S.D. Codified Laws § 9-35-6 (2026)
Unless otherwise specifically provided, no franchise shall be granted for a longer period than twenty years.
Source: SL 1890, ch 37 , art V, § 1, subdiv 24; RPolC 1903, § 1229, subdiv 24; SL 1903, ch 221 ; SL 1907, ch 92 , § 1; SL 1913, ch 119 , § 53, subdiv 24; SL 1913, ch 119 , § 123; RC 1919, § 6248; SL 1921, ch 310 ; SDC 1939, § 45.1006.