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Wastewater Treatment

King County, Washington

For questions about the Wastewater Treatment Division website, please send an e-mail message or contact us at:

King Street Center
201 S. Jackson St., Suite 500
Seattle, WA 98104-3855
Phone: 206-477-5371
Fax: 206-684-1741
Telecommunication device for the deaf (TTY): 711

Get Directions to our office location in Seattle, Washington.

Staff Contacts

Magnolia Wet Weather Storage Facility at Smith Cove

Learn more about facility operation

Facility operating

The Magnolia Wet Weather Storage Facility at Smith Cove began storing excess flows of stormwater and sewage in late 2015. The facility’s 1.5 million-gallon underground storage tank helps keep sewage and stormwater out of Puget Sound during storms.

24-Hour Emergency and odor reporting: contact West Point Treatment Plant at 206-263-3801.

Magnolia Wet Weather Storage Facility at Smith Cove

Project vicinity map
South Magnolia basin and project location.

King County is protecting Puget Sound

This facility is part of King County’s plan to help protect Puget Sound by keeping sewage and untreated stormwater out of Puget Sound. The new CSO Control Facility will reduce overflows from the sewer system to Elliott Bay to no more than one per year on a long-term average.