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Crews respond to overflow at the South Mercer Pump Station


King County's South Mercer Pump Station is operating normally following a mechanical failure that caused a four-hour overflow on Thursday afternoon.


Sewer utility crews responded Thursday afternoon to an overflow from King County’s South Mercer Pump Station.


An undetermined quantity of wastewater overflowed into Lake Washington for about four hours from the station, which is located at the intersection of E. Mercer Way and S.E. 72nd St. on Mercer Island.


The overflow was caused by a mechanical failure that was corrected shortly after workers arrived on site. The station is now operating normally.


King County will notify health and regulatory agencies, sample water quality and post signs warning people to avoid contact with the water over the next several days as a precaution to protect public health.