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Community Water System · PWS OK3005717

Grayhorse RWD

Fairfax, Oklahoma 74637 - drinking water served from surface water sources to 100 people, tracked in EPA SDWIS and UCMR5.

100
People served
414
EPA violations
278
Health-based
Untested
UCMR5 result

The verdict

EPA records 414 drinking-water violations at Grayhorse RWD, 67% of them health-based - above the Oklahoma per-system average.

414
Total EPA violations on record
67%
Health-based (MCL / treatment failure)
100
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Grayhorse RWD

Grayhorse RWD is a local-owned community water system that delivers drinking water to 100 residents in Fairfax, Oklahoma (Osage County) through 108 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 414 total violations for this system , of which 278 (67%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 91 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 TTHM, recorded in 159 violations (MCL, health-based). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

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%).

Grayhorse RWD's 414 violations sit above 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
100
Total Violations
414
Health-Based Violations
278
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
108
County
Osage
School/Daycare
No
MCL Violations
278
Monitoring Violations
91
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
TTHM MCL 159 2025
Total Haloacetic Acids (HAA5) MCL 118 2025
TTHM MR 34 2025
Total Haloacetic Acids (HAA5) MR 25 2025
Lead and Copper Rule MR 20 2021
Coliform (TCR) MR 12 2009
Consumer Confidence Rule Other 12 2024
Coliform (TCR) MCL 1 1991

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 Grayhorse RWD.

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 OK3005717 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 TTHM MCL 159 SDWIS / OK3005717 / 2950
2025 Total Haloacetic Acids (HAA5) MCL 118 SDWIS / OK3005717 / 2456
2025 TTHM MR 34 SDWIS / OK3005717 / 2950
2025 Total Haloacetic Acids (HAA5) MR 25 SDWIS / OK3005717 / 2456
2024 Consumer Confidence Rule Other 12 SDWIS / OK3005717 / 7000
2021 Lead and Copper Rule MR 20 SDWIS / OK3005717 / 5000
2009 Coliform (TCR) MR 12 SDWIS / OK3005717 / 3100
1991 Coliform (TCR) MCL 1 SDWIS / OK3005717 / 3100

How Grayhorse RWD Compares

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

Metric Grayhorse RWD Oklahoma avg Federal benchmark
Total violations 414 266.8 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 278 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 100 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 Grayhorse RWD water safe to drink? ▼
Grayhorse RWD (PWS ID: OK3005717) has 414 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 100 people using Surface Water sources.
How many people does Grayhorse RWD serve? ▼
Grayhorse RWD serves 100 people in Fairfax, Oklahoma. It is a Local-owned system using Surface Water water sources with 108 service connections.
What type of violations does Grayhorse RWD have? ▼
Grayhorse RWD has 414 total violations: 278 health-based violations (MCL exceedances or treatment failures), 91 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Grayhorse RWD water? ▼
No PFAS testing data is available for Grayhorse RWD under the EPA's UCMR5 monitoring program.
What water source does Grayhorse RWD use? ▼
Grayhorse RWD 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. 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.