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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
151–175 of 423Mid Valley Md
CO0119508 · 4,588 served
Town of Elizabeth
CO0120010 · 4,523 served
Menoken Wd
CO0143506 · 4,500 served
Town of Frisco
CO0159055 · 4,495 served
City of Rocky Ford
CO0145600 · 4,443 served
City of Glendale
CO0103055 · 4,400 served
Town of Bennett
CO0101020 · 4,400 served
Town of Ault
CO0162125 · 4,220 served
Battlement Mesa Md
CO0123133 · 4,100 served
City of Yuma
CO0163020 · 4,049 served
Park Center Wd
CO0122600 · 4,000 served
High View Wd
CO0130344 · 4,000 served
West Fort Collins Wd
CO0135290 · 4,000 served
Town of Hayden
CO0154333 · 3,982 served
Genesee Wsd
CO0130035 · 3,920 served
Perry Park Wsd
CO0118045 · 3,890 served
Chipeta Wd
CO0143176 · 3,802 served
Town of Buena Vista
CO0108300 · 3,776 served
City of Central City
CO0124171 · 3,750 served
Ymca Rockies Wind River
CO0135883 · 3,730 served
City of Burlington
CO0132005 · 3,720 served
Colorado Centre Md
CO0121140 · 3,675 served
Town of Silt
CO0123710 · 3,536 served
Advenir French Quarter
CO0116104 · 3,447 served
Town of Hudson
CO0162359 · 3,350 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