"Septage", for purposes of this chapter and IC 13-18-12, means the following:
(1) The following from sewage disposal systems:(A) Human excreta.(B) Water.(C) Scum.(D) Sludge.(E) Sewage.(F) Incidental or accidental seepage.(2) Retained contents of sewage holding tanks and portable sanitary units.(3) Grease, fats, and retained wastes from grease traps or interceptors.(4) Human wastes carried in liquid from ordinary living processes.