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Completed – Fall 2009

Construction of the King Street Odor Control Facility began Spring 2008 and was completed in Fall 2009. The new odor control facility reduces corrosive, odor-causing gases in the Elliott Bay Interceptor, a major wastewater conveyance pipe beneath Occidental Ave and Second Ave S in Seattle, and addresses a long-standing odor nuisance for the public.

The bulk of the King Street Odor Control Facility is located underground, only an air vent stack and a small electrical building are visible above ground. The above ground structures were designed to compliment the design features of the near by Weller St Bridge (located south of site). The King Street Station  is located directly north of the site.

rsz_4266482571_ceb6bdf0bc_oKing Street Odor Control Facility

View more photos on our Flickr site  .

24-hour emergency and odor reporting:

Contact West Point Treatment Plant at  206-263-3801.

King County worked with the following organizations throughout the design and construction process:

  • City of Seattle
  • Pioneer Square Preservation Board
  • Washington State Department of Transportation
  • Washington State Public Stadium Authority
  • Amtrak

How odor is controlled

The new odor control facility is equipped with strong fans and odor control equipment that pulls foul smelling gases out of the existing sewer pipe and transports them to an odor “scrubber”. Gases in the “scrubber” then pass through a carbon filter which removes odor causing compounds. The compounds are absorbed by the carbon and the cleaned air is released to the environment.

Cross section of the King Street Odor Control facility


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