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Wastewater Treatment

King County, Washington

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: 206-477-5371
Fax: 206-684-1741
Telecommunication device for the deaf (TTY): 711

Get Directions to our office location in Seattle, Washington.

Staff Contacts

Sewage spill in houseSewage spill response - in your home

Clean up safely

Use a bleach solution to disinfect hard surfaces, sponges and mops that come into contact with sewage.
Use a bleach solution to disinfect hard surfaces, sponges and mops that come into contact with sewage

  • Wear rubber boots and gloves.
    • Disinfect all mops, sponges and brushes.
    • Launder clothes worn during cleaning separately from other laundry.
  • Clean and disinfect contaminated surfaces.
    • Plumbing fixtures and vinyl, metal, wood and concrete surfaces should be cleaned thoroughly with hot water and a mild detergent, such as dish detergent, and then disinfected with bleach solution.
    • Mix one part of liquid household bleach with 10 parts of water (1:10). Dampen contaminated surfaces and allow them to air dry.
  • Remove and discard porous materials.
    • Upholstered furniture, loose rugs and drapery can not be salvaged and must be discarded properly.
    • Remove and replace lath, plaster, plasterboard and drywall saturated to the point of being soft to the touch.
    • Wall to wall carpeting and pad cannot be reliably disinfected, and must be removed and sent to a local transfer station.

The Washington State Department of Health's guidance for cleaning up a sewage spill (external link) is also available in Spanish, Chinese, Korean, Russian and Vietnamese