S.C. Code Ann. § 6-11-1810

Any municipality, fire district, fire protection agency, or other emergency service entity may provide mutual aid assistance, upon request, from any other municipality, fire district, fire protection agency, or other emergency service delivery system in South Carolina at the time of a significant incident such as fire, earthquake, hurricane, flood, tornado, hazardous material event, or other such disaster. The chief or highest ranking officer, with the approval and consent of the governing body, may provide this assistance while acting in accordance with the policies, ordinances, and procedures set forth by the governing body of the providing governmental entity.