California utilities with soft water.

Up to 60 mg/L (3.5 grains per gallon). 325 utilities serving 910,291 people as they report it, largest first.

1 to 100 of 325, by people served

California utilities with soft water, 1 to 100
Utility	Based in	Serves	Hardness, mg/L	Grains per gallon
El Dorado ID - Main	Placerville	128,408	12	0.7
Folsom, City of - Main	Folsom	80,969	18	1.1
City of Yuba City	Yuba City	70,256	55	3.2
City of Hanford	Hanford	62,127	11	0.6
City of West Sacramento	West Sacramento	55,991	51	3
SCWA Mather - Sunrise	Sacramento	32,812	53	3.1
San Juan Water District	Granite Bay	29,738	17	1
Placer CWA - Auburn/Bowman	Auburn	27,317	14	0.8
City of Lemoore	Lemoore	27,185	3.9	0.2
South Feather W&P - Miners Ranch	Oroville	22,638	27	1.6
Nevada ID - E. George, Banner Mountain	Grass Valley	17,154	13	0.7
City of Crescent City	Crescent City	15,202	59	3.5
Nevada ID - Loma Rica	Grass Valley	14,072	12	0.7
Sbdno County Service Area 70j	San Bernardino	12,895	18	1
Ccwd - Ebbetts Pass	San Andreas	11,545	8.2	0.5
City of Shasta Lake	Shasta Lake 4510007	10,371	53	3.1
Cal Am - West Placer	Sacramento	9,547	26	1.5
City of Orange Cove	Orange Cove	9,525	11	0.6
Georgetown Divide PUD	Georgetown	9,434	9.1	0.5
Nevada ID - Lake Wildwood	Grass Valley	9,108	15	0.9
Awa Buckhorn Plant	Sutter Creek	8,791	5.9	0.3
Earlimart PUD	Earlimart	7,679	52	3
Folsom State Prison	Represa	7,399	19	1.1
Awa, Ione	Jackson	7,227	12	0.7
City of Fort Bragg	Fort Bragg	7,117	36	2.1
Nevada ID - Lake of Pines	Grass Valley	6,870	16	0.9
Nevada ID - North Auburn	Grass Valley	6,870	14	0.8
Tahoe City PUD - Main	Tahoe City	6,411	56	3.3
Calaveras PUD	San Andreas	6,286	25	1.4
Rancho Murieta Community Servi	Rancho Murieta	5,728	42	2.5
Tud - Columbia Water System	Sonora	5,482	9.8	0.6
Ccwd - Copper Cove	San Andreas	5,187	32	1.9
Kern Valley State Prison	Delano	5,000	13	0.7
City of Grass Valley	Grass Valley	4,947	12	0.7
Union Public Utility District	Murphys	4,774	11	0.6
Tesoro Viejo Master MWC, Inc.	San Jose	4,660	14	0.8
Meadow Vista CWD	Meadow Vista	4,217	20	1.2
Armona Community Services Dist	Armona	4,143	6.9	0.4
City of Angels	Angels Camp	3,836	22	1.3
City of MT. Shasta	Mount Shasta	3,642	27	1.6
Brooktrails Township CSD	Willits	3,632	43	2.5
Cdcr - Sierra Conservation Center	Jamestown	3,571	23	1.4
Groveland Community Serv Dist	Groveland	3,400	13	0.8
Folsom, City of - Ashland	Folsom	3,300	28	1.6
City of Nevada City	Nevada City	3,148	18	1
Placer CWA - Colfax	Auburn	3,073	10	0.6
Burney Water District	Burney	3,000	42	2.5
NPS - Grant Grove	Three Rivers	2,950	11	0.7
Lerdo Sheriff S Facility	Bakersfield	2,800	11	0.7
North Yuba Water District	Brownsville	2,772	19	1.1
Pixley Public Util Dist	Pixley	2,772	26	1.5
Riverdale Public Utility District	Riverdale	2,756	9.1	0.5
Tahoe City PUD - Tahoe Cedars	Tahoe City	2,745	54	3.2
City of Weed	Weed	2,662	32	1.9
Caruthers Comm Serv Dist	Caruthers	2,613	9.4	0.5
Smith River C.S.D.	Smith River	2,568	39	2.3
Tipton Community Services Dist	Tipton	2,543	14	0.8
Agate Bay Water Company	Carnelian Bay	2,500	21	1.2
Chester Public U.D.	Chester	2,187	50	2.9
Shasta CSA - Jones Valley, #6	Redding	2,006	49	2.9
Hamilton Branch CSD	Lake Almanor	1,874	54	3.1
Christian Valley Park CSD	Jackson	1,800	13	0.8
Tud - Tuolumne Water System	Sonora	1,798	11	0.6
Tud - Ponderosa	Sonora	1,781	11	0.6
Home Garden CSD	Hanford	1,750	30	1.8
Cal Am - Isleton	Sacramento	1,693	20	1.2
Pcwa - Weimar	Auburn	1,689	11	0.6
Fall River Valley CSD	Fall River Mills	1,535	31	1.8
Hume Lake Christian Camps, Inc	Hume	1,519	17	1
Del Rey Community Serv Dist	Del Rey	1,491	36	2.1
Tahoe Keys Water Company	South Lake Tahoe	1,420	37	2.2
Tahoe City PUD - Rubicon	Tahoe City	1,384	31	1.8
Tahoe City PUD - McKinney/Quail	Tahoe City	1,245	40	2.3
Howell Mountain Mutual Water Company	Angwin	1,244	27	1.6
MT. Hermon Association, Inc.	Mount Hermon	1,176	25	1.5
Fcsa 34 - Millerton New Town	Fresno	1,109	12	0.7
Happy Camp C.S.D.	Happy Camp	1,100	57	3.3
Grizzly Flats Community Servic	Grizzly Flats	1,093	8.3	0.5
MI Wuk Village Mut WTR Co	MI Wuk Village	1,076	33	1.9
City of Trinidad	Trinidad	1,072	17	1
Placer CWA - Alta	Auburn	1,044	8.4	0.5
Ccwd - West Point	San Andreas	1,043	23	1.3
Veterans Home of California	Yountville	1,000	33	1.9
Yosemite NPS - Yosemite Valley	Yosemite Np	1,000	14	0.8
Rolling Green Utilities, Inc.	Big Pine	940	44	2.6
City of Tulelake	Tulelake	925	34	2
Lakeside Park Association	South Lake Tahoe	924	22	1.3
Fcwwd 18/friant	Friant	909	12	0.7
Del Oro Water Co. - Johnson Park	Chico	908	54	3.2
City of Dorris	Dorris	887	20	1.2
Alpaugh Community Services District	Alpaugh	871	33	1.9
Ponderosa Basin Mutual WTR Co	Mariposa	798	46	2.7
Meadowcreek Mutual Water Company	Bishop	764	57	3.3
Pacific Union College	Angwin	758	34	2
Tahoe Park Water Company	Eldorado Hills	750	42	2.5
Graeagle Water Company	Graeagle	737	42	2.4
City of Etna	Etna	720	33	1.9
Mc Clellan MHP	North Highlands	700	27	1.6
Moon Valley Water System	Sonoma	691	33	1.9
Cal Am - Walnut Grove	Sacramento	667	23	1.4

Source: California State Water Resources Control Board, Division of Drinking Water, 2,449 utilities, results from Jan. 2, 2019 to July 14, 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: 7 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.

1 to 100 of 325, by people served

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