California utilities 501 to 600.

Each serves 4,910 to 7,705 people, as it reports to EPA. Your ZIP code finds yours faster.

Find a California utility, city or county

501 to 600 of 720, by people served

California utilities, 501 to 600 of 720, by people served
Utility	Based in	Serves	Regulated PFAS	Health-based violations since 2016
Western Heights Water Company	Yucaipa	7,705	None found	0
Earlimart PUD	Earlimart	7,679	None found	1
Oceano Comm Services Dist.	Oceano	7,601	None found	0
City of Sebastopol	Sebastopol	7,522	None found	0
Castroville Community Services District	Castroville	7,515	None found	0
Folsom State Prison	Represa	7,502	PFOS	1
City of Hughson	Hughson	7,481	None found	38
City of Dos Palos	Dos Palos	7,452	None found	30
City of Fowler	Fowler	7,448	None found	0
City of Escalon	Escalon	7,429	None found	0
Gswc - Calipatria	San Dimas	7,363	None found	0
San Gabriel Valley Water Co - Montebello 2	Montebello	7,330	None found	0
Vandenberg Village Comm. Serv. Dist.	Lompoc	7,308	None found	0
City of Cotati	Cotati	7,303	None found	0
City of Gridley	Gridley	7,269	PFOS, PFHxS, PFNA	1
Cal - Water Service Co. - Willows	San Jose	7,240	None found	0
Awa, Ione	Jackson	7,227	None found	2
City of Winters	Winters	7,115	PFNA	0
Los Osos Community Services District	Los Osos	7,086	PFOA, PFOS, PFHxS, PFBS	0
Lake Arrowhead CSD	Lake Arrowhead	7,038	PFOA, PFOS, PFHxS, PFNA	0
Santa Ynez River Water Cons. Dist. Id#1	Santa Ynez	7,022	None found	0
Rincon Northern	Valley Center	7,003	PFOA, PFOS, PFBS	0
Peter Pitchess Honor Rancho Detn. Ctr	Castaic	7,000	PFOA, PFOS, PFHxS	0
Golden State WC - Cowan Heights	Anaheim	6,997	None found	0
Heber Public Utility District	Heber	6,979	None found	7
City of Fort Bragg	Fort Bragg	6,919	None found	1
Nevada ID - Lake of Pines	Grass Valley	6,870	None found	0
Nevada ID - North Auburn	Grass Valley	6,870	None found	0
Ojai Water System	Oak View	6,801	None found	0
Beale Air Force Base	Beale AFB	6,785	None found	1
Foresthill Public Utility Dist	Foresthill	6,782	None found	0
Nuevo Water Company	Nuevo	6,733	PFOA, PFOS, PFHxS	5
Joshua Basin Water District	Joshua Tree	6,640	None found	0
China Lake Naval Air Weapons Station	China Lake	6,600	None found	0
Psmcsd - Pajaro	Royal Oaks	6,500	None found	0
Madera Valley Water Company	Madera	6,494	None found	0
City of Colusa	Colusa	6,447	None found	0
Los Angeles Cwwd 36 - Val Verde	Alhambra	6,376	None found	0
City of Holtville	Holtville	6,355	None found	5
Maywood Mutual Water Co. #2	Maywood	6,349	PFOS	0
Helendale Community Service District	Helendale	6,347	PFOA, PFOS, PFHxS, PFBS	0
North Tahoe PUD - Main	Tahoe Vista	6,321	None found	0
Calaveras PUD	San Andreas	6,286	None found	0
Purissima Hills Water District	Los Altos Hills	6,245	None found	0
Hidden Valley Lake CSD	Hidden Valley Lake	6,235	None found	0
Golden State Water Co - Apple Vly South	Apple Valley	6,208	None found	0
Cutler PUD	Cutler	6,200	None found	5
City of Willits	Willits	6,175	None found	0
City of Industry Waterworks Systems	La Puente	6,158	None found	0
Solvang Water Division	Solvang	6,126	PFBS	0
City of Gustine	Gustine	6,110	None found	1
Ventura River Water District	Ojai	6,100	None found	3
Montara Water and Sanitary District	Montara	6,078	None found	0
Maywood Mutual Water Co. #3	Maywood	6,059	PFOA, PFOS, PFHxS	0
Lake Almanor Country Club MWC	Lake Almanor	6,000	None found	1
Sweetwater Springs CWD - Guerneville	Guerneville	6,000	None found	0
Bellflower Municipal Water System	Rosemead	5,999	PFOA, PFOS, PFHxS	0
Malaga County Water District	Fresno	5,979	None found	0
Konocti County Water District	Clearlake	5,928	None found	0
Golden State Water Company - Los Osos	Hawthorne	5,924	PFHxS, PFBS	0
Glen Helen Water System	San Bernardino	5,900	PFHxS, PFBS	0
Santa Ana River Water Company	Jurupa Valley	5,848	None found	0
San Joaquin County - Lincoln Village	Stockton	5,841	None found	0
Rancho Murieta Community Servi	Rancho Murieta	5,728	None found	1
Naval Base Ventura County, Point Mugu	Point Mugu	5,700	Not sampled	1
Pauma	Pauma Valley	5,700	None found	0
Keyes Community Services Dist.	Keyes	5,672	None found	17
Tahoe City PUD - Main	Tahoe City	5,661	None found	0
Serrano Water District	Villa Park	5,659	None found	0
Golden State Water Co - Arden Water Serv	Rancho Cordova	5,658	None found	0
Cal Am - Meadowbrook	Sacramento	5,656	PFOS	0
City of Calistoga	Calistoga	5,610	PFOA, PFOS	8
Bear Valley CSD	Tehachapi	5,592	PFOA	1
Cdcr California Health Care Facility	Stockton	5,551	Not sampled	3
City of Williams	Williams	5,538	None found	0
Cambria Comm Services Dist	Cambria	5,532	None found	2
Palm Ranch Irrigation Dist.	Quartz Hill	5,507	None found	0
Riverstone/Rootcreek Water District	Madera	5,507	Not sampled	1
Hilmar County Water District	Hilmar	5,504	None found	14
Maywood Mutual Water Co. #1	Huntington Park	5,500	PFOS	0
Millview County Water District	Ukiah	5,500	None found	0
Tud - Columbia Water System	Sonora	5,463	None found	0
City of St. Helena	St. Helena	5,386	None found	11
La Habra Heights CWD	La Habra Heights	5,325	PFOA, PFOS, PFHxS, PFBS	0
Yosemite Spring Park Util Co	Coarsegold	5,300	PFOA, PFOS, PFHxS, PFBS	13
Cwsc Salinas Hills	San Jose	5,293	None found	0
Running Springs Water District	Running Springs	5,268	PFOA, PFOS, PFHxS, PFBS	0
Suburban Water Systems - Glendora	Covina	5,249	None found	0
Redwood Valley County Water District	Ukiah	5,200	None found	0
Ccwd - Copper Cove	San Andreas	5,187	None found	0
City of Buellton Water Division	Buellton	5,161	None found	0
Wasco St. Prison Reception Ctr	Wasco	5,124	None found	0
California State Prison - Solano	Vacaville	5,100	None found	1
Denair Community Services District	Denair	5,090	None found	0
City of Jackson	Jackson	5,019	None found	1
Kern Valley State Prison	Delano	5,000	None found	0
Pleasant Valley Mutual Water Co	Camarillo	5,000	PFOA, PFOS, PFHxS	0
City of Grass Valley	Grass Valley	4,947	None found	0
Awa, Tanner	Sutter Creek	4,940	None found	0
Stallion Springs CSD	Tehachapi	4,910	None found	0

Utilities EPA sampled under UCMR 5, plus any other community system serving 3,300 people or more. Smaller systems appear in ZIP code results. People served is what each utility reports to EPA. Data: EPA SDWIS 2026 Q2 and UCMR 5.

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California utilities 501 to 600.

501 to 600 of 720, by people served

Where to go next

Read your utility’s own report

Every contaminant

Filters, checked