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Storm, power failure causes brief pump station overflow


An early morning power failure at King County’s Henderson Pump Station caused a brief wastewater overflow into Lake Washington near Beer Sheva Park in Seattle’s Rainier Beach neighborhood. The overflow was reported to health and regulatory agencies, and King County will monitor water quality in nearby Lake Washington over the next several days.


Crews with King County’s Wastewater Treatment Division responded early this morning to a power failure and brief overflow from the South Henderson Pump Station, which is located at 5327 S. Henderson St. in Seattle’s Rainier Beach neighborhood.

A strong storm that rocked the area last night caused power interruptions around 3 a.m. that shut down the station’s pumping equipment, which had to be manually reset by utility workers. It’s estimated about 90,000 gallons of wastewater and stormwater overflowed into Lake Washington for 19 minutes.

King County reported the overflow to health and regulatory agencies and posted signage warning people to avoid contact with the water in Lake Washington at Beer Sheva Park where the overflow occurred. 

Employees with King County’s environmental laboratory will sample and monitor water quality for the next few days.