PlainWater

Public Water Systems

7,249 active public water systems in CA, tracked from EPA's Safe Drinking Water Information System (SDWIS) across all 50 states. See our methodology.

Population Violations Health Violations Name
System Name Location Population Violations PFAS
Loma Linda University Loma Linda, CA 15,368 5 Detected
Usmc - 29 Palms 29 Palms, CA 15,248 11 Clean
Thousand Pines Christian Crestline, CA 15,034 5 -
South Montebello Irrigation Dist. Montebello, CA 15,021 13 Detected
Caltrans-Maxwell Reststops Grass Valley, CA 15,000 3 -
Lemoore Naval Air Station Lemoore, CA 15,000 83 Clean
California Mens Colony San Luis Obispo, CA 15,000 11 Clean
American Water O&m, LLC - Vsfb Vandenberg Sfb, CA 14,971 17 Clean
Sbdno County Service Area 64 San Bernardino, CA 14,911 7 Clean
City of Livingston Livingston, CA 14,894 35 Clean
City of Red Bluff Red Bluff, CA 14,710 20 Detected
City of Parlier Parlier, CA 14,576 32 Clean
City of Modesto - Salida Modesto, CA 14,537 25 Clean
Hanna Flats Campground San Bernardino, CA 14,380 0 -
California City, City Of California City, CA 14,198 37 Clean
McFarland, City Of McFarland, CA 14,161 157 Clean
Nevada ID - Loma Rica Grass Valley, CA 14,072 0 Clean
Tract 180 Mutual Water Co. Cudahy, CA 14,000 73 Detected
Chowchilla City Water Dept Chowchilla, CA 13,916 23 Detected
Triunfo Water & Sanitation District Westlake Village, CA 13,898 11 Clean
Nipomo Comm Services Dist Nipomo, CA 13,771 8 Clean
Morro Bay Pw Dept - Water Division Morro Bay, CA 13,757 13 Clean
Avenal, City Of Avenal, CA 13,696 91 Clean
Trabuco Canyon Water District Trabuco Canyon, CA 13,659 16 Clean
Kingsburg, City Of Kingsburg, CA 13,540 35 Clean
Westborough Water District South San Francisco, CA 13,486 4 Clean
Tud - Upper Basin Water System Sonora, CA 13,280 2 Clean
Palomar Christian Conference Center Palomar Mtn Road, CA 13,050 16 -
Indian Hills Camp Jamul, CA 13,032 25 -
Muscoy MWC No. 1 San Bernardino, CA 13,000 45 Clean
Sbdno County Service Area 70J San Bernardino, CA 12,843 5 Clean
Big Bear City Csd Big Bear City, CA 12,738 1 Detected
City of Grover Beach Public Works Dept Grover Beach, CA 12,701 8 Clean
Lindsay, City Of Linsday, CA 12,659 178 Detected
Camp Pendleton (North) Camp Pendleton, CA 12,651 21 -
Los Angeles Cwwd 40, Reg. 38-Lake La Alhambra, CA 12,568 1 Clean
City of Dixon Dixon, CA 12,540 4 Clean
Cal-Water Service Co.-Marysville San Jose, CA 12,419 2 Clean
City of Newman-Water Department Newman, CA 12,207 19 Clean
Thermalito Water & Sewer Dist Oroville, CA 12,136 11 Detected
Fortuna, City Of Fortuna, CA 12,133 5 Clean
Cabrillo College Aptos, CA 12,000 7 Clean
Montecito Water Dist Santa Barbara, CA 11,962 10 Clean
Lupine Bass Lake Clovis, CA 11,930 47 -
Signal Hill - City, Water Dept. Signal Hill, CA 11,848 21 Clean
Town of Hillsborough Hillsborough, CA 11,766 5 Clean
Sonoma, City Of Sonoma, CA 11,725 17 Detected
Crestline Village Cwd - Division 10 Crestline, CA 11,650 10 Detected
Greenfield County WD Bakersfield, CA 11,590 114 Clean
Ccwd - Ebbetts Pass San Andreas, CA 11,545 21 Clean
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