S.C. Code Ann. Regs. 103-722 – Meter Accuracy and Condition.

A. Installation Test—Every water meter, whether new or repaired, shall be in good order and shall be correct to within three (3) per cent. However, a utility which has less than one thousand customers and which has no facilities for opening meter cases and adjusting the mechanism, may put a meter back into service if it is not found to be in error by more than three and one-half (3 ¹⁄₂ ) per cent and appears otherwise to be in good order.
B. Method of Testing—All tests to determine the accuracy of registration of any water service meter shall be made with a suitable meter prover, and records of all regular or complaint tests shall be kept by the utility.
No meter shall be installed which is mechanically defective. The capacity of the meter and the index mechanism should be consistent with the water requirements of the customer.