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Most King County offices will be closed on Monday, May 28, for Memorial Day.  
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King Street Center (division headquarters)

201 S. Jackson St.
Seattle, WA 98104-3855
  206-477-5371; fax  206-684-1741

5th floor – Wastewater Treatment Division

View directions and map.

Brightwater Center – education and community center

22505 State Route 9 S.E.
Woodinville, WA 98072-6010
  206-263-9412 or  206-263-8930

View directions and map (Brightwater Center)

View Google Maps