Invasive Plant Rules in Lewis County, WA (2026)
1 rule for unincorporated Lewis County, Washington.
Verified from official government sources
Note: These county rules apply to unincorporated areas of Lewis County. If you live within an incorporated city, that city's own rules apply: see the city list below.
Prohibited Species
In unincorporated Lewis County, the Lewis County noxious weed control board designates prohibited plants on the county's noxious weed list under Lewis County Code Chapter 3.55. The board can add a 'select species' requiring mandatory containment only after holding a public hearing and updating its rules and regulations, and every real property parcel pays an annual tax that funds enforcement.
Lewis County Noxious Weed Species Rules
Some RestrictionsLewis County Code § 3.55.030, § 3.55.040
"Noxious weed" means a plant listed on the Lewis County noxious weed list adopted pursuant to RCW 17.10.090. ... Any species of noxious weed may be designated by the noxious weed control board as a select species in its rules and regulations. Prior to designating a select species, the noxious weed control board shall hold a public hearing and shall comply with the requirements for amending the ...
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