S.C. Code Ann. § 5-37-80: Assessments upon property owners.

The financing of improvements by assessments, bonds, or other revenues, and the proportions thereof, shall be in the discretion of the governing body; and the rates of assessments upon property owners within the improvement district need not be uniform but may vary in proportion to improvements made immediately adjacent to or abutting upon the property of each owner therein, as well as other bases as provided in Section 5-37-20.