SDCL § 11-7-13: Tenure of commissioners--Certificate of appointment.

Commissioners shall hold office until their successors have been appointed and qualified. A certificate of appointment of each commissioner shall be filed with the clerk. Whenever the membership of a commission is changed by reason of a new appointment, a certificate of that appointment shall be promptly so filed. A certificate so filed shall be conclusive evidence of appointment or change in membership. Commissioners are likewise referred to in this chapter as "members" of a commission.