Noxious Weed Classifications

The Washington State Noxious Weed Board classifies noxious weeds into the following three categories: 

Class A: Eradication will be enforced

Class A weeds are limited in number and distribution in Washington.  Our goal is to completely eradicate them and prevent them from becoming established.  Landowners in every county are required to eradicate Class A weeds.

Eradication is defined as eliminating the entire plant including the roots. 


Class B: Control will be enforced

Class B weeds are widespread in some areas of the state, but are small in number, or absent in other areas.  Our goal is to control the spread of these weeds and to reduce their numbers.  Landowners are required to control all designated Class B weeds.

Control is defined as the prevention of seed production


Class C:  Control is recommended 

Class C weeds are usually widespread and abundant.  Our policy is to educate and encourage landowners to control these noxious weeds.