Plumbing is the practice, materials, and fixtures used in mstalling, maintaining, and altering of pipes, appliances, and appurtenances, utilized for potable water supply, sanitary or storm drainage and venting systems. Plumbing does not include the drilling of water wells,installing water softening equipment, or sale of the manufacture or plumbing fixtures appllances, equipment Or hardware Plumbing systems consist of an adequate potable water supply system, a safe adequate drainage system and ample fixtures and equipment