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Colorado Water Hardness

Across the 8 cities we track in Colorado, hardness ranges from 1.27–13.45 GPG, with 3 cities running hard or very hard, and 4 more cities don't publish a figure.

8 cities tracked. View the Colorado hardness map → · Is Colorado water safe to drink? →

Thornton

13.45 GPG · 230 ppm
Very Hard

Pueblo

10.53 GPG · 180 ppm
Very Hard

Westminster

7.72 GPG · 132 ppm
Hard

Centennial

5.2 GPG · 89 ppm
Moderate

Denver

5.2 GPG · 89 ppm
Moderate

Arvada

3.15 GPG · 53.9 ppm
Soft

Boulder

2.4 GPG · 42 ppm
Soft

Longmont

1.27 GPG · 21.7 ppm
Soft

Cities with no published figure

These Colorado cities don't publish a hardness number (it isn't a regulated parameter), so they can't be ranked — but we still track them. See each page for how to check your own tap.

Colorado Springs

Hardness not published
Not Published

Fort Collins

Hardness not published
Not Published

Greeley

Hardness not published
Not Published

Lakewood

Hardness not published
Not Published