S.D. Codified Laws § 49-34B-7
Any person who engages in the intrastate transportation of gas or who owns or operates intrastate gas pipeline facilities shall establish, maintain, and provide such records, reports, and information as the commission may require to determine whether the person has complied with the provisions of this chapter and the standards established under this chapter. Any such person shall, upon request of an employee or agent authorized by the commission, permit the employee or agent to inspect facilities, books, papers, records, and documents relevant to determining whether the person has complied with this chapter and the standards established pursuant to this chapter. Any employee or agent of the commission, upon presenting appropriate credentials to the individual in charge, may enter upon and inspect gas pipeline facilities at reasonable times and in a reasonable manner.
SDCL 49-34B-7