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Colorado Water Hardness Map

8 cities · average 6.1 GPG

Average hardness

6.1 GPG

Hardest city

Thornton 13.45 GPG

Softest city

Longmont 1.27 GPG

Map — Colorado cities by hardness

Very HardHardModerateSoft

Tier distribution

Very Hard2Hard1Moderate2Soft3

Cities ranked by hardness

1Thornton13.45 GPGVery Hard2Pueblo10.53 GPGVery Hard3Westminster7.72 GPGHard4Centennial5.2 GPGModerate5Denver5.2 GPGModerate6Arvada3.15 GPGSoft7Boulder2.4 GPGSoft8Longmont1.27 GPGSoft