What does 'people served' mean?

People served refers to the total population that receives water service from the utility. This number represents the estimated number of residents within the utility's service area.

Why are utilities listed by city?

Utilities are listed by their primary city of operation to help users find water services in their local area. Some utilities may serve multiple cities or unincorporated areas within a region.

How can I get more details about a utility?

Click on any utility name or the 'View Profile' button to access the full utility profile page, which includes detailed information, contact details, and compliance data.

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Drinking Water Utilities in California

Q: How many drinking water utilities are in California?

California has 462 drinking water utilities serving more than 10,000 people listed in this directory.

Browse utilities serving more than 10,000 people by location and population served.

Utilities listed

462

Total people served

65,948,835

Largest utility

Metropolitan Water District of So. Cal.

18,606,473 people

Coverage

100%

with population data

California has 462 drinking water utilities serving more than 10,000 people in this directory. The largest utility by population served is Metropolitan Water District of So. Cal., serving 18,606,473 people. Utilities are listed with their city location and population served.

People Served:

018,606,473

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Utility Name	City	People Served	Action
Metropolitan Water District of So. Cal.	La Verne	18,606,473	View Profile
Los Angeles Department of Water and Power	Los Angeles	3,868,811	View Profile
San Diego County Water Authority	San Diego	3,276,208	View Profile
Santa Clara Valley Water District	San Jose	1,934,171	View Profile
East Bay Municipal Utility District	Oakland	1,430,200	View Profile
City of San Diego	San Diego	1,374,790	View Profile
San Jose Water Company	San Jose	1,007,514	View Profile
San Francisco City Water System	Burlingame	800,000	View Profile
Central Coast Water Authority	Buellton	646,441	View Profile
Calleguas Municipal Water District	Thousand Oaks	640,000	View Profile
Eastern Municipal Water District	Perris	637,387	View Profile
City of Fresno	Fresno	545,466	View Profile
City of Sacramento Main	Sacramento	520,746	View Profile
Irvine Ranch Water District	Irvine	468,941	View Profile
Long Beach UtilitiesDepartment	Long Beach	460,682	View Profile
Chino Basin Desalter Authority - Desalter 2	Ontario	376,341	View Profile
Covina Irrigating Company	Covina	369,059	View Profile
Stockton East Water District	Stockton	364,624	View Profile
Alameda County Water District	Fremont	344,855	View Profile
City of Anaheim	Anaheim	341,245	View Profile
City of Santa Ana	Santa Ana	337,716	View Profile
Mojave Water Agency	Apple Valley	316,866	View Profile
City of Riverside	Riverside	300,488	View Profile
Santa Clarita Valley W.a.-imported Divis	Newhall	294,639	View Profile
California Domestic Water Company	Whittier	290,814	View Profile
Antelope Valley - East Kern Water Agency	Palmdale	286,142	View Profile
Helix Water District	Lakeside	277,418	View Profile
Golden State Water Company (GSWC) - Southwest	Hawthorne	275,369	View Profile
Coachella Valley Water District: Cove Community	Palm Desert	270,000	View Profile
California Water Service (CWS) - Bakersfield	San Jose	266,213	View Profile
San Gabriel Valley Water Company- El Monte	El Monte	254,300	View Profile
United Water Cons District	Oxnard	240,000	View Profile
San Gabriel Valley Water Company - Fontana	El Monte	237,300	View Profile
Otay Water District	Spring Valley	227,957	View Profile
Modesto Irrigation District	Modesto	218,790	View Profile
City of Modesto	Modesto	218,771	View Profile
South San Joaquin Irrigation District	Ripon	212,000	View Profile
San Bernardino City	San Bernardino	204,870	View Profile
Los Angeles County WW District 4 & 34-Lancaster	Alhambra	204,393	View Profile
Cucamonga Valley Water District	Rancho Cucamonga	202,248	View Profile
Glendale Water Department	Glendale	201,334	View Profile
City of Huntington Beach	Huntington Beach	201,000	View Profile
Oxnard Water Department	Oxnard	200,232	View Profile
Contra Costa Water District	Concord	198,000	View Profile
Sacramento Suburban Water District	Sacramento	194,444	View Profile
Marin Municipal Water District	Corte Madera	193,937	View Profile
Sweetwater Authority	Chula Vista	189,371	View Profile
Ontario Municipal Utilities Company	Ontario	185,010	View Profile
Kern County Water Agency	Bakersfield	185,000	View Profile
City of Stockton	Stockton	183,046	View Profile

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Top Drinking Water Utilities in California by Population Served

Frequently Asked Questions

Definitions

People served: Total population supplied with water by the utility system.
Drinking water utility: A public water system that provides potable (safe to drink) water to residential and commercial customers through a distribution network.