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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
276–300 of 423Canterbury Park
CO0121167 · 1,240 served
The Springs Mhp
CO0121718 · 1,229 served
Town of Julesburg
CO0158001 · 1,225 served
Falcon Area Water and Wastewater
CO0121724 · 1,223 served
Harmony Village Mhp
CO0135333 · 1,215 served
Denver Cascade Mhp
CO0101205 · 1,200 served
Town of Minturn
CO0119510 · 1,200 served
Edgemont Ranch Md
CO0134200 · 1,200 served
Holiday Hills Village
CO0101352 · 1,190 served
Town of Fowler
CO0145210 · 1,169 served
Apple Tree Park
CO0123734 · 1,160 served
Town of Gilcrest
CO0162310 · 1,150 served
Casa Estates Mhp
CO0101167 · 1,117 served
Pine Brook Hills Wd
CO0107610 · 1,100 served
Town of Pierce
CO0162610 · 1,094 served
Stoneybrook Mhp
CO0162725 · 1,073 served
Dallas Creek Wc
CO0146485 · 1,059 served
Northbrook Villas Mhc
CO0143552 · 1,052 served
Falcon Highlands Md
CO0121247 · 1,050 served
Forest Lakes Md
CO0121360 · 1,049 served
Friendly Village of the Rockies
CO0101283 · 1,046 served
Elbert County Hwy 86 Wd
CO0120245 · 1,040 served
Mitchell Cooper Ditch Pipeline
CO0123510 · 1,028 served
Cave Creek
CO0162167 · 1,025 served
Cimarron Village
CO0180175 · 1,010 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