Marin County Code Chapter 6.60 (Noxious Weeds) and Marin County Fire Code § 325.5 together prohibit allowing noxious weeds or hazardous vegetation to grow on a parcel in unincorporated Marin. The Agricultural Commissioner and Fire Marshal share enforcement.
Marin County addresses weeds through two parallel ordinances. Chapter 6.60 of the Marin County Code (Title 6 - Public Peace, Safety and Morals, Noxious Weeds) is administered by the Marin County Agricultural Commissioner / Department of Agriculture, Weights & Measures (AWM), which carries out the County's invasive and noxious weed management program including roadside spraying, biological control, and inspection. In parallel, Marin County Fire Code Ord. 3775 § 325.5.1 makes it unlawful to allow weeds or other vegetation that constitutes a fire hazard to exist on any parcel, and § 325.6 / § 325.9 set general abatement requirements and notice/cost-recovery procedures. Property owners in unincorporated Marin are responsible for keeping noxious and invasive weeds (including French broom, Scotch broom, yellow star-thistle, and other species on the Marin County Parks priority weeds list) under control on their land.
Under the Fire Code, failure to abate after notice triggers County-contracted clearing with costs and an administrative fee billed to the owner and potentially recorded as a lien. Under Ch. 6.60 and state Food & Agricultural Code provisions enforced by the Agricultural Commissioner, refusal to cooperate with weed abatement can result in administrative penalties and civil cost recovery. Repeated or willful violations may be charged as infractions or misdemeanors.
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