A95/100
KING COUNTY WATER DISTRICT #20 — Water Quality Report 2026
Serving 38,974 people · Washington
Water Source
Purchased Surface Water
County
—
System ID
WA5338950
Violations
1
Contaminant Test Results
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2003.
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 KING COUNTY WATER DISTRICT #20
Is KING COUNTY WATER DISTRICT #20 water safe to drink?
KING COUNTY WATER DISTRICT #20 water receives a grade of A (95/100), which is considered excellent. Out of 68 contaminants tested, none exceed EPA legal limits. The water meets federal safety standards.
What contaminants has KING COUNTY WATER DISTRICT #20 detected?
68 contaminants were tested in KING COUNTY WATER DISTRICT #20's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does KING COUNTY WATER DISTRICT #20 have any EPA violations?
Yes, KING COUNTY WATER DISTRICT #20 has 1 EPA violation(s) on record, with the most recent in 2003. Violation types include MCL. 1 are health-based violations.
How many people does KING COUNTY WATER DISTRICT #20 serve?
KING COUNTY WATER DISTRICT #20 serves approximately 38,974 people, Washington.
What type of water does KING COUNTY WATER DISTRICT #20 provide?
KING COUNTY WATER DISTRICT #20 sources its water from purchased surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is WA5338950.
How does KING COUNTY WATER DISTRICT #20 compare to other utilities in Washington?
KING COUNTY WATER DISTRICT #20 scores 95/100 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.