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Vashon, WA Tap Water Quality 2026

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

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

Main Utility: Water District 19 PWSID: WA5338900 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead is 3.00 ppb, 20% of the action level and no violations are open. No PFAS was detected.

A

Vashon earns an A for water quality

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

Lead: 3.00 ppb — 20% of the federal action level
PFAS tested, none detected
23 violations since 2015, 2 health-based
No violations currently open
Vashon's lead level vs. all Washington community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 3.00 ppb — 20% of the federal action level
✓ Lower lead than 34% of Washington utilities
Population Served
3479
~1704 connections
Water Source
Surface water
Drawn from surface water — SDWIS source code SW
Active Violations
0
23 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
20% of EPA action level
3.00 ppb
Action level: 15 ppb
The 90th-percentile lead result is 3.00 ppb, 20% 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
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2025 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 61.4 UG/L 0.060 mg/L 2020 Resolved
1,2,4-Trichlorobenzene MONITORING AND REPORTING — 0.07 mg/L 2020–2025 Resolved
cis-1,2-Dichloroethylene MONITORING AND REPORTING — 0.07 mg/L 2020–2025 Resolved
DICHLOROMETHANE MONITORING AND REPORTING — 0.005 mg/L 2020–2025 Resolved
o-Dichlorobenzene MONITORING AND REPORTING — 0.6 mg/L 2020–2025 Resolved
p-Dichlorobenzene MONITORING AND REPORTING — 0.075 mg/L 2020–2025 Resolved
Vinyl chloride MONITORING AND REPORTING — 0.002 mg/L 2020–2025 Resolved
1,1-Dichloroethylene MONITORING AND REPORTING — 0.007 mg/L 2020–2025 Resolved
trans-1,2-Dichloroethylene MONITORING AND REPORTING — 0.1 mg/L 2020–2025 Resolved
1,2-Dichloroethane MONITORING AND REPORTING — 0.005 mg/L 2020–2025 Resolved
1,1,1-Trichloroethane MONITORING AND REPORTING — 0.2 mg/L 2020–2025 Resolved
Carbon tetrachloride MONITORING AND REPORTING — 0.005 mg/L 2020–2025 Resolved
1,2-Dichloropropane MONITORING AND REPORTING — 0.005 mg/L 2020–2025 Resolved
Trichloroethylene MONITORING AND REPORTING — 0.005 mg/L 2020–2025 Resolved
1,1,2-Trichloroethane MONITORING AND REPORTING — 0.005 mg/L 2020–2025 Resolved
Tetrachloroethylene MONITORING AND REPORTING — 0.005 mg/L 2020–2025 Resolved
CHLOROBENZENE MONITORING AND REPORTING — 0.1 mg/L 2020–2025 Resolved
Benzene MONITORING AND REPORTING — 0.005 mg/L 2020–2025 Resolved
Toluene MONITORING AND REPORTING — 1 mg/L 2020–2025 Resolved
Ethylbenzene MONITORING AND REPORTING — 0.7 mg/L 2020–2025 Resolved
Styrene MONITORING AND REPORTING — 0.1 mg/L 2020–2025 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 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

23 violations are on record since 2015, of which 2 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Water District 19
PWSID WA5338900
Water source Surface water — Drawn from surface water — SDWIS source code SW
Population served 3,479
Service connections 1,704
Systems serving this area 13
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Vashon tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 3.00 ppb, 20% of the action level.
Does Vashon water have PFAS? ▼
It was tested for the six regulated PFAS compounds and none were detected.
Who supplies water to Vashon? ▼
Water District 19 (PWSID WA5338900), one of 13 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 2023-05-16. No significant deficiencies were recorded.

What Should Vashon 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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