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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
251–275 of 423Lake Durango Wa
CO0134530 · 1,577 served
Hillcrest Village Mhp
CO0101085 · 1,505 served
Redwood Estates
CO0101667 · 1,500 served
May Valley Wa
CO0150800 · 1,500 served
Eagle River Village Mhp
CO0119234 · 1,500 served
Eastgate Village Manufactured Homes
CO0101034 · 1,500 served
Walden Wsd
CO0121850 · 1,500 served
Town of Poncha Springs
CO0108650 · 1,467 served
City of Ouray
CO0146588 · 1,460 served
East Alamosa
CO0102200 · 1,453 served
Steamboat Ii Md
CO0154724 · 1,450 served
Foxridge Farms Mhp
CO0103050 · 1,440 served
Town of Del Norte
CO0153200 · 1,429 served
Town of Mancos
CO0142700 · 1,390 served
Town of Springfield
CO0105500 · 1,378 served
Lookout Mountain Wd
CO0110026 · 1,378 served
Purgatory Md
CO0134750 · 1,364 served
Town of Parachute
CO0123602 · 1,320 served
Town of Ordway
CO0113700 · 1,300 served
Wigwam Mutual Wc
CO0121470 · 1,300 served
Indian Hills Wd
CO0130065 · 1,300 served
The Grove at Alta Ridge
CO0101320 · 1,300 served
Mancos Rural Water Company
CO0142600 · 1,300 served
Limon Correctional Facility
CO0137016 · 1,289 served
Greatrock North Wsd
CO0101063 · 1,250 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.
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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