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California Water Hardness

10 cities · average 9.7 GPG

Average hardness

9.7 GPG

Hardest city

Bakersfield 15.1 GPG

Softest city

San Francisco 1.5 GPG

Tier distribution

Very Hard4Hard4Soft2

Cities ranked by hardness

1Bakersfield15.1 GPGVery Hard2Visalia13.7 GPGVery Hard3Riverside13.4 GPGVery Hard4San Bernardino12.9 GPGVery Hard5Fresno10.5 GPGHard6Modesto10.4 GPGHard7Stockton9.2 GPGHard8Sacramento8 GPGHard9Oakland2 GPGSoft10San Francisco1.5 GPGSoft