S.C. Code Ann. § 44-59-50
(A) The Catawba/Wateree Commission shall be composed of fifteen members who reside in counties which abut the Catawba/Wateree River Basin as follows:
(B) The Yadkin/Pee Dee Commission shall be composed of fifteen members who reside in counties which abut the Yadkin/Pee Dee River Basin as follows: