Seattle, WA water quality
Seattle, WA is served by 15 public water systems, serving 1,390,413 people combined. Across those systems, we count 19 health-based violations in the last 5 years. The worst Tap Grade among them is F.
Water systems serving Seattle
SEATTLE PUBLIC UTILITIES
Seattle, WA · 1,161,961 served
PORT OF SEATTLE/SEATAC AIRPORT
Seattle, WA · 49,483 served
KING COUNTY WATER DISTRICT #20
Seattle, WA · 48,469 served
TUKWILA WATER DEPARTMENT
Tukwila, WA · 36,298 served
North City Water District
Shoreline, WA · 32,847 served
KING COUNTY WATER DISTRICT #49
Burien, WA · 23,492 served
KING COUNTY WATER DISTRICT #125
SEATTLE, WA · 21,904 served
SKYWAY WATER & SEWER
Seattle, WA · 12,036 served
LAKE FOREST PARK WATER DISTRICT
Lake Forest Park, WA · 3,171 served
Highlands Utility District
Shoreline, WA · 275 served
CEDAR FALLS SUPPLY
Seattle, WA · 184 served
Bullitt Center
Seattle, WA · 175 served
HOT SPRINGS COURT
SEATTLE, WA · 55 served
RIO VISTA
Seattle, WA · 36 served
KING COUNTY SHOOTING SPORTS PARK
Seattle, WA · 27 served
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Is Seattle, WA tap water safe to drink?
15 public water systems serve Seattle, WA, with 19 health-based violations in the last 5 years across them. The worst Tap Grade among them is F.
Does Seattle's water have lead in it?
The most recent 90th-percentile lead sample is 2 ppb, versus the EPA action level of 15 ppb.
Has PFAS been detected in Seattle's water?
These systems were tested under UCMR5 and no PFAS was detected above the reporting limit in the analytes we track.
Source: EPA SDWIS/ECHO · Data as of 2026Q2