(a) After January 1, 1974, no person or private sewage disposal system contractor may construct, install, modify, repair, maintain, or service a private sewage disposal system or transport and dispose of waste removed therefrom, in such a manner that does not comply with the requirements of this Act and the private sewage disposal code promulgated hereunder by the Department. A person who owns and occupies a single family dwelling and who constructs, installs, maintains, services or cleans the private sewage disposal system which serves his single family residence shall not be required to be licensed under this Act, however, such person shall comply with all other provisions of this Act and the private sewage disposal code promulgated hereunder by the Department. Any person who constructs, installs, repairs, modifies, or maintains a private sewage disposal system, other than a system which serves his own single family residence, shall be licensed by the Department as a Private Sewage System Installation Contractor and any person who cleans or pumps waste from a private sewage disposal system, other than a system which serves his own single family residence, or hauls or disposes of wastes removed therefrom shall be licensed by the Department as a Private Sewage Disposal System Pumping Contractor in accordance with this Act.