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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

Conveyance/treatment – sending flows from the basin to an existing treatment plant

Increase Pumping and Conveyance Capacity
View handout (PDF file)

Pumping capacity is increased by expanding existing pump stations or building new pump stations and installing new pipelines to convey combined flows out of the basin to existing treatment facilities.

Key considerations

  • All flow is sent to existing plants for treatment
  • Construction is required over a much broader area
  • Need to assure that problem is not shifted to a different downstream location
  • Sufficient space required for new or expanded facilities