States/WA

Sewer overflows in Washington

Sewer overflow record — reported spills, the worst utilities, and how often overflows reached waterways in Washington.

Reported events
35
Total volume
76K gal
Reached waterways
0(0%)
Latest event
Feb 18, 2026

Worst utilities in Washington

Ranked by number of reported overflow events.

#UtilityEventsVolumeReached water
1Joint Base Lewis-Mcchord Sanitary Sewer System3376K gal0
2Puyallup Sanitary Sewer System214 gal0

Biggest spills in Washington

The largest single reported overflow events.