S.D. Codified Laws § 49-31-57

The commission may on its own motion or upon the motion of any party, assess against a party reasonable attorney fees, expert witness fees, discovery costs, transcript fees or other expenses of the commission or another party to a proceeding if a party has filed a pleading with the commission that is interposed for an improper purpose, such as to harass, cause unnecessary delay or needlessly increase the cost of litigation. Any sanction imposed by the commission shall be pursuant to and consistent with § 15-6-11.