Okanogan County Noxious Weed Control Board

149 3rd Ave. N., P.O. Box 791, Okanogan, WA 98840

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Noxious Weed List 

The Washington State Noxious Weed List is updated every year by the State Weed Control Board.  It contains all of the Statewide Class A noxious weeds.  The Class A weeds are of very limited distribution in Washington State and are in a category of mandatory eradication of the entire plant. 

The State List also contains a Class B category of weeds and it is from this portion of the list where each county gets its list of Class B Designate species.  The Class B Designates are a bit more widespread, but still considered required control.  However, currently this means that you are only required to stop seed production.

Class C noxious weeds are fairly widespread and it is not considered feasible to require eradication.  We do recommend that you do control these species to stop further spread, however we do not require control unless we get complaints from adjacent property owners.

Those species on the State list known to be in Okanogan County:

Okanogan Class A—Eradication required.

Garlic mustard Mirabilis (Wild Four o'clock) Syrian bean-caper  
Meadow clary Spurge flax    


Okanogan B Designates—Required to stop seed production.

Common bugloss Leafy Spurge Tansy ragwort Yellow Starthistle
Eurasian water-milfoil (Along Okanogan River) Perennial pepperweed Thistle-Musk  
Hawkweed (Non- native) species Rush Skeleton-weed  Thistle-Plumeless  
Hoary Alyssum Scotch broom Thistle-Scotch  

For a complete list of Washington State noxious weeds, go to the State Noxious Weed Control Board Web site.