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

Tips for reducing household sewer odors

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

wrenchThe “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.

wrenchDon’t make any plumbing hook-up straight into the house side sewer—always install a “p” trap.

wrenchPeriodically run water through drains that aren’t used often, such as floor or garage drains or utility sinks.

wrenchMake sure all plumbing vents go outside the house. Standard plumbing per code will ensure proper venting.