S.C. Code Ann. § 47-20-110 – Monitoring wells

(A) All animal feeding operations established after the effective date of this chapter which require the use of a lagoon and a waste storage pond and which have a capacity for more than 420,000 pounds of normal production animal live weight at any one time are required to install at least one up-gradient and two down-gradient monitoring wells at a depth which the department considers appropriate around the lagoon in order to monitor seepage of waste from the lagoon.
(B) Each monitoring well installed must be analyzed at least once annually. However, the department may conduct routine and random visits to the animal feeding operation to sample the monitoring wells.
(C) Records must be kept by the owner or operator of the animal feeding operation according to regulations promulgated by the department.
(D) If leakage is discovered beyond an acceptable level as determined by the department, the lagoon must be repaired at the owner or operator's expense.