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Tansy Ragwort, Class B Noxious Weed

Use the form below to report infestations of regulated noxious weeds in King County, Washington so we can work with the property owners or public agencies responsible to ensure the weeds are controlled effectively.  If you are unsure if the weed you are reporting is regulated in King County, or for more information on this form, please contact our office by email at or by phone at 206-477-WEED (206-477-9333).

Click on the question marks to get weed identification help and interactive maps.

Sending photos

If you would like to submit a photo of the weed or location, please email the noxious weed program, attach the photo file and reference your weed report. If the photo is not digital, you can mail it to: King County Noxious Weed Program, 201 S. Jackson St., Suite 600, Seattle WA 98104. Please include a note that this is for a weed infestation report along with the weed site information.

Enter report here

The Weed name and Location fields are required.

Please fill in your name and contact information in case we need more specific directions, or if you would like a follow-up on what we found. This information will not be shared with anyone if you would prefer to remain anonymous.



Weed identification photos and descriptions

Note: If you are concerned about a non-regulated noxious weed species such as English ivy or blackberry or a weed of concern such as bindweed or holly, please contact us by email instead of using this form and we can provide information on the species and how to control it. In most cases, we aren't tracking locations of non-regulated weeds, and property owners and public agencies are not required to control non-regulated noxious weeds. Please contact us ( if you would like more information.

Related information

Related agencies

Program offices are located at 201 S. Jackson St., Suite 600, Seattle, WA 98104. To contact staff, see the Noxious Weed Control Program Directory, send an email, or call 206-477-WEED (206-477-9333).