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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
101–125 of 423Town of Morrison
CO0130085 · 9,887 served
Town of Mountain Village
CO0157400 · 9,700 served
St Charles Mesa Wd
CO0151750 · 9,690 served
City of Gunnison
CO0126325 · 9,610 served
City of Rifle
CO0123676 · 9,489 served
City of Glenwood Springs
CO0123314 · 9,428 served
Willowbrook Wsd
CO0130843 · 9,348 served
Cherry Creek Village Wd
CO0103176 · 9,215 served
Town of Milliken
CO0162511 · 9,200 served
City of Craig
CO0141188 · 8,930 served
City of Cortez
CO0142200 · 8,770 served
City of Delta
CO0115205 · 8,700 served
City of Woodland Park
CO0160900 · 8,500 served
Town of Silverthorne
CO0159095 · 8,414 served
City of La Junta
CO0145420 · 8,320 served
Inverness Wsd
CO0203012 · 8,140 served
Morgan County Quality Wd
CO0144020 · 8,116 served
Town of Telluride
CO0157800 · 7,900 served
Central Weld Cnty Wd
CO0162122 · 7,662 served
Town of Eagle
CO0119233 · 7,511 served
Parkville Wd
CO0133700 · 7,500 served
City of Florence
CO0122500 · 7,500 served
City of Lamar
CO0150700 · 7,500 served
Town of Eaton
CO0162233 · 7,328 served
Todd Creek Village Md
CO0101157 · 7,202 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