Which Weeds-Where?

 Noxious Weeds in Thurston County - Map 
The link above will take you to the Geodata Thurston County map.  Use this map to see which known noxious weed species are in your neighborhood. Here's How:

• Select the search tab to find your property either by address or parcel number.

• Select the layers tab, under miscellaneous on the list of possible layers, check the box next to the noxious weed layer to turn on.

• Known noxious weed species symbols will then appear, use the legend tab to identify symbols of the species of noxious weeds that are depicted.

Maps are complex and fairly large in size, depending on your connection speed, it may require a generous and patient download time.

Thurston County Noxious Weed Control is monitoring for 40 species of noxious weeds which are targeted for control out of a list of 86 designated by the State of Washington. The remaining 46 species have not yet been found in Thurston County, but are targeted annually through early detection surveys. All species of noxious weeds are non-native. 

Noxious weeds threaten public health, the environment, wildlife habitat, native plants, agriculture areas, and recreational areas. 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 .

Agency staff are surveying for the remaining 46 species not yet known to exist in Thurston County. This preventative effort to find  species while they are limited,  prevents them from becoming widespread. Prevention is the most effective control strategy . 

The weed program is focused on weeds of limited distribution where there is a possibility of eradication and preventing or reducing populations of noxious weeds to levels where impacts or injuries are low. 

The following problem weeds are found in Thurston County. These species are a  problem because of their invasive nature, but are not listed for control due to population densities so high that eradication is not possible:

Canada thistle (Cirsium arvense), Eurasian Watermilfoil,  Scotch broom (Cytisus scoparius), English Ivy,  Policeman's Helmet (Impatiens glandulifera), and Yellow Flag Iris (Iris psuedacorus).

Address questions or comments  to: tcweeds@co.thurston.wa.us