Wyo. Stat. § 24-10-108
When the commission determines that a false or misleading statement has been made in the application for a permit or that the structure for which a permit was issued is not in a reasonable state of repair, is unsafe or in poor repair or otherwise in violation of this act, the commission shall notify the holder of the permit in writing, either by certified mail or by personal service, of the violation and specify that remedial action shall be taken within thirty (30) days or the permit will be revoked and action for removal of the sign commenced as provided in W.S. 24-10-109. No notice is required prior to filing a complaint after the notice period has lapsed. The provisions of this section apply to all signs in existence prior to the effective date of this act.
W.S. 24-10-108