Utah Code § 11-25-13: Challenge of program, plan, or area -- Limitation.

Any action challenging the legality of a comprehensive residential rehabilitation financing program, the selection of a residential rehabilitation area, or the adoption of a plan for public improvements for a residential rehabilitation area shall be commenced within 30 days of the publication of the resolution, ordinance, or other proceedings adopting the program or plan, or selecting the area. After this time no one shall have any cause of action to contest the regularity, formality or legality thereof for any cause whatsoever.