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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
201–225 of 423Town of Paonia
CO0115601 · 2,499 served
Town of Rangely
CO0152666 · 2,495 served
Rangeview Md
CO0103666 · 2,487 served
Eastern Adams Co Md
CO0101234 · 2,485 served
Alameda Wsd
CO0130116 · 2,480 served
Town of Meeker
CO0152505 · 2,473 served
Town of Crested Butte
CO0126188 · 2,440 served
Town of Nederland
CO0107538 · 2,406 served
Town of Cedaredge
CO0115171 · 2,400 served
Town of Silverton
CO0156600 · 2,387 served
Town of Akron
CO0161001 · 2,379 served
Town of Basalt
CO0119134 · 2,357 served
City of Wray
CO0163010 · 2,342 served
Spring Canyon Wsd
CO0135721 · 2,320 served
Town of Bayfield
CO0134030 · 2,300 served
Granby Town of South Service Area
CO0125710 · 2,300 served
Town of Flagler
CO0132010 · 2,160 served
Town of Fraser
CO0125288 · 2,150 served
City of Las Animas
CO0106300 · 2,139 served
Kersey Wd
CO0162439 · 2,101 served
Strasburg Wsd
CO0101145 · 2,050 served
Town of Hotchkiss
CO0115352 · 2,050 served
Town of Grand Lake
CO0125322 · 2,035 served
Granby Town of North Service Area
CO0125321 · 2,025 served
Town of La Salle
CO0162466 · 2,010 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