Wyo. Stat. Ann. § 16-3-106

Any interested person may petition an agency requesting the promulgation, amendment or repeal of any rule and may accompany his petition with relevant data, views and arguments. Each agency may prescribe by rule the form of the petition and the procedure for its submission, consideration and disposition. Upon submission of a petition, the agency as soon as practicable either shall deny the petition in writing (stating its reasons for the denials) or initiate rulemaking proceedings in accordance with W.S. 16-3-103. The action of the agency in denying a petition is final and not subject to review.