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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
76–100 of 423North Washington Street Wsd
CO0101105 · 14,500 served
Town of Berthoud
CO0135138 · 14,211 served
Woodmen Hills Md
CO0121930 · 13,888 served
Montezuma Wc
CO0142900 · 13,797 served
Roxborough Wsd
CO0118055 · 13,765 served
Pinery Wwd
CO0118025 · 12,901 served
Castle Pines North Md
CO0118006 · 12,800 served
Meridian Service Md
CO0121455 · 12,760 served
City of Ft Lupton
CO0162291 · 12,099 served
Lakehurst Wsd
CO0130466 · 12,000 served
Ken Caryl Wsd
CO0103075 · 12,000 served
City of Ft Morgan
CO0144005 · 12,000 served
Town of Severance
CO0162707 · 11,733 served
Town of Wellington
CO0135838 · 11,720 served
City of Federal Heights
CO0101055 · 11,678 served
City of Trinidad
CO0136800 · 11,400 served
Sterling Ranch Cab
CO0118724 · 11,357 served
City of Alamosa
CO0102100 · 11,271 served
Pagosa Area Wsd
CO0104300 · 11,069 served
Cottonwood Wsd
CO0118020 · 10,867 served
City of Idaho Springs
CO0110020 · 10,432 served
North Table Mountain Wsd
CO0130105 · 10,000 served
Valley Wd
CO0130800 · 10,000 served
City of Steamboat Springs
CO0154725 · 9,950 served
Snake River Wd
CO0159105 · 9,900 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