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.

201 to 300 of 501, by people served

Washington utilities with moderately hard water, 201 to 300, 201 to 300
Utility	Based in	Serves	Hardness, mg/L	Grains per gallon
Mountain Park Water System	Gig Harbor	198	67	3.9
Town of Latah	Waverly	194	119	7
Metaline Water Dept	Lone	193	104	6.1
Woodland Manor	Union	192	75	4.4
Harbor Heights	Tacoma	188	68	4
Mountain View Water Association	Lynden	186	100	5.8
Newaukum Ventures	Napavine	186	61	3.6
Kopachuck Ridge Water District	Gig Harbor	185	97	5.7
Roy 325th 668	Lacey	185	76	4.4
Burnsville 676	Lacey	183	114	6.7
Ranch	Tacoma	183	64	3.7
Spanaway 192nd 669	Lacey	183	84	4.9
Burns Point	Port Orchard	182	68	4
Dungeness Beach	Sequim	181	110	6.4
Malone	Napavine	181	78	4.6
Holiday Valley	Port Orchard	180	70	4.1
Lombard Loop Water Association	Wapato	180	116	6.8
Willow Tree Park	Yakima	176	73	4.3
Fieldstone Memory Care Bainbridge	Lake Tapps	175	89	5.2
Olympic View Community LLC	Port Orchard	175	69	4
Rockaway Beach Water	Bainbridge Island	175	88	5.1
Southgate Water Company	Pasco	175	97	5.7
Coach Country Corral	Port Orchard	170	62	3.6
Crystal Lake Inc	Woodinville	170	83	4.8
Edwall Water Assn	Edwall	170	102	6
Lakewood Heights	Shelton	170	88	5.2
Sea View	Montesano	170	72	4.2
Orient Water Company	Republic	167	77	4.5
Lakeside Shores Improvement Assoc.	Arlington	166	94	5.5
Horsfall 608	Lacey	165	75	4.4
Sunset Water Distribution Assoc	Stanwood	159	120	7
Palomino Fields	Cle Elum	156	96	5.6
Snow Creek	Port Townsend	156	91	5.3
Lake Meridian Estates (MHP)	Kent	154	81	4.7
Shadowood	Shelton	154	91	5.3
Silvana Water Association	MT Vernon	153	110	6.4
Sportsman Trailer Park	Ellensburg	151	108	6.3
Upper Preston Water Assn	Falls City	150	105	6.1
Hidden Haven Mobile Home Park	Belfair	149	80	4.7
Johanson	Tacoma	148	70	4.1
Israel Place San Angelo Park	Tacoma	146	62	3.6
Wildaire Estates	Chehalis	146	84	4.9
Lake Tuck	Tacoma	143	86	5
Mainland View Manor	Tacoma	143	90	5.3
Martell Mobile Manor	Port Orchard	143	81	4.7
Deschutes Village 683	Lacey	140	66	3.9
Forest Hills Water System	Gig Harbor	140	85	5
Holly Tides	Tacoma	140	69	4
Lakeview Terrace	Coupeville	140	120	7
River Bend Water System	Newport	140	87	5.1
Minter Creek Rapids	Tacoma	137	69	4
Lakeview Terrace MHP	Port Orchard	135	112	6.5
Lake Grove Water Association	Coupeville	134	120	7
Turtlerock Homeowners Association	Wenatchee	133	95	5.5
Maple Grove	Sequim	132	78	4.6
Wyckoff Farms	Grandview	131	81	4.8
Gala Pines Water.	Poulsbo	130	82	4.8
Portland Fair Estates	Friday Harbor	130	113	6.6
Skookumchuck 612	Lacey	130	104	6.1
Twenty - Three 800 Tiger Mountain	Port Orchard	129	74	4.3
Bethel East	Port Orchard	127	96	5.6
Forest Park	Tacoma	127	89	5.2
Parklane Water Association	Stanwood	127	99	5.8
Lake Terrill Water Assoc	Lynden	125	100	5.8
Tolmie Cove	Port Orchard	125	90	5.3
Discovery Bay Leaseholders	Sequim	123	64	3.7
Regency Park	Tacoma	123	72	4.2
Enchanted Firs Mobile Estates	Allyn	120	94	5.5
Mantheys Country Mobile Park	Lynden	120	86	5
Cascade Highlands North	Tacoma	119	94	5.5
Foss Road	Tacoma	119	64	3.7
Quilcene	Port Townsend	119	96	5.6
Yak Co - Gala Estates Water System	Yakima	119	73	4.3
Viewside Community	Poulsbo	118	77	4.5
Cedar Lynn Water Assoc	Lynden	116	114	6.7
Minter Beach Estates	Gig Harbor	116	78	4.5
Valley View Estates Water Assn	MT Vernon	113	116	6.8
Cherry Park	Union	111	100	5.8
Longbranch Shores Water Association	Port Orchard	111	82	4.8
Madrona Point	Tacoma	111	81	4.7
Royalwood	Tacoma	111	91	5.3
Central Mobile Home Park	Ellensburg	110	110	6.4
Century Water Association	Lynden	110	92	5.4
Holmes Harbor Water Co	Coupeville	110	90	5.3
Twin View Estates Community Assoc	Greenbank	110	90	5.3
Burnett Water District	Buckley	109	70	4.1
Homestead Acres	Tacoma	109	78	4.6
Ranch Acre	Tacoma	109	95	5.5
Riverwood Park Community Club	Port Orchard	109	86	5
Lake - O - the - Woods	Freeland	108	70	4.1
Ryanwood Improvement Assn	Port Orchard	108	84	4.9
Beulah Park Community	Port Orchard	106	88	5.1
Cuyamaca Village	Tacoma	106	77	4.5
Pebble Ridge	Port Orchard	106	70	4.1
Rumbolz Sunset Water System	Snoqualmie	106	80	4.7
Homestead Mobile Home Park	Tonasket	105	91	5.3
Salkum Water Supply	Salkum	103	92	5.4
Clear Creek Estates	Tacoma	101	86	5
Bertsch Subdivision Water Assn	Yakima	100	113	6.6
Brocious Water System	Yakima	100	61	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.

201 to 300 of 501, by people served

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