Utah Code § 17-78-1103
§ 17-78-1103. Regulation of carbon monoxide detectors -- Enforcement against occupant only.
(1) Subject to Subsection (2), a county may not enforce an ordinance, rule, or regulation requiring the installation or maintenance of a carbon monoxide detector in a residential dwelling against anyone other than the occupant of the dwelling. (2) Subsection (1) may not be construed to affect: (a) a building permit applicant's obligation to comply with a building code that requires the installation of a carbon monoxide detector as part of new construction; or (b) a county's ability to require a building permit applicant to comply with a building code that requires the installation of a carbon monoxide detector as part of new construction.