States ›Oklahoma ›Okmulgee County ›Winchester

Winchester, OK Tap Water Quality 2026

Water quality report for Winchester, OK — PFAS, lead and copper results, violation history and state inspection findings from EPA SDWIS.

A look at Winchester's drinking water using EPA enforcement records: violations, lead and copper results, PFAS sampling and state inspection findings.

Main Utility: Okmulgee Co. Rwd #6 (hectorville) PWSID: OK3005611 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead was not detected and no violations are open. PFAS was sampled but not enough times for a compliance determination.

B

Winchester earns a B for water quality

Graded on violations and lead, with state inspection findings. PFAS not tested.

Lead: not detected
PFAS sampled, too few results to judge
80 violations since 2015, 77 health-based
No violations currently open
Winchester's lead level vs. all Oklahoma community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: Not detected — 0% of the federal action level
✓ Lower lead than % of Oklahoma utilities
Population Served
214
~3669 connections
Water Source
Surface water
Purchased from another system — SDWIS source code SWP
Active Violations
0
80 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
0% of EPA action level
Not detected
Action level: 15 ppb
Lead was not detected at the 90th percentile — the result fell below the laboratory detection limit. That is not the same as an absence of lead in every tap, and older homes with lead service lines can still show higher readings.

Contaminant Violations (2015–Present)

ContaminantTypeMeasuredLimitPeriodStatus
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.062 MG/L 0.060 mg/L 2025 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.061 MG/L 0.060 mg/L 2025 Archived
TTHM MONITORING AND REPORTING — 0.080 mg/L 2024 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2024 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.061 MG/L 0.060 mg/L 2022 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.065 MG/L 0.060 mg/L 2022 Archived
TTHM MCL EXCEEDANCE 0.081 MG/L 0.080 mg/L 2022 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.063 MG/L 0.060 mg/L 2022 Archived
TTHM MCL EXCEEDANCE 0.086 MG/L 0.080 mg/L 2022 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.065 MG/L 0.060 mg/L 2022 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.071 MG/L 0.060 mg/L 2022 Archived
TTHM MCL EXCEEDANCE 0.083 MG/L 0.080 mg/L 2022 Archived
TTHM MCL EXCEEDANCE 0.108 MG/L 0.080 mg/L 2022 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.072 MG/L 0.060 mg/L 2021 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.072 MG/L 0.060 mg/L 2021 Archived
TTHM MCL EXCEEDANCE 0.112 MG/L 0.080 mg/L 2021 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.069 MG/L 0.060 mg/L 2021 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.064 MG/L 0.060 mg/L 2021 Archived
TTHM MCL EXCEEDANCE 0.083 MG/L 0.080 mg/L 2021 Archived
TTHM MCL EXCEEDANCE 0.113 MG/L 0.080 mg/L 2021 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.078 MG/L 0.060 mg/L 2021 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.073 MG/L 0.060 mg/L 2021 Archived
TTHM MCL EXCEEDANCE 0.097 MG/L 0.080 mg/L 2021 Archived
TTHM MCL EXCEEDANCE 0.118 MG/L 0.080 mg/L 2021 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.072 MG/L 0.060 mg/L 2021 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.07 MG/L 0.060 mg/L 2021 Archived
TTHM MCL EXCEEDANCE 0.126 MG/L 0.080 mg/L 2021 Archived
TTHM MCL EXCEEDANCE 0.128 MG/L 0.080 mg/L 2021 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.069 MG/L 0.060 mg/L 2020 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.073 MG/L 0.060 mg/L 2020 Resolved
TTHM MCL EXCEEDANCE 0.129 MG/L 0.080 mg/L 2020 Resolved
TTHM MCL EXCEEDANCE 0.137 MG/L 0.080 mg/L 2020 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.076 MG/L 0.060 mg/L 2020 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.074 MG/L 0.060 mg/L 2020 Resolved
TTHM MCL EXCEEDANCE 0.14 MG/L 0.080 mg/L 2020 Resolved
TTHM MCL EXCEEDANCE 0.139 MG/L 0.080 mg/L 2020 Resolved
TTHM MCL EXCEEDANCE 0.177 MG/L 0.080 mg/L 2020 Resolved
TTHM MCL EXCEEDANCE 0.158 MG/L 0.080 mg/L 2020 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.088 MG/L 0.060 mg/L 2020 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.084 MG/L 0.060 mg/L 2020 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.097 MG/L 0.060 mg/L 2020 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.096 MG/L 0.060 mg/L 2020 Resolved
TTHM MCL EXCEEDANCE 0.185 MG/L 0.080 mg/L 2020 Archived
TTHM MCL EXCEEDANCE 0.154 MG/L 0.080 mg/L 2020 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.102 MG/L 0.060 mg/L 2019 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.097 MG/L 0.060 mg/L 2019 Archived
TTHM MCL EXCEEDANCE 0.161 MG/L 0.080 mg/L 2019 Archived
TTHM MCL EXCEEDANCE 0.186 MG/L 0.080 mg/L 2019 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.099 MG/L 0.060 mg/L 2019 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.092 MG/L 0.060 mg/L 2019 Resolved
TTHM MCL EXCEEDANCE 0.174 MG/L 0.080 mg/L 2019 Archived
TTHM MCL EXCEEDANCE 0.157 MG/L 0.080 mg/L 2019 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.089 MG/L 0.060 mg/L 2019 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.094 MG/L 0.060 mg/L 2019 Archived
TTHM MCL EXCEEDANCE 0.123 MG/L 0.080 mg/L 2019 Archived
TTHM MCL EXCEEDANCE 0.127 MG/L 0.080 mg/L 2019 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.087 MG/L 0.060 mg/L 2019 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.09 MG/L 0.060 mg/L 2019 Archived
TTHM MCL EXCEEDANCE 0.134 MG/L 0.080 mg/L 2019 Archived
TTHM MCL EXCEEDANCE 0.13 MG/L 0.080 mg/L 2019 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.085 MG/L 0.060 mg/L 2018 Archived
TTHM MCL EXCEEDANCE 0.126 MG/L 0.080 mg/L 2018 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.077 MG/L 0.060 mg/L 2018 Resolved
TTHM MCL EXCEEDANCE 0.144 MG/L 0.080 mg/L 2018 Resolved
TTHM MCL EXCEEDANCE 0.167 MG/L 0.080 mg/L 2018 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.069 MG/L 0.060 mg/L 2018 Resolved
TTHM MCL EXCEEDANCE 0.137 MG/L 0.080 mg/L 2018 Archived
TTHM MCL EXCEEDANCE 0.159 MG/L 0.080 mg/L 2017 Archived
TTHM MCL EXCEEDANCE 0.143 MG/L 0.080 mg/L 2017 Resolved
TTHM MCL EXCEEDANCE 0.128 MG/L 0.080 mg/L 2017 Archived
TTHM MCL EXCEEDANCE 0.142 MG/L 0.080 mg/L 2017 Resolved
TTHM MCL EXCEEDANCE 0.161 MG/L 0.080 mg/L 2016 Archived
TTHM MCL EXCEEDANCE 0.157 MG/L 0.080 mg/L 2016 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2016 Resolved
TTHM MCL EXCEEDANCE 0.177 MG/L 0.080 mg/L 2016 Archived
TTHM MCL EXCEEDANCE 0.184 MG/L 0.080 mg/L 2016 Resolved
TTHM MCL EXCEEDANCE 0.16 MG/L 0.080 mg/L 2015 Archived
TTHM MCL EXCEEDANCE 0.142 MG/L 0.080 mg/L 2015 Resolved
TTHM MCL EXCEEDANCE 0.111 MG/L 0.080 mg/L 2015 Archived
TTHM MCL EXCEEDANCE 0.098 MG/L 0.080 mg/L 2015 Resolved
Understanding violation types MCL violations mean a contaminant exceeded the federal maximum limit — the most serious type.
TT (Treatment Technique) violations mean required treatment procedures weren't followed, but don't necessarily mean contamination occurred.

Violation History

80 violations are on record since 2015, of which 77 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Okmulgee Co. Rwd #6 (Hectorville)
PWSID OK3005611
Water source Surface water — Purchased from another system — SDWIS source code SWP
Population served 214
Service connections 3,669
Systems serving this area 1
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Winchester tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open.
Does Winchester water have PFAS? ▼
It was sampled, but no sampling point had enough results for a compliance determination.
Who supplies water to Winchester? ▼
Okmulgee Co. Rwd #6 (Hectorville) (PWSID OK3005611). Surface water. Purchased from another system — SDWIS source code SWP
When was this system last inspected? ▼
It was last inspected on 2025-01-08. No significant deficiencies were recorded.

What Should Winchester Residents Do?

1
Read your annual water report
Your supplier publishes a Consumer Confidence Report each July covering the prior year.
2
Check for a lead service line
Lead reaches tap water mainly through service lines and household plumbing. Suppliers now publish an inventory identifying lead lines.
3
Flush before drinking
If water has sat in pipes more than six hours, run the cold tap for two minutes before drinking or cooking.

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