S.C. Code § 5-7-60
Any municipality may perform any of its functions, furnish any of its services, except services of police officers, and make charges therefor and may participate in the financing thereof in areas outside the corporate limits of such municipality by contract with any individual, corporation, state or political subdivision or agency thereof or with the United States Government or any agency thereof, subject always to the general law and Constitution of this State regarding such matters, except within a designated service area for all such services of another municipality or political subdivision, including water and sewer authorities, and in the case of electric service, except within a service area assigned by the Public Service Commission pursuant to Article 5 of Chapter 27 of Title 58 or areas in which the South Carolina Public Service Authority may provide electric service pursuant to statute. For the purposes of this section designated service area shall mean an area in which the particular service is being provided or is budgeted or funds have been applied for as certified by the governing body thereof. Provided, however, the limitation as to service areas of other municipalities or political subdivisions shall not apply when permission for such municipal operations is approved by the governing body of the other municipality or political subdivision concerned.
S.C. Code § 5-7-60