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Public water systems in California

523 public water systems in California, 2nd among the states. Community drinking-water systems owned by a local, state or federal government and serving 3,301 people or more, from EPA's Safe Drinking Water Information System. Private and tribal systems are not included.

Public water systemPopulation served
LOS ANGELES-CITY, DEPT. OF WATER & POWER3,875,566
EAST BAY MUD1,442,800
SAN DIEGO, CITY OF1,385,379
SFPUC CITY DISTRIBUTION DIVISION848,019
EASTERN MUNICIPAL WD666,581
CITY OF FRESNO545,716
CITY OF SACRAMENTO MAIN527,979
LONG BEACH UTILITIES DEPARTMENT466,772
IRVINE RANCH WATER DISTRICT444,800
CITY OF ANAHEIM348,593
ALAMEDA COUNTY WATER DISTRICT344,000
CITY OF SANTA ANA310,539
RIVERSIDE, CITY OF298,398
HELIX WATER DISTRICT277,668
COACHELLA VWD: COVE COMMUNITY270,000
OTAY WATER DISTRICT238,008
MODESTO, CITY OF218,771
SAN BERNARDINO CITY214,665
CUCAMONGA VALLEY WATER DISTRICT211,069
LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER208,129
CITY OF HUNTINGTON BEACH201,000
OXNARD WATER DEPT200,232
CONTRA COSTA WATER DISTRICT198,000
SACRAMENTO SUBURBAN WATER DISTRICT194,444
CITY OF STOCKTON191,302
SWEETWATER AUTHORITY191,282
GLENDALE-CITY, WATER DEPT.188,784
MARIN MUNICIPAL WATER DISTRICT186,895
ONTARIO MUNICIPAL UTILITIES COMPANY185,010
SCWA - LAGUNA/VINEYARD184,896
SANTA ROSA, CITY OF175,396
CITY OF GARDEN GROVE174,226
OCEANSIDE, CITY OF171,483
MOULTON NIGUEL WATER DISTRICT170,236
ELSINORE VALLEY MWD169,455
CORONA, CITY OF168,575
SANTA MARGARITA WATER DISTRICT168,289
PASADENA WATER AND POWER164,344
CITY OF HAYWARD162,954
BAKERSFIELD, CITY OF160,144
CITY OF SUNNYVALE157,566
CITY OF ROSEVILLE155,612
POMONA - CITY, WATER DEPT.151,713
RANCHO CALIFORNIA WATER DISTRICT146,147
CITY OF FULLERTON139,461
ESCONDIDO, CITY OF137,044
VICTORVILLE WATER DISTRICT135,983
JURUPA COMMUNITY SD135,093
VISTA IRRIGATION DISTRICT132,430
EL DORADO ID - MAIN132,171
CITY OF SANTA CLARA130,746
CITY OF CLOVIS130,130
PALMDALE WATER DIST.126,804
CITY OF VALLEJO121,420
CITY OF ORANGE120,770
CITY OF FAIRFIELD120,377
CITY OF ANTIOCH115,074
VALLECITOS WD113,500
VENTURA WATER DEPARTMENT113,500
DOWNEY - CITY, WATER DEPT.110,556
AZUSA LIGHT AND WATER110,044
MESA WATER DISTRICT110,000
SAN BERNARDINO VALLEY WD109,608
CITY OF SANTA MARIA UTILITIES DEPARTMENT109,477
EAST VALLEY WATER DISTRICT108,629
TORRANCE-CITY, WATER DEPT.106,183
BURBANK-CITY, WATER DEPT.105,603
CITY OF DALY CITY104,901
WEST VALLEY WATER DISTRICT104,498
CITY OF SAN JOSE - EVG/EDV/COY101,265
WALNUT VALLEY WATER DISTRICT100,941
HESPERIA WD100,744
SOUTH TAHOE PUD - MAIN100,000
CITY OF VACAVILLE99,650
CITY OF SANTA BARBARA WATER DEPARTMENT99,323
DUBLIN SAN RAMON SERVICES DISTRICT98,776
TRACY, CITY OF96,609
CARLSBAD MWD95,158
VENTURA WWD NO. 8 - SIMI VALLEY94,738
SANTA CRUZ WATER DEPARTMENT94,626
PADRE DAM MWD93,980
CITY OF MERCED93,692
CITY OF REDWOOD CITY92,819
CITY OF WESTMINSTER90,911
SANTA MONICA-CITY, WATER DIVISION89,947
CITY OF REDDING89,628
PLACER CWA - FOOTHILL89,544
OLIVENHAIN MWD86,458
CHINO, CITY OF86,435
WESTERN MWD86,062
MANTECA, CITY OF84,928
NAPA, CITY OF84,804
INDIO WATER AUTHORITY84,757
GOLETA WATER DISTRICT84,462
YORBA LINDA WATER DISTRICT84,292
CITY OF BUENA PARK81,998
CITY OF MILPITAS81,773
CITY OF MOUNTAIN VIEW81,501
FOLSOM, CITY OF - MAIN80,969
INGLEWOOD- CITY, WATER DEPT.80,824
CITY OF ALHAMBRA79,776
UPLAND, CITY OF78,376
REDLANDS CITY MUD-WATER DIV78,025
CITY OF PLEASANTON76,689
SOUTH GATE-CITY, WATER DEPT.76,443
CHINO HILLS, CITY OF76,414
COMPTON-CITY, WATER DEPT.74,877
DESERT WATER AGENCY74,807
TURLOCK, CITY OF72,682
LAS VIRGENES MWD72,602
TULARE, CITY OF72,241
CITY OF YUBA CITY70,256
VALLEY COUNTY WATER DIST.68,871
CITY OF NEWPORT BEACH68,572
LODI, CITY OF68,272
CITRUS HEIGHTS WATER DISTRICT67,818
CITY OF DAVIS67,457
CITY OF PALO ALTO67,231
LYNWOOD-CITY, WATER DEPT.66,967
BEAUMONT CHERRY VALLEY WD66,841
CITY OF TUSTIN66,600
CITY OF MADERA66,560
LAKEWOOD - CITY, WATER DEPT.66,135
WATSONVILLE, CITY OF65,231
BRENTWOOD64,513
PORTERVILLE, CITY OF63,487
CITY OF LA HABRA63,118
CITY OF PITTSBURG62,500
MONTEREY PARK-CITY, WATER DEPT.62,183
HANFORD, CITY OF62,127
NORTH MARIN WATER DISTRICT61,691
CITY OF WOODLAND61,462
PETALUMA, CITY OF60,781
CITY OF GILROY59,203
CITY OF FOUNTAIN VALLEY56,747
ROWLAND WATER DISTRICT56,100
MONTE VISTA WD56,017
PARAMOUNT - CITY, WATER DEPT.55,200
CITY OF LINCOLN54,538
CERES, CITY OF54,513
RIALTO, CITY OF54,453
CITY OF WEST SACRAMENTO53,355
CITY OF THOUSAND OAKS WATER DEPARTMENT53,157
LAKE HEMET MWD52,913
YUCAIPA VALLEY WATER DISTRICT52,010
EL TORO WATER DISTRICT51,800
CITY OF SAN CLEMENTE51,545
DELANO, CITY OF51,428
CITY OF ARCADIA51,361
WHITTIER-CITY, WATER DEPT.49,954
GLENDORA-CITY, WATER DEPT.49,934
POWAY, CITY OF49,888
UC - DAVIS49,616
CITY OF BREA48,479
SAN LUIS OBISPO WATER DEPARTMENT47,788
CERRITOS - CITY, WATER DEPT.47,475
CITY OF LOS BANOS47,419
CITY OF MORGAN HILL47,374
CAMARILLO WATER DEPT46,824
COLTON, CITY OF46,525
CITY OF SAN JOSE - NSJ/ALVISO45,559
HAWTHORNE-CITY WATER DEPT.44,718
ROHNERT PARK, CITY OF43,821
EL CENTRO, CITY OF43,772
COACHELLA WATER AUTHORITY43,590
MISSION SPRINGS WD43,484
DIABLO WATER DISTRICT43,357
CITY OF SAN BRUNO42,631
CAMP PENDLETON (SOUTH)42,219
INDIAN WELLS VALLEY W.D.41,580
CARMICHAEL WATER DISTRICT41,193
SOUTH COAST WATER DISTRICT41,118
CALIFORNIA STATE UNIVERSITY FRESNO41,000
SOQUEL CREEK WATER DISTRICT40,809
PICO RIVERA - CITY, WATER DEPT.40,600
LOMPOC-CITY WATER UTILITY DIV40,473
SAN DIEGUITO WD40,405
CALEXICO, CITY OF40,357
BEVERLY HILLS-CITY, WATER DEPT.40,121
ADELANTO, CITY OF39,930
SANTA MARGARITA WATER DISTRICT-ID939,684
SAN GABRIEL COUNTY WD39,345
CITY OF LIVERMORE38,892
NORTH COAST COUNTY WATER DIST38,546
MARINA COAST WATER DISTRICT38,377
TEJON CASTAC WD - I5 & LAVAL RD38,125
MONROVIA-CITY, WATER DEPT.37,931
RAMONA MUNICIPAL WD37,047
NAS NORTH ISLAND & NAB CORONADO36,990
RUBIDOUX COMMUNITY SD36,827
TRUCKEE-DONNER PUD, MAIN36,730
ESTERO MUNICIPAL IMPROVEMENT DISTRICT36,556
FAIR OAKS WATER DISTRICT36,226
CRESCENTA VALLEY CWD35,841
VENTURA CWWD NO. 1 - MOORPARK35,514
FALLBROOK PUD35,237
CITY OF LATHROP35,080
HEMET, CITY OF33,828
COVINA-CITY, WATER DEPT.33,300
CAMROSA WATER DISTRICT32,700
MANHATTAN BEACH-CITY, WATER DEPT.32,697
EAST NILES CSD32,517
LOS ANGELES CWWD 29 & 80-MALIBU32,348
BANNING, CITY OF31,680
CITY OF BURLINGAME31,451
LA VERNE, CITY WD31,334
CITY OF PASO ROBLES WATER DIVISION31,176
CITY OF SANTA PAULA31,018
CITY OF MARTINEZ30,997
SCWA MATHER-SUNRISE30,825
RINCON DEL DIABLO MWD (ID-1)30,757
MID-PENINSULA WATER DISTRICT30,609
VALLEY CENTER MWD29,938
CALIF STATE POLYTECHNICAL UNIV - POMONA29,854
SAN JUAN WATER DISTRICT29,598
CITY OF EAST PALO ALTO29,519
CITY OF ATWATER29,479
SUISUN-SOLANO WATER AUTHORITY29,105
VERNON-CITY, WATER DEPT.28,112
PLACER CWA - AUBURN/BOWMAN27,294
DINUBA, CITY OF27,281
LEMOORE, CITY OF27,185
CITY OF BENICIA27,131
EUREKA, CITY OF27,078
BRAWLEY, CITY OF26,862
GALT, CITY OF26,536
HI DESERT WD26,411
CITY OF SANGER26,357
BIG BEAR LAKE DWP - BIG BEAR SYSTEM26,132
REEDLEY, CITY OF26,076
HOLLISTER, CITY OF26,017
WINDSOR, TOWN OF25,561
CITY OF SOUTH PASADENA25,329
LOMA LINDA, CITY OF25,129
NORCO, CITY OF25,068
ORCHARD DALE WATER DISTRICT25,000
PATTERSON, CITY OF24,977
CITY OF MOUNTAIN HOUSE24,948
CITY OF SEAL BEACH24,937
RIVERBANK, CITY OF24,834
PHELAN PINON HILLS CSD24,285
SAN FERNANDO-CITY, WATER DEPT.23,946
RAINBOW MUNICIPAL WD23,536
OAKDALE, CITY OF23,235
VALLEY OF THE MOON WATER DISTRICT23,107
EL MONTE-CITY, WATER DEPT.22,968
CORCORAN, CITY OF22,808
CITY OF MILLBRAE22,795
WASCO, CITY OF22,757
SOUTH FEATHER W&P - MINERS RANCH22,664
MENLO PARK MUNICIPAL WATER22,362
PICO WD22,051
TEMESCAL VALLEY WATER DISTRICT21,971
SHAFTER, CITY OF21,915
LINDA COUNTY WATER DISTRICT21,654
IMPERIAL, CITY OF21,591
SANTA FE I.D.21,578
AMERICAN CANYON, CITY OF21,437
PORT HUENEME CITY WATER DEPT21,407
SAN LORENZO VALLEY WATER DIST21,145
ARCATA, CITY OF20,875
WEST KERN WATER DISTRICT20,500
NORWALK - CITY, WATER DEPT.20,283
LOMITA-CITY, WATER DEPT.20,256
HUMBOLDT C.S.D.19,807
ARVIN COMMUNITY SERVICES DIST19,669
SOLEDAD, CITY OF19,455
SANTA FE SPRINGS - CITY, WATER DEPT.19,219
QUARTZ HILL WATER DIST.19,100
LAMONT PUBLIC UTILITY DIST19,057
GREENFIELD, CITY OF18,967
SAN JACINTO, CITY OF18,950
COASTSIDE COUNTY WATER DISTRICT18,940
TWENTYNINE PALMS WATER DISTRICT18,795
BELLA VISTA WATER DISTRICT18,612
NPS GGNRA18,447
LAGUNA BEACH COUNTY WD18,404
CALIFORNIA WATER SERVICE CO.-TRAVIS AFB18,111
CITY OF ARROYO GRANDE UTILITIES DIVISION17,963
ROSAMOND CSD17,711
WESTERN MWD - MURRIETA DIVISION17,453
COALINGA-CITY17,277
CITY OF CRESCENT CITY17,262
KERMAN, CITY OF17,256
NEVADA ID - E. GEORGE, BANNER MOUNTAIN17,154
MCKINLEYVILLE C.S.D.16,900
TOWN OF DISCOVERY BAY16,790
PINEDALE COUNTY WATER DISTRICT16,736
UKIAH, CITY OF16,607
OLIVEHURST PUBLIC U.D.16,595
EL SEGUNDO-CITY, WATER DEPT.16,445
FILLMORE WATER DEPT16,419
CITY OF CUPERTINO16,336
NASA AMES RESEARCH CENTER16,273
USMC - 29 PALMS16,067
CARPINTERIA VALLEY WATER DISTRICT15,996
CITY OF LA PALMA15,948
RIPON, CITY OF15,741
US ARMY FORT IRWIN15,701
RIO LINDA/ELVERTA COMMUNITY WATER DIST15,460
NORTHSTAR C.S.D.15,452
HUNTINGTON PARK-CITY, WATER DEPT.15,437
SOUTH MONTEBELLO IRRIGATION DIST.15,021
CALIFORNIA MENS COLONY15,000
LEMOORE NAVAL AIR STATION15,000
SBDNO COUNTY SERVICE AREA 6414,911
CITY OF LIVINGSTON14,894
CITY OF RED BLUFF14,710
CITY OF PARLIER14,576
CITY OF MODESTO - SALIDA14,537
MCFARLAND, CITY OF14,161
NEVADA ID - LOMA RICA14,072
CHOWCHILLA CITY WATER DEPT13,916
NIPOMO COMM SERVICES DIST13,771
MORRO BAY PW DEPT - WATER DIVISION13,757
AVENAL, CITY OF13,696
TRABUCO CANYON WATER DISTRICT13,659
KINGSBURG, CITY OF13,540
WESTBOROUGH WATER DISTRICT13,486
TUD - UPPER BASIN WATER SYSTEM13,280
SBDNO COUNTY SERVICE AREA 70J12,843
BIG BEAR CITY CSD12,738
CITY OF GROVER BEACH PUBLIC WORKS DEPT12,701
LINDSAY, CITY OF12,659
CAMP PENDLETON (NORTH)12,651
LOS ANGELES CWWD 40, REG. 38-LAKE LA12,568
CITY OF DIXON12,540
CITY OF NEWMAN-WATER DEPARTMENT12,207
THERMALITO WATER & SEWER DIST12,136
FORTUNA, CITY OF12,133
MONTECITO WATER DIST11,962
SIGNAL HILL - CITY, WATER DEPT.11,848
TOWN OF HILLSBOROUGH11,766
SONOMA, CITY OF11,725
CRESTLINE VILLAGE CWD - DIVISION 1011,650
GREENFIELD COUNTY WD11,590
CCWD - EBBETTS PASS11,545
LOS ANGELES CWWD 40, R 24,27,33-PEARBLSM11,509
CITY OF BELL GARDENS11,437
MENDOTA, CITY OF11,404
EDWARDS AFB - MAIN BASE11,316
SCOTTS VALLEY WATER DISTRICT11,197
EXETER, CITY OF11,169
CITY OF ANDERSON11,147
TUD - SONORA/JAMESTOWN WATER SYSTEM11,054
CASITAS MUNICIPAL WATER DIST11,005
SIERRA MADRE-CITY, WATER DEPT.11,000
SONOMA STATE UNIVERSITY10,986
HEALDSBURG, CITY OF10,985
CALIFORNIA INSTITUTION FOR MEN10,667
CITY OF SHASTA LAKE10,657
CITY OF RIO VISTA10,489
PLUMAS LAKE10,464
FARMERSVILLE, CITY OF10,243
SCWA - ARDEN PARK VISTA10,101
CCWD - JENNY LIND9,861
GOLDEN HILLS CSD9,857
BLYTHE - CITY OF9,798
WINTON WATER & SANITARY DIST9,745
CITY OF ORANGE COVE9,525
GEORGETOWN DIVIDE PUD9,434
HURON, CITY OF9,306
LA CANADA IRRIGATION DIST.9,300
CITY OF LIVE OAK9,285
CALIFORNIA STATE FAIR9,280
PLACERVILLE, CITY OF - MAIN9,224
PARADISE IRRIGATION DISTRICT9,142
NEVADA ID - LAKE WILDWOOD9,108
TEHACHAPI, CITY OF9,094
CLEAR CREEK CSD-ANDERSON8,900
GUADALUPE WATER DEPARTMENT8,897
AWA BUCKHORN PLANT8,791
CITY OF WATERFORD8,788
NEEDLES, CITY OF8,766
NAVAL BASE VENTURA COUNTY, PORT HUENEME8,625
GONZALES, CITY OF8,327
OROSI PUBLIC UTILITY DISTRICT8,300
CITY OF ORLAND8,298
CITY OF CORNING8,244
LA PUENTE VALLEY CWD8,243
MAMMOTH CWD8,234
FIREBAUGH CITY8,096
PISMO BEACH WATER DEPARTMENT8,036
TEMPLETON CSD8,011
KIRKWOOD MEADOWS PUBLIC UTILITY DISTRICT7,851
WOODLAKE, CITY OF7,846
FLORIN COUNTY WATER DISTRICT7,831
YREKA, CITY OF7,825
CITY OF SUSANVILLE7,811
DELHI CWD7,784
EARLIMART PUD7,679
OCEANO COMM SERVICES DIST.7,601
SEBASTOPOL, CITY OF7,522
CASTROVILLE COMMUNITY SERVICES DISTRICT7,515
FOLSOM STATE PRISON7,502
HUGHSON, CITY OF7,481
CITY OF DOS PALOS7,452
CITY OF FOWLER7,448
ESCALON, CITY OF7,429
SAN GABRIEL VALLEY WATER CO-MONTEBELLO 27,330
VANDENBERG VILLAGE COMM. SERV. DIST.7,308
COTATI, CITY OF7,303
CITY OF GRIDLEY7,269
AWA, IONE7,227
CITY OF WINTERS7,115
LOS OSOS COMMUNITY SERVICES DISTRICT7,086
LAKE ARROWHEAD CSD7,038
SANTA YNEZ RIVER WATER CONS. DIST. ID#17,022
PETER PITCHESS HONOR RANCHO DETN. CTR7,000
FORT BRAGG, CITY OF6,919
NEVADA ID - LAKE OF PINES6,870
NEVADA ID - NORTH AUBURN6,870
BEALE AIR FORCE BASE6,785
FORESTHILL PUBLIC UTILITY DIST6,782
JOSHUA BASIN WATER DISTRICT6,640
CHINA LAKE NAVAL AIR WEAPONS STATION6,600
PSMCSD - PAJARO6,500
CITY OF COLUSA6,447
LOS ANGELES CWWD 36-VAL VERDE6,376
HOLTVILLE, CITY OF6,355
HELENDALE COMMUNITY SERVICE DISTRICT6,347
NORTH TAHOE PUD - MAIN6,321
CALAVERAS PUD6,286
PURISSIMA HILLS WATER DISTRICT6,245
HIDDEN VALLEY LAKE CSD6,235
CUTLER PUD6,200
WILLITS, CITY OF6,175
CITY OF INDUSTRY WATERWORKS SYSTEMS6,158
SOLVANG WATER DIVISION6,126
CITY OF GUSTINE6,110
VENTURA RIVER WATER DISTRICT6,100
MONTARA WATER AND SANITARY DISTRICT6,078
SWEETWATER SPRINGS CWD - GUERNEVILLE6,000
BELLFLOWER MUNICIPAL WATER SYSTEM5,999
MALAGA COUNTY WATER DISTRICT5,979
KONOCTI COUNTY WATER DISTRICT5,928
GLEN HELEN WATER SYSTEM5,900
SAN JOAQUIN COUNTY - LINCOLN VILLAGE5,841
RANCHO MURIETA COMMUNITY SERVI5,728
NAVAL BASE VENTURA COUNTY, POINT MUGU5,700
KEYES COMMUNITY SERVICES DIST.5,672
TAHOE CITY PUD - MAIN5,661
SERRANO WATER DISTRICT5,659
CALISTOGA, CITY OF5,610
BEAR VALLEY CSD5,592
CDCR CALIFORNIA HEALTH CARE FACILITY5,551
CITY OF WILLIAMS5,538
CAMBRIA COMM SERVICES DIST5,532
PALM RANCH IRRIGATION DIST.5,507
HILMAR COUNTY WATER DISTRICT5,504
MILLVIEW COUNTY WATER DISTRICT5,500
TUD - COLUMBIA WATER SYSTEM5,463
ST. HELENA, CITY OF5,386
LA HABRA HEIGHTS CWD5,325
RUNNING SPRINGS WATER DISTRICT5,268
REDWOOD VALLEY COUNTY WATER DISTRICT5,200
CCWD - COPPER COVE5,187
CITY OF BUELLTON WATER DIVISION5,161
WASCO ST. PRISON RECEPTION CTR5,124
CALIFORNIA STATE PRISON - SOLANO5,100
DENAIR COMMUNITY SERVICES DISTRICT5,090
CITY OF JACKSON5,019
KERN VALLEY STATE PRISON5,000
CITY OF GRASS VALLEY4,947
AWA, TANNER4,940
STALLION SPRINGS CSD4,910
SSWD - DEL PASO MANOR SERVICE AREA4,854
LOS ANGELES CWWD 37-ACTON4,805
CALIPATRIA STATE PRISON4,800
UNION PUBLIC UTILITY DISTRICT4,774
LAKEPORT, CITY OF4,762
MOJAVE PUD4,699
COACHELLA VWD: I.D. NO. 84,600
IVANHOE PUBLIC UTILITY DIST4,580
CHANNEL ISLANDS BEACH CSD4,560
NORTHSTAR CSD - MARTIS VALLEY4,493
PALOMAR OBSERVATORY4,416
SUBURBAN WATER SYSTEMS - SATIVA4,363
MT. KONOCTI MUTUAL WATER COMPANY4,360
CALIFORNIA REHABILITATION CENTER - NORCO4,300
CORRECTIONAL TRAINING FACILITY - SOLEDAD4,269
COMMERCE-CITY, WATER DEPT.4,205
MEINERS OAKS CWD4,200
MEADOW VISTA CWD4,183
PLANADA CSD4,164
CENTERVILLE C.S.D.4,151
RUSSIAN RIVER COUNTY WATER DISTRICT4,150
ARMONA COMMUNITY SERVICES DIST4,143
CITY OF WHEATLAND4,124
KELSEYVILLE CO WATERWORKS DISTRICT 34,102
ATASCADERO STATE HOSPITAL4,100
CENTINELA STATE PRISON4,100
CHUCKAWALLA VALLEY STATE PRISON4,090
SAN JOAQUIN, CITY OF4,060
LAKE COUNTY CSA 21 - NORTH LAKEPORT4,046
WEAVERVILLE C.S.D.3,975
JOINT REGIONAL WATER SUPPLY SYSTEM3,947
DEL MAR, CITY OF3,919
BIGHORN - DESERT VIEW WATER AGENCY3,916
TREASURE ISLAND3,864
CDCR-HIGH DESERT STATE PRISON3,857
ANGELS, CITY OF3,836
GILBERT STREET COMPLEX3,833
BISHOP, CITY OF3,819
SAN JOAQUIN COUNTY-MOKELUMNE ACRES3,802
WILLOW COUNTY WATER DISTRICT3,797
FORESTVILLE WATER DISTRICT3,788
AMERICAN VALLEY CSD3,778
IDYLLWILD WATER DISTRICT3,762
MT. SHASTA, CITY OF3,642
BROOKTRAILS TOWNSHIP CSD3,632
MISSION HILLS CSD3,600
ESPARTO C.S.D.3,574
LOCKEFORD COMMUNITY SERV. DIST.3,572
CDCR - SIERRA CONSERVATION CENTER3,571
COBB AREA COUNTY WATER DISTRICT3,515
PRESIDIO OF SAN FRANCISCO3,500
EAST ORANGE COUNTY WD - RZ3,464
BORREGO WD3,429
CITY OF BRISBANE3,402
RIO ALTO WATER DISTRICT3,329
FOLSOM, CITY OF - ASHLAND3,317
COTTONWOOD WATER DISTRICT3,316

Largest first by population served, as each employer reports it to its federal registry.

Source: U.S. Environmental Protection Agency, Safe Drinking Water Information System (SDWIS/Fed), community water systems. Data captured October 2, 2026.

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