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Colorado Water Quality
423
Utilities in database
7.1M
Residents served
25%
On private wells
3
Key contaminants tracked
Drinking Water in Colorado
Colorado has 423 community water systems serving approximately 7.1 million residents. Primary water sources include surface water. The most commonly reported contaminants include disinfection byproducts, lead, arsenic. 25% of Colorado residents rely on private wells. CDPHE holds primary enforcement authority under the Safe Drinking Water Act.
Utilities in Colorado
226–250 of 423Baca Grande Wsd
CO0155200 · 2,006 served
Kimberly Hills Mhp
CO0101443 · 2,005 served
Crested Butte South
CO0126189 · 2,000 served
City of Creede
CO0140500 · 1,965 served
El Jebel Mhp
CO0119246 · 1,962 served
Round Mountain Wsd
CO0114500 · 1,950 served
Mountain Wsd
CO0130100 · 1,941 served
Roaring Fork Wsd
CO0123125 · 1,912 served
Town of Wiggins
CO0144035 · 1,909 served
Pine Lakes Ranch
CO0101610 · 1,905 served
Town of Kremmling
CO0125455 · 1,859 served
Spring Valley Md No 1
CO0120717 · 1,788 served
Friendly Village of Aurora Mhp
CO0101287 · 1,786 served
Woodland Hills Mhc
CO0101833 · 1,740 served
Timber Ridge Mhp
CO0135742 · 1,736 served
Aristocrat Ranchette Water Project
CO0162121 · 1,715 served
Buena Vista Correctional Facility
CO0108350 · 1,700 served
Norwood Water Commission
CO0157500 · 1,700 served
Forest Lakes Md
CO0134360 · 1,699 served
Boulder Meadows Mhp
CO0107179 · 1,657 served
Town of Deer Trail
CO0103030 · 1,648 served
Town of Dolores
CO0142400 · 1,626 served
Front Range
CO0180288 · 1,620 served
Avondale Wsd
CO0151050 · 1,615 served
Ralston Valley Wsd
CO0130667 · 1,610 served
Key Contaminant Concerns in Colorado
Lead
Lead is a naturally occurring heavy metal that was widely used in plumbing infrastructure until it was banned for new installations in 1986. An estimated 9.2 million lead service lines still connect homes to public water mains across the United States, along with millions of homes with lead solder in their internal plumbing.
DBPs
When utilities add chlorine to water to kill pathogens, it reacts with dissolved organic matter — leaves, algae, soil — to produce disinfection byproducts (DBPs). Over 600 DBPs have been identified. The EPA regulates two groups: total trihalomethanes (TTHMs, including chloroform) and haloacetic acids (HAA5). DBP levels tend to be highest in surface water systems and in warm months when organic matter is elevated.
Arsenic
Arsenic (As) occurs naturally in rock and soil, dissolving into groundwater through natural weathering processes. Inorganic arsenic — the form found in drinking water — is a known human carcinogen. The western United States has particularly arsenic-rich geological formations, but elevated levels have been found in 48 states. Arsenic is tasteless and odorless.
Colorado Water FAQs
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Data source: Utility data from EPA SDWIS. 423 active community water systems ingested. CCR contaminant data ingestion in progress.
Last updated: 2026-04-18