Seattle, Washington Water Quality Report
Comprehensive analysis of tap water safety based on EPA data
Last updated: January 2026
Is Seattle's Water Safe to Drink?
Generally Safe. Seattle's tap water meets EPA standards for drinking water quality. The water scored 94/100 in our analysis.
Contaminants Found in Seattle's Water
1 contaminants tested • Data from EPA SDWIS database
| Contaminant | Level Detected | EPA Limit | % of Limit | Status |
|---|---|---|---|---|
Lead | 0.0035 mg/L | 0.015 mg/L | 23.3% | Safe |
Compliance Violations
Past EPA violations recorded for Seattle's water system
other
Contaminant 0200 - 12/1/2015
ResolvedAbout Seattle's Water System
SEATTLE PUBLIC UTILITIES
- PWS ID:
- WA5377050
- Population Served:
- 1,091,904
- Water Source:
- surface
A94/100
Seattle Water Quality Score
Based on EPA contaminant data and compliance records
100
Contaminants
90
Compliance
85
Infrastructure
Positive Findings
- Excellent overall water quality
- No violations in the past 3 years
- No health-based (MCL) violations
- All tested contaminants well below EPA limits
Protect Your Family's Water
Even with good water quality, many families choose to filter their water for extra peace of mind.
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Other Cities in Washington
Compare water quality with nearby cities.
View all Washington cities →Frequently Asked Questions
- Where does Seattle's water come from?
- Seattle primarily uses surface water sources.
- How often is Seattle's water tested?
- Water utilities are required to test for contaminants regularly and report results to the EPA.
- Should I use a water filter in Seattle?
- While the water meets EPA standards, many families choose filters for extra peace of mind.