S.C. Code Ann. § 4-23-1045

The district commission, upon agreement with another fire department or district not located in the service area of the district, may permit the other department or district to provide fire services in certain parts of the district if this is considered to be a more cost-effective solution to the provision of fire services in that particular location, and alternatively also may agree to provide fire services in parts of Florence or Darlington counties outside the service area of the district if this is considered to be a more cost-effective solution to the provision of fire services in that particular location.