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Walla Walla, WA Tap Water Quality 2026

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

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

Main Utility: Walla Walla Water Division PWSID: WA5392500 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead is 4.40 ppb, 29% of the action level and no violations are open. No PFAS was detected.

B

Walla Walla earns a B for water quality

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

Lead: 4.40 ppb — 29% of the federal action level
PFAS tested, none detected
57 violations since 2015, 39 health-based
No violations currently open
Walla Walla's lead level vs. all Washington community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 4.40 ppb — 29% of the federal action level
✓ Lower lead than 15% of Washington utilities
Population Served
32682
~15281 connections
Water Source
Surface water
Drawn from surface water — SDWIS source code SW
Active Violations
0
57 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
29% of EPA action level
4.40 ppb
Action level: 15 ppb
The 90th-percentile lead result is 4.40 ppb, 29% 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
Nitrate MONITORING AND REPORTING — 10 mg/L 2023 Resolved
Dalapon MONITORING AND REPORTING — 0.2 mg/L 2022 Resolved
Picloram MONITORING AND REPORTING — 0.5 mg/L 2022 Resolved
Dinoseb MONITORING AND REPORTING — 0.007 mg/L 2022 Resolved
2,4,5-TP MONITORING AND REPORTING — 0.05 mg/L 2022 Resolved
Pentachlorophenol MONITORING AND REPORTING — 0.001 mg/L 2022 Resolved
Dalapon MONITORING AND REPORTING — 0.2 mg/L 2022 Resolved
Picloram MONITORING AND REPORTING — 0.5 mg/L 2022 Resolved
Dinoseb MONITORING AND REPORTING — 0.007 mg/L 2022 Resolved
2,4,5-TP MONITORING AND REPORTING — 0.05 mg/L 2022 Resolved
Pentachlorophenol MONITORING AND REPORTING — 0.001 mg/L 2022 Resolved
Dalapon MONITORING AND REPORTING — 0.2 mg/L 2021 Resolved
Picloram MONITORING AND REPORTING — 0.5 mg/L 2021 Resolved
Dinoseb MONITORING AND REPORTING — 0.007 mg/L 2021 Resolved
2,4,5-TP MONITORING AND REPORTING — 0.05 mg/L 2021 Resolved
Pentachlorophenol MONITORING AND REPORTING — 0.001 mg/L 2021 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2021 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2021 Resolved
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2018 Resolved
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2018 Resolved
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2018 Resolved
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2018 Resolved
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2018 Resolved
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2018 Resolved
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2018 Resolved
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2018 Resolved
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2018 Resolved
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2018 Resolved
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2018 Resolved
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2018 Resolved
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2017 Resolved
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2017 Resolved
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2017 Resolved
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2017 Resolved
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2017 Resolved
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2017 Resolved
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2017 Resolved
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2017 Resolved
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2017 Resolved
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2017 Resolved
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2017 Resolved
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2017 Resolved
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2016 Resolved
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2016 Resolved
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2016 Resolved
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2016 Resolved
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2016 Resolved
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2016 Resolved
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2016 Resolved
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2016 Resolved
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2016 Resolved
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2016 Resolved
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2016 Resolved
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2016 Resolved
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2015 Resolved
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2015 Resolved
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 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

57 violations are on record since 2015, of which 39 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Walla Walla Water Division
PWSID WA5392500
Water source Surface water — Drawn from surface water — SDWIS source code SW
Population served 32,682
Service connections 15,281
Systems serving this area 3
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Walla Walla tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 4.40 ppb, 29% of the action level.
Does Walla Walla water have PFAS? ▼
It was tested for the six regulated PFAS compounds and none were detected.
Who supplies water to Walla Walla? ▼
Walla Walla Water Division (PWSID WA5392500), one of 3 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 2023-10-05. No significant deficiencies were recorded.

What Should Walla Walla 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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