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California Water Hardness Map
78 cities · average 10.7 GPG
Average hardness
10.7 GPG
Hardest city
Oxnard 31.6 GPG
Softest city
Berkeley 1.35 GPG
Map — California cities by hardness
Very HardHardModerateSoft
Tier distribution
Very Hard36Hard18Moderate22Soft2
Cities ranked by hardness
1Oxnard31.6 GPGVery Hard2Ventura25.6 GPGVery Hard3Santa Maria22.7 GPGVery Hard4Glendale21 GPGVery Hard5Fullerton19.5 GPGVery Hard6Garden Grove18.5 GPGVery Hard7Norwalk18.1 GPGVery Hard8Orange18 GPGVery Hard9Anaheim16.84 GPGVery Hard10San Jose16.8 GPGVery Hard11Burbank16.6 GPGVery Hard12Santa Clarita16.3 GPGVery Hard13San Diego16.1 GPGVery Hard14Downey15.7 GPGVery Hard15El Monte15.6 GPGVery Hard16Tracy15.4 GPGVery Hard17East Los Angeles15.1 GPGVery Hard18Salinas14.9 GPGVery Hard19Inglewood14.7 GPGVery Hard20Santa Ana14.6 GPGVery Hard21Pomona14.4 GPGVery Hard22Santa Clara14.4 GPGVery Hard23San Bernardino14.2 GPGVery Hard24Stockton13.7 GPGVery Hard25Irvine13.5 GPGVery Hard26Murrieta13.4 GPGVery Hard27Pasadena12.9 GPGVery Hard28West Covina12.6 GPGVery Hard29El Cajon12.5 GPGVery Hard30Simi Valley12.28 GPGVery Hard31Los Angeles11.6 GPGVery Hard32Riverside11.5 GPGVery Hard33Chula Vista11.29 GPGVery Hard34Oceanside11.1 GPGVery Hard35Escondido11 GPGVery Hard36Modesto10.8 GPGVery Hard37Vacaville10.4 GPGHard38Huntington Beach9.5 GPGHard39Jurupa Valley9.5 GPGHard40Rialto9.4 GPGHard41Fairfield9.2 GPGHard42Ontario9.1 GPGHard43Vallejo8.9 GPGHard44Temecula8.8 GPGHard45Long Beach8.7 GPGHard46Corona8.5 GPGHard47Elk Grove8.2 GPGHard48Thousand Oaks8.2 GPGHard49Citrus Heights8.04 GPGHard50Fontana7.6 GPGHard51Fresno7.5 GPGHard52Rancho Cucamonga7.4 GPGHard53Chico7.13 GPGHard54Clovis7.02 GPGHard55Costa Mesa6.61 GPGModerate56Palmdale6.5 GPGModerate57Santa Rosa6.5 GPGModerate58Sunnyvale6.5 GPGModerate59Menifee6.3 GPGModerate60Moreno Valley6.3 GPGModerate61Lancaster5.9 GPGModerate62Fremont5.6 GPGModerate63Roseville5.6 GPGModerate64Bakersfield5.38 GPGModerate65Sacramento4.9 GPGModerate66Richmond4.8 GPGModerate67Hesperia4.4 GPGModerate68Antioch4.33 GPGModerate69Concord4.33 GPGModerate70Victorville4.2 GPGModerate71Visalia4.2 GPGModerate72Oakland3.7 GPGModerate73Daly City3.63 GPGModerate74Carlsbad3.53 GPGModerate75San Francisco3.5 GPGModerate76San Mateo3.5 GPGModerate77Hayward3.3 GPGSoft78Berkeley1.35 GPGSoft