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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
126–150 of 423City of Manitou Springs
CO0121450 · 6,938 served
City of Dacono
CO0162200 · 6,900 served
Town of Carbondale
CO0123167 · 6,700 served
Winter Park Wsd
CO0125843 · 6,635 served
Town of Lochbuie
CO0162486 · 6,518 served
Stratmoor Hills Wsd
CO0121800 · 6,500 served
Donala Wsd
CO0121175 · 6,421 served
Snowmass Village Wsd
CO0149717 · 6,353 served
Northern Douglas County Wsd
CO0118016 · 6,160 served
City of Lakewood
CO0130467 · 6,000 served
Copper Mountain Consolidated Md
CO0159030 · 5,785 served
Town of Monument
CO0121475 · 5,740 served
Triview Md
CO0121840 · 5,737 served
City of Salida
CO0108700 · 5,666 served
Castle Pines Village Md
CO0118005 · 5,656 served
Grand County Water No 1
CO0125323 · 5,400 served
Town of Georgetown
CO0110015 · 5,315 served
City of Edgewater
CO0130237 · 5,300 served
City of Brush
CO0144001 · 5,122 served
Town of Limon
CO0137015 · 5,080 served
Town of New Castle
CO0123538 · 5,024 served
Paint Brush Hills
CO0221690 · 4,994 served
Northern Colorado Wa
CO0135554 · 4,675 served
Town of Keenesburg
CO0162438 · 4,650 served
City of Monte Vista
CO0153600 · 4,600 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