California utilities 1,301 to 1,400.

Each serves 270 to 330 people, as it reports to EPA. Your ZIP code finds yours faster.

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1,301 to 1,400 of 2,762, by people served

California utilities, 1,301 to 1,400 of 2,762, by people served
Utility	Based in	Serves	Regulated PFAS	Health-based violations since 2016
Trinity Village Mutual Water	Salyer	330	Not sampled	1
Washington Water District	Washington	330	Not sampled	1
Orick C.S.D.	Orick	328	Not sampled	0
Lincoln Grove Estates	Oroville	327	Not sampled	1
Sonoma County CSA 41 - Salmon Creek	Santa Rosa	327	Not sampled	0
Bel Air Mobile Estate	Stockton	325	Not sampled	0
Desert Springs MWC	Lucerne Valley	325	Not sampled	0
El Capitan Mutual Water Company	Goleta	325	Not sampled	1
Leisure Lake Mobile Estates	Chandler	325	Not sampled	0
Woodstock Ranch	Santa Ynez	325	Not sampled	0
Sierra Water Resources - Sierra City	Claremont	324	Not sampled	0
Siete Robles Mutual Water Co	Ojai	323	Not sampled	1
Double L Mobile Estates	Lockeford	320	Not sampled	0
Palmer Creek CSD	Fortuna	320	Not sampled	1
Saint Marie Mobile Home Park	Irvine	320	Not sampled	3
Santos Ranch PWS #5 - CSA #35	Stockton	320	Not sampled	0
El Dorado Mobile Home Park	Laguna Hills	318	Not sampled	0
Live Oak Springs Water System	Spring Valley	317	Not sampled	0
Twin Valley Inc	Castroville	317	Not sampled	54
Cascade Estates	Larkspur	316	Not sampled	0
Mill Creek Msc	Mentone	315	Not sampled	0
San Lucas County Water District	San Lucas	315	Not sampled	6
Stockdale Ranchos Mutual Water Co	Bakersfield	313	Not sampled	0
Owens Valley Water Resources, Inc.	Claremont	311	Not sampled	0
June Lake PUD - Down Canyon	June Lake	310	Not sampled	3
Lower Rock Creek Mutual Water Co.	Bishop	310	Not sampled	1
Pine Mountain Mutual Water Co.	Willits	310	Not sampled	0
San Joaquin Water Works #2	Stockton	310	Not sampled	0
Siskiyou Lake Highlands MWC	MT. Shasta	310	Not sampled	1
New Avenue Mutual Water Company	Gilroy	305	Not sampled	0
River Ranch Mobile Home Park	Concord	305	Not sampled	1
Santa Ynez Rancho Estates	Santa Ynez	304	Not sampled	0
Apple Valley View MWC	Apple Valley	303	Not sampled	6
Rand Communities Water District	Johanesburg	303	Not sampled	30
Easton Estates Water Company	Fresno	302	Not sampled	0
Tahoe City PUD - Timberland	Tahoe City	301	Not sampled	0
Barrett Lake Mh and Rv LLC	Santee	300	Not sampled	4
Big Pine Tract	Yucaipa	300	Not sampled	0
Branger Mutual Water Company, Inc.	Santa Rosa	300	Not sampled	2
County Service Area 7	Redwood City	300	Not sampled	6
Creekside Village	Penn Valley	300	Not sampled	0
CSA 70 - F Morongo	San Bernardino	300	Not sampled	42
East Walnut Grove [sws]	Sacramento	300	Not sampled	1
Glenhaven Mutual Water Company	Glenhaven	300	Not sampled	0
Heavenly Oaks	Santee	300	Not sampled	0
Holland Heights Mutual Water Company	Santa Rosa	300	Not sampled	0
Lupin Lodge	Los Gatos	300	Not sampled	3
MD 46 Ahwahnee Resorts	Madera	300	Not sampled	5
MD 63 Meadow Springs Ranch	Madera	300	Not sampled	0
Mel Mar Mutual Water Co	Palo Cedro	300	Not sampled	1
Morehead Park	Greenbrae	300	Not sampled	0
MT. Pleasant Water Users Association	San Jose	300	Not sampled	0
Okieville Highland Acres MWC	Tulare	300	Not sampled	1
Palomino Lakes Mutual Water Co.	Cloverdale	300	Not sampled	0
Riverdale Estates	Irvine	300	Not sampled	0
Sahara Mobile Court	Pleasanton	300	Not sampled	0
Siskiyou Co. Rolling Hills MWC	Yreka	300	Not sampled	0
Talmont Resort Improvement District	Tahoe City	300	Not sampled	0
Usmc/Mtn Warfare Trng Ctr - Bridgeport	Bridgeport	300	Not sampled	0
Woodward Bluffs MHP	Fresno	300	Not sampled	0
Hope Foundation/Moriah Heights	Plymouth	299	Not sampled	0
San Pasqual Academy	Spring Valley	298	Not sampled	0
Del Oro WC - Country Estates Dist	Chico	297	Not sampled	0
Lake Madrone Water District	Berry Creek	297	Not sampled	0
Rancho Calimesa Mobile Home Park	Calimesa	296	Not sampled	0
Skyline Park	Santa Ynez	295	Not sampled	0
Mariposa Pines Mutual	Mariposa	294	Not sampled	1
North Peak Mutual Water Company	Julian	294	Not sampled	0
Fcwwd 42/alluvial & Fancher	Fresno	291	Not sampled	1
Rancheritos #2	Apple Valley	291	Not sampled	0
Auburn Valley Community Service Dis	Auburn	290	Not sampled	0
Downieville Public U.D.	Downieville	290	Not sampled	1
Gill Creek Mutual Water Company	Geyserville	290	Not sampled	0
Gran Mutual Water Co	Chico	290	Not sampled	0
Morada Estates PWS	Stockton	290	Not sampled	0
Rancho del Campo Water System	Spring Valley	290	Not sampled	0
Sid - Elmira	Vacaville	290	Not sampled	0
Grenada Sanitary District	Grenada	289	Not sampled	1
Belmont Terrace Mutual Water Company	Sebastopol	287	Not sampled	0
Oid #51 - Sunset Oaks #10	Oakdale	287	Not sampled	0
Lake Siskiyou M.W.C.	MT. Shasta	281	Not sampled	3
Town of Sunol - SFPUC	Burlingame	281	Not sampled	0
Dolphin Isle Marina	Fort Bragg	280	Not sampled	0
Greenhorn Creek CSD	Portola	280	Not sampled	0
Hornbrook C.S.D.	Hornbrook	280	Not sampled	5
Imperial Manor Mobilehome Community	Vacaville	280	Not sampled	0
Peppermint Creek MHP	Stockton	280	Not sampled	3
Woodside Rv Park	Fort Bragg	280	Not sampled	1
Badger Hill Estates	Exeter	278	Not sampled	0
Del Oro WC - Black Butte District	Chico	277	Not sampled	0
Prunedale MWC	Salinas	277	Not sampled	2
Golden Feather MHP	Sacramento	275	Not sampled	0
Mapache Trailer Park	Concord	275	Not sampled	0
Willow Springs Mobile Home Park	Tehachapi	275	Not sampled	0
Shasta CSA - Sugarloaf, #2	Redding	274	Not sampled	1
Pedrazzi MWC	Salinas	273	Not sampled	0
Riverkern Mutual Water Company	Kernville	272	Not sampled	0
Enos Lane Public Utility District	Bakersfield	270	Not sampled	2
Farmington Water Company	Farmington	270	Not sampled	0
North Muroc Mutual Water Company	North Edwards	270	Not sampled	0

Every utility EPA sampled for PFAS under UCMR 5, any other community system serving 3,300 people or more, and any smaller one with results from 2020 on, from the state. Other systems appear in ZIP code results. People served is what each utility reports to EPA. Data: EPA SDWIS 2026 Q3, UCMR 5 and EPA’s 2012 to 2019 compliance results, and California State Water Resources Control Board, Division of Drinking Water.

1,301 to 1,400 of 2,762, by people served

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