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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

Protecting our assets

Employees install coatings, linings and sealants on the interior of a pipeline
Employees install coatings, linings and sealants to extend the life of our pipelines and equipment.

It would cost about $20 billion to build King County's wastewater system from the ground up today, and the value of our facilities as they now stand is estimated at about $4 billion.

Naturally, we put a high priority on managing and maintaining our buildings, treatment plants, pump stations, manholes, pipelines, as well as the property surrounding them.

The county's Asset Management Program oversees inspection of the regional treatment system, repairing and replacing aging facilities and developing plans to address ongoing system issues


Inspecting a pipe for corrosion
One of our biggest ongoing asset management challenges is directly related to the age of the system – pipe corrosion. Investments in repairing and rehabilitating these aging pipes will help prevent system failures, overflows and costly emergency repairs.
Crews use sonar inspections and closed circuit cameras to detect pipe deterioration
Sonar inspections and closedcircuit cameras help inspection crews detect pipe deterioration.