State drinking water records
Washington drinking water systems
2,377 community water systems serve Washington and are listed below under 39 counties and on the pages of 594 cities and towns. Their own population figures add up to 9,469,178 people, a sum that counts people twice where one system sells water to another.
254 of them (11%) had at least one health-based violation in the last 10 years. 172 systems still have one unresolved.
2,169 rely mainly on groundwater and 206 on surface water, counting water bought from other systems.
1,619 systems filed a lead service line inventory listing 1,313 lead lines, 5,980 galvanized lines that must be replaced and 203,340 lines of unknown material.
262 systems are placed by the county their records name: EPA has no service area map for 206 of them, and 56 have one that does not line up with their own records.
- Community water systems
- 2,377
- People served, sum of each system's own figure
- 9,469,178
- Systems with a health-based violation, last 10 years
- 254
- Systems with one unresolved
- 172
- Lead service lines in inventories
- 1,313
Counties
39 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 |
|---|---|---|---|---|
| Adams County | 23 | 14,745 | 0 | 4 |
| Asotin County | 2 | 24,461 | 0 | 0 |
| Benton County | 30 | 266,995 | 6 | 1 |
| Chelan County | 44 | 105,973 | 4 | 3 |
| Clallam County | 68 | 84,038 | 6 | 3 |
| Clark County | 17 | 636,652 | 1 | 2 |
| Columbia County | 2 | 3,521 | 0 | 0 |
| Cowlitz County | 24 | 106,495 | 1 | 1 |
| Douglas County | 22 | 55,265 | 3 | 1 |
| Ferry County | 8 | 3,457 | 2 | 1 |
| Franklin County | 27 | 125,680 | 3 | 4 |
| Garfield County | 1 | 1,395 | 0 | 0 |
| Grant County | 64 | 88,732 | 10 | 2 |
| Grays Harbor County | 36 | 84,225 | 6 | 3 |
| Island County | 223 | 91,539 | 40 | 41 |
| Jefferson County | 24 | 40,194 | 1 | 2 |
| King County | 119 | 3,225,027 | 6 | 9 |
| Kitsap County | 115 | 329,088 | 8 | 5 |
| Kittitas County | 27 | 35,298 | 1 | 2 |
| Klickitat County | 19 | 16,370 | 2 | 2 |
| Lewis County | 51 | 65,846 | 6 | 0 |
| Lincoln County | 16 | 8,960 | 1 | 1 |
| Mason County | 115 | 56,699 | 6 | 3 |
| Okanogan County | 40 | 28,268 | 2 | 2 |
| Pacific County | 17 | 32,139 | 4 | 0 |
| Pend Oreille County | 16 | 9,597 | 5 | 1 |
| Pierce County | 226 | 1,095,610 | 13 | 7 |
| San Juan County | 40 | 14,883 | 7 | 2 |
| Skagit County | 44 | 153,670 | 3 | 8 |
| Skamania County | 12 | 8,841 | 1 | 0 |
| Snohomish County | 119 | 1,016,704 | 5 | 11 |
| Spokane County | 83 | 605,331 | 5 | 5 |
| Stevens County | 27 | 28,861 | 5 | 6 |
| Thurston County | 196 | 370,498 | 17 | 5 |
| Wahkiakum County | 4 | 3,606 | 0 | 0 |
| Walla Walla County | 33 | 66,043 | 5 | 2 |
| Whatcom County | 103 | 249,001 | 19 | 5 |
| Whitman County | 19 | 64,679 | 0 | 2 |
| Yakima County | 73 | 249,451 | 10 | 6 |
Largest systems
| System | Main county | People served | Main source | Health-based violations, 10 years | Unresolved | Lead lines |
|---|---|---|---|---|---|---|
| Seattle Public Utilities | King County | 1,161,961 | Surface water | 0 | 0 | 0 |
| City of Tacoma Water Division | Pierce County | 446,170 | Surface water | 0 | 0 | 0 |
| City of Vancouver | Clark County | 373,047 | Groundwater | 0 | 0 | 0 |
| City of Spokane | Spokane County | 343,167 | Groundwater | 0 | 0 | 0 |
| City of Bellevue | King County | 321,349 | Purchased surface water | 0 | 0 | 0 |
| Alderwood Water District | Snohomish County | 245,715 | Purchased surface water | 0 | 0 | 0 |
| City of Everett Public Works Dept. | Snohomish County | 215,774 | Surface water | 0 | 0 | 0 |
| Kent Water Department | King County | 166,421 | Purchased surface water | 0 | 0 | 0 |
| City of Redmond Water System | King County | 163,335 | Purchased surface water | 0 | 0 | 0 |
| Clark Public Utilities | Clark County | 153,526 | Groundwater | 0 | 0 | No inventory |
| Lakehaven Water and Sewer District | King County | 148,809 | Purchased surface water | 0 | 0 | 0 |
| City of Bellingham-Water Division | Whatcom County | 141,127 | Surface water | 0 | 0 | 0 |
| City of Olympia | Thurston County | 126,966 | Groundwater | 0 | 0 | 0 |
| City of Kennewick | Benton County | 118,164 | Surface water | 0 | 0 | 0 |
| Pasco Water Department | Franklin County | 115,102 | Surface water | 0 | 0 | 0 |
Systems with unresolved health-based violations
172 systemsThe 100 with the most unresolved violations are listed. The county pages list the other 72.
| System | Main county | People served | Main source | Health-based violations, 10 years | Unresolved | Lead lines |
|---|---|---|---|---|---|---|
| Fort Simcoe Job Corps Ctr | Yakima County | 230 | Groundwater | 8 | 8 | 0 |
| Trails West Subdivision | Stevens County | 27 | Groundwater | 0 | 8 | No inventory |
| Queets | Grays Harbor County | 200 | Groundwater | 10 | 7 | 0 |
| Lummi Tribal Water District | Whatcom County | 3,699 | Purchased surface water | 1 | 5 | 0 |
| Taholah | Grays Harbor County | 1,600 | Groundwater | 4 | 5 | 0 |
| McCoy Lake | Spokane County | 325 | Groundwater | 7 | 5 | 0 |
| Holden Village | Chelan County | 228 | Surface water | 4 | 4 | No inventory |
| Reservation Road | Spokane County | 110 | Groundwater | 7 | 4 | 0 |
| Sauk-Suiattle | Skagit County | 80 | Groundwater | 2 | 4 | 0 |
| B & D Mobile Court | Yakima County | 45 | Groundwater | 3 | 4 | 0 |
| City of White Salmon | Klickitat County | 4,077 | Surface water | 4 | 3 | 0 |
| Wellpinit | Stevens County | 525 | Groundwater | 4 | 3 | 0 |
| Two Rivers Resort | Spokane County | 480 | Groundwater | 11 | 3 | 0 |
| Upper Skagit | Skagit County | 365 | Groundwater | 0 | 3 | 0 |
| Orient Water Company | Ferry County | 167 | Surface water | 60 | 3 | 0 |
| Hoh Tribe | Jefferson County | 120 | Groundwater | 4 | 3 | 0 |
| Haynes Acres Division 1 | Thurston County | 74 | Groundwater | 0 | 3 | No inventory |
| City of Sunnyside | Yakima County | 17,194 | Groundwater | 0 | 2 | 0 |
| White Swan | Yakima County | 900 | Groundwater | 7 | 2 | 0 |
| Sandy Hook Yacht Club Estates | Island County | 540 | Groundwater | 0 | 2 | No inventory |
| Combined Water System | Island County | 435 | Groundwater | 0 | 2 | 0 |
| Town of Riverside | Okanogan County | 429 | Groundwater | 0 | 2 | No inventory |
| Fordyce Water Assn | Klickitat County | 300 | Groundwater | 0 | 2 | No inventory |
| Mariners Cove Beach Club Inc | Island County | 300 | Groundwater | 0 | 2 | 0 |
| Qui Nai Elt Village | Grays Harbor County | 207 | Groundwater | 2 | 2 | 0 |
| Metaline Water Dept | Pend Oreille County | 193 | Surface water | 2 | 2 | No inventory |
| Sun Harbor Water District #3 | Walla Walla County | 187 | Groundwater | 0 | 2 | No inventory |
| Marlin Hutterian | Grant County | 134 | Groundwater | 0 | 2 | No inventory |
| Marble Water System | Stevens County | 94 | Groundwater | 1 | 2 | No inventory |
| Parkwood | Island County | 65 | Groundwater | 3 | 2 | 0 |
| Parkwood Apartments | Thurston County | 60 | Groundwater | 2 | 2 | No inventory |
| Syringa Heights Mobile Home Park | Spokane County | 52 | Groundwater | 0 | 2 | No inventory |
| Briarwood Water System | Island County | 44 | Groundwater | 3 | 2 | No inventory |
| Wildes Grove Community Water Sys | Island County | 33 | Groundwater | 0 | 2 | No inventory |
| Tiger Mtn Tracts | King County | 30 | Groundwater | 0 | 2 | No inventory |
| Ocosta Mobile Home Park LLC | Grays Harbor County | 26 | Groundwater | 0 | 2 | No inventory |
| Twin Pines Mobile Home Park | Okanogan County | 25 | Groundwater | 0 | 2 | No inventory |
| Camas Municipal Water Sewer System | Clark County | 31,794 | Groundwater | 0 | 1 | 0 |
| Vera Water & Power | Spokane County | 24,692 | Groundwater | 0 | 1 | 0 |
| City of Poulsbo | Kitsap County | 18,400 | Groundwater | 0 | 1 | 0 |
| Quimper | Jefferson County | 14,548 | Groundwater | 0 | 1 | 0 |
| City of Dupont Water System | Pierce County | 13,141 | Groundwater | 0 | 1 | 0 |
| Snoqualmie Pass Utility District | King County | 5,805 | Groundwater | 0 | 1 | 0 |
| Point Evans | Pierce County | 5,211 | Groundwater | 0 | 1 | 0 |
| City of Connell | Franklin County | 5,150 | Groundwater | 0 | 1 | No inventory |
| Town of Naches | Yakima County | 3,512 | Groundwater | 0 | 1 | No inventory |
| Rainier Water Department | Thurston County | 2,758 | Groundwater | 0 | 1 | 0 |
| Glacier Water District | Whatcom County | 2,383 | Groundwater | 0 | 1 | 0 |
| Timberlake Community Club Inc | Mason County | 2,337 | Groundwater | 0 | 1 | 0 |
| Alpine Water District | Chelan County | 2,255 | Groundwater | 0 | 1 | 0 |
| Town of Darrington | Snohomish County | 2,246 | Groundwater | 0 | 1 | No inventory |
| Cle Elum Water Department | Kittitas County | 2,213 | Surface water | 1 | 1 | 0 |
| Shelter Bay Community Inc | Skagit County | 2,212 | Purchased surface water | 0 | 1 | 0 |
| Skagit Co Water District #1 | Skagit County | 1,974 | Groundwater | 0 | 1 | No inventory |
| Summit View Water System | Benton County | 1,869 | Groundwater | 0 | 1 | 0 |
| Port Susan Camp Club #1 | Snohomish County | 1,500 | Groundwater | 0 | 1 | 0 |
| Tapps Island Water System | Pierce County | 1,500 | Groundwater | 0 | 1 | 0 |
| Point Roberts Water District No 4 | Whatcom County | 1,440 | Groundwater | 0 | 1 | 0 |
| Harbor Hills Community Water System | Island County | 1,373 | Groundwater | 0 | 1 | No inventory |
| Shorecrest Estates Water Co | Mason County | 1,321 | Groundwater | 0 | 1 | No inventory |
| Monse-Riggan Camp | Okanogan County | 1,165 | Groundwater | 1 | 1 | No inventory |
| Bayview Beach Water District | Island County | 1,035 | Groundwater | 0 | 1 | No inventory |
| Port Susan Camp Club #3 | Snohomish County | 1,000 | Groundwater | 2 | 1 | 0 |
| Burton Water Cooperative | King County | 964 | Groundwater | 0 | 1 | No inventory |
| Town of Lind | Adams County | 903 | Groundwater | 0 | 1 | 0 |
| Island Lake | Kitsap County | 883 | Groundwater | 0 | 1 | 0 |
| Adams County Water Dist #1 | Adams County | 870 | Purchased groundwater | 0 | 1 | No inventory |
| Concrete Utilities | Skagit County | 810 | Groundwater | 1 | 1 | 0 |
| Lynch Cove | Mason County | 721 | Groundwater | 0 | 1 | 0 |
| Colton Water Department | Whitman County | 632 | Groundwater | 0 | 1 | 0 |
| Priest Point Beach Water Inc | Snohomish County | 624 | Groundwater | 0 | 1 | 0 |
| Sumas Rural Water Association | Whatcom County | 612 | Purchased groundwater | 0 | 1 | No inventory |
| Albion Water Dept | Whitman County | 600 | Groundwater | 0 | 1 | 0 |
| Bucoda Water Dept | Thurston County | 579 | Groundwater | 0 | 1 | 0 |
| City of Sprague | Lincoln County | 570 | Groundwater | 0 | 1 | No inventory |
| Westside Water Assn | King County | 562 | Groundwater | 0 | 1 | No inventory |
| Dungeness Heights | Clallam County | 558 | Groundwater | 0 | 1 | 0 |
| Dugualla Community Inc | Island County | 459 | Groundwater | 0 | 1 | No inventory |
| Saratoga Beach Owners Assn | Island County | 425 | Groundwater | 0 | 1 | No inventory |
| Whidbey West Water Assoc. | Island County | 415 | Groundwater | 11 | 1 | 0 |
| Tatoosh Water Company | Snohomish County | 387 | Groundwater | 0 | 1 | 0 |
| Mansfield Water System | Douglas County | 380 | Groundwater | 0 | 1 | 0 |
| Winchester Mobile Homes Water | Pierce County | 350 | Groundwater | 0 | 1 | No inventory |
| Swantown Water District | Island County | 318 | Groundwater | 0 | 1 | No inventory |
| Hunters Water District | Stevens County | 290 | Groundwater | 0 | 1 | 0 |
| West Ridge Water System | Island County | 275 | Groundwater | 0 | 1 | No inventory |
| City of Kahlotus | Franklin County | 262 | Groundwater | 0 | 1 | 0 |
| Stevens Co PUD - Addy | Stevens County | 253 | Groundwater | 0 | 1 | 0 |
| Percie Road Water Association | Whatcom County | 250 | Groundwater | 0 | 1 | No inventory |
| Camano City Community Club Inc | Island County | 246 | Groundwater | 0 | 1 | 0 |
| Kittitas Co WD #2 | Kittitas County | 242 | Purchased surface water | 0 | 1 | 0 |
| Summerset West Water Association | Adams County | 240 | Groundwater | 0 | 1 | No inventory |
| Holiday Hideaway Water Co | Skagit County | 235 | Groundwater | 0 | 1 | 0 |
| Maury Mutual Water Co | King County | 233 | Groundwater | 0 | 1 | 0 |
| Davis Terrace Water Assn | Cowlitz County | 222 | Purchased surface water | 0 | 1 | 0 |
| Green Bluff Water Assn | Spokane County | 218 | Purchased groundwater | 0 | 1 | 0 |
| Polnell Shores Comm Org Inc | Island County | 195 | Groundwater | 0 | 1 | 0 |
| Harris Custer Estates Water Assn | Island County | 194 | Groundwater | 1 | 1 | 0 |
| Finisterre Heights Water System | Island County | 193 | Groundwater | 0 | 1 | No inventory |
| Deception Park View | Island County | 180 | Groundwater | 0 | 1 | No inventory |
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