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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
301–325 of 423Cloverleaf Colorado Llc
CO0135184 · 1,007 served
Town of Log Lane Village
CO0144015 · 1,006 served
Longview Mhp
CO0107384 · 1,000 served
Byers Wsd
CO0103010 · 1,000 served
Town of Ridgway
CO0146676 · 1,000 served
Mile Hi Water Inc Hauler
CO0107510 · 1,000 served
Homestead Wc
CO0130050 · 1,000 served
Consolidated Bell Mtn Ranch Md
CO0118002 · 1,000 served
North Lincoln Wsd
CO0116552 · 1,000 served
Brook Forest Wd
CO0130010 · 998 served
Poudre Valley Mhc
CO0135627 · 985 served
Town of Antonito
CO0111100 · 981 served
Town of Manassa
CO0111700 · 976 served
Town of Haxtun
CO0148001 · 963 served
Town of Stratton
CO0132020 · 960 served
Town of Oak Creek
CO0154566 · 950 served
Collins Aire Mhc
CO0135186 · 946 served
Park Forest
CO0121600 · 930 served
Durango West Md No 2
CO0134190 · 930 served
Town of Debeque
CO0139205 · 911 served
Kiowa Water and Wastewater Authority
CO0120015 · 910 served
Town of Fairplay
CO0147020 · 909 served
Arbordale Acres Mhp
CO0107118 · 901 served
Bents Fort Wc
CO0145060 · 900 served
Rmnp Headquarters East
CO0135685 · 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