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Washington, OK Tap Water Quality 2026

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

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

Main Utility: Washington PWSID: OK2004703 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead is 4.48 ppb, 30% of the action level and no violations are open. PFAS has never been sampled at this system.

B

Washington earns a B for water quality

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

Lead: 4.48 ppb — 30% of the federal action level
PFAS never sampled at this system
41 violations since 2015, 1 health-based
No violations currently open
Washington's lead level vs. all Oklahoma community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 4.48 ppb — 30% of the federal action level
✓ Lower lead than 18% of Oklahoma utilities
Population Served
619
~330 connections
Water Source
Groundwater
Drawn from wells — SDWIS source code GW
Active Violations
0
41 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
30% of EPA action level
4.48 ppb
Action level: 15 ppb
The 90th-percentile lead result is 4.48 ppb, 30% 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 REVISIONS TREATMENT TECHNIQUE — — 2024 Resolved
LEAD AND COPPER RULE REVISIONS REPORTING FAILURE — — 2024 Resolved
Simazine MONITORING AND REPORTING — 0.004 mg/L 2024 Resolved
Dalapon MONITORING AND REPORTING — 0.2 mg/L 2024 Resolved
Dalapon MONITORING AND REPORTING — 0.2 mg/L 2024 Resolved
Dalapon MONITORING AND REPORTING — 0.2 mg/L 2024 Resolved
Diquat MONITORING AND REPORTING — 0.02 mg/L 2024 Resolved
Diquat MONITORING AND REPORTING — 0.02 mg/L 2024 Resolved
Diquat MONITORING AND REPORTING — 0.02 mg/L 2024 Resolved
Glyphosate MONITORING AND REPORTING — 0.7 mg/L 2024 Resolved
Glyphosate MONITORING AND REPORTING — 0.7 mg/L 2024 Resolved
Glyphosate MONITORING AND REPORTING — 0.7 mg/L 2024 Resolved
Simazine MONITORING AND REPORTING — 0.004 mg/L 2024 Resolved
Simazine MONITORING AND REPORTING — 0.004 mg/L 2024 Resolved
Picloram MONITORING AND REPORTING — 0.5 mg/L 2024 Resolved
Picloram MONITORING AND REPORTING — 0.5 mg/L 2024 Resolved
Picloram MONITORING AND REPORTING — 0.5 mg/L 2024 Resolved
Dinoseb MONITORING AND REPORTING — 0.007 mg/L 2024 Resolved
Dinoseb MONITORING AND REPORTING — 0.007 mg/L 2024 Resolved
Dinoseb MONITORING AND REPORTING — 0.007 mg/L 2024 Resolved
Atrazine MONITORING AND REPORTING — 0.003 mg/L 2024 Resolved
Atrazine MONITORING AND REPORTING — 0.003 mg/L 2024 Resolved
LASSO MONITORING AND REPORTING — — 2024 Resolved
LASSO MONITORING AND REPORTING — — 2024 Resolved
2,4-D MONITORING AND REPORTING — 0.07 mg/L 2024 Resolved
2,4,5-TP MONITORING AND REPORTING — 0.05 mg/L 2024 Resolved
2,4,5-TP MONITORING AND REPORTING — 0.05 mg/L 2024 Resolved
2,4,5-TP MONITORING AND REPORTING — 0.05 mg/L 2024 Resolved
Pentachlorophenol MONITORING AND REPORTING — 0.001 mg/L 2024 Resolved
Pentachlorophenol MONITORING AND REPORTING — 0.001 mg/L 2024 Resolved
Pentachlorophenol MONITORING AND REPORTING — 0.001 mg/L 2024 Resolved
Simazine MONITORING AND REPORTING — 0.004 mg/L 2023 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2021 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2021 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2021 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2020 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2020 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2019 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2019 Resolved
Consumer Confidence Rule OTHER — — 2017 Resolved
Consumer Confidence Rule OTHER — — 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

41 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 Washington
PWSID OK2004703
Water source Groundwater — Drawn from wells — SDWIS source code GW
Population served 619
Service connections 330
Systems serving this area 3
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Washington tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 4.48 ppb, 30% of the action level.
Does Washington 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 Washington? ▼
Washington (PWSID OK2004703), one of 3 systems serving this area. Groundwater. Drawn from wells — SDWIS source code GW
When was this system last inspected? ▼
It was last inspected on 2025-09-18. Inspectors recorded 1 significant deficiency.

What Should Washington 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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