Utah Code § 10-20-503
§ 10-20-503. Land use ordinance or zoning map amendments.
(1) Only a legislative body may amend: (a) the number, shape, boundaries, area, or general uses of any zoning district; (b) any regulation of or within the zoning district; or (c) any other provision of a land use regulation. (2) A legislative body may not make any amendment authorized by this section unless the legislative body first submits the amendment to the planning commission for the planning commission's recommendation. (3) A legislative body shall comply with the procedure specified in Section 10-20-502 in preparing and adopting an amendment to a land use regulation.