State Hub
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
176–200 of 423Mount Crested Butte Wsd
CO0126190 · 3,296 served
Meadowbrook Wd
CO0130500 · 3,290 served
Town of Dillon
CO0159035 · 3,254 served
Winter Park Ranch Wsd
CO0125844 · 3,250 served
City of Walsenburg
CO0128900 · 3,230 served
Longs Peak Wd
CO0107486 · 3,200 served
Penrose Wd
CO0122700 · 3,149 served
Town of Orchard City
CO0115588 · 3,100 served
Animas Wc
CO0134020 · 3,096 served
Dillon Valley District
CO0159040 · 3,063 served
Town of Palisade
CO0139600 · 3,060 served
Town of Olathe
CO0143582 · 3,015 served
Town of Lyons
CO0107496 · 2,990 served
Town of Platteville
CO0162615 · 2,900 served
City of Cripple Creek
CO0160100 · 2,817 served
Upper Surface Creek Domestic Wua
CO0115784 · 2,800 served
Colorado City Md
CO0151200 · 2,755 served
Town of Palmer Lake
CO0121575 · 2,686 served
Buffalo Mountain Md
CO0159025 · 2,650 served
Town of Center
CO0155500 · 2,575 served
City of Holyoke
CO0148005 · 2,540 served
East Dillon Wd
CO0159045 · 2,501 served
North Pecos Wsd
CO0116553 · 2,500 served
South Sheridan Water and Sewer Dist
CO0130718 · 2,500 served
Wikiup Mhp
CO0101180 · 2,500 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
Quick Links
Data source: Utility data from EPA SDWIS. 423 active community water systems ingested. CCR contaminant data ingestion in progress.
Last updated: 2026-04-18