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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
376–400 of 423Mile High Wc
CO0101510 · 700 served
Town of Hot Sulphur Springs
CO0125352 · 687 served
Divide Mpc Md No 1
CO0160295 · 679 served
Town of Collbran
CO0139185 · 678 served
Mountain Mutual Wa
CO0160350 · 674 served
Keystone Ranch
CO0159065 · 670 served
Hoover Hills Wsd
CO0107352 · 662 served
Town of Swink
CO0145720 · 660 served
Friendly Village of Greeley Mhp
CO0162275 · 660 served
Town of Eads
CO0131400 · 656 served
El Moro Hoehne Pipeline Assoc
CO0136249 · 655 served
Prairie Greens Mhp
CO0162621 · 654 served
Lamplighter Mhp
CO0101467 · 651 served
Town of Walsh
CO0105900 · 650 served
Lamplighter Rhp
CO0121488 · 643 served
San Luis Wsd
CO0112900 · 629 served
Canyon Ridge
CO0121168 · 625 served
South Swink Water Authority
CO0145690 · 622 served
Town of Simla
CO0120025 · 618 served
Town of Otis
CO0161010 · 600 served
Town of Walden
CO0129834 · 600 served
Teller County Wsd
CO0160600 · 600 served
Town of Lake City
CO0127467 · 587 served
Town of Naturita
CO0143533 · 585 served
Golden Terrace Village
CO0130317 · 580 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