Washington utilities with soft water.

Up to 60 mg/L (3.5 grains per gallon). 412 utilities serving 2.5 million people as they report it, largest first.

1 to 100 of 412, by people served

Washington utilities with soft water, 1 to 100
Utility	Based in	Serves	Hardness, mg/L	Grains per gallon
Seattle Public Utilities	Seattle	1,161,961	26	1.5
City of Everett Public Works Dept.	Everett	215,774	12	0.7
City of Bellingham - Water Division	Bellingham	141,127	20	1.2
City of Olympia	Olympia	126,966	52	3
City of Yakima Water Division	Yakima	112,858	41	2.4
Skagit County PUD 1 Judy Res	Mount Vernon	111,415	22	1.3
Covington Water District	Kent	56,172	25	1.5
City of Tumwater	Tumwater	51,924	57	3.3
Jblm Lewis	Joint Base Lewis - McChord	35,414	50	2.9
Camas Municipal Water Sewer System	Camas	31,794	47	2.7
City of Port Angeles	Port Angeles	28,067	47	2.7
City of Anacortes	Mount Vernon	25,109	22	1.3
City of Aberdeen	Aberdeen	22,867	22	1.3
City of Washougal	Washougal	21,441	30	1.8
Lynden Water Department	Lynden	20,062	47	2.7
City of Port Townsend	Port Townsend	17,053	45	2.7
City of Kelso	Kelso	15,775	25	1.5
Chehalis Water Department	Chehalis	11,718	50	2.9
Hoquiam Water Department	Hoquiam	11,456	26	1.5
City of Leavenworth	Leavenworth	11,041	25	1.5
Lwwsd - South Shore Water System	Bellingham	10,028	20	1.2
Othello Water Department	Othello	8,755	21	1.3
City of Prosser	Prosser	8,030	51	3
City of Kalama	Kalama	8,020	17	1
Lake Chelan Reclamation District	Manson	6,798	21	1.2
Sallal Water Association Inc	North Bend	6,600	36	2.1
Black Diamond Water Dept	Black Diamond	6,407	27	1.6
Wapato Waterworks	Wapato	5,255	42	2.5
Grays Harbor Co Water Dist 2	Montesano	5,112	56	3.3
Long Beach Water Department	Long Beach	4,628	9.8	0.6
Raymond Water Department	Raymond	4,620	22	1.3
Belfair Water District 1	Belfair	4,432	54	3.1
Castle Rock Municipal Water	Castle Rock	4,367	21	1.3
City of Goldendale	Goldendale	4,314	35	2.1
Crystal Mountain Inc	Raymond	4,154	36	2.1
Grand Mound	Olympia	3,764	53	3.1
Parkview Terrace	Tacoma	3,730	49	2.9
City of Winlock	Winlock	3,502	45	2.6
Horizons West	Tacoma	3,454	50	2.9
Rainier Water Department	Rainier	3,103	58	3.4
City of Napavine	Napavine	3,095	44	2.6
Snake River Housing Water System	Yakima	3,036	49	2.9
Yacolt	Vancouver	3,034	47	2.7
Dry Creek Water Association	Port Angeles	3,030	54	3.1
Carson	Carson	3,015	27	1.6
Clearwood	Yelm	2,956	46	2.7
South Bend Water Department	South Bend	2,930	27	1.6
Erland Point Water Co	Silverdale	2,909	41	2.4
Western State Hospital	Port Orchard	2,857	51	3
West Sequim Bay Inc	Sequim	2,759	22	1.3
City of Gold Bar	Goldbar	2,745	43	2.5
Willapa Valley Water District	Raymond	2,425	20	1.1
City of Carnation Water System	MT Vernon	2,400	53	3.1
Boistfort Valley	Adna	2,389	30	1.8
Pacific Beach/Moclips	Montesano	2,372	59	3.5
Crescent Water Assn	Joyce	2,360	51	3
West Kitsap	Poulsbo	2,248	54	3.1
City of Kittitas	Kittitas	2,247	54	3.2
Washington Corrections Center	Shelton	2,223	40	2.3
Cle Elum Water Department	Cle Elum	2,213	23	1.3
City of Morton	Morton	2,147	34	2
Lakeland Village Water	Allyn	2,120	53	3.1
City of Roslyn	Roslyn	2,099	35	2.1
Naselle	Raymond	2,073	20	1.2
Lewis Co Water Dist #2	Onalaska	1,983	34	2
Rochester	Rochester	1,762	40	2.3
Ritzville Water Department	Ritzville	1,725	15	0.9
Clallam Bay Sekiu	Carlsborg	1,719	13	0.7
Scott Lake	Port Orchard	1,604	54	3.1
Hogans Corner	Montesano	1,458	56	3.3
High Valley Country Club	Packwood	1,425	48	2.8
Sno PUD 1 - May Creek	Everett	1,374	17	1
Evergreen Shores	Tacoma	1,329	47	2.7
Shorecrest Estates Water Co	Shelton	1,321	47	2.7
Grays Harbor Co Water Dist 1	Raymond	1,302	60	3.5
Carlyon Beach Homeowners	Olympia	1,273	53	3.1
Washington State Corrections - Women	Gig Harbor	1,205	48	2.8
Boston Harbor	Olympia	1,153	57	3.3
Newberry Hill	Poulsbo	1,143	48	2.8
Ashford Water District	Ashford	1,141	50	2.9
Beards Cove	Shelton	1,100	43	2.5
Lake Quinault	Port Orchard	1,003	13	0.7
Glacier Springs Water Assn	Trout Lake	992	18	1
Amboy Clark Public Utilities	Vancouver	991	49	2.9
Long Lake View Est 2 5	Poulsbo	923	39	2.3
Lake Cushman System 3	Hoodsport	917	51	3
Island Lake	Freeland	883	40	2.3
Carbonado Water Dept	Carbonado	875	33	1.9
Town of Pe Ell	Pe Ell	859	21	1.2
Rosedale East	Tacoma	798	53	3.1
Lyman Water Department	MT Vernon	705	42	2.5
Kittitas County Water District #5	Cle Elum	700	52	3
Oak Park	Shelton	695	50	2.9
Chinook Water District	Chinook	664	31	1.8
Startup Water District	Startup	643	32	1.9
Alderwood Estates	Puyallup	635	42	2.5
Wicks Lake Ranches	Tacoma	615	48	2.8
Lewis Co Water Dist #3	Randle	611	36	2.1
Seabeck	Poulsbo	610	47	2.7
Rainier School	Buckley	556	44	2.6

Source: Washington State Department of Health, Office of Drinking Water, 1,479 utilities, results from Jan. 7, 2020 to Sept. 22, 2026, read Oct. 10, 2026. Each sampling point is taken at its median; a figure is typical where every point falls in one band.

Also: 2 utilities’ own water quality reports, read by hand, each named on the utility’s page.

Bands are the U.S. Geological Survey’s, at 17.1 mg/L to the grain. People served is what each utility reports; where one sells water to another, the same people can be counted twice. How hardness is measured here.

1 to 100 of 412, by people served

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