Idaho Noxious Weed Law Universal Landowner Duty

Idaho Code 22-2407 makes it the duty of all landowners to control noxious weeds on their land in accordance with rules promulgated by the Idaho Department of Agriculture director. The state maintains an official noxious weed list under 22-2402 covering invasive species like leafy spurge, knapweed, rush skeletonweed, and yellow starthistle. Counties enforce the law through county weed superintendents who may issue notices, enter property to inspect, and perform control work at the landowner's expense if compliance fails. Cost recovery liens may attach to property. While counties may add to enforcement, none may exempt landowners from the underlying state duty.

Noncompliance allows the county to perform weed control and bill the owner. Unpaid charges become liens on the property; willful violations are misdemeanors.