S.C. Code Ann. § 11-37-80

The authority may pledge any of its revenue or funds to the payment of its bonds, subject only to any prior agreements with the holders of particular bonds which may have pledged specific money or revenue. Bonds may be secured by a pledge of any local obligation owned by the authority, any grant, contribution, or guaranty from the United States, the State, or any corporation, association, institution, or person, any other property or assets of the authority, or a pledge of any money, income, or revenue of the authority from any source.