S.C. Code § 49-23-40
This chapter applies to all of the water resources in streams, lakes, and potable drinking water supplies and water levels in the above and below ground water tables of the State, but this chapter does not authorize any restriction in use of water during an incipient, moderate, and severe drought declaration injected into aquifer storage and recovery facilities, water stored in managed watershed impoundments or water from any pond completely situated on private property and fed only by diffused surface water. During a drought declaration, the use of water from a managed watershed impoundment shall not be restricted as long as minimum streamflow or flow equal to the 7Q10 is maintained, whichever is less. For the purposes of this chapter, the waters of the State shall include all groundwater and all surface water within the State as defined in Section 49-23-20. The drought response plan applies to every person using water in this State.
S.C. Code § 49-23-40