Washington water providers

Find published drinking-water records, providers, and official agency resources for Washington. Review sources, sample dates, and coverage.

Official drinking-water resources

• Washington State Department of Health - Office of Drinking Water
• Washington Division of Environmental Health Office of Drinking Water Sentry Internet Database

The responsible agency may differ for tribal systems. Record availability and sample dates vary by provider.

Community systems appear first. Sort: Population served · A–Z

Public water systems

4,691 systems in the imported directory. Includes community systems, schools, workplaces, and other public systems.

• Seattle Public UtilitiesWA5377050 · CWS · Population served: 1,161,961
• City of Tacoma Water DivisionWA5386800 · CWS · Population served: 446,170
• City of VancouverWA5391200 · CWS · Population served: 373,047
• City of SpokaneWA5383100 · CWS · Population served: 346,138
• City of BellevueWA5305575 · CWS · Population served: 321,349
• Alderwood Water DistrictWA5301300 · CWS · Population served: 245,715
• City of Everett Public Works Dept.WA5324050 · CWS · Population served: 215,774
• Kent Water DepartmentWA5338150 · CWS · Population served: 166,421
• City of Redmond Water SystemWA5371650 · CWS · Population served: 163,335
• Clark Public UtilitiesWA5313333 · CWS · Population served: 153,526
• Lakehaven Water And Sewer DistrictWA5341997 · CWS · Population served: 148,809
• City of Bellingham-Water DivisionWA5305600 · CWS · Population served: 141,127
• City of OlympiaWA5363450 · CWS · Population served: 126,966
• City of KennewickWA5338100 · CWS · Population served: 118,164
• Pasco Water DepartmentWA5366400 · CWS · Population served: 115,102
• City of Yakima Water DivisionWA5399150 · CWS · Population served: 112,858
• Skagit County Pud 1 Judy ResWA5379500 · CWS · Population served: 111,415
• City of RentonWA5371850 · CWS · Population served: 108,091
• City of AuburnWA5303350 · CWS · Population served: 107,655
• City of RichlandWA5372250 · CWS · Population served: 106,499
• Lacey Water DepartmentWA5343500 · CWS · Population served: 105,178
• Highline Water DistrictWA5340650 · CWS · Population served: 100,170
• Northshore Utility DistrictWA5340800 · CWS · Population served: 99,789
• City of PuyallupWA5370050 · CWS · Population served: 94,520
• Marysville UtilitiesWA5351900 · CWS · Population served: 88,582
• Lakewood Water DistrictWA5345550 · CWS · Population served: 82,425
• Sammamish Plateau Water & SewerWA5340900 · CWS · Population served: 79,362
• Soos Creek Water & Sewer DistrictWA5340100 · CWS · Population served: 74,172
• City of BremertonWA5308200 · CWS · Population served: 72,951
• City of KirklandWA5342250 · CWS · Population served: 69,243
• City of LynnwoodWA5349270 · CWS · Population served: 68,204
• Sno Pud 1 - Lake StevensWA5380907 · CWS · Population served: 67,710
• Woodinville Water DistrictWA5341600 · CWS · Population served: 66,699
• Silver Lake Water & Sewer DistrictWA5379250 · CWS · Population served: 65,033
• SouthwoodWA5382844 · CWS · Population served: 64,155
• Longview Water DepartmentWA5348100 · CWS · Population served: 57,617
• Covington Water DistrictWA5341650 · CWS · Population served: 56,172
• City of TumwaterWA5389700 · CWS · Population served: 51,802
• King County Water District #20WA5338950 · CWS · Population served: 48,469
• City of WenatcheeWA5394350 · CWS · Population served: 43,690
• Issaquah Water SystemWA5336350 · CWS · Population served: 43,584
• Bonney Lake Water Department CityWA5307650 · CWS · Population served: 43,371
• Walla Walla Water DivisionWA5392500 · CWS · Population served: 42,959
• Nob Hill Water AssociationWA5359700 · CWS · Population served: 38,050
• Tukwila Water DepartmentWA5389500 · CWS · Population served: 36,298
• Firgrove Mutual IncWA5325200 · CWS · Population served: 36,168
• JBLM LewisWA5326050 · CWS · Population served: 35,414
• Silverdale Water Dist 16WA5379300 · CWS · Population served: 35,163
• Spanaway Water CompanyWA5382850 · CWS · Population served: 34,506
• City of EdmondsWA5322500 · CWS · Population served: 34,065
• Parkland Light & Water CompanyWA5366200 · CWS · Population served: 33,775
• City of Bothell WaterWA5307900 · CWS · Population served: 33,643
• North City Water DistrictWA5339600 · CWS · Population served: 32,847
• City of Moses LakeWA5356300 · CWS · Population served: 32,428
• Camas Municipal Water Sewer SystemWA5310800 · CWS · Population served: 31,794
• Mukilteo Water & Wastewater DistrWA5357550 · CWS · Population served: 31,437
• City of Pullman Water DepartmentWA5369880 · CWS · Population served: 31,315
• City of Mercer IslandWA5353640 · CWS · Population served: 31,057
• City of Battle Ground Water DeptWA5304700 · CWS · Population served: 30,237
• City of ArlingtonWA5302950 · CWS · Population served: 29,508
• Fife Dept of Public WorksWA5325050 · CWS · Population served: 29,091
• West Sound Utility District #1WA5302600 · CWS · Population served: 28,930
• Cedar River Water & Sewer DistrictWA5341800 · CWS · Population served: 28,671
• Centralia Public Works - WaterWA5312200 · CWS · Population served: 28,164
• City of Port AngelesWA5368550 · CWS · Population served: 28,067
• Whitworth Water District 2WA5396601 · CWS · Population served: 26,883
• East Wenatchee Water DistrictWA5321800 · CWS · Population served: 26,519
• City of Mountlake TerraceWA5357250 · CWS · Population served: 26,402
• City of AnacortesWA5302200 · CWS · Population served: 25,109
• Cross Valley Water DistrictWA5316270 · CWS · Population served: 24,695
• Vera Water & PowerWA5391450 · CWS · Population served: 24,692
• North Perry Ave Water DistrictWA5360950 · CWS · Population served: 24,402
• Lake Meridian Water DistrictWA5341900 · CWS · Population served: 24,231
• City of Oak HarborWA5362650 · CWS · Population served: 23,675
• King County Water District #49WA5339800 · CWS · Population served: 23,492
• Monroe Water SystemWA5355820 · CWS · Population served: 23,467
• Enumclaw Water DepartmentWA5323600 · CWS · Population served: 23,276
• City of AberdeenWA5300050 · CWS · Population served: 22,867
• Pud #1 of Asotin CountyWA5393343 · CWS · Population served: 21,930
• King County Water District #125WA5341998 · CWS · Population served: 21,904
• Washington State UniversityWA5393200 · CWS · Population served: 21,506
• City of WashougalWA5393400 · CWS · Population served: 21,441
• City of West RichlandWA5394900 · CWS · Population served: 21,231
• Ridgefield Public WorksWA5372400 · CWS · Population served: 21,225
• Consolidated Irrig Dist 19 System 2WA5310221 · CWS · Population served: 21,220
• Ellensburg Water DeptWA5322950 · CWS · Population served: 20,900
• Snoqualmie WaterWA5381080 · CWS · Population served: 20,222
• King County Water District No 90WA5341150 · CWS · Population served: 20,100
• Lynden Water DepartmentWA5349150 · CWS · Population served: 20,062
• FerndaleWA5324850 · CWS · Population served: 19,305
• Summit Water & Supply CoWA5385050 · CWS · Population served: 19,125
• Spo Co Water Dist 3 Sys 1WA5393351 · CWS · Population served: 19,035
• Modern Electric Water CoWA5355600 · CWS · Population served: 18,487
• City of PoulsboWA5369150 · CWS · Population served: 18,400
• Olympic View Water & Sewer DistrictWA5363600 · CWS · Population served: 17,784
• City of Stanwood Water DeptWA5383650 · CWS · Population served: 17,586
• City of YelmWA5399350 · CWS · Population served: 17,355
• City of SunnysideWA5385400 · CWS · Population served: 17,194
• Eastern Washington UniversityWA5321900 · CWS · Population served: 17,108
• City of Port TownsendWA5369000 · CWS · Population served: 17,053