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Unexpected power failure leads to overflow at King County’s Sunset Pump Station


An unexpected power failure early Monday afternoon at King County’s Sunset Pump Station caused a sewage overflow that prompted temporary closure of nearby Vasa Park beach on Lake Sammamish. The station is operating normally and health and regulatory agencies were notified.


Crews with King County’s Wastewater Treatment Division responded quickly to an overflow that occurred shortly after noon on Monday at the Sunset Pump Station, located at 3730 West Lake Sammamish Parkway in Bellevue.

An apparent fuse failure caused a power outage that shut down pumping equipment, causing sewage to overflow from the pump station into nearby Vasa Park. Crews restored power in about an hour and the pump station is now operating normally.

To protect public health, King County posted affected areas at Vasa Park as closed, took water quality samples, and notified health and regulatory agencies.

The Sunset Pump Station has been serving the West Lake Sammamish Area for nearly 50 years.

Over the next few years, King County plans to invest $70 million in major capital improvements that include upgrades to the Sunset Pump Station, which will modernize equipment and increase system reliability.

More information about the project is available online.