State Hub
Colorado Water Quality
423
Utilities in database
7.1M
Residents served
0
With open violations
154
PFAS monitored
Quick Answer
Colorado public drinking water is served by 423 EPA-tracked water systems, providing service to approximately 7.1 million residents through public utilities. No open health-based violations are currently recorded across tracked systems in the EPA federal database. 154 systems have official PFAS monitoring records from the EPA UCMR 5 program (2023–2025). About 25% of CO residents use private wells, which fall outside federal utility compliance monitoring.
No open health-based violations are currently recorded in the EPA SDWIS database for Colorado's tracked water systems. Always verify with your utility's Consumer Confidence Report for annual test results.
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.
Safest Large Utilities
Colorado systems with no open health violations serving 10,000+ residents.
Utilities in Colorado
226–250 of 423Baca Grande Wsd
CO0155200 · 2,006 served
Kimberly Hills Mhp
CO0101443 · 2,005 served
Crested Butte South
CO0126189 · 2,000 served
City of Creede
CO0140500 · 1,965 served
El Jebel Mhp
CO0119246 · 1,962 served
Round Mountain Wsd
CO0114500 · 1,950 served
Mountain Wsd
CO0130100 · 1,941 served
Roaring Fork Wsd
CO0123125 · 1,912 served
Town of Wiggins
CO0144035 · 1,909 served
Pine Lakes Ranch
CO0101610 · 1,905 served
Town of Kremmling
CO0125455 · 1,859 served
Spring Valley Md No 1
CO0120717 · 1,788 served
Friendly Village of Aurora Mhp
CO0101287 · 1,786 served
Woodland Hills Mhc
CO0101833 · 1,740 served
Timber Ridge Mhp
CO0135742 · 1,736 served
Aristocrat Ranchette Water Project
CO0162121 · 1,715 served
Buena Vista Correctional Facility
CO0108350 · 1,700 served
Norwood Water Commission
CO0157500 · 1,700 served
Forest Lakes Md
CO0134360 · 1,699 served
Boulder Meadows Mhp
CO0107179 · 1,657 served
Town of Deer Trail
CO0103030 · 1,648 served
Town of Dolores
CO0142400 · 1,626 served
Front Range
CO0180288 · 1,620 served
Avondale Wsd
CO0151050 · 1,615 served
Ralston Valley Wsd
CO0130667 · 1,610 served
Key Contaminant Concerns in Colorado
These contaminants appear most frequently in Colorado utility records or pose elevated risk in this region based on EPA data.
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. Critically, a utility's water quality report can show zero detected lead at the treatment plant while your specific tap still delivers elevated lead — because the contamination happens inside the distribution system and your home's plumbing, not at the source.
EPA limit: 15 ppb (action level)
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.
EPA limit: 80 µg/L (TTHMs) / 60 µg/L (HAA5)
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.
EPA limit: 10 ppb
City Water Reports in Colorado
Tap water quality pages for Colorado cities — violations, PFAS records, utility profiles, and official source links.
Independent Water Testing
Find a certified lab in Colorado
Utility compliance records show what water systems report to the EPA. An independent test from a certified laboratory confirms what's actually in your tap water. Colorado labs can test for PFAS, lead, nitrates, bacteria, and dozens of other contaminants.
Explore Water Quality in Colorado
Baca Grande Wsd
Violation history, PFAS records, and official source links
Kimberly Hills Mhp
Violation history, PFAS records, and official source links
Crested Butte South
Violation history, PFAS records, and official source links
PFAS monitoring records — Colorado
154 water systems in Colorado with EPA UCMR 5 records
Lead in Colorado drinking water
State-specific lead data, violation utilities, and testing guidance
PFAS in Colorado drinking water
State-specific PFAS data, MCL context, and treatment options
Certified water testing labs in Colorado
Labs certified for PFAS (EPA 533/537.1), lead, and bacteria testing
Water treatment options
Reverse osmosis, activated carbon, and filtration guides with cost ranges
Data sources and methodology
How WaterUtilityReport.com sources and validates official EPA data
Common Questions About Colorado Drinking Water
Does Colorado drinking water have PFAS?
154 Colorado water systems have EPA UCMR 5 PFAS monitoring records (2023–2025)
Which Colorado water utilities have open violations?
Browse Colorado utility compliance records and violation history
How do I test my water in Colorado?
State-certified labs for PFAS (EPA 533/537.1), lead, nitrate, and bacteria testing
What treatment removes PFAS from CO tap water?
Reverse osmosis removes PFAS, lead, arsenic, and nitrates — cost, maintenance, and NSF certification explained
What do Colorado PFAS records tell me about my water?
EPA limits, health context, and what UCMR 5 detection above MRL means for your water
How is Colorado water quality data sourced here?
EPA SDWIS violations, UCMR 5 PFAS records, and CCR data — sources, accuracy notes, and limitations
Colorado Water FAQs
Data sources: Utility compliance and violation data from EPA SDWIS (Safe Drinking Water Information System). PFAS monitoring records from EPA UCMR 5 (Unregulated Contaminant Monitoring Rule 5, 2023–2025). Contaminant data from EPA and ATSDR public references. This page summarizes public records — it is not a compliance determination. Methodology →
Last updated: 2026-04-18