S.C. Code Ann. § 6-24-130

If a joint agency undertakes a project requiring financing, in whole or in part, with the proceeds of bonds, and the payment of principal or interest on the bonds is assured directly or indirectly by a contract with one or more members, the project must not be undertaken without the approval of the governing body of each member which provides assurance. For these purposes, a member has not assured payment on bonds unless its obligation pursuant to the contract is absolute and without regard to the completion or operation of the project.