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Seminole, OK Tap Water Quality 2026

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

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

Main Utility: Seminole PWSID: OK2006720 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead is 1.72 ppb, 11% of the action level and no violations are open. No PFAS was detected.

A

Seminole earns an A for water quality

Graded on violations, lead, and PFAS, with state inspection findings.

Lead: 1.72 ppb — 11% of the federal action level
PFAS tested, none detected
13 violations since 2015, 1 health-based
No violations currently open
Seminole's lead level vs. all Oklahoma community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 1.72 ppb — 11% of the federal action level
✓ Lower lead than 58% of Oklahoma utilities
Population Served
5769
~1067 connections
Water Source
Groundwater
Drawn from wells — SDWIS source code GW
Active Violations
0
13 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
11% of EPA action level
1.72 ppb
Action level: 15 ppb
The 90th-percentile lead result is 1.72 ppb, 11% 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
Gross Alpha, Excl. Radon and U MONITORING AND REPORTING — 15 pCi/L 2023–2025 Archived
Combined Uranium MONITORING AND REPORTING — 30 ug/L 2023–2025 Archived
Combined Radium (-226 and -228) MONITORING AND REPORTING — 5 pCi/L 2023–2025 Archived
Gross Beta Particle Activity MONITORING AND REPORTING — 4 mrem/yr 2023–2025 Archived
Gross Alpha, Excl. Radon and U MONITORING AND REPORTING — 15 pCi/L 2023–2025 Archived
Combined Uranium MONITORING AND REPORTING — 30 ug/L 2023–2025 Archived
Combined Radium (-226 and -228) MONITORING AND REPORTING — 5 pCi/L 2023–2025 Archived
Gross Beta Particle Activity MONITORING AND REPORTING — 4 mrem/yr 2023–2025 Archived
Diquat MONITORING AND REPORTING — 0.02 mg/L 2020 Resolved
Diquat MONITORING AND REPORTING — 0.02 mg/L 2019 Resolved
Glyphosate MONITORING AND REPORTING — 0.7 mg/L 2019 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2017 Resolved
Coliform (TCR) MCL EXCEEDANCE — 5% of samples 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

13 violations are on record since 2015, of which 1 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Seminole
PWSID OK2006720
Water source Groundwater — Drawn from wells — SDWIS source code GW
Population served 5,769
Service connections 1,067
Systems serving this area 4
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Seminole tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 1.72 ppb, 11% of the action level.
Does Seminole water have PFAS? ▼
It was tested for the six regulated PFAS compounds and none were detected.
Who supplies water to Seminole? ▼
Seminole (PWSID OK2006720), one of 4 systems serving this area. Groundwater. Drawn from wells — SDWIS source code GW
When was this system last inspected? ▼
It was last inspected on 2025-11-20. No significant deficiencies were recorded.

What Should Seminole 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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