California utilities 301 to 400.

Each serves 13,659 to 24,948 people, as it reports to EPA. Your ZIP code finds yours faster.

Find a California utility, city or county

301 to 400 of 720, by people served

California utilities, 301 to 400 of 720, by people served
Utility	Based in	Serves	Regulated PFAS	Health-based violations since 2016
City of Mountain House	Mountain House	24,948	None found	0
City of Seal Beach	Seal Beach	24,937	None found	0
City of Riverbank	Riverbank	24,834	None found	1
Cal - Am Water Company - Duarte	Rosemead	24,773	PFOS	0
Liberty Utilities - Lynwood	Downey	24,701	PFOA, PFOS, PFHxS	0
Phelan Pinon Hills CSD	Phelan	24,285	None found	0
San Fernando - City, Water Dept.	San Fernando	23,946	None found	0
Golden State Water Company - Bay Point	Rancho Cordova	23,731	None found	0
Rainbow Municipal WD	Fallbrook	23,536	None found	0
City of Oakdale	Oakdale	23,235	None found	1
Valley of the Moon Water District	El Verano	23,107	PFOA, PFOS, PFHxS, PFBS	0
El Monte - City, Water Dept.	El Monte	22,968	PFOS, PFHxS	0
City of Corcoran	Corcoran	22,808	None found	0
City of Millbrae	Millbrae	22,795	None found	0
Cws - North Garden	San Jose	22,762	PFOS	0
City of Wasco	Wasco	22,757	None found	0
South Feather W&P - Miners Ranch	Oroville	22,664	None found	0
Menlo Park Municipal Water	Menlo Park	22,362	None found	0
Pico WD	Pico Rivera	22,051	PFOA, PFOS, PFHxS, PFBS	0
Temescal Valley Water District	Temescal Valley	21,971	None found	0
City of Shafter	Shafter	21,915	None found	0
Linda County Water District	Marysville	21,654	None found	0
City of Imperial	Imperial	21,591	None found	8
Santa Fe I.D.	Rancho Santa Fe	21,578	None found	0
City of American Canyon	American Canyon	21,437	None found	9
Port Hueneme City Water Dept	Port Hueneme	21,407	None found	0
San Lorenzo Valley Water Dist	Boulder Creek	21,145	PFBS	1
City of Arcata	Arcata	20,875	None found	0
Cal/Am Water Company - Baldwin Hills	Rosemead	20,724	None found	0
West Kern Water District	Taft	20,500	None found	0
Norwalk - City, Water Dept.	Norwalk	20,283	PFOA, PFOS, PFHxS	0
Lomita - City, Water Dept.	Lomita	20,256	PFOS, PFHxS	1
Riverside Highland Water Company	Grand Terrace	20,188	PFOA, PFOS, PFHxS, PFBS	0
Humboldt C.S.D.	Cutten	19,807	None found	0
Arvin Community Services Dist	Arvin	19,669	None found	15
California Water Service Co - Westlake	San Jose	19,533	None found	0
City of Soledad	Soledad	19,455	None found	0
Santa Fe Springs - City, Water Dept.	Santa Fe Springs	19,219	PFOA, PFOS, PFBS	0
Quartz Hill Water Dist.	Quartz Hill	19,100	None found	0
Lamont Public Utility Dist	Lamont	19,057	None found	5
City of Greenfield	Greenfield	18,967	None found	0
City of San Jacinto	San Jacinto	18,950	None found	0
Coastside County Water District	Half Moon Bay	18,940	None found	0
Twentynine Palms Water District	Twentynine Palms	18,795	None found	0
Bella Vista Water District	Redding	18,612	None found	0
NPS Ggnra	Sausalito	18,447	None found	0
Laguna Beach County WD	Laguna Beach	18,404	None found	0
California Water Service Co. - Travis AFB	San Jose	18,111	None found	0
City of Arroyo Grande Utilities Division	Arroyo Grande	17,963	PFOA, PFOS, PFHxS, PFBS	0
Rosamond CSD	Rosamond	17,711	None found	0
Western MWD - Murrieta Division	Riverside	17,453	PFOA, PFOS, PFHxS	0
Bakman Water Company	Fresno	17,393	None found	1
Coalinga - City	Coalinga	17,277	None found	0
City of Crescent City	Crescent City	17,262	None found	0
City of Kerman	Kerman	17,256	None found	0
Nevada ID - E. George, Banner Mountain	Grass Valley	17,154	None found	0
McKinleyville C.S.D.	McKinleyville	16,900	None found	0
Orange Vale Water Company	Orangevale	16,861	None found	0
Town of Discovery Bay	Discovery Bay	16,790	None found	0
Pinedale County Water District	Pinedale	16,736	PFOA, PFOS, PFHxS, PFBS	0
City of Ukiah	Ukiah	16,607	PFOA, PFOS, PFHxS, PFBS	0
Olivehurst Public U.D.	Olivehurst	16,595	None found	0
El Segundo - City, Water Dept.	El Segundo	16,445	None found	0
Fillmore Water Dept	Fillmore	16,419	None found	0
City of Cupertino	Cupertino	16,336	None found	0
Cwsc King City	San Jose	16,334	None found	0
Nasa Ames Research Center	Moffett Field	16,273	None found	0
Walnut Park Mutual Water Co.	Huntington Park	16,180	None found	0
Lincoln Avenue Water Co.	Altadena	16,088	None found	0
USMC - 29 Palms	Twentynine Palms	16,067	None found	0
Morongo	Banning	16,000	None found	0
Carpinteria Valley Water District	Santa Barbara	15,996	None found	0
City of la Palma	La Palma	15,948	None found	0
City of Ripon	Ripon	15,741	PFOA, PFOS, PFHxS	0
US Army Fort Irwin	Fort Irwin	15,701	None found	4
Cal Am - Fruitridge Vista	Sacramento	15,652	None found	0
Rio Linda/Elverta Community Water Dist	Rio Linda	15,460	PFHxS	0
Northstar C.S.D.	Truckee	15,452	None found	0
Huntington Park - City, Water Dept.	Huntington Park	15,437	PFOA, PFOS, PFHxS	0
Loma Linda University	Loma Linda	15,368	PFOS, PFHxS	0
South Montebello Irrigation Dist.	Montebello	15,021	PFOA, PFOS, PFBS	0
California Mens Colony	San Luis Obispo	15,000	None found	0
Lemoore Naval Air Station	Lemoore	15,000	None found	2
American Water O&M, LLC - Vsfb	Vandenberg Sfb	14,971	None found	0
Sbdno County Service Area 64	San Bernardino	14,911	None found	0
City of Livingston	Livingston	14,894	None found	2
City of Red Bluff	Red Bluff	14,710	PFOA	0
City of Parlier	Parlier	14,576	None found	1
City of Modesto - Salida	Modesto	14,537	None found	0
Pala North	Pala	14,280	PFOA, PFBS	16
City of California City	California City	14,198	None found	0
City of McFarland	McFarland	14,161	None found	7
Nevada ID - Loma Rica	Grass Valley	14,072	None found	0
Tract 180 Mutual Water Co.	Cudahy	14,000	PFOA, PFOS, PFHxS	0
Chowchilla City Water Dept	Chowchilla	13,916	PFOA	0
Triunfo Water & Sanitation District	Westlake Village	13,898	None found	0
Nipomo Comm Services Dist	Nipomo	13,771	None found	0
Morro Bay Pw Dept - Water Division	Morro Bay	13,757	None found	0
City of Avenal	Avenal	13,696	None found	9
Trabuco Canyon Water District	Trabuco Canyon	13,659	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.