Here are 179 California cities ranked by water quality – Worst to Best.
We started with the most contaminated city water supply and made our way to the least.
The cities are color-coded for easy comparison.
California Cities Ranked by Water Quality:
- Fresno – 53 contaminants
- Lake Elsinore – 47
- Corona – 45
- Rialto – 44
- Thousand Oaks – 44
- Irvine – 42
- Bakersfield – 41
- Modesto – 41
- Chico – 40
- Livermore – 40
- Lodi – 40
- Anaheim – 39
- Norwalk – 39
- San Jose – 39
- Santa Barbara – 39
- Visalia – 39
- Garden Grove – 38
- Jurupa Valley – 38
- Stockton – 38
- Monterey Park – 37
- San Bernardino – 37
- South Gate – 37
- Carson – 36
- Fullerton – 36
- Pasadena – 36
- Santa Clarita – 36
- Clovis – 35
- Orange – 35
- Santa Ana – 35
- South San Francisco – 35
- Yorba Linda – 35
- Oxnard – 34
- Pico Rivera – 34
- Pomona – 34
- Salinas – 34
- Upland – 34
- Carlsbad – 33
- Dublin – 33
- Menifee – 33
- Montebello – 33
- Moreno Valley – 33
- Perris – 33
- San Marcos – 33
- San Ramon – 33
- Fontana – 32
- Glendale – 32
- Redondo Beach – 32
- Tualre – 32
- Cathedral City – 31
- Lake Forest – 31
- Merced – 31
- Ontario – 31
- Palm Desert – 31
- Pleasanton – 31
- Rancho Cucamonga – 31
- Rosemead – 31
- Buena Park – 30
- Chino – 30
- Chino Hills – 30
- Compton – 30
- Long Beach – 30
- Los Angeles – 30
- Porterville – 30
- Redlands – 30
- San Diego – 30
- Santa Monica – 30
- Yucaipa – 30
- Huntington Park – 29
- Lakewood – 29
- Petaluma – 29
- Sacramento – 29
- Tracy – 29
- Victorville – 29
- Arcadia – 28
- Baldwin Park – 28
- Camarillo – 28
- Delano – 28
- Downey – 28
- Encinitas – 28
- Hemet – 28
- Lynwood – 28
- Manteca – 28
- Palmdale – 28
- Placentia -28
- Tustin – 28
- West Covina – 28
- Westminster – 28
- Cerritos – 27
- Costa Mesa – 27
- Fairfield – 27
- Gardena – 27
- Highland – 27
- Huntington Beach – 27
- Newport Beach – 27
- Paramount – 27
- Santa Clara – 27
- Temecula – 27
- Alhambra – 26
- Chula Vista – 26
- Concord – 26
- Escondido – 26
- Glendora – 26
- La Habra – 26
- Mountain View – 26
- Napa – 26
- National City – 26
- Redding – 26
- Simi Valley – 26
- Apple Valley – 25
- Beaumont – 25
- Bellflower – 25
- Davis – 25
- Gilroy – 25
- Santa Maria – 25
- Sunnyvale – 25
- Vacaville – 25
- Ventura – 25
- Whittier – 25
- El Monte – 24
- Fountain Valley – 24
- Pittsburg – 24
- San Rafael – 24
- Santa Cruz – 24
- Burbank – 23
- Colton – 23
- Inglewood – 23
- Lancaster – 23
- Torrance – 23
- Watsonville – 23
- Diamond Bar – 22
- El Cajon – 22
- Elk Grove – 22
- Santa Rosa – 22
- Daly City – 21
- Eastvale – 21
- Mission Viejo – 21
- Murrieta – 21
- Rancho Cordova – 21
- Riverside – 21
- Roseville – 21
- San Clemente – 21
- San Mateo – 21
- Vallejo – 21
- Brentwood – 20
- Fremont – 20
- Hanford – 20
- Hawthorne – 20
- Santee – 20
- Union City – 20
- Antioch – 19
- Hesperia – 19
- Indio – 19
- Milpitas – 19
- Oceanside – 19
- Rocklin – 19
- Vista – 19
- West Sacramento – 19
- Citrus Heights – 18
- Madera – 18
- Novato – 18
- Palo Alto – 18
- Redwood City – 18
- Yuba City – 18
- Aliso Viejo – 17
- Laguna Niguel – 17
- Woodland – 17
- Big Bear Lake – 16
- Cupertino – 16
- Turlock – 16
- Alameda – 14
- Berkeley – 14
- Oakland – 14
- Richmond – 14
- San Leandro – 14
- Walnut Creek – 14
- Folsom – 13
- San Francisco – 13
- Hayward – 12
- La Mesa – 11
Want to See What’s in Each City’s Water Supply?
You can use the Search bar below or click California Water Quality.
We’ll Also Show You How to Clean It Up
It would be terrible if we just told you how bad the water was and didn’t provide a solution.
So we made sure to include information on water filters and their effectiveness.
You will find links to our recommendations on each city’s page as well as the Water Filters page here.