Noxious Weed List
The following is a list of species known to be present or have the potential to infest Thurston County. It is approved and updated annually by the Thurston County Weed Board.
For inquiries about adding species to the list, contact tcweeds@thurston.wa.gov.us
Noxious Weed Classifications
In accordance with WAC 16-750, eradication is required for these species.
Class A Species are generally:
- Newly introduced to the state
- Limited in distribution/ not yet established
- Required for control by landowners
In accordance with WAC 16-750, control is required for these species.
Class B Species are generally:
- More established than Class A
- Still relatively limited in distribution within regions of Washington State
- Required for control by landowners
Control is defined as routinely removing propagules or reproductive structures of the plant to prevent their spread. The goal with Class B is to prevent them from moving into unestablished areas.
In accordance with WAC 16-750, control is required when a Class C is selected by a local weed board.
Class C Species are generally:
- Widely established within Washington State
- May be selected for control within particular regions depending on local interest
Control is defined as routinely removing propagules or reproductive structures of the plant to prevent their spread. The goal with Class C is to prevent them from moving into unestablished areas.
