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Community Water System · PWS OK2007003

Guymon

Guymon, Oklahoma 73942 - drinking water served from groundwater sources to 11,442 people, tracked in EPA SDWIS and UCMR5.

11,442
People served
71
EPA violations
34
Health-based
No PFAS
UCMR5 result

The verdict

EPA records 71 drinking-water violations at Guymon, 48% of them health-based - below the Oklahoma per-system average.

71
Total EPA violations on record
48%
Health-based (MCL / treatment failure)
11,442
People served by this system
0
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Guymon

Guymon is a local-owned community water system that delivers drinking water to 11,442 residents in Guymon, Oklahoma (Texas County) through 4,800 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 71 total violations for this system , of which 34 (48%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 30 monitoring and reporting violations are on file. The most recent violation on record dates to 2025.

The most frequently cited contaminant at this system is Nitrate-Nitrite, recorded in 20 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 Oklahoma, EPA tracks 1,262 public water systems serving 3,699,452 people, with 336,706 cumulative violations and 113,804 health-based violations on record. About 98% of systems in the state carry at least one violation, and state-wide the average per system is 266.8 violations. Statewide, 101 of 166 UCMR5-tested systems have reported PFAS detections (60.8%).

Guymon's 71 violations sit below the Oklahoma 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
11,442
Total Violations
71
Health-Based Violations
34
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
4,800
County
Texas
School/Daycare
No
MCL Violations
34
Monitoring Violations
30
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Nitrate-Nitrite MR 20 2023
Fluoride MCL 16 1981
Coliform (TCR) MCL 14 2005
Nitrate-Nitrite MCL 4 2025
Chlorine MR 4 2019
Revised Total Coliform Rule MON 4 2019
Coliform (TCR) MR 2 1999

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 348 samples detected PFAS.

Contaminant Date Result MRL Status
PFDA 9/4/2023 <3.00 ppt 3.00 ppt Not Detected
PFDoA 9/4/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxA 9/4/2023 <3.00 ppt 3.00 ppt Not Detected
PFUnA 9/4/2023 <2.00 ppt 2.00 ppt Not Detected
11Cl-PF3OUdS 9/4/2023 <5.00 ppt 5.00 ppt Not Detected
PFEESA 9/4/2023 <3.00 ppt 3.00 ppt Not Detected
PFOA 9/4/2023 <4.00 ppt 4.00 ppt Not Detected
PFMPA 9/4/2023 <4.00 ppt 4.00 ppt Not Detected
PFOS 9/4/2023 <4.00 ppt 4.00 ppt Not Detected
9Cl-PF3ONS 9/4/2023 <2.00 ppt 2.00 ppt Not Detected
ADONA 9/4/2023 <3.00 ppt 3.00 ppt Not Detected
PFBA 9/4/2023 <5.00 ppt 5.00 ppt Not Detected
4:2 FTS 9/4/2023 <3.00 ppt 3.00 ppt Not Detected
8:2 FTS 9/4/2023 <5.00 ppt 5.00 ppt Not Detected
PFPeA 9/4/2023 <3.00 ppt 3.00 ppt Not Detected
PFBS 9/4/2023 <3.00 ppt 3.00 ppt Not Detected
PFMBA 9/4/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpA 9/4/2023 <3.00 ppt 3.00 ppt Not Detected
NFDHA 9/4/2023 <20.00 ppt 20.00 ppt Not Detected
PFPeS 9/4/2023 <4.00 ppt 4.00 ppt Not Detected
PFHpS 9/4/2023 <3.00 ppt 3.00 ppt Not Detected
NMeFOSAA 9/4/2023 <6.00 ppt 6.00 ppt Not Detected
NEtFOSAA 9/4/2023 <5.00 ppt 5.00 ppt Not Detected
PFTrDA 9/4/2023 <7.00 ppt 7.00 ppt Not Detected
PFTA 9/4/2023 <8.00 ppt 8.00 ppt Not Detected
PFNA 9/4/2023 <4.00 ppt 4.00 ppt Not Detected
PFHxS 9/4/2023 <3.00 ppt 3.00 ppt Not Detected
6:2 FTS 9/4/2023 <5.00 ppt 5.00 ppt Not Detected
HFPO-DA 9/4/2023 <5.00 ppt 5.00 ppt Not Detected
ADONA 9/4/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeA 9/4/2023 <3.00 ppt 3.00 ppt Not Detected
11Cl-PF3OUdS 9/4/2023 <5.00 ppt 5.00 ppt Not Detected
PFPeS 9/4/2023 <4.00 ppt 4.00 ppt Not Detected
PFUnA 9/4/2023 <2.00 ppt 2.00 ppt Not Detected
PFOA 9/4/2023 <4.00 ppt 4.00 ppt Not Detected
PFHpS 9/4/2023 <3.00 ppt 3.00 ppt Not Detected
NFDHA 9/4/2023 <20.00 ppt 20.00 ppt Not Detected
PFEESA 9/4/2023 <3.00 ppt 3.00 ppt Not Detected
PFMBA 9/4/2023 <3.00 ppt 3.00 ppt Not Detected
PFMPA 9/4/2023 <4.00 ppt 4.00 ppt Not Detected
8:2 FTS 9/4/2023 <5.00 ppt 5.00 ppt Not Detected
4:2 FTS 9/4/2023 <3.00 ppt 3.00 ppt Not Detected
6:2 FTS 9/4/2023 <5.00 ppt 5.00 ppt Not Detected
PFBA 9/4/2023 <5.00 ppt 5.00 ppt Not Detected
PFBS 9/4/2023 <3.00 ppt 3.00 ppt Not Detected
PFTA 9/4/2023 <8.00 ppt 8.00 ppt Not Detected
PFTrDA 9/4/2023 <7.00 ppt 7.00 ppt Not Detected
HFPO-DA 9/4/2023 <5.00 ppt 5.00 ppt Not Detected
NEtFOSAA 9/4/2023 <5.00 ppt 5.00 ppt Not Detected
PFHpA 9/4/2023 <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 Guymon.

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 OK2007003 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Oklahoma Drinking Water Authority

Oklahoma's primacy agency administers the Safe Drinking Water Act locally. Search EPA SDWIS for the current state contact, or use the state's public health or environment department portal.

Find OK regulator via EPA SDWIS

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
2025 Nitrate-Nitrite MCL 4 SDWIS / OK2007003 / 1038
2023 Nitrate-Nitrite MR 20 SDWIS / OK2007003 / 1038
2019 Chlorine MR 4 SDWIS / OK2007003 / 0999
2019 Revised Total Coliform Rule MON 4 SDWIS / OK2007003 / 8000
2005 Coliform (TCR) MCL 14 SDWIS / OK2007003 / 3100
1999 Coliform (TCR) MR 2 SDWIS / OK2007003 / 3100
1981 Fluoride MCL 16 SDWIS / OK2007003 / 1025

How Guymon Compares

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

Metric Guymon Oklahoma avg Federal benchmark
Total violations 71 266.8 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 34 90.2 Indicates a contaminant exceeded a federal MCL
PFAS detection None 60.8% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 11,442 2,931 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 1,262 regulated public water systems in Oklahoma.

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 Guymon water safe to drink? ▼
Guymon (PWS ID: OK2007003) has 71 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 11,442 people using Groundwater sources.
How many people does Guymon serve? ▼
Guymon serves 11,442 people in Guymon, Oklahoma. It is a Local-owned system using Groundwater water sources with 4,800 service connections.
What type of violations does Guymon have? ▼
Guymon has 71 total violations: 34 health-based violations (MCL exceedances or treatment failures), 30 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Guymon water? ▼
No. Guymon was tested for PFAS under the EPA's UCMR5 monitoring program and no PFAS contamination was detected.
What water source does Guymon use? ▼
Guymon 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.

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.