Utah Code Ann. § 17D-2-602 – Contesting the legality of a resolution or other proceeding -- No cause of action after contest period.

(1) For a period of 30 days after publication of a resolution or other proceeding under Subsection 17D-2-601(1) or a notice under Subsection 17D-2-601(2), any person in interest may file an action in district court contesting the regularity, formality, or legality of:
1. (a) a resolution or other proceeding;
2. (b) any bonds or a lease agreement authorized by a resolution or other proceeding; or
3. (c) any provision made for the security or payment of local building authority bonds or lease agreement.
(2) After the period referred to in Subsection (1), no one may have a cause of action to contest for any reason the regularity, formality, or legality of any of the matters listed in Subsection (1).