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King County investigating a brief overflow at Heathfield pump station


King County is investigating the cause of an apparent equipment malfunction at a pump station that led to a brief wastewater spill into Lake Sammamish on March 24.


King County crews are investigating a brief overflow into Lake Sammamish that occurred Sunday, March 24 at the Heathfield pump station at 3801 W Lake Sammamish Parkway SE in Bellevue.

The pump station went out at approximately 4 a.m. A King County wastewater operator quickly responded to the pump station by 4:21 a.m. and by 4:23 a.m. was able stop the overflow by containing and holding additional wastewater within the sewer system.

A cleaning contractor is on location. We are taking precautions and are taking water quality samples from Lake Sammamish and have notified regulatory agencies. The unstaffed pump station moves area wastewater to the South Treatment Plant.

King County reported the overflow to health and regulatory agencies, is monitoring water quality, and has posted signs warning people to avoid contact with the water over the next several days as a precaution to protect public health.


• DNRP Newsroom

Norm Mah, 206-263-0195

About the King County Wastewater Treatment Division
King County’s Wastewater Treatment Division protects public health and enhances the environment by collecting and treating wastewater while recycling valuable resources for the Puget Sound region. The division provides wastewater treatment services to 17 cities, 17 local sewer districts and more than 1.7 million residents across a 420-square-mile area in King, Snohomish and Pierce counties.