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.

201 to 300 of 759, by people served

California utilities whose water varies in hardness, 201 to 300, 201 to 300
Utility	Based in	Serves	Hardness, mg/L	Grains per gallon
Coastside County Water District	Half Moon Bay	19,033	32 to 197	1.9 to 11.5
Bella Vista Water District	Redding	18,767	45 to 71	2.6 to 4.2
California Water Service Co. - Travis AFB	San Jose	18,111	170 to 210	9.9 to 12.3
City of Arroyo Grande Utilities Division	Arroyo Grande	17,963	8 to 505	0.5 to 29.5
Western MWD - Murrieta Division	Riverside	17,837	54 to 270	3.2 to 15.8
Bakman Water Company	Fresno	17,393	82 to 440	4.8 to 25.7
City of Kerman	Kerman	17,256	19 to 112	1.1 to 6.5
Orange Vale Water Company	Orangevale	16,861	23 to 110	1.3 to 6.4
Town of Discovery Bay	Discovery Bay	16,790	144 to 288	8.4 to 16.8
Pinedale County Water District	Pinedale	16,736	40 to 90	2.3 to 5.3
Olivehurst Public Utility District	Olivehurst	16,595	89 to 238	5.2 to 13.9
Cal Am - Fruitridge Vista	Sacramento	16,075	100 to 335	5.8 to 19.6
City of Ukiah	Ukiah	16,067	91 to 159	5.3 to 9.3
City of Ripon	Ripon	15,753	83 to 290	4.8 to 17
Rio Linda/Elverta Community Water Dist	Rio Linda	15,460	62 to 140	3.6 to 8.2
South Montebello Irrigation Dist.	Montebello	15,021	122 to 227	7.1 to 13.3
Sbdno County Service Area 64	San Bernardino	14,955	76 to 130	4.4 to 7.6
City of Livingston	Livingston	14,894	47 to 155	2.7 to 9.1
City of Modesto - Salida	Modesto	14,576	71 to 188	4.1 to 11
City of Parlier	Parlier	14,576	41 to 90	2.4 to 5.3
City of McFarland	McFarland	14,161	11 to 66	0.7 to 3.9
Chowchilla City Water Dept	Chowchilla	13,916	49 to 190	2.8 to 11.1
City of Kingsburg	Kingsburg	13,540	57 to 220	3.3 to 12.9
Tud - Upper Basin Water System	Sonora	13,331	9.8 to 120	0.6 to 7
Uc - Davis	Davis	13,177	76 to 140	4.4 to 8.2
Cal - Water Service Co. - Marysville	San Jose	12,888	160 to 338	9.4 to 19.7
Big Bear City CSD	Big Bear City	12,738	73 to 490	4.3 to 28.7
City of Lindsay	Lindsay	12,659	8.7 to 835	0.5 to 48.8
City of Mendota	Mendota	12,595	5.3 to 300	0.3 to 17.5
Los Angeles Cwwd 40, Reg. 38 - Lake la	Alhambra	12,582	94 to 150	5.5 to 8.8
City of Dixon	Dixon	12,540	125 to 280	7.3 to 16.4
Thermalito Water & Sewer Dist	Oroville	12,209	36 to 117	2.1 to 6.8
City of Fortuna	Fortuna	12,133	117 to 205	6.8 to 12
Signal Hill - City, Water Dept.	Signal Hill	11,848	80 to 235	4.7 to 13.7
Crestline Village CWD - Division 10	Crestline	11,650	58 to 150	3.4 to 8.8
Los Angeles Cwwd 40, R 24,27,33 - Pearblsm	Alhambra	11,609	115 to 249	6.7 to 14.6
Greenfield County WD	Bakersfield	11,590	53 to 170	3.1 to 9.9
Camp Pendleton (North)	Camp Pendleton	11,576	110 to 275	6.4 to 16.1
City of Anderson	Anderson	11,323	53 to 104	3.1 to 6.1
City of Rio Vista	Rio Vista	11,206	24 to 122	1.4 to 7.1
Scotts Valley Water District	Scotts Valley	11,197	121 to 317	7.1 to 18.6
City of Exeter	Exeter	11,169	110 to 305	6.4 to 17.8
Tud - Sonora/Jamestown Water System	Sonora	11,113	14 to 220	0.8 to 12.9
Cal - Water Service Co. - Oroville	San Jose	11,047	37 to 145	2.2 to 8.5
Sierra Madre - City, Water Dept.	Sierra Madre	11,000	158 to 229	9.2 to 13.4
City of Healdsburg	Healdsburg	10,972	78 to 213	4.6 to 12.4
California Institution for Men	Chino	10,667	120 to 340	7 to 19.9
California Water Service Co. - Dixon	San Jose	10,623	110 to 460	6.4 to 26.9
City of Sonoma	Sonoma	10,619	15 to 64	0.9 to 3.8
South Mesa WC	Calimesa	10,348	18 to 210	1.1 to 12.3
Riverstone/Rootcreek Water District	Madera	10,276	63 to 295	3.7 to 17.3
City of Farmersville	Farmersville	10,243	51 to 85	3 to 5
SCWA - Arden Park Vista	Sacramento	10,068	35 to 220	2 to 12.9
Cal - Am Water Company - East Pasadena	Rosemead	9,963	120 to 130	7 to 7.6
Golden Hills CSD	Tehachapi	9,857	160 to 430	9.4 to 25.1
Winton Water & Sanitary Dist	Winton	9,745	52 to 87	3 to 5.1
City of Live Oak	Live Oak	9,687	74 to 274	4.3 to 16
Myoma Dunes Mutual Water Company	Bermuda Dunes	9,445	97 to 130	5.7 to 7.6
Paradise Irrigation District	Paradise	9,114	31 to 77	1.8 to 4.5
City of Tehachapi	Tehachapi	9,094	110 to 225	6.4 to 13.2
Clear Creek CSD - Anderson	Anderson	8,900	60 to 66	3.5 to 3.8
City of Waterford	Modesto	8,788	107 to 207	6.3 to 12.1
Firebaugh City	Firebaugh	8,424	70 to 255	4.1 to 14.9
City of Gonzales	Gonzales	8,333	166 to 325	9.7 to 19
Orosi Public Utility District	Orosi	8,300	125 to 190	7.3 to 11.1
City of Orland	Orland	8,298	158 to 233	9.2 to 13.6
City of Corning	Corning	8,244	107 to 163	6.3 to 9.5
Mammoth CWD	Mammoth Lakes	8,234	18 to 205	1.1 to 12
Templeton CSD	Templeton	8,041	90 to 658	5.3 to 38.5
City of Hughson	Hughson	7,977	50 to 177	2.9 to 10.4
City of Woodlake	Woodlake	7,918	53 to 160	3.1 to 9.4
California - American Larkfield (Puc)	Sacramento	7,911	100 to 160	5.8 to 9.4
City of Yreka	Yreka	7,879	65 to 292	3.8 to 17.1
Florin County Water District	Sacramento	7,831	63 to 160	3.7 to 9.4
US Army Fort Irwin	Fort Irwin	7,800	23 to 220	1.3 to 12.9
Delhi CWD	Delhi	7,784	43 to 157	2.5 to 9.2
Western Heights Water Company	Yucaipa	7,735	155 to 230	9.1 to 13.5
City of Sebastopol	Sebastopol	7,522	101 to 160	5.9 to 9.4
Castroville Community Services District	Castroville	7,515	24 to 565	1.4 to 33
City of Fowler	Fowler	7,448	29 to 100	1.7 to 5.8
City of Cotati	Cotati	7,290	98 to 215	5.7 to 12.6
City of Gridley	Gridley	7,269	105 to 215	6.1 to 12.6
City of Escalon	Escalon	7,232	59 to 133	3.4 to 7.8
City of Winters	Winters	7,115	170 to 350	9.9 to 20.5
Cal - Water Service Co. - Willows	San Jose	7,107	145 to 220	8.5 to 12.9
Los Osos Community Services District	Los Osos	7,086	59 to 331	3.5 to 19.4
Lake Arrowhead CSD	Lake Arrowhead	7,038	65 to 205	3.8 to 12
Santa Ynez River Water Cons. Dist. Id#1	Santa Ynez	7,022	150 to 490	8.8 to 28.7
Foresthill Public Utility Dist	Foresthill	6,811	32 to 73	1.9 to 4.3
City of Colusa	Colusa	6,675	55 to 98	3.2 to 5.8
Rubio Canon Land & Water Association	Altadena	6,646	135 to 390	7.9 to 22.8
Madera Valley Water Company	Madera	6,524	56 to 61	3.3 to 3.6
Joshua Basin Water District	Joshua Tree	6,489	41 to 97	2.4 to 5.7
Maywood Mutual Water Co. #2	Maywood	6,349	180 to 190	10.5 to 11.1
Helendale Community Service District	Helendale	6,347	39 to 430	2.3 to 25.1
North Tahoe PUD - Main	Tahoe Vista	6,321	32 to 80	1.9 to 4.6
Golden State Water Co - Apple Vly South	Apple Valley	6,247	70 to 220	4.1 to 12.9
Cutler PUD	Cutler	6,200	160 to 260	9.4 to 15.2
City of Willits	Willits	6,175	70 to 225	4.1 to 13.1
Montara Water and Sanitary District	Montara	6,088	55 to 240	3.2 to 14

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.

201 to 300 of 759, by people served

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