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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
401–423 of 423Kv Hoa Inc
CO0155700 · 580 served
Ymca Snow Mtn Ranch
CO0125916 · 578 served
Divide Water Providers Inc
CO0160195 · 570 served
Independence Wsd
CO0120384 · 567 served
Town of South Fork West Municipal
CO0253718 · 566 served
Tabernash Meadows Wsd
CO0125720 · 564 served
Costilla County Ws
CO0112300 · 561 served
Cimarron Creek
CO0143177 · 560 served
St Vrain Mhp Llc
CO0107724 · 544 served
Crowley County Wa
CO0113100 · 530 served
Elkhorn Ranch Md No 1
CO0120244 · 530 served
Smith Creek Crossing
CO0125716 · 518 served
Brush Creek Wd
CO0149155 · 516 served
Town of Granada
CO0150300 · 515 served
Franklin Mobile Home Park
CO0101288 · 513 served
La Plata Archuleta Water District
CO0134191 · 510 served
Crestline Manor
CO0121188 · 505 served
Town of Saguache
CO0155800 · 504 served
Town of Rockvale
CO0122800 · 504 served
El Morro Mobile Estates
CO0121246 · 504 served
Pueblo Grande Village
CO0151608 · 504 served
Countryside Estates Mhc
CO0151186 · 502 served
Town of Empire
CO0110010 · 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
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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