S.C. Code Ann. § 4-9-40

Any county may perform any of its functions, furnish any of its services within the corporate limits of any municipality, situated within the county, by contract with any individual, corporation or municipal governing body, subject always to the general law and the Constitution of this State regarding such matters. Provided, however, that where such service is being provided by the municipality or has been budgeted or funds have been applied for that such service may not be rendered without the permission of the municipal governing body.