Seattle
Is Seattle tap water safe to drink?
Mostly yes — Seattle scores 82/100. This report aggregates EPA drinking water data across 1 local system in Seattle. We found 0 total violations (0 unresolved).
Real-Time Environment
Live: 02:30 PM☀️ No active precipitation. Rainfall can impact surface water turbidity and pollutant runoff in Seattle.
Water Quality Impact
🛡️ Home Water Treatment Needs
Should you invest in filtration or softening for your home in Seattle?
Expert Advice
Given the safety margin, a Carbon Block or sediment filter is recommended to improve taste and remove trace particulates.
Buying a Filter?
Wondering if Seattle tap water needs filtering? We break it down.
Baby Formula Safety
Mixing baby formula with Seattle tap water? Read this first.
Homebuyer's Perspective
If you're house-hunting in Seattle, water quality belongs on your due-diligence checklist alongside schools and crime data. The high safety score (82/100) suggests lower risk for plumbing corrosion and appliance scaling.
Health & Family Safety
Residents should monitor Copper levels. Pregnant women and families with young children should consult the specific EPA health goals listed below.
View Health Risk Glossary →Compliance Record for Seattle
Based on EPA SDWIS violation records and contaminant test results for all water systems serving Seattle.
Frequently Asked Questions
Is Seattle tap water safe to drink?
Mostly yes — Seattle scores 82/100.
How many water systems serve Seattle?
Seattle is served by 1 public water system in our latest EPA-backed dataset.
How can I check water quality for my exact address in Seattle?
Use the WaterQ search tool to look up your ZIP code and view nearby systems, contaminant levels, and recent violations for Seattle.
What is the water quality score for Seattle?
The water quality score for Seattle is 82 out of 100, based on EPA contaminant data, violation history, and testing results for all serving water systems.
What are the top contaminants in Seattle?
The top contaminants detected in Seattle include Copper, Chromium (Total), Nitrate. View detailed information on our contaminants page.
Seattle Water Quality Summary
Seattle, WA receives a water quality score of 82/100 (Grade B) based on EPA Safe Drinking Water Information System (SDWIS) compliance data for 6 public water systems serving the area.
Seattle's water quality is above the national average, with strong compliance records and low contaminant levels. Residents generally receive clean, safe tap water that meets EPA standards.
Seattle's score of 82 is 13 points below the Washington state average of 95, and above the nationwide average of roughly 78/100 across all U.S. states.
For residents and prospective homebuyers in this large Washington city, the surrounding Pacific Northwest region of forested mountains and the Puget Sound coastline provides generally clean source water. Although Seattle maintains a solid standard of water quality overall, managing distribution across multiple distinct systems within a major urban infrastructure can introduce localized variations. This means households can expect dependable tap water on a daily basis, even if managing such an expansive network keeps the city just short of a perfect score.
Water quality data is sourced from the U.S. EPA SDWIS database and updated quarterly. Learn about our scoring methodology → Read our Washington water quality rankings report →
Key Contaminants
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Water Systems Serving Seattle (1)
Check Your Specific Address
Water quality can vary by neighborhood in Seattle.
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Compare Seattle water quality: View all states · Contaminant library · How we score water quality