S.D. Codified Laws § 27B-7-32.2
Upon receipt of the request to reopen the commitment hearing, the county review board shall, as soon as practicable, afford the county determined to be the person's county of residence an opportunity to appear before the board, at a time and place set by the board and not more than thirty days from the date of the request to reopen the hearing. Notice of the reopened hearing shall be given to the county where the person was found and to the county requesting the reopening of the hearing at least ten days prior to the reopened hearing by mailing notice thereof to the respective county auditors. Either county appearing at the reopened hearing may present any evidence it may have to establish that it is not the county of residence of the person. The board shall then determine, by a preponderance of evidence, the county of residence of the person and either affirm or modify its prior finding. The ultimate finding of residence shall be filed with the clerk of courts of the committing county and the county of residence with copies mailed to the administrator of the center or other facility where the person is undergoing treatment.
SDCL 27B-7-32.2