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Colorado utilities with hard water.

121 to 180 mg/L (7.1 to 10.5 grains per gallon). 29 utilities serving 550,896 people as they report it, largest first.

All 29, by people served

Colorado utilities with hard water, 1 to 29
UtilityBased inServesHardness, mg/LGrains per gallon
City of AuroraAurora533,4071368
Kimberly Hills MHPLakewood2,0051307.6
Redwood EstatesThornton1,5001659.6
The Grove at Alta RidgeThornton1,30018010.5
The Springs MHPColorado Springs1,2291408.2
Denver Cascade MHPWheat Ridge1,2001408.2
Holiday Hills VillageWheat Ridge1,1901408.2
Casa Estates MHPWestminster1,1171408.2
Friendly Village of the RockiesThornton1,04618010.5
Golden Terrace WestGolden8251307.6
Candlewood ParkClifton8001408.2
Cottonwood Springs MHPRifle75018010.5
Golden Terrace VillageWheat Ridge5801307.6
Countryside Estates PuebloPueblo50818010.5
Lake Fork MHPLittleton4871709.9
Mountainside Estates MHPLakewood4731307.6
Steamboat Lake WDClark4111709.9
The Aspens Mobile Home VillageCentennial3181408.2
Thornton EstatesThornton30018010.5
Pueblo Pointe Mhc, LLCPueblo2891609.4
North Point Estates MHPPueblo2711709.9
Vista Verde VillageCortez2001408.2
Storm King MHPWindsor1351709.9
Ski Town VillageAlmont11317510.2
Chancellors MhcPueblo10017510.2
Crest Mobile Estates MHPPrairie Village10018010.5
Neighbors of 7th Street MHPCortez961408.2
Excell Lawson VillageDenver9018010.5
Mountain Shadows MHPFountain561609.4

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.

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