Holiday closure Monday May 28: Most county offices will be closed in observance of Memorial Day.

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: 206-684-1280
Fax: 206-684-1741
Telecommunication device for the deaf (TTY): 711

Get Directions to our office location in Seattle, Washington.

Staff Contacts
Puget Sound shoreline next to the West Point Treatment Plant, Seattle

Project phases and how King County works with the public

All system and project phases

What happens during a King County project? How is the public involved? Learn more by clicking on a specific "phase" on the banner above or the links below.

System planning | Project planning | Project design | Project construction | Facility operations

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Facility operation phase Project construction phase Project design phase Project planning phase System Planning phase

Community Engagement Guide
King County has developed a Community Engagement Guide to promote effective engagement and customer service with all county communities. This guide builds on the county's Strategic Plan as well as the Equity and Social Justice Ordinance.

News releases

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