California utilities with moderately hard water.

61 to 120 mg/L (3.6 to 7 grains per gallon). 414 utilities serving 465,877 people as they report it, largest first.

101 to 200 of 414, by people served

California utilities with moderately hard water, 101 to 200, 101 to 200
Utility	Based in	Serves	Hardness, mg/L	Grains per gallon
Stockdale Ranchos Mutual Water Co	Bakersfield	313	93	5.4
Apple Valley View MWC	Apple Valley	303	115	6.7
Tahoe City PUD - Timberland	Tahoe City	301	84	4.9
MD 46 Ahwahnee Resorts	Madera	300	78	4.5
Riverdale Estates	Irvine	300	105	6.1
Talmont Resort Improvement District	Tahoe City	300	87	5.1
Rancheritos #2	Apple Valley	291	98	5.7
Downieville Public U.D.	Downieville	290	99	5.8
Gran Mutual Water Co	Chico	290	109	6.4
Dolphin Isle Marina	Fort Bragg	280	105	6.1
Imperial Manor Mobilehome Community	Vacaville	280	86	5
Peppermint Creek MHP	Stockton	280	63	3.7
Woodside Rv Park	Fort Bragg	280	75	4.4
Golden Feather MHP	Sacramento	275	104	6.1
Riverkern Mutual Water Company	Kernville	272	93	5.5
Farmington Water Company	Farmington	270	68	4
Clements Water Works #43	Stockton	264	96	5.6
Riverland Mobilehome Park	Stockton	260	97	5.7
Saratoga Heights Mutual Water Company	Saratoga	258	109	6.4
Bass Lake Heights Mutual Water	Oakhurst	250	65	3.8
East Acres Mutual Water Company	Firebaugh	250	75	4.4
Lake Jodie Water System	West Hollyhood	250	86	5
Lazy Landing Mobile Home Park	Redding	250	101	5.9
River Estates Mutual Water Company	Ukiah	250	98	5.7
Del Oro California Pines District	Chico	249	83	4.9
Fcsa 30 - El Porvenir	Fresno	241	97	5.7
Starlite Community Service District	Bishop	241	68	4
Ballico CSD	Ballico	238	110	6.4
Shaded Terrace PWS	Stockton	238	81	4.7
Murrieta Palms Mobile Home Park	Hemet	237	90	5.3
Paskenta Comm. Services Dist.	Paskenta	237	104	6.1
Pinyon Pines County Water Dist	Mountain Center	232	98	5.7
Acampo Water System	Stockton	231	84	4.9
Panoche Water District	Firebaugh	225	97	5.7
San Luis Hills	Los Banos	221	80	4.7
Pond - Derosa Oaks WC	Fremont	216	92	5.4
Del Oro Water Co. - Hat Creek District	Chico	211	63	3.7
Camino Mobilehome	Oakley	210	93	5.4
Moro Rd WS #09	Salinas	210	107	6.3
Elk County Water District	Elk	207	105	6.1
Ivcsd Crescent Mills	Greenville	206	115	6.7
Camanche North Shore Inc.	Valley Springs	205	91	5.3
Casa de Amigos Manufactured Housing Comm	Stockton	204	84	4.9
Anza Rv Resort	Escondido	203	100	5.8
El Dorado West MHP	Laguna Hills	203	83	4.8
Castlewood Mobile Home Park	Marysville	200	100	5.8
Lake Hemet MWD - Camp Ground	Hemet	200	110	6.4
Lundy Mutual Water Company	Bishop	200	72	4.2
Manon Manor Mutual Water Company	Bakersfield	200	107	6.2
Sierraville P.U.D.	Sierraville	200	88	5.1
Stockdale Mutual Water Co.	Bakersfield	200	89	5.2
Villa Cerezos	Los Altos	200	80	4.7
Yulupa Mutual Water Company	Santa Rosa	200	83	4.9
China Lake Acres Mutual Water Company	Inyokern	198	115	6.7
Western Skies Mobile Home Park	Lancaster	198	81	4.7
Stonegate Mobile Home Park	Los Angeles	196	115	6.7
Allen Road Mutual Water System	Bakersfield	195	74	4.3
Timber Cove County Water District	Jenner	190	90	5.2
Carmet by the Sea Water Company	Bodega Bay	188	120	7
Park West Mutual Water Company	Bishop	188	80	4.7
Elk Creek Community S.D.	Elk Creek	184	117	6.8
Woodridge Mutual Water Co	Shingletown	176	110	6.4
Antelope Creek MHP	Los Moliinos	175	87	5.1
Amezcua - Garcia Water	Thermal	170	82	4.8
Oakley Mutual Water Company	Oakley	170	100	5.8
Psmcsd - Vierra Estates WS	Royal Oaks	164	102	5.9
Hartland Christian Camp	Badger	163	68	4
Surrey Village Water Co. Inc.	Red Bluff	163	83	4.8
Comunidad Nuevo Lago, Inc	Turlock	160	100	5.8
Kings Park Apartments	Sanger	160	76	4.4
Olympic Valley MWC	Reno	151	72	4.2
Castle Airport	Merced	150	69	4
Elkins Ranch	Fillmore	150	100	5.8
Fairway Mutual Water Co	Kingsburg	150	71	4.2
Foster Road Mutual Water Company	Santa Maria	150	100	5.8
MD 40 Sunset Ridge Estates	Madera	150	100	5.8
MD 60 Dillon Estates	Madera	150	80	4.7
MD 95 Ranchos West	Madera	150	88	5.1
Oid #22 - Williams Tract	Oakdale	150	101	5.9
Palomar Mountain Mutual Water Co.	Bonita	150	76	4.4
Sunrise Estates Mutual Water Company	Jamul	150	74	4.3
White Mountain Mutual Water Company	Bishop	142	110	6.4
Harris Farms Headquarters	Coalinga	140	115	6.7
Susan River Park Water Co.	Westwood	140	97	5.6
Plainview MWC - Central Water	Strathmore	138	105	6.2
Trinity Knolls Mutual Water Company	Trinity Center	138	81	4.7
Kelly Mutual Water Company	Sebastopol	135	63	3.7
Valley View Trailer Park	Hopewell	135	77	4.5
Cartago Mutual Water Company	Bishop	132	70	4.1
Cassel Park Mutual Water Co	Cassel	131	104	6.1
Mountain Valley Apts & Rvp	Red Bluff	131	76	4.4
Treasure Creek Woods MWC	Trinty Center	131	79	4.6
Teen Challenge	Reedley	130	92	5.4
Yosemite Terrace Estates	Greeley Hill	130	110	6.4
Sierra Twain Harte MHP	Jamestown	129	111	6.5
Emigrant Gap Mutual Water Co.	Emigrant Gap	125	74	4.3
Creekside Cabins & Rv Resort	Henderson	124	98	5.7
Bethel Island Mutual Water Co	Bethel Island	123	101	5.9
Amberwood Estates, LLC	Stockton	120	80	4.7
Pesante Rd WS #02	Salinas	120	96	5.6

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.

101 to 200 of 414, by people served

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