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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
351–375 of 423Hickory Village
CO0135343 · 816 served
River Valley Mhc
CO0162677 · 803 served
Town of Holly
CO0150600 · 800 served
Gunnison County Wsd
CO0126220 · 800 served
Town of Ignacio
CO0134500 · 800 served
Candlewood Park
CO0139166 · 800 served
Sage Wua
CO0121745 · 800 served
Morrison Creek Metro District
CO0154518 · 800 served
Deer Creek Wd
CO0120246 · 792 served
Town of Calhan
CO0121075 · 780 served
Countryside of Longmont
CO0107184 · 775 served
Town of Williamsburg
CO0122950 · 775 served
Forest View Acres Wd
CO0121250 · 772 served
Mcdonald Farms Enterprises Inc
CO0207500 · 772 served
The Meadows
CO0103504 · 758 served
Woodshire East Mobile Home Park Ltd
CO0103853 · 751 served
Durango West Md No 1
CO0134180 · 750 served
Vista Village Mhp
CO0107810 · 750 served
Elbert Creek Water Co
CO0134840 · 750 served
Cottonwood Springs Mhp
CO0123185 · 750 served
Academy Wsd
CO0121025 · 750 served
Town of Rye
CO0151700 · 745 served
Pinewood Springs Wd
CO0135610 · 745 served
Mt Vernon Country Club
CO0130090 · 734 served
Colorado Mtn College Svc
CO0123170 · 715 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