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.

101 to 200 of 501, by people served

Washington utilities with moderately hard water, 101 to 200, 101 to 200
Utility	Based in	Serves	Hardness, mg/L	Grains per gallon
Dallesport Water District	Dallesport	598	78	4.6
Sandy Hook Park Community Club	Port Orchard	593	68	4
Town of Metaline Falls	Newport	593	64	3.7
Bay Center	Raymond	579	70	4.1
Meadowbrook Water Association	Lynden	579	102	6
Raft Island	Tacoma	575	64	3.7
Town of Rockford	Rockford	570	116	6.8
Consolidated Support Services	Medical Lake	569	87	5.1
Key Center Water System	Gig Harbor	561	87	5.1
Sno PUD 1 - Sunday Lake	Everett	561	81	4.7
Crescent Park 355	Lacey	550	94	5.5
Hamilton Water Department	Maple Falls	540	100	5.8
Sandy Hook Yacht Club Estates	Freeland	540	97	5.7
Bethel Green Acres Water Assn	Tacoma	522	68	3.9
Rolling Firs Evergreen Terrace	Tacoma	514	72	4.2
Kittitas County Water District #4	Thorp	510	74	4.3
Deming Water Assoc.	Deming	501	71	4.2
Sunvista Sunlight Beach HOA	Coupeville	500	110	6.4
Quail Run 667	Lacey	493	76	4.4
South Fox Island Water System	Gig Harbor	493	86	5
Town of Oakesdale	Oaksdale	492	96	5.6
Dungeness Meadows	Sequim	488	83	4.9
Roosevelt Lake Ranch	Wilbur	487	106	6.2
Louie Joe Water Association	Everson	471	100	5.8
Monterra	Sequim	464	110	6.4
Hartstene Pointe	Shelton	460	90	5.3
Country Manor Mobile Home Park	Port Orchard	450	63	3.7
Delta Water Association	Lynden	450	106	6.2
Four Lakes Water District 10	Four Lakes	433	72	4.2
Hmc Management Water System	Port Orchard	432	97	5.7
Harbor Country Apartments	Port Orchard	410	62	3.6
Vantage Water System	Vantage	405	61	3.6
Lake Retreat Camp & Conf Center	Ravensdale	404	120	7
Bucklin	Tacoma	402	77	4.5
Northwest Water Assoc. Inc.	Lynden	400	70	4.1
Tatoosh Water Company	MT Vernon	387	74	4.3
Lazy C	Port Townsend	367	88	5.1
Alpine Hills	Tacoma	363	68	4
Golden Plains MHP #1	Moses Lake	360	99	5.8
Lake Lucinda Community Club	Shelton	360	68	4
Mains Farm Property Owners	Sequim	358	103	6
Lisecc	Lummi Island	357	100	5.8
Canterbrook Village Apartments	Port Orchard	355	70	4.1
Sierra Water System	Puyallup	355	102	6
Chiwawa Communities Assn	Leavenworth	352	107	6.3
Winchester Mobile Homes Water	Spanaway	350	100	5.8
Washington Land Yacht Harbor	Port Orchard	340	75	4.4
Kackman Creek	MT Vernon	330	70	4.1
Black Lake Estates	Tacoma	329	63	3.7
Coyle	Port Townsend	329	82	4.8
Hawk Acres 607	Lacey	328	76	4.4
Loveland Mobile Estates	Port Orchard	317	72	4.2
Sunwood Graham	Port Orchard	315	86	5
Canyon Village Water System Inc	Yakima	310	65	3.8
Andrews First	Tacoma	299	90	5.2
Colony Surf Water Supply	Lilliwaup	297	81	4.7
McKees Beach Assoc	MT Vernon	290	90	5.3
Peterson Farms	Woodland	290	73	4.3
Shorecrest	Tacoma	289	65	3.8
Cedar Glen Mobile Home Park	Port Orchard	284	80	4.7
Indian Hills Estates	Poulsbo	282	73	4.3
River Park	Tacoma	277	115	6.7
Sun Country Estates 1 - 2 - 3	Wenatchee	277	66	3.9
Raspberry Ridge Water Association	Lynden	276	100	5.8
Bethel Water Co	Lacey	270	80	4.7
Skamokawa Water System	Cathlamet	267	86	5
Y - Squalicum Water Assn	Lynden	260	96	5.6
Emerald Heights	Port Orchard	251	82	4.8
Aqua Copia/Horse Country Estates	Snohomish	250	119	7
Eagle Ridge	Arlington	250	110	6.4
Great Western Mobile Home Park	Vancouver	250	120	7
Prairie Ridge 605	Lacey	250	89	5.2
Western Ranchettes Inc.	Black Diamond	250	90	5.2
Tempo Lake Water Co	Port Orchard	246	98	5.7
Columbus Park	Port Orchard	241	65	3.8
Dixie Water Association	Walla Walla	240	112	6.5
Kopachuck	Tacoma	236	86	5
Fragaria Landing	Port Orchard	235	61	3.6
Strawberry Hill	Poulsbo	235	72	4.2
Island Lake Manor	Shelton	233	72	4.2
Maury Mutual Water Co	Vashon	233	72	4.2
Murdock Water	Dallesport	233	94	5.5
Port Madison Water Company	Port Orchard	233	101	5.9
Nelson Ridge	Tacoma	232	82	4.8
Belfern Water Association	Lynden	228	68	4
Camelot and Western Skies	Tacoma	228	71	4.2
Cristalina	Tacoma	225	71	4.2
Four Seasons Park	Sequim	225	65	3.8
Seashore Villa	Port Orchard	225	62	3.6
Driftwood Shores Water System Inc	MT Vernon	222	110	6.4
Maple Falls Water Coop	Maple Falls	222	80	4.7
Wollochet Harbor Club Inc	Gig Harbor	221	72	4.2
Shaws Cove	Tacoma	217	86	5
Malden Water Dept	Rosalia	215	108	6.3
Dana Passage 523	Lacey	210	100	5.8
Pine Lake Mobile Home Est 1 3	Tacoma	207	77	4.5
Auburn Park Community LLC	Port Orchard	202	76	4.4
Mount Si Mobile Home Estates	North Bend	200	90	5.3
Paradise Park Water System	Ferndale	200	62	3.6
Hillcrest Mobile Home Park	Lakewood	198	62	3.6

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.

101 to 200 of 501, by people served

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