Washington utilities with moderately hard water.

61 to 120 mg/L (3.6 to 7 grains per gallon). 501 utilities serving 1 million people as they report it, largest first.

301 to 400 of 501, by people served

Washington utilities with moderately hard water, 301 to 400, 301 to 400
Utility	Based in	Serves	Hardness, mg/L	Grains per gallon
Doc Stewart	Yakima	100	120	7
Eggimann 664	Lacey	100	84	4.9
Eltopia Water Association	Eltopia	100	75	4.4
Hillcrest Manor	Vancouver	100	95	5.5
Opr H2a	Yakima	100	69	4.1
Tall Cedars Estates Water Assoc.	Ferndale	100	118	6.9
Whispering Pines	Port Orchard	100	94	5.5
T - 11 Farmworker Housing	Wenatchee	99	110	6.4
Wilderwood HOA	Port Orchard	98	98	5.7
Sun Island Maintenance Assn	Cle Elum	97	64	3.7
Winchester Farmworker - Cfp	Wenatchee	96	110	6.4
Aloha Pines Estates Water System	Elk	95	91	5.3
Riverview	Tacoma	95	67	3.9
Graystone WS	Pasco	94	69	4
Lews 81st 225	Lacey	92	74	4.3
Peninsula Mobile Park	Allyn	92	82	4.8
Prospect Water Assn Inc	Yakima	92	110	6.4
Whispering Rock Farmworker Housing	Wenatchee	92	61	3.6
Pioneer Park Water System	Port Orchard	91	76	4.4
Beachwood Water Company	Coupeville	90	96	5.6
Cedar Shores 677	Lacey	90	64	3.7
Country Meadows	Port Orchard	90	71	4.2
Deer Lake Haven Inc	Freeland	90	88	5.1
Giffords 685	Lacey	90	95	5.6
Golden Meadow	Tacoma	90	68	4
Prairie Acres Water System	Maple Falls	90	89	5.2
Single Tree Acres	Vancouver	90	79	4.6
Skookumchuck Mobile Manor	Napavine	90	62	3.6
Springwood	Union	90	62	3.6
Whiteside Homeowners Association	MT Vernon	90	93	5.5
Maxvale 618	Lacey	88	85	5
Eloika Pines LLC	Port Orchard	87	66	3.9
Mayfield Kamper Klub	Napavine	87	62	3.6
Mount Baker Mobile Home Park	Bellingham	87	114	6.7
Orchard Grove	Port Orchard	86	68	4
Creekside Meadows Division II	Tacoma	85	97	5.7
Ferndale Estates LLC	Ferndale	85	112	6.5
Hazelwood Heights	Auburn	85	77	4.5
Purdy Acres East	Tacoma	85	73	4.2
South Shady Acres Water	Port Orchard	85	78	4.6
Spring Point Homeowners Association	Deer Harbor	85	100	5.8
Sandy Shore & Sunnyside Meadows	Newport	83	96	5.6
Shawnee Hills Water System	Gig Harbor	83	78	4.6
Stilliridge	Port Orchard	83	80	4.7
Wonderland Water Company	Union	82	63	3.7
Inwood Beach Club	Port Orchard	80	104	6.1
Issaquah Valley Water Assn #1	Issaquah	80	71	4.2
Poulsbo Heights	Poulsbo	80	100	5.8
Patterson Lake Water	Napavine	79	80	4.7
Columbia Rim Water System	Yakima	77	94	5.5
Four Corners	Tacoma	77	71	4.1
River Ridge Estates	Pasco	77	95	5.6
Heart O the Hills	Sequim	76	70	4.1
Harborland Mobile Park	Port Orchard	75	100	5.8
Wilderness Glen 263	Lacey	75	108	6.3
Marshall Community Water Assn	Marshall	74	83	4.8
Tulalip Shores Water System	Arlington	74	90	5.3
Madrona Park	Shelton	73	62	3.6
Olympic View	Port Orchard	73	92	5.4
Steamboat Island Inc	Port Orchard	73	95	5.6
Lookout Point	Tacoma	72	84	4.9
Mountain View	White Salmon	72	63	3.7
Lone Lake Shores Community Assn	Langley	71	118	6.9
Luana Water Assn.	Port Orchard	71	85	4.9
Vanridge Mobile Home Park	Woodland	71	105	6.1
Wolf Creek Property Owners Assn	Tonasket	71	86	5
Badger Canyon Ranchettes #2	Port Orchard	70	78	4.6
Heritage West	Port Orchard	70	82	4.8
Kapowsin Water District	Puyallup	70	64	3.7
Mountain Lakeview 619	Lacey	70	78	4.6
Pinewood Glen Mutual Water Assn	Spanaway	70	82	4.8
Wolfe Water Association	Yakima	70	87	5.1
Dunbar Cove Development Assoc.	Port Orchard	69	100	5.8
Happy Hill Community Club	Port Orchard	69	90	5.3
Pacific Ventures	Tacoma	69	82	4.8
Southcreek #1	Tacoma	69	69	4
Welchs Water Association	Port Orchard	69	72	4.2
Belwood Park	Tacoma	66	74	4.3
Gresham Water	Poulsbo	66	62	3.6
Kyak Ridge Water System	Arlington	66	110	6.4
Predator Ridge	Pasco	66	85	5
Quail Run	Lacey	66	62	3.6
Holiday Acres	Shelton	65	60	3.5
Horsehead Bay Water	Port Orchard	65	110	6.4
Little Lake Mobile Home Park	Tacoma	65	79	4.6
Parkwood	Sun Valley	65	98	5.7
Ryanwood	Tacoma	64	62	3.6
Sylvan Terrace Condominiums	Shelton	64	66	3.9
J & B Orchards - South	Pasco	63	65	3.8
Sun Tides Community LLC	Port Orchard	63	66	3.9
Campbells Glen	Clinton	62	88	5.1
Forest Glen 762	Lacey	62	85	5
Iron Springs Park	Hoquiam	62	74	4.3
Curries Landing	Tacoma	61	61	3.6
Elwha Place Homeowners Assn	Port Angeles	61	83	4.9
Greenwood Estates	Tacoma	61	87	5.1
Silver Springs Estates Comm Assn	Coupeville	61	71	4.2
South Bay Terraces Water Company	Port Orchard	61	78	4.6
Peninsula Pines Park	Port Orchard	60	82	4.8
Skookum Ranch	Tacoma	60	68	3.9

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.

301 to 400 of 501, by people served

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