Utah Code Ann. § 17C-1-504 – Contesting the legality of resolution authorizing bonds -- Time limit -- Presumption.

(1) Any person may contest the legality of the resolution authorizing issuance of the bonds or any provisions for the security and payment of the bonds for a period of 30 days after:
1. (a) publication of the resolution authorizing the bonds; or
2. (b) publication of a notice of bonds containing substantially the items required under Subsection 11-14-316(2).
(2) After the 30-day period under Subsection (1), no lawsuit or other proceeding may be brought contesting the regularity, formality, or legality of the bonds for any reason.
(3) In a lawsuit or other proceeding involving the question of whether a bond issued under this part is valid or enforceable or involving the security for a bond, if a bond recites that the agency issued the bond in connection with an urban renewal, economic development, or community development project:
1. (a) the bond shall be conclusively presumed to have been issued for that purpose; and
2. (b) the project area plan and project area shall be conclusively presumed to have been properly formed, adopted, planned, located, and carried out in accordance with this title.