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.

101 to 177 of 177, by people served

Washington utilities whose water varies in hardness, 101 to 177, 101 to 177
Utility	Based in	Serves	Hardness, mg/L	Grains per gallon
Quistorff	Tacoma	1,113	47 to 95	2.7 to 5.6
Holiday Ranchettes	Tacoma	1,050	38 to 61	2.2 to 3.6
Town of Wilbur	Spokane	1,040	120 to 196	7 to 11.5
Bayview Beach Water District	Freeland	1,035	152 to 210	8.9 to 12.3
City of George	George	1,035	147 to 257	8.6 to 15
Lake of the Woods Community Club	Gig Harbor	870	42 to 64	2.5 to 3.7
Town of St John	St John	800	89 to 124	5.2 to 7.3
Whatcom County Water Dist 13	Maple Falls	795	78 to 130	4.6 to 7.6
Lake Holiday Association	Port Orchard	740	54 to 62	3.2 to 3.6
Lewis Co Water Sewer Dist #6	Mossyrock	740	106 to 122	6.2 to 7.1
Union	Union	700	36 to 69	2.1 to 4.1
McNeil Island Water	Tumwater	692	28 to 61	1.6 to 3.6
Town of Fairfield	Tekoa	643	102 to 122	6 to 7.1
Jaw Farms Inc	Malott	636	132 to 183	7.7 to 10.7
Colton Water Department	Colton	632	119 to 137	7 to 8
Wishram Water System	Goldendale	599	56 to 80	3.2 to 4.7
Tahuyeh Lake Community Club	Port Orchard	560	21 to 74	1.2 to 4.3
Foxhall	Tacoma	549	41 to 97	2.4 to 5.7
Great Basin Water Kiona	Pasco	520	90 to 282	5.3 to 16.5
Mount Baker Water Association	Bellingham	500	51 to 74	3 to 4.3
S & I	Tacoma	482	51 to 100	3 to 5.8
Classic Heights	Tacoma	480	116 to 130	6.8 to 7.6
Pomona View Mobile Park	Yakima	470	60 to 283	3.5 to 16.5
Carrolls Water Assn	Napavine	449	94 to 152	5.5 to 8.9
Rosedale Heights Trailer Park	Tacoma	444	54 to 77	3.2 to 4.5
Combined Water System	Coupeville	435	110 to 210	6.4 to 12.3
Seven Bays Estates Unlimited	Spokane	431	82 to 136	4.8 to 8
Hawley Hills 686	Lacey	425	59 to 72	3.5 to 4.2
Big Bend Landowners Association	Monroe	419	44 to 100	2.5 to 5.8
Henderson Boulevard	Tacoma	418	52 to 61	3 to 3.6
White Bluff Water Association	Kennewick	386	34 to 179	2 to 10.5
Creston Public Water	Waverly	348	142 to 204	8.3 to 11.9
Nisqually Sportsmens Club	Port Orchard	341	50 to 65	2.9 to 3.8
Rustlewood	Shelton	322	59 to 82	3.5 to 4.8
Stratford Road Estates	Moses Lake	312	109 to 122	6.4 to 7.1
Fordyce Water Assn	Husum	302	56 to 66	3.3 to 3.9
West Ridge Water System	Coupeville	275	180 to 230	10.5 to 13.5
Town of Spangle	Spangle	270	94 to 123	5.5 to 7.2
Hartline Water System	Yakima	249	100 to 165	5.8 to 9.6
Vistas Inc	Sequim	241	130 to 184	7.6 to 10.8
Holiday Hideaway Water Co	MT Vernon	235	54 to 292	3.2 to 17.1
Strattonwood	Tacoma	220	57 to 97	3.3 to 5.6
Forest Beach Water System	Gig Harbor	204	55 to 196	3.2 to 11.5
Wallula Water District	College Place	200	13 to 98	0.7 to 5.7
Marcus Water Dept		191	147 to 380	8.6 to 22.2
Sun Harbor Water District #3	Burbank	187	52 to 270	3 to 15.8
Driftwood Cove	Poulsbo	175	60 to 61	3.5 to 3.6
Dawnbreaker Water Association	Port Orchard	168	117 to 138	6.8 to 8.1
Tyee Beach Water Association	Camano Island	158	160 to 200	9.4 to 11.7
Wagon Wheel	Coupeville	150	170 to 210	9.9 to 12.3
Hilltop Water Owners Association	Lummi Island	137	99 to 162	5.8 to 9.5
Beverly Water District	Mattawa	120	98 to 152	5.7 to 8.9
Arcadia Estates	Union	110	59 to 72	3.5 to 4.2
Town of Hatton	Moses Lake	105	118 to 169	6.9 to 9.9
Owl Creek	Woodland	102	3.7 to 120	0.2 to 7
Sky Meadows Ranch Country Club WTR	Cle Elum	98	35 to 96	2.1 to 5.6
San Juan Vista	Sekiu	94	46 to 186	2.7 to 10.9
Aspinwall Estates	Tacoma	93	80 to 130	4.7 to 7.6
Indian Village Estates Water Assn	Spokane	90	127 to 206	7.4 to 12
Pioneer	Olympia	84	53 to 172	3.1 to 10.1
Limestone Point Water Company Inc	Friday Harbor	81	143 to 197	8.4 to 11.5
Mitchell Point Water Assn	Friday Harbor	81	38 to 293	2.2 to 17.2
Kahler Community Utilities	Wentachee	78	41 to 109	2.4 to 6.4
High Ridge	Port Orchard	73	32 to 119	1.9 to 7
Pleasant Valley Water System	Ferndale	73	60 to 90	3.5 to 5.3
Mooreland Water Corp	Gig Harbor	68	144 to 517	8.4 to 30.2
North High Rock Estates W.S.	Arlington	68	29 to 71	1.7 to 4.1
Hannah Heights Owners Association	Friday Harbor	66	127 to 260	7.4 to 15.2
Madrona Ridge Homeowners	Port Orchard	65	58 to 77	3.4 to 4.5
Orchard Beach Community	Union	64	46 to 70	2.7 to 4.1
Alpine Acres Community Association	Cashmere	51	42 to 78	2.5 to 4.5
Hidden Valley Guest Ranch	Cle Elum	43	2.3 to 167	0.1 to 9.8
Mountain Shores Cc	Grapeview	40	57 to 100	3.3 to 5.8
Fairway Number Three Water	Friday Harbor	39	39 to 83	2.3 to 4.8
Cole Point Association	Port Orchard	37	56 to 170	3.3 to 9.9
Ridgeview Park Estates	Spokane	30	97 to 124	5.7 to 7.3
North Forty Property Owners Assn	Friday Harbor	27	50 to 91	2.9 to 5.3

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.

101 to 177 of 177, by people served

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