S.D. Codified Laws § 34-48A-26
The Governor, the secretary, and the executive officers or governing bodies of the political subdivisions of the state shall utilize the services, equipment, supplies, and facilities of existing departments, offices, and agencies of the state and of the political subdivisions thereof to the maximum extent practicable, and the officers and personnel of all such departments, offices, and agencies. Such departments, offices, and agencies shall cooperate with and extend such services and facilities to the Governor, the secretary and to the emergency management organizations of the state upon request. A local political subdivision must exhaust its available resources prior to obtaining assistance from another political subdivision. The state must exhaust all available governmental resources prior to obtaining private resources.
SDCL 34-48A-26