No person shall test an individual subsurface sewage disposal system in a manner that will adversely affect the functioning of the system. Hydraulic loading shall not be applied in excess of the design flow capacity of the septic tank and/or grease trap unless all solids have been removed from the septic tank and/or grease trap prior to testing or unless the hydraulic loading is applied at a point that will bypass the septic tank and/or grease trap. All testing of operating systems which requires a hydraulic loading which is in excess of the design flow shall be performed under the supervision of a licensed professional engineer.
N.J. Admin. Code § 7:9A-12.7