Colorado utilities with moderately hard water.
61 to 120 mg/L (3.6 to 7 grains per gallon). 72 utilities serving 1.3 million people as they report it, largest first.
All 72, by people served
Source: Colorado Department of Public Health and Environment, Water Quality Control Division, 213 utilities, results from Jan. 6, 2016 to Sept. 16, 2026, read Oct. 17, 2026. Each sampling point is taken at its median; a figure is typical where every point falls in one band.
Also: 2 utilities’ own water quality reports, read by hand, each named on the utility’s page.
Bands are the U.S. Geological Survey’s, at 17.1 mg/L to the grain. People served is what each utility reports; where one sells water to another, the same people can be counted twice. How hardness is measured here.
Where to go next
- Colorado hardnessEvery band in the state, with the largest utilities in each.Colorado water hardness
- Softeners comparedCertified softeners and what each costs over five years, salt included, at your water’s hardness.Softeners, salt included
- Hardness across the USEvery state with hardness results, and the hardest and softest large utilities.US water hardness