Water Hardness Colorado
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Water Hardness Colorado

Here are the water hardness values for the cities in Colorado.
City AVG Hardness PPM / mg/L AVG Hardness Grains per Gallon
Aurora 132 7.8
Arvada 158 9
Boulder 40.5 2.4
Broomfield 83 4.9
Castle Rock 152 8.9
Centennial 205 12
Colorado Springs 112.5 6.6
Commerce City 276 16.2
Denver 97.5 5.8
Durango  89 5
Fort Collins 111 6
Longmont 20 1.2
Loveland 22 1.3
Pueblo 117 6.9
Thornton 196 11.5
Westminster 117.5 6.9