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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

History

Kids at beach  Polluted beach

Forty years ago, Lake Washington was too polluted for swimming.

Sewer pipes large enough for a car to drive through.  Sewer pipe lined up

In one of the first and largest environmental cleanups in history, people voted to save the lake by building a sewage treatment system.

Adults at beach

Now, Lake Washington is one of the cleanest urban lakes in the world.

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

Related information

1958 Metro campaign poster
History of King County's Regional Wastewater Treatment Utility