California 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. 759 utilities serving 28 million people as they report it, largest first.

601 to 700 of 759, by people served

California utilities whose water varies in hardness, 601 to 700, 601 to 700
Utility	Based in	Serves	Hardness, mg/L	Grains per gallon
Rancho Carrillo MWC	Rancho Mission Viejo	210	140 to 423	8.2 to 24.7
Capell Valley Estates	Stockton	208	120 to 208	7 to 12.2
Golden State Water Co. - Robbins	Rancho Cordova	207	75 to 785	4.4 to 45.9
Orland Estates Mobile H.P.	Billings	207	131 to 183	7.7 to 10.7
Estero Mutual	Dillon Beach	206	51 to 97	3 to 5.7
Preserve at Millerton Lake Water System	Pismo Beach	204	51 to 113	3 to 6.6
Cws - Split Mountain Water System	San Jose	203	100 to 140	5.8 to 8.2
Alpine Springs County Water District	Alpine Meadows	200	40 to 74	2.3 to 4.3
El Adobe Poa, Inc.	Bakersfield	200	94 to 905	5.5 to 52.9
Holiday Mobile Village	Menlo Park	200	141 to 249	8.3 to 14.5
Improvement District No. 1	Three Rivers	200	30 to 217	1.8 to 12.7
Rancho Estates Mutual Water Co.	Pauma Valley	200	130 to 480	7.6 to 28.1
River Highlands CSD	Marysville	200	169 to 324	9.9 to 18.9
Sierra Linda Mutual Water Co	North Fork	200	66 to 150	3.9 to 8.8
Sierra Breeze Mutual Water Company	Inyokern	199	140 to 265	8.2 to 15.5
Alpine Village	Romoland	198	170 to 495	9.9 to 28.9
Colonial Oak WC Inc	Salinas	198	92 to 152	5.4 to 8.9
Fcwwd 40 - Shaver Springs	Fresno	196	110 to 130	6.4 to 7.6
Rolling Hills Rancho WA	Salinas	185	73 to 144	4.3 to 8.4
Sonoma Mountain County Water District	Santa Rosa	185	95 to 170	5.5 to 9.9
Foothill Estates WS	Salinas	183	180 to 205	10.5 to 12
Copco Lake MWC	Prescott	181	34 to 154	2 to 9
Camptonville Community Serv Dist	Camptonville	180	33 to 216	1.9 to 12.6
Foothills Manufactured Home Communuty	Oroville	180	22 to 62	1.3 to 3.6
Ortega Oaks Rv Park&Campground	Lake Forest	180	180 to 250	10.5 to 14.6
Western Mobile Home Park	Stockton	178	122 to 246	7.1 to 14.4
Porterville Developmental Center	Porterville	176	110 to 147	6.4 to 8.6
Sky Acres Mutual Water Corp	Oakhurst	175	43 to 167	2.5 to 9.8
Lands of Promise MWC	Rosamond	174	50 to 127	2.9 to 7.4
Rancho San Joaquin Water Sys	Stockton	172	97 to 329	5.7 to 19.2
Plaza Mobile Home Park	Stockton	169	118 to 226	6.9 to 13.2
Melody Woods Water Company	Los Gatos	168	135 to 237	7.9 to 13.8
IL Vineto	Hillsborough	160	72 to 280	4.2 to 16.4
Keefer Creek Estates	Chico	160	108 to 122	6.3 to 7.1
Lake Canyon Mutual Water Company	Los Gatos	156	180 to 240	10.5 to 14
Bedel Mutual Water Company	Visalia	155	58 to 95	3.4 to 5.6
Rough & Ready Village	Stockton	154	178 to 217	10.4 to 12.7
Cal Am Water Company - Garrapata	Pacific Grove	152	118 to 136	6.9 to 8
Sonoma Ranch Mutual Water Company	Hercules	151	45 to 78	2.6 to 4.6
Baker Ranch Water Corp	Foresthill	150	53 to 73	3.1 to 4.3
MD 24 Teaford Meadow Lakes	Madera	150	120 to 175	7 to 10.2
Reche Canyon Mutual Water Co.	Colton	150	84 to 195	4.9 to 11.4
Vieira'S Resort, Inc	Isleton	150	32 to 72	1.8 to 4.2
Fairway Estates PWS CSA - 18	Stockton	149	36 to 65	2.1 to 3.8
George Ranch Mutual Water Company	Hercules	148	84 to 135	4.9 to 7.9
Oid #45	Oakdale	144	60 to 189	3.5 to 11
Wynola Water District	San Ysabel	140	118 to 270	6.9 to 15.8
Gran Cielo Mutual Water Company	San Simeon	139	91 to 135	5.3 to 7.9
Cws - Mullen Water Company	San Jose	138	170 to 195	9.9 to 11.4
Harvest Moon Mutual Water Co	Bakersfield	138	110 to 135	6.4 to 7.9
Oakhurst Mobile Home Estates	Yorba Linda	138	160 to 190	9.4 to 11.1
Merrill Gardens Iris Canyon WS	Monterey	136	57 to 223	3.3 to 13
Oak Glen Domestic Water	Hemet	130	170 to 190	9.9 to 11.1
Skp Park of the Sierras Inc	Coarsegold	130	74 to 140	4.3 to 8.2
End - O - Valley Mutual Water Company	Santa Rosa	129	130 to 390	7.6 to 22.8
Bar - Len MWC	Barstow	126	155 to 225	9.1 to 13.2
Brookside Mobile Home Park	Costa Mesa	126	40 to 92	2.3 to 5.4
Fircrest Mutual Water Company	Sebastopol	126	109 to 145	6.4 to 8.5
Shadow Mountain MHP	San Juan Capistrano	126	70 to 200	4.1 to 11.7
Sierra King Homeowners Assn	Three Rivers	124	119 to 138	7 to 8.1
Meadow Lakes Club	Fresno	120	15 to 61	0.9 to 3.6
New Auberry Water Association	Auberry	120	109 to 158	6.4 to 9.2
Lazy H Mutual Water Company	Pauma Valley	117	180 to 240	10.5 to 14
Callender Grove Mutual Water	San Luis Obispo	116	67 to 235	3.9 to 13.7
Bobcat Springs Mutual Water Company	Buellton	115	80 to 500	4.7 to 29.2
Yosemite Forks Est Mutual	Oakhurst	110	55 to 83	3.2 to 4.9
Sunrise Mutual Water Co.	Visalia	109	58 to 77	3.4 to 4.5
Lake Henshaw Resort Inc.	Santa Ysabel	108	110 to 125	6.4 to 7.3
Gold Mountain CSD	Portola	106	32 to 100	1.9 to 5.8
Pinyon Crest HOA	Palm Desert	104	10 to 63	0.6 to 3.7
Volcano Community Service Dist	Volcano	103	69 to 181	4 to 10.6
Asoleado MWC	Carmel Valley	101	112 to 308	6.5 to 18
B & W Resort Marina	Isleton	100	46 to 99	2.7 to 5.8
Cherry Lane Trailer Park	Stockton	100	69 to 135	4 to 7.9
Ecco	Oakhurst	100	120 to 140	7 to 8.2
MD 42 Still Meadow	Madera	100	122 to 190	7.1 to 11.1
Meadow Estates Mutual	Boonville	100	41 to 163	2.4 to 9.5
North Trails Mutual Water Company	Agua Dulce	100	35 to 156	2 to 9.1
San Miguel WS #01	Royal Oaks	100	82 to 380	4.8 to 22.2
Sierra Park Water Company Inc.	MI - Wuk Village	100	111 to 128	6.5 to 7.5
Valley View Estates Mutual Water Co	Keene	97	135 to 200	7.9 to 11.7
Michele Mutual Water Company	Fulton	93	110 to 140	6.4 to 8.2
Hawkins Water Co - Cal Water Service (Puc)	San Jose	91	113 to 180	6.6 to 10.5
Anza Pines Mobile Home Park	Anza	90	144 to 260	8.4 to 15.2
Mettler County Water District	Bakersfield	90	79 to 175	4.6 to 10.2
Sonoma County CSA 41 - Freestone	Santa Rosa	90	60 to 160	3.5 to 9.4
Spring Canyon WA	Salinas	90	156 to 240	9.1 to 14
Hat Creek Highlands Mutual Water Co	Bella Vista, CA	88	48 to 62	2.8 to 3.6
Iverson & Jacks Apts WS	Salinas	86	108 to 520	6.3 to 30.4
Bassi Ranch Mutual Water Co.	Grover Beach	85	47 to 398	2.8 to 23.3
Valley Ford Water Association	Valley Ford	84	180 to 200	10.5 to 11.7
Bella Shores Mobile Home Park	Sacramento	80	57 to 147	3.3 to 8.6
California State Fair	Sacramento	80	36 to 155	2.1 to 9.1
Lancaster Water Company	Lancaster	80	119 to 133	7 to 7.8
Hills Ranch Mutual Water Company	Mendocino	79	53 to 271	3.1 to 15.8
Big Rise Village	Granite Bay	78	105 to 171	6.1 to 10
Shorelands Road & Water Company	Mendocino	78	42 to 87	2.5 to 5.1
Bodega Water Company	Bodega	77	10 to 110	0.6 to 6.4
Country Manor MHP	Valley Springs	75	42 to 75	2.5 to 4.4
Green Gulch Farm	Muir Beach	75	105 to 260	6.1 to 15.2

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.

601 to 700 of 759, by people served

Where to go next