S.C. Code Ann. § 41-43-180

The authority must maintain a list of the most economically distressed areas of the State. Each area must be within or coexistent with the boundaries of one of the forty-six counties. The list must be determined in accordance with criteria set forth in the regulations of the authority. In formulating criteria, the authority must consider, but not be limited to, the following factors: rate of unemployment, per capita income, average wage rate, and chronic nature of economic problems.