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Colorado utilities with very hard water.

Above 180 mg/L (10.5 grains per gallon). 36 utilities serving 32,249 people as they report it, largest first.

All 36, by people served

Colorado utilities with very hard water, 1 to 36
UtilityBased inServesHardness, mg/LGrains per gallon
Security Water DistrictColorado Springs20,00027215.9
Woodland Hills MhcThornton1,74019011.1
Eagle River Village MHPLittleton1,50037021.6
Eastgate Village Manufactured HomesFarmington1,50022012.9
Apple Tree ParkNew Castle1,16065038
Pine Brook Hills WDBoulder1,10022913.4
San Lazaro Mfctd Housing CommunityLafayette84425014.6
Pueblo Grande VillagePueblo50419511.4
Mountain View Village WestBloomfield Hills44022012.9
Mountain Valley MHPDenver33843025.1
Cavern Springs Mhc, LLCGlenwood Springs30039022.8
Westside MHPDurango23645026.3
Dot MHPIrvine229170099.4
Roaring Fork MHPNorthbrook20022012.9
Castle Park MHPLoveland19120011.7
Sans Souci CooperativeBoulder15027015.8
Security MHPStockton15030017.5
Sleepy Bear MHPSteamboat Springs15043525.4
Spring View TpMontrose14536021.1
Green Acres MHPEagle13068039.8
Old Homestead MHPDurango12027015.8
Mountain MeadowsGlenwood Springs11597557
Neighbors of Dreamland MHPPueblo11519511.4
Billings MHPBoise11021512.6
Crystal ValleyCarbondale10041024
Millard Mobile Home ParkMontrose9055032.2
Alpine Village MHPEnglewood8021012.3
El Rocko MHPGlenwood Springs8032018.7
Brighton Village LLCWindsor7719011.1
Table Mesa Village MHPWheat Ridge7544526
Town of Two ButtesTwo Buttes6441424.2
Sunrise Trailer ParkMontrose6042024.6
Valli Hi MHPDenver5051530.1
Eastside MHPSalida4022012.9
Triangle TpDurango3935520.8
Arapahoe MHPDumont2720011.7

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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