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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

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Puget Sound shoreline next to the West Point Treatment Plant, Seattle

The following chart illustrates what gets removed with different wastewater treatment technologies. The membrane bioreactor planned for the Brightwater and Carnation treatment plants remove more than conventional sand filtration. Even this advanced treatment process is not expected to remove all contaminants or EDCs. Higher levels of removal are possible but very expensive.

filtration treatment processes

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