Colorado water hardness, by utility.

215 Colorado utilities serving 1.9 million people as they report it, from the state’s own results. Hardness is the calcium and magnesium in water; EPA sets no limit for it.

The short answer

Moderately hard water reaches the most people here: 72 utilities serving 1.3 million. Another 6 utilities, serving 4,503, have water in more than one band.

The largest, Denver Water Board, is moderately hard on average, 105 mg/L (6.1 grains per gallon), ranging from 55 to 124 mg/L.

Very hard

Above 180 mg/L (10.5 grains per gallon). 36 utilities serving 32,249 people; the 25 largest are here.

Colorado utilities: very hard water
Utility	Based in	Serves	Hardness, mg/L	Grains per gallon
Security Water District	Colorado Springs	20,000	272	15.9
Woodland Hills Mhc	Thornton	1,740	190	11.1
Eagle River Village MHP	Littleton	1,500	370	21.6
Eastgate Village Manufactured Homes	Farmington	1,500	220	12.9
Apple Tree Park	New Castle	1,160	650	38
Pine Brook Hills WD	Boulder	1,100	229	13.4
San Lazaro Mfctd Housing Community	Lafayette	844	250	14.6
Pueblo Grande Village	Pueblo	504	195	11.4
Mountain View Village West	Bloomfield Hills	440	220	12.9
Mountain Valley MHP	Denver	338	430	25.1
Cavern Springs Mhc, LLC	Glenwood Springs	300	390	22.8
Westside MHP	Durango	236	450	26.3
Dot MHP	Irvine	229	1700	99.4
Roaring Fork MHP	Northbrook	200	220	12.9
Castle Park MHP	Loveland	191	200	11.7
Sans Souci Cooperative	Boulder	150	270	15.8
Security MHP	Stockton	150	300	17.5
Sleepy Bear MHP	Steamboat Springs	150	435	25.4
Spring View Tp	Montrose	145	360	21.1
Green Acres MHP	Eagle	130	680	39.8
Old Homestead MHP	Durango	120	270	15.8
Mountain Meadows	Glenwood Springs	115	975	57
Neighbors of Dreamland MHP	Pueblo	115	195	11.4
Billings MHP	Boise	110	215	12.6
Crystal Valley	Carbondale	100	410	24

All 36 with very hard water

Hard

121 to 180 mg/L (7.1 to 10.5 grains per gallon). 29 utilities serving 550,896 people; the 25 largest are here.

Colorado utilities: hard water
Utility	Based in	Serves	Hardness, mg/L	Grains per gallon
City of Aurora	Aurora	533,407	136	8
Kimberly Hills MHP	Lakewood	2,005	130	7.6
Redwood Estates	Thornton	1,500	165	9.6
The Grove at Alta Ridge	Thornton	1,300	180	10.5
The Springs MHP	Colorado Springs	1,229	140	8.2
Denver Cascade MHP	Wheat Ridge	1,200	140	8.2
Holiday Hills Village	Wheat Ridge	1,190	140	8.2
Casa Estates MHP	Westminster	1,117	140	8.2
Friendly Village of the Rockies	Thornton	1,046	180	10.5
Golden Terrace West	Golden	825	130	7.6
Candlewood Park	Clifton	800	140	8.2
Cottonwood Springs MHP	Rifle	750	180	10.5
Golden Terrace Village	Wheat Ridge	580	130	7.6
Countryside Estates Pueblo	Pueblo	508	180	10.5
Lake Fork MHP	Littleton	487	170	9.9
Mountainside Estates MHP	Lakewood	473	130	7.6
Steamboat Lake WD	Clark	411	170	9.9
The Aspens Mobile Home Village	Centennial	318	140	8.2
Thornton Estates	Thornton	300	180	10.5
Pueblo Pointe Mhc, LLC	Pueblo	289	160	9.4
North Point Estates MHP	Pueblo	271	170	9.9
Vista Verde Village	Cortez	200	140	8.2
Storm King MHP	Windsor	135	170	9.9
Ski Town Village	Almont	113	175	10.2
Chancellors Mhc	Pueblo	100	175	10.2

All 29 with hard water

Moderately hard

61 to 120 mg/L (3.6 to 7 grains per gallon). 72 utilities serving 1.3 million people; the 25 largest are here.

Colorado utilities: moderately hard water
Utility	Based in	Serves	Hardness, mg/L	Grains per gallon
Denver Water Board	Denver	1,287,000	105	6.1
Park Center WD	Canon City	4,000	102	6
Pine Lakes Ranch	Lakewood	1,905	120	7
Friendly Village of Aurora MHP	Lakewood	1,786	66	3.8
Canterbury Park	Colorado Springs	1,240	89	5.2
Northbrook Villas Mhc	Littleton	1,052	110	6.4
Cimarron Village	Wheat Ridge	1,010	100	5.8
Arbordale Acres MHP	Lafayette	901	120	7
Boulder Ridge MHP	Lafayette	897	74	4.3
Countryside Village of Denver	Lakewood	863	120	7
The Meadows	Aurora	758	71	4.1
Woodshire East Mobile Home Park Ltd	Los Angeles	751	87	5.1
Lamplighter MHP	Lakewood	651	120	7
Lamplighter Rhp	Colorado Springs	643	65	3.8
Franklin Mobile Home Park	Littleton	513	110	6.4
El Morro Mobile Estates	Littleton	504	75	4.4
River Meadows the	Montrose	490	90	5.3
Cedar Mountain Village MHP	Cedaredge	475	91	5.3
Cheyenne Mountain Estates MHP	Lafayette	472	71	4.2
Paradise Park MHP	Boise	375	75	4.4
Skylark Mobile Home Community	Lafayette	342	98	5.7
Chaparral Village MHP	Thornton	303	100	5.8
Pagels Tp	Ft Morgan	300	83	4.9
Palmer Lake Mobile Home Ranch	Administrative Contact	268	77	4.5
Applewood Mhc	New York	250	105	6.1

All 72 with moderately hard water

Soft

Up to 60 mg/L (3.5 grains per gallon). 72 utilities serving 35,688 people; the 25 largest are here.

Colorado utilities: soft water
Utility	Based in	Serves	Hardness, mg/L	Grains per gallon
Wikiup MHP	Lakewood	2,500	3.9	0.2
Timber Ridge MHP	Fort Collins	1,736	46	2.7
Boulder Meadows MHP	Windsor	1,657	35	2
Hillcrest Village MHP	Wheat Ridge	1,505	26	1.5
Foxridge Farms MHP	Littleton	1,440	11	0.6
Harmony Village MHP	Lakewood	1,215	47	2.7
Stoneybrook MHP	Lakewood	1,073	26	1.5
Cave Creek	Evans	1,025	49	2.9
Cloverleaf Colorado LLC	Windsor	1,007	29	1.7
Longview MHP	Lakewood	1,000	38	2.2
Poudre Valley Mhc	Aurora	985	47	2.7
Collins Aire Mhc	Aurora	946	29	1.7
Quail Hill Mobile Home Park	Los Angeles	878	32	1.8
Lago Vista Mobile Home Park	Loveland	842	29	1.7
Villa West	Lakewood	833	42	2.5
Hickory Village	Windsor	816	49	2.9
River Valley Mhc	Littleton	803	44	2.6
Countryside of Longmont	Longmont	775	16	0.9
Vista Village MHP	Boulder	750	29	1.7
Friendly Village of Greeley MHP	Lakewood	660	54	3.1
Prairie Greens MHP	Frederick	654	25	1.5
Canyon Ridge	Colorado Springs	625	39	2.3
St Vrain MHP LLC	Longmont	544	21	1.2
Crestline Manor	Colorado Springs	505	33	1.9
Sheridan MHP	Lakewood	480	19	1.1

All 72 with soft water

Varies

Water in more than one band, depending on where or when it was sampled: each is given as its range, softest to hardest, and its report says more. 6 utilities serving 4,503 people, largest first.

Colorado utilities: varies water
Utility	Based in	Serves	Hardness, mg/L	Grains per gallon
El Jebel MHP	El Jebel	1,962	180 to 190	10.5 to 11.1
Front Range	Broomfield	1,620	34 to 70	2 to 4.1
Golden Terrace South	Golden	425	120 to 130	7 to 7.6
Mountain Valley Estates	Leadville	200	180 to 190	10.5 to 11.1
Ridgewood Mobile Home Park	San Francisco	196	120 to 130	7 to 7.6
Durango Jcmhp, LLC	Durango	100	11 to 170	0.6 to 9.9

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.

Very hard

Hard

Moderately hard

Soft

Varies

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