California

California drinking water quality

Every public water system in California we've verified. Each report covers one calendar year and shows the utility's own measured contaminant levels against federal limits.

• Alameda (2024)
  29 contaminants measured· 2 at or above the limit
• Albany (2024)
  29 contaminants measured· 2 at or above the limit
• Antioch (2024)
  15 contaminants measured· 2 at or above the limit
  20242024
• Bakersfield (2024)
  40 contaminants measured
• Berkeley (2024)
  29 contaminants measured· 2 at or above the limit
• City of Brentwood (2024)
  15 contaminants measured· 2 at or above the limit
  20242024
• Burbank (2024)
  46 contaminants measured· 20 at or above the limit
• Castro Valley (2024)
  29 contaminants measured· 2 at or above the limit
• Chico (2024)
  41 contaminants measured
• Chula Vista Otay (2024)
  18 contaminants measured· 1 at or above the limit
• Chula Vista Sweetwater (2024)
  37 contaminants measured· 7 at or above the limit
• Clovis (2024)
  15 contaminants measured
• Concord (2024)
  15 contaminants measured· 2 at or above the limit
• Costa Mesa (2024)
  37 contaminants measured· 2 at or above the limit
• Crockett (2024)
  29 contaminants measured· 2 at or above the limit
• City of Cupertino (2024)
  20 contaminants measured
• Daly City (2024)
  31 contaminants measured
• Diablo Water District (2024)
  15 contaminants measured· 2 at or above the limit
  20242024
• East Valley Service Area (2024)
  31 contaminants measured· 5 at or above the limit
• El Cajon (2024)
  45 contaminants measured· 3 at or above the limit
• El Cerrito (2024)
  29 contaminants measured· 2 at or above the limit
• El Monte (2024)
  25 contaminants measured· 3 at or above the limit
• El Sobrante (2024)
  29 contaminants measured· 2 at or above the limit
• Emeryville (2024)
  29 contaminants measured· 2 at or above the limit
• Escondido (2024)
  31 contaminants measured· 1 at or above the limit
• Fairfield (2024)
  22 contaminants measured
• Fontana (2024)
  35 contaminants measured· 4 at or above the limit
• Fullerton (2024)
  45 contaminants measured· 4 at or above the limit
• Glendale (2024)
  38 contaminants measured· 5 at or above the limit
• Golden State Water Company (2024)
  15 contaminants measured· 2 at or above the limit
  20242024
• Hayward (2024)
  29 contaminants measured· 2 at or above the limit
  20242024
• City of Hemet (2024)
  31 contaminants measured· 5 at or above the limit
• Hercules (2024)
  29 contaminants measured· 2 at or above the limit
• Hesperia (2024)
  35 contaminants measured
• Huntington Beach (2025)
  37 contaminants measured· 3 at or above the limit
• Inglewood (2023)
  38 contaminants measured· 4 at or above the limit
• Irvine (2023)
  45 contaminants measured· 3 at or above the limit
• Kensington (2024)
  29 contaminants measured· 2 at or above the limit
• Lafayette (2024)
  29 contaminants measured· 2 at or above the limit
• Los Angeles LADWP (2023)
  33 contaminants measured
• City of Martinez (2024)
  15 contaminants measured· 2 at or above the limit
  20242024
• City of Menifee (2024)
  31 contaminants measured· 5 at or above the limit
• Mills Service Area (2024)
  31 contaminants measured· 5 at or above the limit
• Moraga (2024)
  29 contaminants measured· 2 at or above the limit
• Moreno Valley (2024)
  31 contaminants measured· 5 at or above the limit
• City of Murrieta (2024)
  31 contaminants measured· 5 at or above the limit
• Oakland (2024)
  29 contaminants measured· 2 at or above the limit
• Ontario (2024)
  40 contaminants measured· 7 at or above the limit
• Orinda (2024)
  29 contaminants measured· 2 at or above the limit
• Oxnard (2024)
  33 contaminants measured· 4 at or above the limit
• Pasadena (2023)
  65 contaminants measured· 2 at or above the limit
• City of Perris (2024)
  31 contaminants measured· 5 at or above the limit
• Piedmont (2024)
  29 contaminants measured· 2 at or above the limit
• Pinole (2024)
  29 contaminants measured· 2 at or above the limit
• City of Pittsburg (2024)
  15 contaminants measured· 2 at or above the limit
  20242024
• Pomona (2024)
  68 contaminants measured· 27 at or above the limit
• Rancho Cucamonga (2024)
  16 contaminants measured
• Rialto (2024)
  34 contaminants measured· 2 at or above the limit
• Richmond (2024)
  29 contaminants measured· 2 at or above the limit
• Riverside (2024)
  18 contaminants measured· 1 at or above the limit
• Rodeo (2024)
  29 contaminants measured· 2 at or above the limit
• Salinas (2024)
  37 contaminants measured
• San Diego (2023)
  33 contaminants measured· 4 at or above the limit
• San Francisco SFPUC (2023)
  31 contaminants measured· 1 at or above the limit
• City of San Jacinto (2024)
  31 contaminants measured· 5 at or above the limit
• San Jose (2024)
  20 contaminants measured
• San Leandro (2024)
  29 contaminants measured· 2 at or above the limit
• San Lorenzo (2024)
  29 contaminants measured· 2 at or above the limit
• San Mateo (2024)
  30 contaminants measured
• San Pablo (2024)
  29 contaminants measured· 2 at or above the limit
• Santa Ana (2024)
  51 contaminants measured· 2 at or above the limit
• Santa Clara (2024)
  18 contaminants measured
• Santa Clarita (2024)
  30 contaminants measured· 2 at or above the limit
• Santa Rosa (2024)
  30 contaminants measured· 4 at or above the limit
• Simi Valley (2024)
  36 contaminants measured
• Skinner Service Area (2024)
  31 contaminants measured· 5 at or above the limit
• Stockton (2024)
  32 contaminants measured
• Sunnyvale (2024)
  26 contaminants measured
• City of Temecula (2024)
  31 contaminants measured· 5 at or above the limit
• Thousand Oaks (2024)
  31 contaminants measured
• Torrance (2024)
  24 contaminants measured· 6 at or above the limit
• Tracy (2024)
  52 contaminants measured
• Vacaville (2024)
  33 contaminants measured· 1 at or above the limit
• Vallejo (2024)
  22 contaminants measured· 2 at or above the limit
• Ventura (2023)
  37 contaminants measured· 4 at or above the limit
• Victorville (2024)
  27 contaminants measured
• Visalia (2024)
  41 contaminants measured
• West Covina (2024)
  37 contaminants measured· 4 at or above the limit