Nothing in KRS 211.972 to 211.982 shall be construed to require a business license for:
(1) A property owner to clean his own sewage pretreatment unit, grease trap, or holding tank.
(2) A municipality servicing and maintaining a public sewage treatment facility.
(3) A master plumber, duly qualified and licensed under the laws of the State of Kentucky, except that vehicles which are used as defined in KRS 211.972 to 211.982 shall be licensed as provided.