States ›Oklahoma ›Washington County ›Copan

Copan, OK Tap Water Quality 2026

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

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

Main Utility: Copan Pwa PWSID: OK1021417 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead is 2.30 ppb, 15% of the action level and no violations are open. PFAS has never been sampled at this system.

B

Copan earns a B for water quality

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

Lead: 2.30 ppb — 15% of the federal action level
PFAS never sampled at this system
122 violations since 2015, 47 health-based
No violations currently open
Copan's lead level vs. all Oklahoma community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 2.30 ppb — 15% of the federal action level
✓ Lower lead than 42% of Oklahoma utilities
Population Served
709
~403 connections
Water Source
Surface water
Drawn from surface water — SDWIS source code SW
Active Violations
0
122 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
15% of EPA action level
2.30 ppb
Action level: 15 ppb
The 90th-percentile lead result is 2.30 ppb, 15% of the 15 ppb federal action level. The action level is a treatment trigger, not a legal maximum, and it is measured across sampled taps rather than at any single home.

Contaminant Violations (2015–Present)

ContaminantTypeMeasuredLimitPeriodStatus
Lead and Copper Rule MONITORING AND REPORTING — TT 2026 Addressed
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2026 Archived
Revised Total Coliform Rule MONITORING FAILURE — — 2026 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.118 MG/L 0.060 mg/L 2025 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.135 MG/L 0.060 mg/L 2025 Archived
TTHM MCL EXCEEDANCE 0.107 MG/L 0.080 mg/L 2025 Archived
TTHM MCL EXCEEDANCE 0.088 MG/L 0.080 mg/L 2025 Archived
Interim Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2025 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.124 MG/L 0.060 mg/L 2025 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.141 MG/L 0.060 mg/L 2025 Archived
TTHM MCL EXCEEDANCE 0.11 MG/L 0.080 mg/L 2025 Archived
TTHM MCL EXCEEDANCE 0.09 MG/L 0.080 mg/L 2025 Archived
Interim Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2025 Archived
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2025 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2025 Resolved
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2025 Archived
Interim Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2025 Archived
Interim Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2025 Archived
TTHM MONITORING AND REPORTING — 0.080 mg/L 2025 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2025 Resolved
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2025 Archived
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2025 Archived
Interim Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2025 Archived
Interim Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2025 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.105 MG/L 0.060 mg/L 2025 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.118 MG/L 0.060 mg/L 2025 Archived
TTHM MCL EXCEEDANCE 0.099 MG/L 0.080 mg/L 2025 Archived
Public Notice OTHER — — 2025 Addressed
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2025 Archived
Interim Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2025 Archived
Interim Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2025 Archived
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2025 Resolved
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2025 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.105 MG/L 0.060 mg/L 2025 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.113 MG/L 0.060 mg/L 2025 Archived
TTHM MCL EXCEEDANCE 0.1 MG/L 0.080 mg/L 2025 Archived
Nitrate-Nitrite MONITORING AND REPORTING — — 2025 Archived
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2024 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2024 Resolved
Public Notice OTHER — — 2024 Addressed
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2024 Resolved
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2024 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2024 Resolved
CARBON, TOTAL MONITORING AND REPORTING — TT 2024 Resolved
CARBON, TOTAL MONITORING AND REPORTING — TT 2024 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2024 Resolved
LEAD AND COPPER RULE REVISIONS TREATMENT TECHNIQUE — — 2024 Addressed
LEAD AND COPPER RULE REVISIONS REPORTING FAILURE — — 2024 Addressed
Lead and Copper Rule MONITORING AND REPORTING — TT 2024 Resolved
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2024 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.078 MG/L 0.060 mg/L 2024 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.075 MG/L 0.060 mg/L 2024 Archived
TTHM MCL EXCEEDANCE 0.084 MG/L 0.080 mg/L 2024 Archived
TTHM MCL EXCEEDANCE 0.098 MG/L 0.080 mg/L 2024 Archived
TTHM MONITORING AND REPORTING — 0.080 mg/L 2024 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2024 Resolved
Public Notice OTHER — — 2024 Addressed
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2024 Resolved
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2024 Resolved
Consumer Confidence Rule OTHER — — 2024 Addressed
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2024 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.061 MG/L 0.060 mg/L 2024 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.061 MG/L 0.060 mg/L 2024 Archived
TTHM MCL EXCEEDANCE 0.1 MG/L 0.080 mg/L 2024 Archived
TTHM MCL EXCEEDANCE 0.086 MG/L 0.080 mg/L 2024 Archived
TTHM MONITORING AND REPORTING — 0.080 mg/L 2024 Resolved
Public Notice OTHER — — 2024 Addressed
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2024 Resolved
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2024 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2024 Resolved
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2024 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2024 Resolved
CARBON, TOTAL MONITORING AND REPORTING — TT 2024 Resolved
CARBON, TOTAL MONITORING AND REPORTING — TT 2024 Resolved
TTHM MCL EXCEEDANCE 0.099 MG/L 0.080 mg/L 2024 Archived
TTHM MCL EXCEEDANCE 0.11 MG/L 0.080 mg/L 2024 Archived
TTHM MONITORING AND REPORTING — 0.080 mg/L 2024 Resolved
Public Notice OTHER — — 2024 Addressed
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2024 Resolved
TTHM MCL EXCEEDANCE 0.099 MG/L 0.080 mg/L 2024 Archived
TTHM MCL EXCEEDANCE 0.107 MG/L 0.080 mg/L 2024 Archived
TTHM MONITORING AND REPORTING — 0.080 mg/L 2023 Resolved
Public Notice OTHER — — 2023 Addressed
TTHM MCL EXCEEDANCE 0.088 MG/L 0.080 mg/L 2023 Archived
TTHM MCL EXCEEDANCE 0.101 MG/L 0.080 mg/L 2023 Archived
TTHM MONITORING AND REPORTING — 0.080 mg/L 2023 Resolved
TTHM MCL EXCEEDANCE 0.094 MG/L 0.080 mg/L 2023 Archived
TTHM MCL EXCEEDANCE 0.081 MG/L 0.080 mg/L 2023 Archived
Interim Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2023 Resolved
Interim Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2023 Resolved
1,2,4-Trichlorobenzene MONITORING AND REPORTING — 0.07 mg/L 2023–2025 Archived
cis-1,2-Dichloroethylene MONITORING AND REPORTING — 0.07 mg/L 2023–2025 Archived
Xylenes, Total MONITORING AND REPORTING — 10 mg/L 2023–2025 Archived
DICHLOROMETHANE MONITORING AND REPORTING — 0.005 mg/L 2023–2025 Archived
o-Dichlorobenzene MONITORING AND REPORTING — 0.6 mg/L 2023–2025 Archived
p-Dichlorobenzene MONITORING AND REPORTING — 0.075 mg/L 2023–2025 Archived
Vinyl chloride MONITORING AND REPORTING — 0.002 mg/L 2023–2025 Archived
1,1-Dichloroethylene MONITORING AND REPORTING — 0.007 mg/L 2023–2025 Archived
trans-1,2-Dichloroethylene MONITORING AND REPORTING — 0.1 mg/L 2023–2025 Archived
1,2-Dichloroethane MONITORING AND REPORTING — 0.005 mg/L 2023–2025 Archived
1,1,1-Trichloroethane MONITORING AND REPORTING — 0.2 mg/L 2023–2025 Archived
Carbon tetrachloride MONITORING AND REPORTING — 0.005 mg/L 2023–2025 Archived
1,2-Dichloropropane MONITORING AND REPORTING — 0.005 mg/L 2023–2025 Archived
Trichloroethylene MONITORING AND REPORTING — 0.005 mg/L 2023–2025 Archived
1,1,2-Trichloroethane MONITORING AND REPORTING — 0.005 mg/L 2023–2025 Archived
Tetrachloroethylene MONITORING AND REPORTING — 0.005 mg/L 2023–2025 Archived
CHLOROBENZENE MONITORING AND REPORTING — 0.1 mg/L 2023–2025 Archived
Benzene MONITORING AND REPORTING — 0.005 mg/L 2023–2025 Archived
Toluene MONITORING AND REPORTING — 1 mg/L 2023–2025 Archived
Ethylbenzene MONITORING AND REPORTING — 0.7 mg/L 2023–2025 Archived
Styrene MONITORING AND REPORTING — 0.1 mg/L 2023–2025 Archived
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2022 Resolved
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2021 Resolved
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2020 Resolved
Gross Alpha, Excl. Radon and U MONITORING AND REPORTING — 15 pCi/L 2020–2025 Archived
Combined Uranium MONITORING AND REPORTING — 30 ug/L 2020–2025 Archived
Combined Radium (-226 and -228) MONITORING AND REPORTING — 5 pCi/L 2020–2025 Archived
Gross Beta Particle Activity MONITORING AND REPORTING — 4 mrem/yr 2020–2025 Archived
Interim Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2019 Resolved
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2018 Resolved
Interim Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2017 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2016 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

122 violations are on record since 2015, of which 47 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Copan Pwa
PWSID OK1021417
Water source Surface water — Drawn from surface water — SDWIS source code SW
Population served 709
Service connections 403
Systems serving this area 2
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Copan tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 2.30 ppb, 15% of the action level.
Does Copan water have PFAS? ▼
This system has never been sampled for PFAS. EPA's national monitoring covered systems serving 3,300 people or more, so no results exist — which is not evidence that none is present.
Who supplies water to Copan? ▼
Copan Pwa (PWSID OK1021417), one of 2 systems serving this area. Surface water. Drawn from surface water — SDWIS source code SW
When was this system last inspected? ▼
It was last inspected on 2025-11-10. No significant deficiencies were recorded.

What Should Copan 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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