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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
326–350 of 423Garden Valley
CO0121325 · 900 served
Bow Mar Wsd
CO0103153 · 899 served
Boulder Ridge Mhp
CO0107153 · 897 served
Two Rivers Village
CO0119720 · 896 served
Midlands Village
CO0139510 · 893 served
Town of Hugo
CO0137010 · 885 served
Quail Hill Mobile Home Park
CO0121633 · 878 served
San Juan River Village Md
CO0104900 · 877 served
Town of Nucla
CO0143559 · 875 served
Highland Lakes Wd
CO0160200 · 875 served
Countryside Village of Denver
CO0101185 · 863 served
Roxborough Nw Douglas County
CO0118070 · 860 served
Town of La Veta
CO0128500 · 850 served
Piedra Park Md
CO0104700 · 850 served
Town of Dove Creek
CO0117300 · 850 served
Town of Sanford
CO0111900 · 850 served
San Lazaro Mfctd Housing Community
CO0107701 · 844 served
Columbine Lakes Hoa
CO0103183 · 843 served
Lago Vista Mobile Home Park
CO0135428 · 842 served
Town of Cheyenne Wells
CO0109006 · 840 served
Rogers Mesa Wc
CO0115685 · 840 served
Villa West
CO0162809 · 833 served
Town of La Jara
CO0111600 · 825 served
Golden Terrace West
CO0130319 · 825 served
Baseline Wd
CO0107135 · 820 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