 |
| Custer County | 3 | 1,591 | 0 | 0 |
| Elmore County | 18 | 25,093 | 11 | 12 |
| Franklin County | 12 | 10,277 | 8 | 8 |
| Fremont County | 7 | 6,400 | 3 | 2 |
| Gem County | 5 | 6,872 | 1 | 3 |
| Gooding County | 7 | 8,239 | 1 | 3 |
| Idaho County | 15 | 7,064 | 7 | 4 |
| Jefferson County | 17 | 9,389 | 7 | 10 |
| Jerome County | 6 | 15,082 | 2 | 5 |
| Kootenai County | 84 | 160,493 | 14 | 31 |
| Latah County | 19 | 40,204 | 8 | 5 |
| Lemhi County | 5 | 3,535 | 3 | 3 |
| Lewis County | 6 | 2,976 | 2 | 3 |
| Lincoln County | 4 | 2,286 | 2 | 3 |
| Madison County | 4 | 42,785 | 1 | 0 |
| Minidoka County | 8 | 10,543 | 4 | 5 |
| Nez Perce County | 13 | 37,616 | 5 | 5 |
| Oneida County | 1 | 2,200 | 0 | 0 |
| Owyhee County | 6 | 5,099 | 2 | 3 |
| Payette County | 4 | 16,932 | 1 | 3 |
| Power County | 5 | 5,557 | 2 | 2 |
| Shoshone County | 11 | 13,050 | 1 | 1 |
| Teton County | 9 | 6,551 | 1 | 2 |
| Twin Falls County | 12 | 71,166 | 6 | 7 |
| Valley County | 9 | 7,098 | 5 | 6 |
| Washington County | 3 | 6,109 | 0 | 1 |
Largest systems
| System | Main county | People served | Main source | Health-based violations, 10 years | Unresolved | Lead lines |
|---|---|---|---|---|---|---|
| Veolia Water Idaho | Ada County | 264,978 | Surface water | 0 | 0 | 0 |
| Meridian Water Dept | Ada County | 147,340 | Groundwater | 0 | 0 | 0 |
| City of Nampa | Canyon County | 100,200 | Groundwater | 0 | 0 | 0 |
| City of Caldwell | Canyon County | 74,000 | Groundwater | 0 | 1 | 50 |
| City of Idaho Falls | Bonneville County | 69,450 | Groundwater | 0 | 0 | 0 |
| City of Pocatello | Bannock County | 58,231 | Groundwater | 1 | 0 | 0 |
| City of Twin Falls | Twin Falls County | 56,121 | Groundwater | 0 | 0 | 0 |
| City of Coeur D Alene | Kootenai County | 54,115 | Groundwater | 0 | 0 | 0 |
| City of Rexburg | Madison County | 39,790 | Groundwater | 1 | 0 | 0 |
| City of Kuna | Ada County | 32,038 | Groundwater | 0 | 0 | 0 |
| Moscow Water Dept | Latah County | 26,000 | Groundwater | 0 | 0 | 0 |
| Falls Water Company Inc | Bonneville County | 22,650 | Groundwater | 1 | 0 | 0 |
| City of Post Falls | Kootenai County | 20,285 | Groundwater | 1 | 0 | 0 |
| Lewiston Orchards Irrigation Dist | Nez Perce County | 20,000 | Groundwater | 0 | 0 | 0 |
| City of Ammon | Bonneville County | 17,338 | Groundwater | 0 | 0 | 0 |
Systems with unresolved health-based violations
344 systemsThe 100 with the most unresolved violations are listed. The county pages list the other 244.
| System | Main county | People served | Main source | Health-based violations, 10 years | Unresolved | Lead lines |
|---|---|---|---|---|---|---|
| Terrace Lakes Water Company | Boise County | 475 | Groundwater | 4 | 43 | 0 |
| Banida Water and Sewer Dist | Franklin County | 180 | Groundwater | 9 | 27 | 0 |
| Apache Heights Subdivision (2) | Canyon County | 110 | Groundwater | 0 | 22 | 0 |
| Shady Rest RV Park and Campground | Bonneville County | 80 | Groundwater | 14 | 16 | 0 |
| King Hill Domestic Water and Sewer | Elmore County | 87 | Groundwater | 13 | 12 | 0 |
| Cedar Springs Community Water | Bonner County | 130 | Groundwater | 22 | 11 | 0 |
| Purple Sage Community | Canyon County | 98 | Groundwater | 1 | 11 | 0 |
| Mountain View Court | Fremont County | 40 | Groundwater | 5 | 11 | 0 |
| Riverside Trailer Court | Cassia County | 35 | Groundwater | 1 | 11 | 0 |
| City of Lewiston | Nez Perce County | 15,001 | Surface water | 0 | 9 | 0 |
| Lodge Haven Water Company | Bonner County | 37 | Groundwater | 10 | 9 | 0 |
| Mountain View Water and Road Assn | Boise County | 305 | Groundwater | 4 | 8 | 0 |
| Mountain View RV West | Valley County | 75 | Groundwater | 7 | 7 | 0 |
| City of Reubens | Lewis County | 70 | Groundwater | 7 | 7 | 0 |
| Red Pheasant Water Company LLC | Nez Perce County | 480 | Groundwater | 1 | 6 | 0 |
| Unit 3 Water Assn | Jerome County | 350 | Groundwater | 2 | 6 | 0 |
| Preston Eastside Water Co | Franklin County | 120 | Groundwater | 2 | 6 | 0 |
| Stepping Stones Estates | Kootenai County | 88 | Groundwater | 0 | 6 | 0 |
| Rigby Air Village LLC | Jefferson County | 80 | Groundwater | 1 | 6 | 0 |
| Stanley Pond Inc | Ada County | 72 | Groundwater | 0 | 6 | 0 |
| Cedar Point Subdivision | Bingham County | 63 | Groundwater | 3 | 6 | 0 |
| Sunset Mobile Home Park | Lincoln County | 55 | Groundwater | 6 | 6 | 0 |
| Clear Lake Ranch P U D | Gooding County | 54 | Groundwater | 3 | 6 | 0 |
| Sunnyridge Property Owners | Canyon County | 53 | Groundwater | 0 | 6 | 0 |
| Hillview Subd | Madison County | 50 | Groundwater | 2 | 6 | 0 |
| Sunnyside Park | Clearwater County | 40 | Groundwater | 2 | 6 | 0 |
| City of Oakley | Cassia County | 821 | Groundwater | 2 | 5 | 0 |
| City of Worley | Kootenai County | 591 | Groundwater | 5 | 5 | 0 |
| Meadows at West Mountain | Valley County | 550 | Groundwater | 4 | 5 | 0 |
| Morning View Water Company | Jefferson County | 459 | Groundwater | 0 | 5 | 0 |
| Apex Living Community | Latah County | 150 | Groundwater | 4 | 5 | 0 |
| Pelican Point Subdivision | Minidoka County | 142 | Groundwater | 3 | 5 | 0 |
| View Water Development Company | Cassia County | 112 | Groundwater | 4 | 5 | 0 |
| Savory Community LLC | Kootenai County | 100 | Groundwater | 0 | 5 | 0 |
| Kimpton Acres Third Subd | Canyon County | 88 | Groundwater | 0 | 5 | 0 |
| Ahsahka Water and Sewer Dist | Clearwater County | 85 | Surface water | 2 | 5 | 0 |
| Sunbeam Water | Power County | 60 | Groundwater | 9 | 5 | 0 |
| Riverview Acres 2 | Bingham County | 29 | Groundwater | 1 | 5 | 0 |
| Kootenai County Water Dist 1 | Kootenai County | 843 | Surface water | 2 | 4 | 0 |
| City of Fairfield | Camas County | 441 | Groundwater | 4 | 4 | 0 |
| Mission Creek Water Assn | Boundary County | 263 | Groundwater | 78 | 4 | 0 |
| Bennington Water System | Bear Lake County | 250 | Groundwater | 1 | 4 | 0 |
| Idle Wheels MHP Cat LLC | Bingham County | 85 | Groundwater | 0 | 4 | 0 |
| Moreland Country Court | Bingham County | 60 | Groundwater | 2 | 4 | 0 |
| Smith Road Water Users Assn | Bannock County | 58 | Groundwater | 3 | 4 | 0 |
| Darby Water Assn | Teton County | 58 | Groundwater | 3 | 4 | 0 |
| Silver Sage Real Property Owners Assn | Elmore County | 30 | Groundwater | 4 | 4 | 0 |
| City of Mountain Home | Elmore County | 14,651 | Groundwater | 3 | 3 | 0 |
| Idoc SBX Complex | Ada County | 3,309 | Groundwater | 0 | 3 | 0 |
| Three Mile Water Dist | Boundary County | 2,458 | Groundwater | 0 | 3 | 0 |
| City of Hansen | Twin Falls County | 1,200 | Groundwater | 1 | 3 | 0 |
| Oakley Valley Water Corporation | Cassia County | 500 | Groundwater | 19 | 3 | 0 |
| Idaho City Water Dept | Boise County | 478 | Surface water | 10 | 3 | 0 |
| Dietrich Water System | Lincoln County | 332 | Groundwater | 1 | 3 | 0 |
| City of Parker | Fremont County | 322 | Groundwater | 2 | 3 | 0 |
| Evergreen Mobile Park | Canyon County | 284 | Groundwater | 2 | 3 | 0 |
| Indian Village | Canyon County | 225 | Groundwater | 10 | 3 | 0 |
| Drake Subd | Canyon County | 150 | Groundwater | 24 | 3 | 0 |
| Birch Creek Culinary | Franklin County | 120 | Groundwater | 1 | 3 | 0 |
| Smiley Creek Water Users Assn Inc | Blaine County | 117 | Groundwater | 3 | 3 | 0 |
| Pleasant View Manor | Canyon County | 100 | Groundwater | 1 | 3 | 0 |
| Heyburn Estates | Minidoka County | 100 | Groundwater | 1 | 3 | 0 |
| Roswell Water Users Coop Company | Canyon County | 90 | Groundwater | 0 | 3 | 0 |
| Riverside Estates | Bingham County | 90 | Groundwater | 2 | 3 | 0 |
| Pleasant Acres Mobile Home Park | Elmore County | 85 | Groundwater | 2 | 3 | 0 |
| New Horizons Water Inc | Elmore County | 85 | Groundwater | 1 | 3 | 0 |
| Sienna Ridge Estates | Kootenai County | 81 | Groundwater | 1 | 3 | 0 |
| Hope House (Owyhee) | Owyhee County | 78 | Groundwater | 4 | 3 | 0 |
| Bittercreek Meadows Subdivision | Ada County | 75 | Groundwater | 5 | 3 | 0 |
| Strawberry Mink Creek Water Assn | Franklin County | 75 | Groundwater under direct influence | 2 | 3 | 0 |
| Yellow Pine Water Users Inc | Valley County | 72 | Surface water | 2 | 3 | 0 |
| Loma Linda Water Corp | Payette County | 70 | Groundwater | 0 | 3 | 0 |
| Spring Creek Terraces | Cassia County | 70 | Groundwater | 3 | 3 | 0 |
| Mountain Sage | Elmore County | 65 | Groundwater | 2 | 3 | 0 |
| Rich Subd | Canyon County | 60 | Groundwater | 1 | 3 | 0 |
| Gannett Homeowners Assn | Blaine County | 60 | Groundwater | 3 | 3 | 0 |
| Dahl Subd | Canyon County | 51 | Groundwater | 0 | 3 | 0 |
| Wayside Estates | Minidoka County | 50 | Groundwater | 17 | 3 | 0 |
| Riverstone Subdivision | Bingham County | 50 | Groundwater | 1 | 3 | 0 |
| Holiday Highway Subd | Blaine County | 45 | Groundwater | 1 | 3 | 0 |
| Locust Subd | Canyon County | 42 | Groundwater | 2 | 3 | 0 |
| Lazy River Mobile Home Park 1 | Payette County | 41 | Groundwater | 6 | 3 | 0 |
| Scenic Properties Water Assn Inc | Boise County | 40 | Groundwater | 0 | 3 | 0 |
| Springdale Acres | Cassia County | 35 | Groundwater | 0 | 3 | 0 |
| Moose Mountain | Bannock County | 27 | Groundwater | 0 | 3 | 0 |
| Goose Creek Rentals | Adams County | 26 | Groundwater | 3 | 3 | 0 |
| Rest Ez RV Park | Gooding County | 25 | Groundwater | 1 | 3 | No inventory |
| City of Bellevue | Blaine County | 2,747 | Groundwater | 22 | 2 | 0 |
| Idoc Idaho State Correctional Center | Ada County | 2,204 | Groundwater | 0 | 2 | 0 |
| City of Driggs | Teton County | 2,200 | Groundwater | 0 | 2 | 1 |
| Hauser Lake Water Assn Inc | Kootenai County | 1,575 | Groundwater | 0 | 2 | 0 |
| City of Roberts | Jefferson County | 680 | Groundwater | 0 | 2 | 0 |
| City of Juliaetta | Latah County | 624 | Surface water | 21 | 2 | 0 |
| Rustic Acres Mobile Home Park | Ada County | 540 | Groundwater | 0 | 2 | 0 |
| City of Paris | Bear Lake County | 535 | Groundwater | 0 | 2 | 0 |
| City of Harrison | Kootenai County | 456 | Groundwater | 1 | 2 | 0 |
| Idoc Mountain View Transformation Center | Ada County | 456 | Groundwater | 1 | 2 | 0 |
| City of Grand View | Owyhee County | 452 | Groundwater | 1 | 2 | 0 |
| Gem State - Bitterroot Water Company | Kootenai County | 428 | Groundwater | 0 | 2 | 0 |
| City of Clifton | Franklin County | 413 | Groundwater | 2 | 2 | 0 |
Counties come from the counties EPA lists each system serving, matched to 2024 Census counties; where EPA lists none, from the county coded in the system's ID, its service area map, or its mailing address. A county holding at least a fifth of a system's service area map is added when at least a fifth of that map lies in those counties. Towns are the ones EPA lists and the Census places such a map covers, always inside those counties. In New England, where EPA's town names a whole Town, it is not matched to the village of the same name. A system is not listed in a county holding less than a fifth of its map, or in a county or town its map reaches when the map lies mostly outside the counties EPA lists, so a page can leave out a system that serves part of the area. Methodology and limitations