If there is a written agreement and if any part of the deposit is to be made non-refundable, it must be so stated in writing to the renter at the time the deposit is taken by the owner or designated agent.
Utah Code § 57-17-2
Non-refundable deposit -- Written notice required
Enacted by Chapter 74, 1981 General Session
Official source: Utah State Legislature. Reproduced from public-domain Utah statutes; confirm against the official source for the current text. Not legal advice.