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Note: King County Weed Board's Annual Weed List Hearing will be held on Wednesday, January 24, 2018, 3:30 pm at the Mercer Island Library (see Meeting Schedule) - public input is encouraged and everyone is welcome to attend!

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.

Identify and learn about weeds and invasive plants

Locate noxious weeds in King County

Report an infestation

Control noxious weeds


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 in the King Street Center Building at 201 S. Jackson St., Suite 600, Seattle, WA 98104.


Find information on noxious weed identification and control in multiple languages:

Español (Spanish)

Tiếng Việt (Vietnamese)

中文: 简体版 (Simplified Chinese)

Af-Soomaali (Somali)

русский язык (Russian)