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Community Water System · PWS CO0126189

Crested Butte South

Crested Butte, Colorado 81224 - drinking water served from groundwater sources to 2,000 people, tracked in EPA SDWIS and UCMR5.

2,000
People served
276
EPA violations
0
Health-based
Untested
UCMR5 result

The verdict

EPA records 276 drinking-water violations at Crested Butte South - above the Colorado per-system average.

276
Total EPA violations on record
0%
Health-based (MCL / treatment failure)
2,000
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Crested Butte South

Crested Butte South is a local-owned community water system that delivers drinking water to 2,000 residents in Crested Butte, Colorado (Gunnison County) through 553 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 276 total violations for this system , of which 0 (0%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 268 monitoring and reporting violations are on file. The most recent violation on record dates to 2022.

The most frequently cited contaminant at this system is Consumer Confidence Rule, recorded in 5 violations (Other). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across Colorado, EPA tracks 2,193 public water systems serving 7,473,456 people, with 238,796 cumulative violations and 30,589 health-based violations on record. About 93% of systems in the state carry at least one violation, and state-wide the average per system is 108.9 violations. Statewide, 98 of 163 UCMR5-tested systems have reported PFAS detections (60.1%).

Crested Butte South's 276 violations sit above the Colorado average.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
2,000
Total Violations
276
Health-Based Violations
0
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
553
County
Gunnison
School/Daycare
No
MCL Violations
0
Monitoring Violations
268
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Consumer Confidence Rule Other 5 2018
1,2,4-Trichlorobenzene MR 4 2011
o-Dichlorobenzene MR 4 2011
trans-1,2-Dichloroethylene MR 4 2011
1,1,1-Trichloroethane MR 4 2011
1,2-Dichloropropane MR 4 2011
1,1,2-Trichloroethane MR 4 2011
Tetrachloroethylene MR 4 2011
CHLOROBENZENE MR 4 2011
Benzene MR 4 2011
Ethylbenzene MR 4 2011
Styrene MR 4 2011
Chromium MR 4 2011
Nickel MR 4 2011
Antimony, Total MR 4 2011
Beryllium, Total MR 4 2011
Endrin MR 4 2011
Methoxychlor MR 4 2011
Dalapon MR 4 2011
Diquat MR 4 2011
Endothall MR 4 2011
OXAMYL MR 4 2011
Di(2-ethylhexyl) phthalate MR 4 2011
Hexachlorocyclopentadiene MR 4 2011
Aldicarb sulfone MR 4 2011
Carbofuran MR 4 2011
Aldicarb MR 4 2011
LASSO MR 4 2011
Heptachlor MR 4 2011
Heptachlor epoxide MR 4 2011

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for Crested Butte South.

Federal Source of Truth

EPA SDWIS, Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID CO0126189 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Colorado Drinking Water Authority

Colorado Department of Public Health and Environment, Water Quality Control is the primacy agency that licenses and inspects Crested Butte South under EPA-delegated authority.

Open CO regulator portal

Source: Colorado Department of Public Health and Environment, Water Quality Control

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2022 Revised Total Coliform Rule Other 3 SDWIS / CO0126189 / 8000
2018 Consumer Confidence Rule Other 5 SDWIS / CO0126189 / 7000
2011 1,2,4-Trichlorobenzene MR 4 SDWIS / CO0126189 / 2378
2011 o-Dichlorobenzene MR 4 SDWIS / CO0126189 / 2968
2011 trans-1,2-Dichloroethylene MR 4 SDWIS / CO0126189 / 2979
2011 1,1,1-Trichloroethane MR 4 SDWIS / CO0126189 / 2981
2011 1,2-Dichloropropane MR 4 SDWIS / CO0126189 / 2983
2011 1,1,2-Trichloroethane MR 4 SDWIS / CO0126189 / 2985
2011 Tetrachloroethylene MR 4 SDWIS / CO0126189 / 2987
2011 CHLOROBENZENE MR 4 SDWIS / CO0126189 / 2989
2011 Benzene MR 4 SDWIS / CO0126189 / 2990
2011 Ethylbenzene MR 4 SDWIS / CO0126189 / 2992
2011 Styrene MR 4 SDWIS / CO0126189 / 2996
2011 Chromium MR 4 SDWIS / CO0126189 / 1020
2011 Nickel MR 4 SDWIS / CO0126189 / 1036

How Crested Butte South Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric Crested Butte South Colorado avg Federal benchmark
Total violations 276 108.9 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 0 13.9 Indicates a contaminant exceeded a federal MCL
PFAS detection None 60.1% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 2,000 3,408 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 2,193 regulated public water systems in Colorado.

Federal MCL reference, Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is Crested Butte South water safe to drink? ▼
Crested Butte South (PWS ID: CO0126189) has 276 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 2,000 people using Groundwater sources.
How many people does Crested Butte South serve? ▼
Crested Butte South serves 2,000 people in Crested Butte, Colorado. It is a Local-owned system using Groundwater water sources with 553 service connections.
What type of violations does Crested Butte South have? ▼
Crested Butte South has 276 total violations: 0 health-based violations (MCL exceedances or treatment failures), 268 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Crested Butte South water? ▼
No PFAS testing data is available for Crested Butte South under the EPA's UCMR5 monitoring program.
What water source does Crested Butte South use? ▼
Crested Butte South uses Groundwater as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.