Utah Code Ann. § 17B-1-502
(1)
(2)
(a) An area within the boundaries of a local district is automatically withdrawn from the local district by the annexation of the area to a municipality or the adding of the area to a municipality by boundary adjustment under Title 10, Chapter 2, Part 4, Annexation, if:
(i) the local district provides:
(3)
(a) An area within the boundaries of a local district located in a county of the first class is automatically withdrawn from the local district by the incorporation of a municipality whose boundaries include the area if:
(i) the local district provides:
(iii) the legislative body of the newly incorporated municipality: