Odor Control --
Working in your neighborhood to protect public health and the environment

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.

For more information

• Odor Control brochure, (PDF file, 529KB)
• Please contact Doug Marsano by e-mail or at 206-684-1235.

For questions about the Wastewater Treatment Division Web site, please send an e-mail message. For general information about the division, contact us at:

Department of Natural Resources and Parks
Wastewater Treatment Division
201 S. Jackson St., Suite 505
Seattle, WA 98104-3855
Phone: 206-684-1280
Fax: 206-684-1741
Telecommunication device for the deaf (TTY): 711

Updated: Dec. 7, 2006