As used in this chapter:

(1)  “Plumbing” means:

(i)  All fittings, fixtures, appliances, and connections that are located within a building or a structure, or within five feet (5?) of the outer walls of a building or structure and that connect said building or structure, where a person or persons live, work, or assemble, with the source of public or private water supply used or intended for domestic or personal use, as well as any interconnecting piping between buildings or structures;

(ii)  All piping, fittings, fixtures, and appliances for a sanitary drainage and related ventilation system, direct or indirect, within that building; and

(iii)  Air piping, medical, and laboratory gas systems including, but not limited to, oxygen and nitrous oxide.

(2)  “Source of private water supply” means the water connection located at the mean water level.

(3)  “Source of public water supply” means any water connection located within five feet (5?) of the outer walls of or within a building or structure, including any interconnecting piping between buildings or structures.