11834 Tilley Rd. S.
Olympia, WA 98512
Ramiro Chavez, Department Director and liaison to the Board of County Commissioners
Thurston County Noxious Weed Control Board Members:
Gene Little, Chair
Noxious Weed and Lake Managment Staff
Rick Johnson, Manager
Mary Jo Seery, Lead Weed Technician
Janie Civille, Aquatic Resource Specialist
Dan Reynoldson, Weed Technician
Angela Celestine, Office Assistant
Our mission is to protect the citizens, the natural resources, and the agricultural resources of the County from the degrading impact of invasive, noxious weeds.
Noxious weeds threaten public health, the environment, wildlife habitat, native plants, agriculture areas, and recreational areas.
Thurston County Noxious Weed Control is monitoring for 42 species of noxious weeds which are targeted for control out of a list of 99 designated by the State of Washington. The remaining 57 species have not yet been found in Thurston County, but are targeted annually through early detection surveys.This preventative effort to find species while they are limited, prevents them from becoming widespread. Prevention is the most effective control strategy. All species of noxious weeds are non-native.
A risk assessment is used in prioritizing the weed list. To view our rationale, go to the Risk Assessment Chart. To see photographs of those species designated for control in Thurston County, go to the Noxious Weed List.
Species of Concern
In addition to the species listed on the County noxious weed list, six species pose a significant threat due to their invasive traits: spartina, kudzu, garlic mustard, hydrilla, water primrose and flowering rush. These species are not yet found in Thurston County.
In addition to the species listed above, there are weeds of special concern because of their aggressive and invasive natures.These species are already known to be widespread in Thurston county. These include:
Evergreen blackberry (Rubus laciniatus), Himalayan blackberry (Rubus armeniacus), Eurasian watermilfoil (Myriophyllum spicatum), Policeman’s Helmet (Impatiens glandulifera), Canada thistle (Cirsium arvense), Scotch broom (Cytisus scoparius), yellow nutsedge (Cyperus esculentus), and the invasive cultivars of English Ivy: Hibernica” (Hedera hibernica), “Baltica” (Hedera helix), “Pittsburg” (Hedera helix) and “Star” (Hedera helix).
Disposal of Noxious Weeds
Thurston County Noxious Weeds Map
Click the image above to go to the Noxious Weeds Map on the Thurston County Geodata web site. Use this map to see which known noxious weed species are in your neighborhood. Here's how:
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