Skip to main content
Most King County offices will be closed on Monday, for Memorial Day.  
King County logo


Natural Resources and Parks
Public Affairs

Wastewater pump station overflows in West Seattle as a result of neighborhood power outage


A King County wastewater pump station in West Seattle that was affected during a neighborhood power outage discharged combined stormwater and wastewater flows into Puget Sound for about 25 minutes late in the afternoon on Thursday, Feb. 16.


A brief power outage in the West Seattle neighborhood late on Thursday afternoon, Feb. 16, resulted in an overflow of stormwater combined with wastewater from King County’s 63rd Avenue Pump Station.

The pump station, which is designed to send flows to the nearby Alki CSO facility, discharged an estimated 330,000 gallons of stormwater and wastewater during the power outage, which lasted from approximately 4:45 p.m. to 5:05 p.m. Thursday.

Crews brought an emergency generator that is stored at the Alki CSO facility to the pump station, but main power was quickly restored.

King County has reported the overflow to health and regulatory agencies. King County employees will post signs in the vicinity of the pump station at first light on Friday, Feb. 17, and employees with the County’s Environmental Lab conducted water quality monitoring.

Information about King County’s CSO treatment facilities is available online at

This release is also posted on the Department of Natural Resources and Parks website,