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Community Water System · PWS CO0126325

Gunnison City Of

Gunnison, Colorado 81230 - drinking water served from groundwater sources to 9,610 people, tracked in EPA SDWIS and UCMR5.

9,610
People served
15
EPA violations
2
Health-based
4 PFAS
UCMR5 result

The verdict

EPA records 15 drinking-water violations at Gunnison City Of, 13% of them health-based - below the Colorado per-system average, and UCMR5 testing detected 4 PFAS compounds.

15
Total EPA violations on record
13%
Health-based (MCL / treatment failure)
9,610
People served by this system
4
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Gunnison City Of

Gunnison City Of is a local-owned community water system that delivers drinking water to 9,610 residents in Gunnison, Colorado (Gunnison County) through 2,381 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 15 total violations for this system , of which 2 (13%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 13 monitoring and reporting violations are on file. The most recent violation on record dates to 2021.

The most frequently cited contaminant at this system is Pentachlorophenol, recorded in 3 violations (MR). Under EPA's UCMR5 PFAS monitoring program, 4 PFAS compounds were detected in samples collected from this system, with a maximum reported concentration of 7.2 ppt (parts per trillion). PFAS are persistent synthetic chemicals linked to health effects at very low exposure levels.

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%).

Gunnison City Of's 15 violations sit below 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.

PFAS Detected

4 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.

Population Served
9,610
Total Violations
15
Health-Based Violations
2
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
2,381
County
Gunnison
School/Daycare
No
MCL Violations
2
Monitoring Violations
13
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Pentachlorophenol MR 3 2021
Chlorine MR 3 2018
Coliform (TCR) MCL 2 1992
Benzene MR 1 1989
Carbon tetrachloride MR 1 1989
1,2-Dichloroethane MR 1 1989
1,1-Dichloroethylene MR 1 1989
Trichloroethylene MR 1 1989
1,1,1-Trichloroethane MR 1 1989
p-Dichlorobenzene MR 1 1989

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 6 of 522 samples detected PFAS.

Contaminant Date Result MRL Status
PFTA 9/9/2024 <8.00 ppt 8.00 ppt Not Detected
NEtFOSAA 9/9/2024 <5.00 ppt 5.00 ppt Not Detected
NMeFOSAA 9/9/2024 <6.00 ppt 6.00 ppt Not Detected
PFBS 9/9/2024 3.00 ppt 3.00 ppt Detected
PFMPA 9/9/2024 <4.00 ppt 4.00 ppt Not Detected
PFPeA 9/9/2024 3.00 ppt 3.00 ppt Detected
PFMBA 9/9/2024 <3.00 ppt 3.00 ppt Not Detected
PFEESA 9/9/2024 <3.00 ppt 3.00 ppt Not Detected
NFDHA 9/9/2024 <20.00 ppt 20.00 ppt Not Detected
PFPeS 9/9/2024 <4.00 ppt 4.00 ppt Not Detected
PFHpS 9/9/2024 <3.00 ppt 3.00 ppt Not Detected
PFHpA 9/9/2024 <3.00 ppt 3.00 ppt Not Detected
PFTrDA 9/9/2024 <7.00 ppt 7.00 ppt Not Detected
PFOS 9/9/2024 4.20 ppt 4.00 ppt Detected
PFNA 9/9/2024 <4.00 ppt 4.00 ppt Not Detected
PFDA 9/9/2024 <3.00 ppt 3.00 ppt Not Detected
PFDoA 9/9/2024 <3.00 ppt 3.00 ppt Not Detected
PFHxA 9/9/2024 5.10 ppt 3.00 ppt Detected
PFUnA 9/9/2024 <2.00 ppt 2.00 ppt Not Detected
11Cl-PF3OUdS 9/9/2024 <5.00 ppt 5.00 ppt Not Detected
9Cl-PF3ONS 9/9/2024 <2.00 ppt 2.00 ppt Not Detected
ADONA 9/9/2024 <3.00 ppt 3.00 ppt Not Detected
HFPO-DA 9/9/2024 <5.00 ppt 5.00 ppt Not Detected
PFBA 9/9/2024 <5.00 ppt 5.00 ppt Not Detected
6:2 FTS 9/9/2024 <5.00 ppt 5.00 ppt Not Detected
4:2 FTS 9/9/2024 <3.00 ppt 3.00 ppt Not Detected
8:2 FTS 9/9/2024 <5.00 ppt 5.00 ppt Not Detected
PFHxS 9/9/2024 <3.00 ppt 3.00 ppt Not Detected
PFOA 9/9/2024 <4.00 ppt 4.00 ppt Not Detected
11Cl-PF3OUdS 9/9/2024 <5.00 ppt 5.00 ppt Not Detected
PFMBA 9/9/2024 <3.00 ppt 3.00 ppt Not Detected
PFEESA 9/9/2024 <3.00 ppt 3.00 ppt Not Detected
NFDHA 9/9/2024 <20.00 ppt 20.00 ppt Not Detected
PFPeS 9/9/2024 <4.00 ppt 4.00 ppt Not Detected
PFHpS 9/9/2024 <3.00 ppt 3.00 ppt Not Detected
PFBS 9/9/2024 <3.00 ppt 3.00 ppt Not Detected
PFHpA 9/9/2024 <3.00 ppt 3.00 ppt Not Detected
PFHxS 9/9/2024 <3.00 ppt 3.00 ppt Not Detected
PFNA 9/9/2024 <4.00 ppt 4.00 ppt Not Detected
PFOA 9/9/2024 <4.00 ppt 4.00 ppt Not Detected
PFDoA 9/9/2024 <3.00 ppt 3.00 ppt Not Detected
PFUnA 9/9/2024 <2.00 ppt 2.00 ppt Not Detected
PFOS 9/9/2024 <4.00 ppt 4.00 ppt Not Detected
9Cl-PF3ONS 9/9/2024 <2.00 ppt 2.00 ppt Not Detected
ADONA 9/9/2024 <3.00 ppt 3.00 ppt Not Detected
HFPO-DA 9/9/2024 <5.00 ppt 5.00 ppt Not Detected
PFBA 9/9/2024 <5.00 ppt 5.00 ppt Not Detected
6:2 FTS 9/9/2024 <5.00 ppt 5.00 ppt Not Detected
4:2 FTS 9/9/2024 <3.00 ppt 3.00 ppt Not Detected
8:2 FTS 9/9/2024 <5.00 ppt 5.00 ppt Not Detected

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 Gunnison City Of.

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 CO0126325 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 Gunnison City Of 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
2021 Pentachlorophenol MR 3 SDWIS / CO0126325 / 2326
2018 Chlorine MR 3 SDWIS / CO0126325 / 0999
1992 Coliform (TCR) MCL 2 SDWIS / CO0126325 / 3100
1989 Benzene MR 1 SDWIS / CO0126325 / 2990
1989 Carbon tetrachloride MR 1 SDWIS / CO0126325 / 2982
1989 1,2-Dichloroethane MR 1 SDWIS / CO0126325 / 2980
1989 1,1-Dichloroethylene MR 1 SDWIS / CO0126325 / 2977
1989 Trichloroethylene MR 1 SDWIS / CO0126325 / 2984
1989 1,1,1-Trichloroethane MR 1 SDWIS / CO0126325 / 2981
1989 p-Dichlorobenzene MR 1 SDWIS / CO0126325 / 2969

How Gunnison City Of Compares

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

Metric Gunnison City Of Colorado avg Federal benchmark
Total violations 15 108.9 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 2 13.9 Indicates a contaminant exceeded a federal MCL
PFAS detection 4 compounds 60.1% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 9,610 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 Gunnison City Of water safe to drink?
Gunnison City Of (PWS ID: CO0126325) has 15 recorded violations in the EPA SDWIS database. PFAS contamination has been detected in UCMR5 testing, with 4 PFAS compounds found. This system serves 9,610 people using Groundwater sources.
How many people does Gunnison City Of serve?
Gunnison City Of serves 9,610 people in Gunnison, Colorado. It is a Local-owned system using Groundwater water sources with 2,381 service connections.
What type of violations does Gunnison City Of have?
Gunnison City Of has 15 total violations: 2 health-based violations (MCL exceedances or treatment failures), 13 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Gunnison City Of water?
Yes. UCMR5 testing detected 4 PFAS compounds in Gunnison City Of's water supply: PFBS, PFPeA, PFOS, PFHxA. PFAS are persistent "forever chemicals" that do not break down in the environment.
What water source does Gunnison City Of use?
Gunnison City Of 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. PFAS data from EPA UCMR5 monitoring program (2023-2025). This data is provided for informational purposes only.
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.