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Community Water System · PWS CO0135291

Ft Collins City Of

Fort Collins, Colorado 80521 - drinking water served from surface water sources to 179,901 people, tracked in EPA SDWIS and UCMR5.

179,901
People served
49
EPA violations
4
Health-based
No PFAS
UCMR5 result

The verdict

EPA records 49 drinking-water violations at Ft Collins City Of, 8% of them health-based - below the Colorado per-system average.

49
Total EPA violations on record
8%
Health-based (MCL / treatment failure)
179,901
People served by this system
0
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Ft Collins City Of

Ft Collins City Of is a local-owned community water system that delivers drinking water to 179,901 residents in Fort Collins, Colorado (Larimer County) through 35,866 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 49 total violations for this system , of which 4 (8%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 45 monitoring and reporting violations are on file. The most recent violation on record dates to 2024.

The most frequently cited contaminant at this system is Surface Water Treatment Rule, recorded in 12 violations (MR). This system was sampled under EPA's UCMR5 PFAS monitoring program and no PFAS compounds were detected above the minimum reporting level.

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%).

Ft Collins City Of's 49 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.

Population Served
179,901
Total Violations
49
Health-Based Violations
4
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
35,866
County
Larimer
School/Daycare
No
MCL Violations
0
Monitoring Violations
45
Treatment Tech Violations
4

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Surface Water Treatment Rule MR 12 2024
Lead and Copper Rule MR 6 2010
Interim Enhanced Surface Water Treatment Rule MR 6 2024
Chlorine MR 6 2017
Chlorite MR 5 2006
Chlorine dioxide MR 4 2006
Interim Enhanced Surface Water Treatment Rule TT 4 2017
TTHM MR 3 2021
Total Haloacetic Acids (HAA5) MR 3 2021

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 116 samples detected PFAS.

Contaminant Date Result MRL Status
PFMBA 7/9/2025 <3.00 ppt 3.00 ppt Not Detected
PFEESA 7/9/2025 <3.00 ppt 3.00 ppt Not Detected
NFDHA 7/9/2025 <20.00 ppt 20.00 ppt Not Detected
PFPeS 7/9/2025 <4.00 ppt 4.00 ppt Not Detected
PFHpS 7/9/2025 <3.00 ppt 3.00 ppt Not Detected
PFTA 7/9/2025 <8.00 ppt 8.00 ppt Not Detected
PFTrDA 7/9/2025 <7.00 ppt 7.00 ppt Not Detected
PFHxA 7/9/2025 <3.00 ppt 3.00 ppt Not Detected
NMeFOSAA 7/9/2025 <6.00 ppt 6.00 ppt Not Detected
PFPeA 7/9/2025 <3.00 ppt 3.00 ppt Not Detected
NEtFOSAA 7/9/2025 <5.00 ppt 5.00 ppt Not Detected
PFHpA 7/9/2025 <3.00 ppt 3.00 ppt Not Detected
PFMPA 7/9/2025 <4.00 ppt 4.00 ppt Not Detected
11Cl-PF3OUdS 7/9/2025 <5.00 ppt 5.00 ppt Not Detected
PFBS 7/9/2025 <3.00 ppt 3.00 ppt Not Detected
PFHxS 7/9/2025 <3.00 ppt 3.00 ppt Not Detected
PFNA 7/9/2025 <4.00 ppt 4.00 ppt Not Detected
PFOS 7/9/2025 <4.00 ppt 4.00 ppt Not Detected
PFOA 7/9/2025 <4.00 ppt 4.00 ppt Not Detected
PFDA 7/9/2025 <3.00 ppt 3.00 ppt Not Detected
6:2 FTS 7/9/2025 <5.00 ppt 5.00 ppt Not Detected
PFDoA 7/9/2025 <3.00 ppt 3.00 ppt Not Detected
8:2 FTS 7/9/2025 <5.00 ppt 5.00 ppt Not Detected
4:2 FTS 7/9/2025 <3.00 ppt 3.00 ppt Not Detected
PFBA 7/9/2025 <5.00 ppt 5.00 ppt Not Detected
HFPO-DA 7/9/2025 <5.00 ppt 5.00 ppt Not Detected
ADONA 7/9/2025 <3.00 ppt 3.00 ppt Not Detected
9Cl-PF3ONS 7/9/2025 <2.00 ppt 2.00 ppt Not Detected
PFUnA 7/9/2025 <2.00 ppt 2.00 ppt Not Detected
PFBA 4/2/2025 <5.00 ppt 5.00 ppt Not Detected
ADONA 4/2/2025 <3.00 ppt 3.00 ppt Not Detected
NMeFOSAA 4/2/2025 <6.00 ppt 6.00 ppt Not Detected
NEtFOSAA 4/2/2025 <5.00 ppt 5.00 ppt Not Detected
11Cl-PF3OUdS 4/2/2025 <5.00 ppt 5.00 ppt Not Detected
PFTA 4/2/2025 <8.00 ppt 8.00 ppt Not Detected
9Cl-PF3ONS 4/2/2025 <2.00 ppt 2.00 ppt Not Detected
6:2 FTS 4/2/2025 <5.00 ppt 5.00 ppt Not Detected
4:2 FTS 4/2/2025 <3.00 ppt 3.00 ppt Not Detected
8:2 FTS 4/2/2025 <5.00 ppt 5.00 ppt Not Detected
PFUnA 4/2/2025 <2.00 ppt 2.00 ppt Not Detected
PFMPA 4/2/2025 <4.00 ppt 4.00 ppt Not Detected
PFTrDA 4/2/2025 <7.00 ppt 7.00 ppt Not Detected
PFOS 4/2/2025 <4.00 ppt 4.00 ppt Not Detected
PFHxA 4/2/2025 <3.00 ppt 3.00 ppt Not Detected
PFDoA 4/2/2025 <3.00 ppt 3.00 ppt Not Detected
HFPO-DA 4/2/2025 <5.00 ppt 5.00 ppt Not Detected
PFOA 4/2/2025 <4.00 ppt 4.00 ppt Not Detected
PFNA 4/2/2025 <4.00 ppt 4.00 ppt Not Detected
PFHxS 4/2/2025 <3.00 ppt 3.00 ppt Not Detected
PFHpA 4/2/2025 <3.00 ppt 3.00 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 Ft Collins 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 CO0135291 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 Ft Collins 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
2024 Surface Water Treatment Rule MR 12 SDWIS / CO0135291 / 0200
2024 Interim Enhanced Surface Water Treatment Rule MR 6 SDWIS / CO0135291 / 0300
2021 TTHM MR 3 SDWIS / CO0135291 / 2950
2021 Total Haloacetic Acids (HAA5) MR 3 SDWIS / CO0135291 / 2456
2017 Chlorine MR 6 SDWIS / CO0135291 / 0999
2017 Interim Enhanced Surface Water Treatment Rule TT 4 SDWIS / CO0135291 / 0300
2010 Lead and Copper Rule MR 6 SDWIS / CO0135291 / 5000
2006 Chlorite MR 5 SDWIS / CO0135291 / 1009
2006 Chlorine dioxide MR 4 SDWIS / CO0135291 / 1008

How Ft Collins City Of Compares

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

Metric Ft Collins City Of Colorado avg Federal benchmark
Total violations 49 108.9 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 4 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 179,901 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 Ft Collins City Of water safe to drink?
Ft Collins City Of (PWS ID: CO0135291) has 49 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 179,901 people using Surface Water sources.
How many people does Ft Collins City Of serve?
Ft Collins City Of serves 179,901 people in Fort Collins, Colorado. It is a Local-owned system using Surface Water water sources with 35,866 service connections.
What type of violations does Ft Collins City Of have?
Ft Collins City Of has 49 total violations: 4 health-based violations (MCL exceedances or treatment failures), 45 monitoring/reporting violations, and 4 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Ft Collins City Of water?
No. Ft Collins City Of was tested for PFAS under the EPA's UCMR5 monitoring program and no PFAS contamination was detected.
What water source does Ft Collins City Of use?
Ft Collins City Of uses Surface Water 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.