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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

North King County/South Snohomish County projects

North Creek Interceptor 

The North Creek Interceptor Project includes completing construction of approximately 10,000 feet of new sewer line, along with connecting this new line to previously constructed pipe. This project is needed to expand the capacity of part of the County's North Creek Interceptor sewer line, to accommodate the projected growth and flows from southwestern Snohomish County. Construction began in 2015 and should take 2 years to complete.