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Community Water System · PWS OK1021304

Barnsdall

Barnsdall, Oklahoma 74002-0879 - drinking water served from surface water sources to 1,243 people, tracked in EPA SDWIS and UCMR5.

1,243
People served
2,431
EPA violations
1,929
Health-based
Untested
UCMR5 result

The verdict

EPA records 2,431 drinking-water violations at Barnsdall, 79% of them health-based - above the Oklahoma per-system average.

2,431
Total EPA violations on record
79%
Health-based (MCL / treatment failure)
1,243
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Barnsdall

Barnsdall is a local-owned community water system that delivers drinking water to 1,243 residents in Barnsdall, Oklahoma (Osage County) through 502 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 2,431 total violations for this system , of which 1,929 (79%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 449 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 628 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%).

Barnsdall's 2,431 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
1,243
Total Violations
2,431
Health-Based Violations
1,929
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
502
County
Osage
School/Daycare
No
MCL Violations
1,055
Monitoring Violations
449
Treatment Tech Violations
874

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
TTHM MCL 628 2025
CARBON, TOTAL TT 555 2025
Total Haloacetic Acids (HAA5) MCL 422 2023
Interim Enhanced Surface Water Treatment Rule MR 171 2024
Interim Enhanced Surface Water Treatment Rule TT 168 2025
Surface Water Treatment Rule TT 149 2025
Total Haloacetic Acids (HAA5) MR 65 2025
TTHM MR 63 2025
Chlorine MR 33 2024
Coliform (TCR) MR 28 2015
CARBON, TOTAL MR 28 2023
Lead and Copper Rule MR 20 2024
Nitrate-Nitrite MR 20 2018
Revised Total Coliform Rule MON 18 2024
Coliform (TCR) MCL 5 2005
Consumer Confidence Rule Other 4 2017
Surface Water Treatment Rule MR 3 2002
LEAD AND COPPER RULE REVISIONS RPT 2 2024
LEAD AND COPPER RULE REVISIONS TT 2 2024

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 Barnsdall.

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 OK1021304 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 628 SDWIS / OK1021304 / 2950
2025 CARBON, TOTAL TT 555 SDWIS / OK1021304 / 2920
2025 Interim Enhanced Surface Water Treatment Rule TT 168 SDWIS / OK1021304 / 0300
2025 Surface Water Treatment Rule TT 149 SDWIS / OK1021304 / 0200
2025 Total Haloacetic Acids (HAA5) MR 65 SDWIS / OK1021304 / 2456
2025 TTHM MR 63 SDWIS / OK1021304 / 2950
2024 Interim Enhanced Surface Water Treatment Rule MR 171 SDWIS / OK1021304 / 0300
2024 Chlorine MR 33 SDWIS / OK1021304 / 0999
2024 Lead and Copper Rule MR 20 SDWIS / OK1021304 / 5000
2024 Revised Total Coliform Rule MON 18 SDWIS / OK1021304 / 8000
2024 LEAD AND COPPER RULE REVISIONS RPT 2 SDWIS / OK1021304 / 5200
2024 LEAD AND COPPER RULE REVISIONS TT 2 SDWIS / OK1021304 / 5200
2023 Total Haloacetic Acids (HAA5) MCL 422 SDWIS / OK1021304 / 2456
2023 CARBON, TOTAL MR 28 SDWIS / OK1021304 / 2920
2018 Nitrate-Nitrite MR 20 SDWIS / OK1021304 / 1038

How Barnsdall Compares

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

Metric Barnsdall Oklahoma avg Federal benchmark
Total violations 2,431 266.8 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 1,929 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 1,243 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 Barnsdall water safe to drink? ▼
Barnsdall (PWS ID: OK1021304) has 2431 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 1,243 people using Surface Water sources.
How many people does Barnsdall serve? ▼
Barnsdall serves 1,243 people in Barnsdall, Oklahoma. It is a Local-owned system using Surface Water water sources with 502 service connections.
What type of violations does Barnsdall have? ▼
Barnsdall has 2,431 total violations: 1,929 health-based violations (MCL exceedances or treatment failures), 449 monitoring/reporting violations, and 874 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Barnsdall water? ▼
No PFAS testing data is available for Barnsdall under the EPA's UCMR5 monitoring program.
What water source does Barnsdall use? ▼
Barnsdall 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.