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King County is committed to odor control.

However, we cannot guarantee that there will be no odors in our existing system.

Occasionally, equipment will need to be shut down for clean up, preventive maintenance, or repairs. Please call the odor hotline if you experience odors and we will do everything we can to restore our high level of odor control.

Tips for reporting odors

  • Try to locate the source of the odor. Odors could be coming from local sewers or King County’s system. Many King County sewer manholes have "METRO" on the lid.
  • Report the odor as soon as possible. Give the location and the time it occurred. This information will help locate the odor and aid in the investigation.
  • For odors occurring in homes, businesses, and local sewer pipes and storm drains, call your local sewer agency. The number to your local agency can be found in your sewer bill.
  • For odors that can't be specifically located, call the closest King County treatment plant's odor control hotline for assistance. 

King County wastewater odor control hotline 

 Many King County sewer manholes have 'METRO' on the lid. Try to locate the source of the odor. Odors could be coming from local sewers or King County’s system. Many King County sewer manholes have "METRO" on the lid.
Contact us

Brightwater Treatment Plant
(includes influent pump station at North Creek Parkway & Northeast 19th Street, Bothell)

24-hour odor control hotline:
 206-263-9500

West Point Treatment Plant

24-hour odor control hotline:
 206-263-3801

South Treatment Plant
(includes Carnation and Vashon plants)

24-hour odor control hotline:
 206-263-1760

Other agency contacts

Puget Sound Clean Air Agency:
 206-343-8800

To identify and contact your local sewer agency, check your sewer bill.

Tips for reducing household sewer odors
  • The “p” trap under every sink, tub, and floor drain is a water barrier that keeps sewer odors from coming back into your house. Normal use will keep the “p” traps full of water.
  • Don’t make any plumbing hook-up straight into the house side sewer—always install a “p” trap.
  • Periodically run water through drains that aren’t used often, such as floor or garage drains or utility sinks.
  • Make sure all plumbing vents go outside the house. Standard plumbing per code will ensure proper venting.

sinkAfter water drains from a sink or tub, the “p” trap remains filled, thus preventing gases from entering your home.