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Noxious weeds

King County, Washington

To offer a suggestion or report an error on the King County Noxious Weeds website, please contact Sasha Shaw, education specialist.

Noxious weed information and services

Noxious weeds in King County

Noxious weeds are a danger to our environment and the economy. These introduced species cost our region millions of dollars in lost agricultural production, environmental degradation and added maintenance costs.  Once invasive plants spread to natural areas, they harm native plants and wildlife and can be impossible to eradicate.

Quick Links

poison-hemlock - click for more information
tansy ragwort - close for more information
Tansy Ragwort
giant hogweed-click for more information
Giant Hogweed
Himalayan Blackberry - Rubus armeniacus - click for ID and control information
Garlic mustard

Identify and learn about weeds and invasive plantsClick to report a noxious weed infestation in King County, Washington

Report an infestation

Please help us locate regulated Class A, B, and C noxious weeds in King County so we can work with the property owners and public agencies responsible to ensure the weeds are controlled effectively. We need your help to find early infestations while we still have a chance to stop them.

Control noxious weeds


About King County Noxious Weed Control Board

King County Noxious Weed Control Board Districts - click for Weed Board informationThe King County Noxious Weed Control Board is appointed by King County Council to carry out the mandates of the Washington State noxious weed control law, Chapter 17.10 RCW.  The board members are volunteers who reside in King County and who have an interest in and knowledge about agriculture and/or the natural resources of the county.  Each board member represents one of five King County weed districts.

About us

The King County Noxious Weed Control Program works throughout the county to prevent and reduce the economic, environmental and social impacts of noxious weeds in King County, Washington. The program's focus is to provide education and technical assistance to landowners and public agencies to help them find the best control options for noxious weeds on each site and to reduce the overall impact of noxious weeds throughout the county.

  • About us - Noxious Weed Control Program - describes who we are, what we do and frequently asked questions
  • Contact us with comments - we would like to hear from you about how our staff performed, how we responded to noxious weed reports, if our information is helpful, and anything else you would like to share with us about our program and our work.

To contact us, please see the staff directory for the King County Noxious Weed Control Program, call 206-477-WEED (206-477-9333) or send us an e-mail.  Program offices are located at 201 S. Jackson St., Suite 600, Seattle, WA 98104.