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South Dakota Water Hardness

2 cities · average 12.5 GPG

Average hardness

12.5 GPG

Hardest city

Sioux Falls 13.8 GPG

Softest city

Rapid City 11.2 GPG

Tier distribution

Very Hard1Hard1

Cities ranked by hardness

1Sioux Falls13.8 GPGVery Hard 2Rapid City11.2 GPGHard