S.C. Code Regs. § ch. 61, 61-56, 61-56.400, app 61-56.400.U
(1) With the application for a permit to construct, all applicants seeking to install a gray water subsurface reuse system must submit to the Department for approval plans from a Registered Professional Engineer licensed in South Carolina that describe the design and installation of the proposed gray water subsurface reuse system and demonstrate the following:
(a) The system complies with all local codes and ordinances.
(b) The system must be of adequate size to handle the wastewater volume and peak flow generated by the structure.
(c) Compartment and appurtenances are insect and vector-proof and have continuous exterior ventilation.
(d) All gray water produced by the structure must be sent to the gray water subsurface reuse system or to a separate onsite wastewater system for treatment and disposal of domestic wastewater. Liquid wastewater must not be held in a storage system to be pumped and hauled.
(e) Methods for training the owner/operator in the proper use, function, and maintenance of the system including safe handling and disposal methods for any residue generated by the system.
(f) All manufacturer recommendations for installation, operation, and maintenance will be followed.
(2) This regulation does not apply to or permit the reuse of gray water for any purpose, or by any means, other than subsurface irrigation. This regulation also does not apply to or permit any reuse or recirculation of gray water within the confines of (i.e., via the plumbing within) a dwelling unit, building, business, or other structure.
(3) A property owner proposing to install a gray water subsurface reuse system for the reuse and disposal of gray water shall ensure that there is also an approved method of treatment and disposal for all other domestic wastewater and sewage generated by the structure. An onsite wastewater system for the treatment and disposal of all other domestic wastewater and sewage generated by the structure shall meet all requirements of this regulation, including standard sizing requirements.
(4) A licensed installer is not required for the installation of a gray water subsurface reuse system under this standard. However, engineering certifications using the applicable Department form must be submitted to the Department before the Department will issue an approval to operate a system under this standard.
S.C. Code Regs. ch. 61, 61-56, 61-56.400, app 61-56.400.U