Washington utilities whose water varies in hardness.

Water in more than one band, depending on where or when it was sampled: each is given as its range, softest to hardest. 177 utilities serving 4 million people as they report it, largest first.

1 to 100 of 177, by people served

Washington utilities whose water varies in hardness, 1 to 100
Utility	Based in	Serves	Hardness, mg/L	Grains per gallon
City of Tacoma Water Division	Tacoma	446,245	12 to 197	0.7 to 11.5
City of Vancouver	Vancouver	373,047	55 to 130	3.2 to 7.6
City of Spokane	Spokane	346,138	87 to 174	5.1 to 10.2
City of Bellevue	Bellevue	321,349	47 to 79	2.7 to 4.6
Kent Water Department	Kent	166,421	16 to 120	0.9 to 7
Clark Public Utilities	Vancouver	153,526	25 to 140	1.5 to 8.2
Lakehaven Water and Sewer District	Federal Way	148,809	100 to 146	5.8 to 8.5
City of Kennewick	Kennewick	118,164	64 to 212	3.7 to 12.4
City of Renton	Renton	108,091	48 to 125	2.8 to 7.3
City of Auburn	Auburn	107,655	61 to 128	3.6 to 7.5
City of Richland	Richland	106,499	70 to 266	4.1 to 15.6
Lacey Water Department	Lacey	105,178	32 to 120	1.9 to 7
Highline Water District	Kent	100,170	70 to 166	4.1 to 9.7
City of Puyallup	Puyallup	94,520	48 to 106	2.8 to 6.2
Marysville Utilities	Marysville	88,582	58 to 76	3.4 to 4.5
Lakewood Water District	Lakewood	82,425	39 to 98	2.3 to 5.7
Sammamish Plateau Water & Sewer	Sammamish	79,362	51 to 95	3 to 5.6
City of Bremerton	Bremerton	72,951	33 to 120	1.9 to 7
Southwood	Tacoma	64,155	30 to 101	1.8 to 5.9
Issaquah Water System	Issaquah	43,584	58 to 93	3.4 to 5.4
Walla Walla Water Division	Walla Walla	42,959	28 to 70	1.6 to 4.1
Nob Hill Water Association	Yakima	38,050	24 to 67	1.4 to 3.9
Firgrove Mutual Inc	Puyallup	36,168	44 to 102	2.6 to 6
Silverdale Water Dist 16	Silverdale	35,163	40 to 98	2.3 to 5.7
Parkland Light & Water Company	Tacoma	33,775	48 to 83	2.8 to 4.9
City of Moses Lake	Moses Lake	32,428	2.5 to 191	0.1 to 11.2
City of Arlington	Arlington	29,508	42 to 84	2.4 to 4.9
West Sound Utility District #1	Port Orchard	28,930	40 to 81	2.3 to 4.8
Whitworth Water District 2	Mead	26,883	107 to 232	6.3 to 13.6
City of Oak Harbor	Oak Harbor	23,675	21 to 258	1.2 to 15.1
Enumclaw Water Department	Enumclaw	23,276	45 to 64	2.6 to 3.7
PUD #1 of Asotin County	Clarkston	21,930	17 to 93	1 to 5.4
Washington State University	Pullman	21,506	116 to 124	6.8 to 7.3
City of West Richland	West Richland	21,231	12 to 237	0.7 to 13.9
Ellensburg Water Dept	Ellensburg	20,900	39 to 99	2.3 to 5.8
Snoqualmie Water	Snoqualime	20,222	34 to 93	2 to 5.4
Summit Water & Supply Co	Tacoma	19,125	64 to 124	3.7 to 7.3
Modern Electric Water Co	Spokane	18,487	69 to 121	4 to 7.1
City of Stanwood Water Dept	Stanwood	17,586	106 to 222	6.2 to 13
City of Sunnyside	Sunnyside	17,194	4.9 to 177	0.3 to 10.4
City of Cheney	Cheney	16,954	110 to 160	6.4 to 9.4
Gig Harbor Water Dept	Gig Harbor	16,510	42 to 67	2.5 to 3.9
North Peninsula	Poulsbo	16,449	60 to 110	3.5 to 6.4
Port Orchard Water Dept	Port Orchard	15,355	50 to 81	2.9 to 4.7
Quimper	Port Townsend	14,548	86 to 160	5 to 9.4
Liberty Lake Sewer & Water District	Liberty Lake	14,500	77 to 139	4.5 to 8.1
City of Sequim	Sequim	14,293	71 to 133	4.2 to 7.8
City of Bainbridge Island	Bainbridge Island	13,491	27 to 63	1.6 to 3.7
City of Grandview	Grandview	11,010	132 to 230	7.7 to 13.5
Manchester Water District	Manchester	10,475	51 to 94	3 to 5.5
City of Selah	Selah	9,331	53 to 199	3.1 to 11.6
Port Angeles Composite	Carlsborg	8,872	52 to 176	3.1 to 10.3
Ephrata Water Department	Ephrata	8,718	93 to 132	5.4 to 7.7
City of North Bend	North Bend	8,710	38 to 88	2.2 to 5.1
Yak Co - Terrace Heights	Yakima	8,410	78 to 147	4.6 to 8.6
College Place Water Dept	College Place	8,147	60 to 77	3.5 to 4.5
Stevens Co PUD - Suncrest	Loon Lake	7,484	160 to 282	9.4 to 16.5
Peacock Hill	Tacoma	7,401	38 to 103	2.2 to 6
Jblm McChord Field	Joint Base Lewis - McChord	7,290	41 to 94	2.4 to 5.5
City of Blaine	Blaine	6,800	4.8 to 142	0.3 to 8.3
City of Elma	Elma	6,638	52 to 80	3 to 4.7
Snoqualmie Pass Utility District	Snoqualmie Pass	5,832	31 to 146	1.8 to 8.5
Artondale	Tacoma	5,828	57 to 98	3.3 to 5.7
Moxee Water Department	Moxee	5,599	23 to 105	1.3 to 6.1
North Bainbridge Water Co	Poulsbo	5,490	39 to 92	2.3 to 5.4
City of Deer Park	Deer Park	5,435	110 to 138	6.4 to 8.1
Westport Water Department	Westport	5,346	59 to 88	3.5 to 5.1
City of Connell	Connell	5,150	26 to 181	1.5 to 10.6
Minterbrook	Tacoma	5,083	37 to 100	2.2 to 5.8
City of Warden	Warden	4,674	80 to 220	4.7 to 12.9
Pattison 500	Lacey	4,643	56 to 70	3.3 to 4.1
South Bainbridge	Poulsbo	4,414	88 to 210	5.1 to 12.3
East Spokane Water Dist 1	Spokane Valley	4,285	123 to 222	7.2 to 13
Trentwood Irrigation District 3	Spokane	4,228	155 to 222	9.1 to 13
City of White Salmon	White Salmon	4,077	33 to 73	1.9 to 4.3
Eastsound Water Users Association	Eastsound	3,711	54 to 196	3.1 to 11.5
Lake Cushman System 5	Hoodsport	3,675	44 to 86	2.5 to 5
Forks Municipal Water Dept	Forks	3,468	44 to 72	2.6 to 4.2
City of Newport	Newport	3,331	170 to 240	9.9 to 14
Fox Island Mutual Water Assoc	Fox Island	3,255	59 to 110	3.5 to 6.4
Sno PUD 1 - Warm Beach	Everett	2,977	53 to 115	3.1 to 6.7
Stevens Co PUD - Deer Lake	Loon Lake	2,884	38 to 74	2.2 to 4.3
McCormick Woods	Port Orchard	2,760	44 to 81	2.6 to 4.7
Olympic Mall	Tacoma	2,681	44 to 75	2.6 to 4.4
Camano Water Association	Coupeville	2,592	165 to 190	9.6 to 11.1
Stevens Co PUD - Loon Lake	Loon Lake	2,487	78 to 185	4.6 to 10.8
Town of Darrington	Darrington	2,246	54 to 68	3.1 to 4
Sunland Water District	Sequim	2,235	180 to 181	10.5 to 10.6
Alderbrook Water Co	Union	2,154	43 to 69	2.5 to 4
Sunnyslope	Shelton	2,112	39 to 69	2.3 to 4
Mirrormont	Tacoma	2,083	52 to 87	3 to 5.1
Nisqually Pines Community Club	Port Orchard	2,037	46 to 68	2.7 to 4
Canterwood Water System	Gig Harbor	1,805	46 to 159	2.7 to 9.3
Bingen Water Dept	Bingen	1,758	30 to 61	1.7 to 3.6
Basin City Water Sewer District	Mesa	1,740	153 to 302	8.9 to 17.7
Consolidated Irrigation Dist 14	Walla Walla	1,555	49 to 76	2.8 to 4.4
Lake Minterwood	Tacoma	1,539	44 to 100	2.6 to 5.8
City of Tieton Water Dept	Yakima	1,475	78 to 139	4.6 to 8.1
Ponderosa Community Club Inc	Leavenworth	1,170	58 to 78	3.4 to 4.6
Town of Waterville	Waterville	1,140	97 to 325	5.6 to 19

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 177, by people served

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