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Community Water System · PWS OK1021203

Shidler

Shidler, Oklahoma 74652 - drinking water served from surface water sources to 404 people, tracked in EPA SDWIS and UCMR5.

404
People served
983
EPA violations
770
Health-based
Untested
UCMR5 result

The verdict

EPA records 983 drinking-water violations at Shidler, 78% of them health-based - above the Oklahoma per-system average.

983
Total EPA violations on record
78%
Health-based (MCL / treatment failure)
404
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Shidler

Shidler is a local-owned community water system that delivers drinking water to 404 residents in Shidler, Oklahoma (Osage County) through 198 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 983 total violations for this system , of which 770 (78%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 190 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 306 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%).

Shidler's 983 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
404
Total Violations
983
Health-Based Violations
770
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
198
County
Osage
School/Daycare
No
MCL Violations
449
Monitoring Violations
190
Treatment Tech Violations
321

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
TTHM MCL 306 2022
Interim Enhanced Surface Water Treatment Rule TT 198 2020
Total Haloacetic Acids (HAA5) MCL 127 2025
CARBON, TOTAL TT 114 2021
Interim Enhanced Surface Water Treatment Rule MR 42 2020
Coliform (TCR) MR 36 2009
Total Haloacetic Acids (HAA5) MR 30 2022
TTHM MR 30 2022
CARBON, TOTAL MR 27 2009
Coliform (TCR) MCL 16 2009
Surface Water Treatment Rule TT 9 2001
Lead and Copper Rule MR 8 2010
Nitrate-Nitrite MR 7 2024
Surface Water Treatment Rule MR 4 2002
Chlorine MR 4 2021
Nitrate MR 2 2002
Consumer Confidence Rule Other 1 2013

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 Shidler.

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 OK1021203 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 Total Haloacetic Acids (HAA5) MCL 127 SDWIS / OK1021203 / 2456
2024 Nitrate-Nitrite MR 7 SDWIS / OK1021203 / 1038
2022 TTHM MCL 306 SDWIS / OK1021203 / 2950
2022 Total Haloacetic Acids (HAA5) MR 30 SDWIS / OK1021203 / 2456
2022 TTHM MR 30 SDWIS / OK1021203 / 2950
2021 CARBON, TOTAL TT 114 SDWIS / OK1021203 / 2920
2021 Chlorine MR 4 SDWIS / OK1021203 / 0999
2020 Interim Enhanced Surface Water Treatment Rule TT 198 SDWIS / OK1021203 / 0300
2020 Interim Enhanced Surface Water Treatment Rule MR 42 SDWIS / OK1021203 / 0300
2013 Consumer Confidence Rule Other 1 SDWIS / OK1021203 / 7000
2010 Lead and Copper Rule MR 8 SDWIS / OK1021203 / 5000
2009 Coliform (TCR) MR 36 SDWIS / OK1021203 / 3100
2009 CARBON, TOTAL MR 27 SDWIS / OK1021203 / 2920
2009 Coliform (TCR) MCL 16 SDWIS / OK1021203 / 3100
2002 Surface Water Treatment Rule MR 4 SDWIS / OK1021203 / 0200

How Shidler Compares

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

Metric Shidler Oklahoma avg Federal benchmark
Total violations 983 266.8 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 770 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 404 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 Shidler water safe to drink? ▼
Shidler (PWS ID: OK1021203) has 983 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 404 people using Surface Water sources.
How many people does Shidler serve? ▼
Shidler serves 404 people in Shidler, Oklahoma. It is a Local-owned system using Surface Water water sources with 198 service connections.
What type of violations does Shidler have? ▼
Shidler has 983 total violations: 770 health-based violations (MCL exceedances or treatment failures), 190 monitoring/reporting violations, and 321 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Shidler water? ▼
No PFAS testing data is available for Shidler under the EPA's UCMR5 monitoring program.
What water source does Shidler use? ▼
Shidler 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.