A84/100
SEATTLE PUBLIC UTILITIES — Water Quality Report 2026
Serving 1,091,904 people · Washington
Water Source
Surface Water
County
—
System ID
WA5377050
Violations
5
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.004 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2015.
Understanding violation severity
Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.
Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly
Frequently Asked Questions About SEATTLE PUBLIC UTILITIES
Is SEATTLE PUBLIC UTILITIES water safe to drink?
SEATTLE PUBLIC UTILITIES water receives a grade of A (84/100), which is considered excellent. Out of 76 contaminants tested, none exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has SEATTLE PUBLIC UTILITIES detected?
76 contaminants were tested in SEATTLE PUBLIC UTILITIES's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does SEATTLE PUBLIC UTILITIES have any EPA violations?
Yes, SEATTLE PUBLIC UTILITIES has 5 EPA violation(s) on record, with the most recent in 2015. Violation types include TT, MR. 2 are health-based violations.
How many people does SEATTLE PUBLIC UTILITIES serve?
SEATTLE PUBLIC UTILITIES serves approximately 1,091,904 people, Washington.
What type of water does SEATTLE PUBLIC UTILITIES provide?
SEATTLE PUBLIC UTILITIES sources its water from surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is WA5377050.
How does SEATTLE PUBLIC UTILITIES compare to other utilities in Washington?
SEATTLE PUBLIC UTILITIES scores 84/100 with a grade of A (excellent). This places it among the higher-performing utilities in the state. Visit our Washington state page for a full comparison of water systems.