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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
51–75 of 423Crestview Wsd
CO0101040 · 23,756 served
Town of Windsor
CO0162843 · 23,500 served
Meridian Md
CO0218015 · 23,415 served
Cherry Creek Valley Wsd
CO0116175 · 22,000 served
City of Louisville
CO0107487 · 20,975 served
Tri County Wcd
CO0143755 · 20,490 served
Left Hand Wd
CO0107471 · 20,280 served
Security Water District
CO0121775 · 20,000 served
Wheat Ridge Water District
CO0130842 · 20,000 served
Platte Canyon Wsd
CO0103614 · 19,485 served
City of Evans
CO0162260 · 19,369 served
City of Montrose
CO0143518 · 19,305 served
Willows Wd
CO0103100 · 19,000 served
Mt Werner Wd
CO0154524 · 19,000 served
Woodmoor Wsd
CO0121950 · 18,031 served
Superior Md No 1
CO0107725 · 17,900 served
Town of Frederick
CO0162288 · 17,173 served
Us Air Force Academy
CO0121845 · 16,876 served
Town of Estes Park
CO0135257 · 16,722 served
North Weld County Wd
CO0162553 · 15,890 served
Evergreen Md
CO0130030 · 15,750 served
Stonegate Md
CO0118076 · 15,295 served
Town of Gypsum
CO0119329 · 15,272 served
City of Black Hawk
CO0124147 · 15,167 served
City of Sterling
CO0138045 · 15,100 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