S.D. Codified Laws § 58-25-10
Any filing made pursuant to §§ 58-25-7 to 58-25-9, inclusive, shall be approved by the director, unless he finds that such filing does not meet the requirements of this chapter or shall otherwise be contrary to law. As soon as reasonably possible after the filing has been made, the director shall, in writing, approve or disapprove the same; provided, however, that, if such filing has not been disapproved by the director within fifteen days from the date of filing, or within thirty days if such period be extended in writing by the director during the first fifteen days, it shall be deemed approved, and the rates, contracts, or other subject matter of such filing may be put into effect by the insurer at the expiration of such waiting period. In the event the director disapproves any filing, he shall specify in what respect he finds that such filing does not meet the requirements of this chapter or is otherwise contrary to law.
SDCL 58-25-10