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Below are the results for the largest utilities serving County

Utility name City People served
Los Angeles Department of Water and PowerLos Angeles, CAPopulation served:3,935,257
Long Beach Water DepartmentLong Beach, CAPopulation served:470,292
Golden State Water Company (GSWC) - SouthwestGardena, CAPopulation served:271,677
San Gabriel Valley Water Company- El MonteEl Monte, CAPopulation served:226,904
Glendale Water DepartmentGlendale, CAPopulation served:195,799
Los Angeles County WW District 4 & 34-LancasterAlhambra, CAPopulation served:180,131
PasadenaPasadena, CAPopulation served:165,740
Suburban Water Systems - San JoseCovina, CAPopulation served:162,031
Pomona Water DepartmentPomona, CAPopulation served:151,713
California Water Service Company - East Los AngelesSan Jose, CAPopulation served:150,446

Below are the results for utilities serving the searched zip code and the surrounding county.

Utility name City People served
Acton Rehab Center Population served: 500
Alpine Springs Mobile Home Park Palmdale Population served: 120
Amarillo Mutual Water Company Rosemead Population served: 3,134
Antelope Park Mutual Water Company Lancaster Population served: 1,500
Antelope Valley - East Kern Water Agency Palmdale Population served: 0
Aqua J. Mutual Water Company Lancaster Population served: 100
Averydale Mutual Water Company Lancaster Population served: 960
Azusa Light and Water Azusa Population served: 110,000
Bellflower - Somerset MWC Bellflower Population served: 46,000
Bellflower Home Gardens Water Company Bellflower Population served: 1,129
Bellflower Municipal Water System Bellflower Population served: 5,967
Beverly Hills Water Department Beverly Hills Population served: 44,290
Bleich Flat Mutual Water Company Lancaster Population served: 75
Blue Skies Mobile Home Park Yorba Linda Population served: 200
Blue Skies Trailer Park Palmdale Population served: 40
Burbank Water Department Burbank Population served: 105,543
Cal-am Water Company - Duarte Rosemead Population served: 21,589
Cal/am Water Company - Baldwin Hills Rosemead Population served: 18,397
Cal/Am Water Company - San Marino Rosemead Population served: 40,804
Calif State Polytechnical Univ - Pomona Pomona Population served: 24,880
California Domestic Water Company Whittier Population served: 1,200
California Water Service Co-lake Hughes San Jose Population served: 673
California Water Service Co-leona Valley San Jose Population served: 1,256
California Water Service Company - Dominguez San Jose Population served: 142,111
California Water Service Company - East Los Angeles San Jose Population served: 150,446
California Water Service Company - Hermosa / Redondo Beach San Jose Population served: 95,605
California Water Service Company - Palos Verde San Jose Population served: 69,883
California Water Service Company-Lancaster San Jose Population served: 1,813
Californian Mobile Home Park Lancaster Population served: 217
Camp Williams-resort Water Azusa Population served: 80
Casa Dulce Estates Agua Dulce Population served: 32
Castaic Lake Water Agency Santa Clarita Population served: 0
Central Basin Municipal Water District Commerce Population served: 0
Cerritos - City, Water Department Cerritos Population served: 49,041
City of Alhambra Alhambra Population served: 84,679
City of Arcadia Arcadia Population served: 57,639
City Of Industry Waterworks Systems La Puente Population served: 7,000
City of Inglewood Inglewood Population served: 82,500
City of South Pasadena South Pasadena Population served: 25,899
City of Torrance Water Department Torrance Population served: 145,438
Clear Skies Mobile Home Ranch Lancaster Population served: 75
Colorado Mutual Water Company Lancaster Population served: 30
Commerce-city, Water Department San Jose Population served: 3,828
Compton Water Department Compton Population served: 81,963
Covina Irrigating Company Covina Population served: 0
Covina Water Department Covina Population served: 33,300
Crescenta Valley CWD La Crescenta Population served: 32,000
Desert Palms Mobile Home Park Lancaster Population served: 140
Downey Water Department Downey Population served: 111,930
East Pasadena Water Company Pasadena Population served: 10,978
El Dorado Mutual Water Company Palmdale Population served: 648
El Monte Water Department El Monte Population served: 22,968
El Rancho Mobile Home Park Santa Monica Population served: 216
El Segundo Water Department El Segundo Population served: 16,654
Evergreen Mutual Water Company Lancaster Population served: 99
Fenner Canyon Youth Conservation Camp Valyermo Population served: 135
Follows Camp Azusa Population served: 250
Foothill Municipal Water District La Canada Flintridge Population served: 0
Glendale Water Department Glendale Population served: 195,799
Glendora Water Department Glendora Population served: 45,300
Golden Sands Mobile Home Park Canyon Country Population served: 450
Golden State Water Company (GSWC) - Artesia Rancho Cordova Population served: 47,978
Golden State Water Company (GSWC) - Bell, Bell Gardens Rancho Cordova Population served: 57,934
Golden State Water Company (GSWC) - Claremont San Dimas Population served: 37,160
Golden State Water Company (GSWC) - Culver City Rancho Cordova Population served: 36,215
Golden State Water Company (GSWC) - Florence/Graham Rancho Cordova Population served: 65,492
Golden State Water Company (GSWC) - Norwalk Rancho Cordova Population served: 44,466
Golden State Water Company (GSWC) - San Dimas San Dimas Population served: 54,872
Golden State Water Company (GSWC) - South Arcadia San Dimas Population served: 26,827
Golden State Water Company (GSWC) - South San Gabriel San Dimas Population served: 27,656
Golden State Water Company (GSWC) - Southwest Gardena Population served: 271,677
Golden State Water Company (GSWC) -Willowbrook Rancho Cordova Population served: 10,771
Golden Valley Municipal Water District Gorman Population served: 1,030
Green Valley County Water District Green Valley Population served: 1,000
Gswc - Hollydale Rancho Cordova Population served: 7,661
Hawthorne Water Department San Jose Population served: 43,545
Hemlock Mutual Water Company El Monte Population served: 864
Huntington Park Water Department Huntington Park Population served: 17,209
Kinneloa Irrigation District Pasadena Population served: 1,931
La Canada Irrigation District La Canada Population served: 9,300
La Habra Heights County Water District La Habra Heights Population served: 5,379
La Puente Valley County Water District La Puente Population served: 9,852
La Verne WD La Verne Population served: 32,230
Lake Elizabeth Mutual Water Company Lake Elizabeth Population served: 1,750
Lakewood Water Department Lakewood Population served: 59,081
Lancaster Park Mobile Home Park Los Osos Population served: 53
Lancaster Water Company Lancaster Population served: 66
Land Project Mutual Water Company Lancaster Population served: 1,500
Landale Mutual Water Company Lancaster Population served: 500
Las Flores Water Company Altadena Population served: 4,500
Las Virgenes Municipal Water District Calabasas Population served: 75,384
Leisure Lake Mobile Estates Chandler Population served: 280
Liberty Utilities - Bellflower - Norwalk Downey Population served: 72,884
Lily Of The Valley Mobile Village Saugus Population served: 600
Lincoln Avenue Water Company Altadena Population served: 16,000
Little Baldy Water Llano Population served: 150
Littlerock Creek Irrigation District Littlerock Population served: 2,900
Llano Del Rio Water Company Llano Population served: 264
Llano Mutual Water Company Llano Population served: 449
Lomita Water Department Lomita Population served: 20,256
Long Beach Water Department Long Beach Population served: 470,292
Los Angeles County Waterworks District 21-kagel Canyon Alhambra Population served: 550
Los Angeles County Waterworks District 36-Val Verde Alhambra Population served: 5,150
Los Angeles County Waterworks District 37-Acton Alhambra Population served: 6,509
Los Angeles County Waterworks District 40 Reg. 35 - N.E. L.A. Alhambra Population served: 770
Los Angeles County Waterworks District 40 Reg. 39-Rock Creek Alhambra Population served: 1,305
Los Angeles County WW District 29 & 80-Malib Alhambra Population served: 31,040
Los Angeles County WW District 4 & 34-Lancaster Alhambra Population served: 180,131
Los Angeles County WW District 40 Reg 38 Lake Los Angeles Alhambra Population served: 13,600
Los Angeles CWWD 40, R24, 27,33-Pearblsm Alhambra Population served: 10,557
Los Angeles Department of Water and Power Los Angeles Population served: 3,935,257
Los Angeles, City Of - Power Plant #1 Los Angeles Population served: 37
Los Angeles, City Of - Power Plant #2 Los Angeles Population served: 32
Lynwood Park Mutual Water Company Compton Population served: 2,300
Lynwood Water Department Lynwood Population served: 71,297
Manhattan Beach Water Department Manhattan Beach Population served: 35,726
Maywood Mutual Water Company #1 Huntington Park Population served: 5,500
Maywood Mutual Water Company #2 Maywood Population served: 7,118
Maywood Mutual Water Company #3 Maywood Population served: 9,500
Mesa Crest Water Company La Canada Population served: 2,500
Metropolitan Water District of So. Cal. Los Angeles Population served: 0
Mettler Valley Mutual Lancaster Population served: 100
Monrovia Water Department Monrovia Population served: 36,590
Montebello Land & Water Company Montebello Population served: 32,219
Montebello-city, Water Department El Monte Population served: 6,962
Monterey Park Water Department Monterey Park Population served: 62,183
Newhall Cwd-castaic Santa Clarita Population served: 6,376
Newhall CWD-Newhall Santa Clarita Population served: 12,487
Newhall Cwd-pinetree Santa Clarita Population served: 9,148
Newhall Cwd-tesoro Del Valle Santa Clarita Population served: 3,825
North Trails Mutual Water Company Agua Dulce Population served: 200
Norwalk Water Department Norwalk Population served: 18,372
Oak Grove Trailer Park Sleepy Valley Population served: 85
Orchard Dale Water District Whittier Population served: 22,492
Palm Ranch Irrigation District Quartz Hill Population served: 5,530
Palmdale Water District Palmdale Population served: 116,183
Paradise Ranch Mobile Home Park Beverly Hills Population served: 290
Paramount Water Department Paramount Population served: 55,051
Park Water Company - Bell Gardens Downey Population served: 11,879
Park WC - Compton Downey Population served: 24,698
Park WC - Lynwood Downey Population served: 24,791
Pasadena Pasadena Population served: 165,740
Peter Pitchess Honor Rancho Detention Center Alhambra Population served: 7,000
Pico Rivera Water Department Pico Rivera Population served: 39,000
Pico WD Pico Rivera Population served: 24,100
Pomona Water Department Pomona Population served: 151,713
Quartz Hill Water District Quartz Hill Population served: 22,000
Reesedale Mutual Lancaster Population served: 100
Rivers End Trailer Park Canyon Country Population served: 25
Rowland Water District Rowland Heights Population served: 62,106
Rubio Canon Land & Water Association Altadena Population served: 9,600
Rurban Homes Mutual Water Company El Monte Population served: 1,200
San Fernando Water Department San Fernando Population served: 23,839
San Gabriel County WD Rosemead Population served: 45,000
San Gabriel Valley Water Company- El Monte El Monte Population served: 226,904
San Gabriel Valley Water Company-Montebello El Monte Population served: 8,858
Santa Clarita Water Division Santa Clarita Population served: 120,900
Santa Fe Springs Water Department Santa Fe Springs Population served: 18,199
Santa Monica Santa Monica Population served: 92,185
Sativa-L.A. County Water District Compton Population served: 6,837
Shadow Acres Mutual Water Company Palmdale Population served: 385
Sherwood Mobile Home Park Lancaster Population served: 740
Sierra Madre Water Department Sierra Madre Population served: 11,094
Signal Hill - City, Water Department Signal Hill Population served: 11,411
Sleepy Valley Water Company Saugus Population served: 100
South Gate Water Department South Gate Population served: 96,057
South Montebello Irrigation District Montebello Population served: 9,574
Southern California Edison Company-Santa Catalina Avalon Population served: 4,200
Spv Water Company Agua Dulce Population served: 211
Sterling Mutual Water Company El Monte Population served: 776
Suburban Water Systems - La Mirada Covina Population served: 56,953
Suburban Water Systems - San Jose Covina Population served: 162,031
Suburban Water Systems - Whittier Covina Population served: 59,169
Suburban Water Systems-covina Knolls Covina Population served: 1,548
Suburban Water Systems-glendora Covina Population served: 4,802
Sundale Mutual Water Company A, B Lancaster Population served: 1,100
Sunny Slope Water Company Pasadena Population served: 32,427
Sunnyside Farms Mutual Water Company Palmdale Population served: 326
Terra Nova Mobile Home Park Visalia Population served: 120
The Oaks Lake Hughes Population served: 25
The Painted Turtle Camp Lake Hughes Population served: 50
The River Community Azusa Population served: 63
The Robin S Nest Recr. Resort Acton Population served: 50
The Village Mobile Home Park Lancaster Population served: 70
Three Valleys Municipal Water District Claremont Population served: 0
Tierra Bonita Mutual Water Lancaster Population served: 35
Tract 180 Mutual Water Company Cudahy Population served: 14,000
Tract 349 Mutual Water Co. Cudahy Population served: 7,500
Valencia Heights Water Company West Covina Population served: 5,500
Valencia Water Company Valencia Population served: 117,251
Valhalla Water Association Tujunga Population served: 48
Valley County Water District Baldwin Park Population served: 70,271
Valley View Mutual Water Company Baldwin Park Population served: 4,074
Valley Water Company La Canada Flintridge Population served: 9,900
Vernon Water Department Vernon Population served: 45,000
Walnut Park Mutual Water Company Huntington Park Population served: 16,180
Walnut Valley Water District Walnut Population served: 115,475
West Valley County Water District Lancaster Population served: 736
Western Skies Mobile Home Park Lancaster Population served: 240
Westside Park Mutual Water Palmdale Population served: 500
White Fence Farms Mutual Water Company Palmdale Population served: 1,145
White Fence Farms Mutual Water Company No. 3 Quartz Hill Population served: 636
White Rock Lake Rv Park Saugus Population served: 38
Whittier Water Department Whittier Population served: 49,954
Wilsona Gardens Mutual Lancaster Population served: 75
Winterhaven Mobile Estates Lancaster Population served: 40
Young-nak Presbyterian Church Los Angeles Population served: 2,015