IC 25-28.5-1-2 Definitions
Sec. 2. As used in this chapter: (1) "Plumbing" means the practice of and the materials and fixtures used in the installation, maintenance, extension, and alteration of all piping, fixtures, appliances, and appurtenances in connection with any of the following: (A) Sanitary drainage or storm drainage facilities, the venting system, and the public or private water supply