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Capital improvement projects

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

Wastewater tutorial

The Problem -- population growth

 growth problem

  • As the region grows, we will need more capacity in the sewage treatment system. New connections to the sewer system include new construction of homes and businesses as well as existing homes that move off of septic systems.

  • To protect public health and the environment we must plan and build new facilities before they are needed.

History | Current Wastewater System | The Problem 
The Solution | The Future