Water hardness
Denver, CO water hardness
Denver's tap water measures 89 ppm, which is moderately hard. The number comes from Denver Water's 2025 published data, measured at the tap.
89 ppm
Moderately hard
Denver shower water
Hardness bands per the U.S. Geological Survey. Range: 48 to 116 ppm across service areas.
89
Source: Denver Water, 2025.
For comparison, Saint Paul, MN sits in the same range at 90 ppm.
What Denver Water Means for Hair and Skin
Between 61 and 120 ppm, effects are mild and many people never notice them. If your fixtures stay clean and soap behaves, this level is not worth treating.
Check Your Own Zip Code
Check the number for your exact address with the free zip lookup, or read the utility's own report linked above.