S.C. Code Regs. § ch. 61, 61-56, 61-56.400, app 61-56.400.S
(1) The permitting of nonwater-carried sewage treatment systems, such as a biological, composting, or incinerating toilet, may be considered for toilet wastes when a proposed site is unsuitable for the issuance of an onsite wastewater system permit under the system standards in Appendices A through R. Nonwater-carried sewage treatment systems shall be designed, installed, maintained, and operated without endangering public health, the environment, or creating a nuisance.
(2) With the application for a permit to construct, all applicants seeking to install a nonwater-carried sewage treatment system must submit to the Department plans from a Registered Professional Engineer licensed in South Carolina that describe the design and installation of the proposed nonwater-carried sewage treatment system and demonstrate the following:
(a) The system complies with all local codes and ordinances.
(b) All products and processes meet applicable National Sanitation Foundation (NSF) Standards and American National Standards Institute (ANSI) Standard 41 and bear the seal of approval of the NSF or an equivalent testing and certification program.
(c) Compartment and appurtenances are insect and vector-proof and have continuous exterior ventilation.
(d) There will be no liquid wastewater produced by the system.
(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.
(3) Applicants seeking to install a nonwater-carried sewage treatment system at a site where water under pressure will be connected to the structure and gray water is generated (from showers, sinks, etc.), but where nonwater-carried sewage treatment systems will be the only means for toilet waste disposal, must:
(a) Submit plans from a Registered Professional Engineer licensed in South Carolina that meet the requirements of Appendix S, paragraphs (2)(a) through (f), for all toilet wastes; and
(b) Apply for and obtain a Department permit to construct and approval to operate an onsite wastewater system for treatment of gray water. This system must meet all permit, licensing, and onsite wastewater system requirements under this regulation, except that the initial system size may be reduced by twenty-five (25) percent.
(4) A licensed installer is not required for the installation of a nonwater-carried sewage treatment 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.S