Utah Code § 4-17-107

(1) A county weed control board is responsible, under the general direction of the county executive, for the formulation and implementation of a county-wide coordinated noxious weed control program designed to prevent and control noxious weeds within the board's county. (2) A county weed control board is required, under the general direction of the board's commission, to cooperate with other county weed control boards to prevent and control the spread of noxious weeds. (3) (a) A county legislative body may declare a particular weed or competitive plant, not appearing on the state noxious weed list, a county noxious weed within the board's county. (b) A county executive, with the approval of the county legislative body, may petition the commissioner for removal of a particular noxious weed from the state noxious weed list. (c) The county legislative body may not approve a petition of the county executive to the commissioner to remove a noxious weed unless the county legislative body has first conducted a public hearing after due notice.