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.

401 to 501 of 501, by people served

Washington utilities with moderately hard water, 401 to 501, 401 to 501
Utility	Based in	Serves	Hardness, mg/L	Grains per gallon
Suburban Mobile Park	Coupeville	60	110	6.4
Paradise Cove Resort & Rv Park	Castle Rock	59	100	5.8
Phelps Road	Tacoma	58	104	6.1
Vista Glen	Port Orchard	58	72	4.2
Golden Oak	Port Orchard	57	62	3.6
Badger Lake Estates LLC	Port Orchard	56	95	5.6
Harstine Island Estates Assn	Port Orchard	56	70	4.1
85 Acres	Sun Valley	55	76	4.4
Meadowbrook Village	Sequim	55	82	4.8
Spencer Glen	Port Orchard	55	95	5.6
Webster Hill 610	Lacey	55	96	5.6
Hoot Ridge	Port Orchard	54	102	6
Tulare Beach Association	Everett	54	87	5.1
Crescent Park	Tacoma	53	110	6.4
Eagle Estates	Tacoma	53	82	4.8
Gunderson Water Works	Napavine	53	108	6.3
Harbor Crest	Poulsbo	53	100	5.8
Hi - Color Orchard Farmworker Housing	Wenatchee	53	100	5.8
Karen Place	Tacoma	53	110	6.4
Mats View	Port Townsend	52	65	3.8
Lake Serene Water System	Lake Forest Park	50	92	5.4
Pleasant Valley 307	Lacey	50	94	5.5
Winston Creek Rv Park	Napavine	50	66	3.9
Brianwood	Poulsbo	48	120	7
Clerget 253	Lacey	48	92	5.4
Pit Water Co 328	Lacey	48	72	4.2
Rainwood	Tacoma	48	120	7
Scandialand Mobile Home Park	Port Orchard	48	68	4
Panther Lake Community Water System	Arlington	47	95	5.6
Muck Creek Hill	Tacoma	46	66	3.9
North Beverly Beach Association	MT Vernon	46	120	7
Wildlife Acres Water Association	Maple Falls	46	90	5.3
Inlets End	Tacoma	45	114	6.6
Kuzmanich Water System	Puyallup	45	94	5.5
Laurel West Water Association	Lynden	45	90	5.3
Sauk Mountain Estates	Rockport	45	61	3.6
Sunnyview Terrace Association Inc	Gig Harbor	45	84	4.9
Sunset Farm	Port Orchard	45	71	4.2
Vista Dunes Water Association	Raymond	45	88	5.1
Whiskey Hollow 670	Lacey	45	65	3.8
Williams Lake Beach Club	Tekoa	45	106	6.2
Cougar Campers	Cle Elum	44	68	4
Green Acres Water Association	Port Orchard	44	84	4.9
Meadow Wood 689	Lacey	43	67	3.9
Sehmel Road	Tacoma	42	63	3.7
Graham Place	Port Orchard	41	81	4.7
Agate Bay MHP	North Bend	40	71	4.2
Baker View Water Assoc	Lynden	40	68	4
Clouse Water System	Port Orchard	40	94	5.5
Dechaux Mutual Water	Port Orchard	40	80	4.7
Minter View Water System	Gig Harbor	40	78	4.6
Prospect Heights Comm Water Assn	Walla Walla	40	105	6.1
Viewcrest Beach	Union	40	94	5.5
Vinson S Villa Mhp/Roy Wye Inn	Gig Harbor	40	72	4.2
East Crystal Lake Estates Community	MT Vernon	38	114	6.7
Crystal Springs	Tacoma	37	71	4.2
New Hope Farms	Goldendale	37	86	5
Noble Woods Water System	Lake Forest Park	37	63	3.7
Royal Coachman Mobil Est	Ferndale	37	70	4.1
Schmid	Tacoma	37	66	3.9
Sherman Hill	Belfair	37	61	3.6
Verdan Anderson Hill	Tacoma	37	73	4.3
Campo Verde Street & Water Assn	Port Orchard	36	68	4
E.L.C. Water System	Eastsound	36	82	4.8
Reed Ranch Road Water	Maple Valley	36	64	3.7
Rolf Bruun	MT Vernon	36	105	6.1
Seabold Heights	Port Orchard	36	69	4
Braunwood Estates	Auburn	35	64	3.7
Hidden Heights	Port Orchard	35	82	4.8
Lincoln Hill Estates	Port Orchard	35	84	4.9
Sexton	Olympia	35	70	4.1
Billington	Maple Valley	34	68	4
Red Cedar Estates	Tacoma	34	120	7
Sage Hills Second Water System	Warden	34	90	5.3
Walden Water	Tacoma	34	94	5.5
Olympic View Estates	Stanwood	33	119	7
Tulip Meadows	Woodland	33	84	4.9
Brandt Point	Sequim	32	85	4.9
Brookhaven	Tacoma	32	68	3.9
Dallesport Domestic Water Sharers	Dallesport	32	97	5.7
Owners Assoc of Beach Club Condos	Lummi Island	31	82	4.8
Puyallup River Rv Park	Puyallup	31	72	4.2
Cascade View Estates #4	Cle Elum	30	64	3.7
Cottage Farms	Cle Elum	30	61	3.6
Desert Hills	Moses Lake	30	86	5
Edgewater	Yakima	30	93	5.4
Fern Bluff Estates	Monroe	30	85	5
Turf Trails Domestic	Cle Elum	30	111	6.5
Dakota Heights Water System	Cle Elum	29	113	6.6
Cascade View Estates #1	Cle Elum	28	62	3.6
Eaglecrest Water & Road Association	Coupeville	28	112	6.5
Islandwood Estates	Port Orchard	28	73	4.3
Cascade View Road Water System	Freeland	26	100	5.8
Ocosta Mobile Home Park LLC	Aberdeen	26	72	4.2
Bridge Road	Vancouver	25	64	3.7
Cascade View Estates #3	Cle Elum	25	64	3.7
Winlock Waters 2	Napavine	25	75	4.4
Hazel Dell Mobile Park	Woodland	24	110	6.4
West Deer Lake #1	Langley	24	62	3.6
Goldens Mobile Home Park	Port Orchard	23	76	4.4
Naches Rv Resort	Port Orchard	13	87	5.1

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.

401 to 501 of 501, by people served

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