Washington Noxious Weed Control Owner Duty

RCW 17.10.140 splits the owner's duty by weed class. Every owner must eradicate all Class A noxious weeds outright, and must control and prevent the spread of Class B weeds designated for control in that region, plus any Class B or C weeds the county has listed as a locally mandated control priority. Forestland owners get a narrower version of the same duty under subsection (2): they only have to chase Class B/C weeds within 1,000 feet of adjacent land uses, within 25 feet of privately owned roads (unless properly abandoned under WAC 222-24-052), within 200 feet of navigable rivers, gravel pits, log yards, and staging areas, or for a single five-year window after a harvest.

Enforcement runs through the county noxious weed control board under RCW 17.10.170. When a board finds noxious weeds present and the owner isn't taking prompt, sufficient action under § 17.10.140, it sends written notice by certified mail identifying the weeds, ordering control action, and setting a deadline of at least ten days from issuance, the certified mailing itself creates prima facie proof of notice. If seed or propagule dispersal is imminent, the board can act just 48 hours after the owner is presumed to have received notice, and if the same owner already got a notice in a prior growing season, the board can order removal of all above-ground plant parts at whatever point in the season is most effective, dispersal timing aside.

If the deadline passes without action, the board may control the weeds itself and bill the owner (RCW 17.10.170(3)); the unpaid amount becomes a lien that the county auditor records, bearing 12 percent annual interest, and the board can recover its attorneys' fees in the same action. Counties can instead collect the lien like a delinquent property tax if it's still unpaid 30 days after the owner was notified and no appeal was filed under RCW 17.10.180.

The board's enforcement reach includes a right of entry under RCW 17.10.160: agents may inspect and collect specimens after attempting to notify the owner, and if the owner refuses access, the board can get a superior or district court warrant. Entry performed without reasonable care creates civil liability for the board, but anyone who prevents or threatens to prevent lawful entry is guilty of a misdemeanor.

Failing to act on a certified-mail notice draws a civil infraction under RCW 17.10.230, 17.10.310, and 17.10.350, capped at $1,000 per the state noxious weed control board's penalty schedule and due immediately (courts may grant up to a 30-day extension); not paying it is itself a misdemeanor. The county board can also control the weeds directly and lien the property for its cost plus attorneys' fees at 12 percent annual interest (RCW 17.10.170(3)-(4)), collectible like a delinquent property tax if unpaid 30 days after notice and unappealed. Blocking an agent's warrant-backed entry under RCW 17.10.160 is a separate misdemeanor.