The power surge caused the pump to shut down and could not restart because the relay malfunctioned. Crews stopped the overflow within 15 minutes after the West Point Treatment Plant computerized monitoring system showed the pump had stopped. The pump was restarted and the relay switch fixed. The health department and the State Department of Ecology were contacted immediately. A technical crew was dispatched to take water samples to test for contamination at the pipe and at public beaches above and below the outfall site.
Laboratory tests show good water quality at all sampling sites.
Work is planned to increase the storage capacity of sewage at the pump station in the next five years to better manage sewage flows during storms. The Hidden Lake Pump Station handles sewage from Shoreline, Hidden Lake and parts of the Highlands. By visiting this and other King County web pages, you expressly agree to be bound by terms and conditions of the site.