Utah Code § 17-79-1005: Burden of proof.

In an appeal described in this part:

(1) if the appellant is a land use applicant, the appellant has the burden of proving that the land use authority's land use decision is illegal or is not supported by substantial evidence; or

(2) if the appellant is an adversely affected party, the appellant has the burden of proving that the land use authority's land use decision is illegal, or that the factual findings are clearly erroneous.