Plumbing may be defined as practice, materials, and fixtures used in the installation, maintenance, and alteration of all piping, fixtures, appliances, and appurtenances in connection with sanitary or storm drainage facilities, the venting system, and the public or private water supply systems. Plumbing does not include the trade of drilling water wells, installing water softening equipment, or the business of manufacturing or selling plumbing fixtures, appliances, equipment, or hardware. A plumbing system consists of three separate parts: an adequate potable water supply system, a safe, adequate drainage system and ample fixtures and equipment.
The generalized inspection of a home is concerned with a safe water supply system, an adequate drainage system, and ample and proper fixtures and equipment. This explains features of a residential plumbing system and the basic plumbing terms the inspector must know and understand to identify properly housing code violations involving plumbing and the more complicated defects that he will refer to the appropriate agencies.