Utah Code § 4-17-110

(1) If the owner or person in possession of the property fails to take action to control or prevent the spread of noxious weeds within five working days after the property is declared a public nuisance, the county may, after reasonable notification, enter the property, without the consent of the owner or the person in possession, and perform any work necessary, consistent with sound weed prevention and control practices, to control the weeds. (2) (a) If the county controls weeds on a piece of property, as described in Subsection (1), and seeks reimbursement from the property owner of record or the person in possession of the property, the county shall send the property owner or person in possession of the property a documented description of the expense and a demand for payment within 30 days of the day on which the weed control took place. (b) The property owner of record or the person in possession of the property, as the case may be, shall reimburse the county for the county's expense within 90 days after receipt of the demand for payment, as described in Subsection (2)(a). (c) If the demand for payment is not paid within 90 days after receipt, the charges become a lien against the property and are collectible by the county treasurer at the time general property taxes are collected.