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Iowa Water Hardness Map

5 cities · average 13.1 GPG

Average hardness

13.1 GPG

Hardest city

Sioux City 26.3 GPG

Softest city

Iowa City 6.29 GPG

Map — Iowa cities by hardness

Very HardHardModerateSoft

Tier distribution

Very Hard2Hard1Moderate2

Cities ranked by hardness

1Sioux City26.3 GPGVery Hard2Waterloo19.4 GPGVery Hard3Des Moines7 GPGHard4Cedar Rapids6.75 GPGModerate5Iowa City6.29 GPGModerate