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
Brightwater Treatment System Banner

Current Activities

The Brightwater project is currently under construction at a number of locations. These include the portals where conveyance tunneling is centered and the treatment plant site. For more information see:

For construction-related questions and urgent issues

Contact the construction information line at 206-205-5989 (remember to dial 911 for emergencies)

Contact us if you need more information about Brightwater

King County Brightwater Project

22505 State Route 9
Woodinville, WA 98072
E-mail: Brightwater
Phone: 206-263-9453
TTY Relay: 711

Driving directions to Brightwater project office.