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Wisconsin Water Hardness Map

6 cities · average 9.8 GPG

Average hardness

9.8 GPG

Hardest city

Madison 19 GPG

Softest city

Green Bay 7.6 GPG

Map — Wisconsin cities by hardness

Very HardHardModerateSoft

Tier distribution

Very Hard1Hard5

Cities ranked by hardness

1Madison19 GPGVery Hard2Kenosha8.3 GPGHard3Racine8.19 GPGHard4Milwaukee8.01 GPGHard5Waukesha8 GPGHard6Green Bay7.6 GPGHard