S.C. Code Ann. § 6-1-320
(B) Notwithstanding the limitation upon millage rate increases contained in subsection (A), the millage rate limitation may be suspended and the millage rate may be increased upon a two-thirds vote of the membership of the local governing body for the following purposes:
(5) compliance with a regulation promulgated or statute enacted by the federal or state government after the ratification date of this section for which an appropriation or a method for obtaining an appropriation is not provided by the federal or state government.
If a tax is levied to pay for items (1) through (5) above, then the amount of tax for each taxpayer must be listed on the tax statement as a separate surcharge, for each aforementioned applicable item, and not be included with a general millage increase. Each separate surcharge must have an explanation of the reason for the surcharge. The surcharge must be continued only for the years necessary to pay for the deficiency, for the catastrophic event, or for compliance with the court order or decree.