S.C. Code Regs. § § 121-8.23
Any water well used in connection with the drilling of an oil or gas well shall be constructed in such a manner that will ensure proper protection from contamination of the fresh water aquifers. Said well shall be grouted to a depth of at least 50 feet or until the first impermeable layer is encountered (where applicable). Upon completion of said well, a complete well construction report and a driller's log, or lithologic log, shall be submitted to the Commission within thirty (30) days and before beginning drilling operations for the oil or gas well. After drilling and/of production operations have ceased, the water well shall be properly plugged or when the well to be plugged may safely be used for a fresh water well, or as an observation well to be maintained by the Commission, a written agreement for such use shall be secured from the landowners, or the Commission and filed with the agency. (NOTE: Any water well drilled in connection with an oil or gas well, which might be used as a drinking water source, may require a permit from the South Carolina Department of Health and Environmental Control as a public supply well).
S.C. Code Regs. § 121-8.23