S.D. Codified Laws § 27A-11A-25
A person may appeal a final order of a county board of mental illness pursuant to any hearing or review conducted under this title. In the case of a minor, or a person for whom the guardian has been appointed, such right to appeal may be exercised on behalf of the person by an attorney. The person shall be advised of this right upon the termination of any proceedings, both verbally and in writing. The appeal shall be conducted in accordance with the provisions of chapter 1-26.
None of the rights granted in this section may be denied due to a person's inability to pay for costs and fees incurred in such proceedings. The board of county commissioners of the county where an indigent person has residence shall provide for the cost of representation of the person through the conclusion of actions brought under this section.
SDCL 27A-11A-25