Ind. Code § 25-28.5-1-2
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:
(B) The practice and materials used in the installation, maintenance, extension, or alteration of the stormwater, liquid waste, or sewerage, and water supply systems of any premises to the private property line or to their connection with any point of public disposal or other acceptable terminal.
The term does not include the planning, designing, and installation of sanitation and water systems in vehicles commonly known as mobile homes, the drilling of wells, the installation of pumps, pressure tanks, and piping incidental to the drilling or repair of a well system, the sale or installation of water softening equipment and apparatuses and services of the same, or the business of manufacturing or selling plumbing fixtures; appliances, equipment, or hardware; the installation of automatic sprinklers, the overhead or underground water supplies or standpipes when connected to an automatic sprinkler system or to their related devices or appurtenances connecting thereto; nor does the term include the work referred to in section 32(i) of this chapter; nor does the term include the planning or design of water supply or sewage systems which would ordinarily be performed as "the practice of engineering", as defined in IC 25-31-1 , or the "practice of architecture", as defined in IC 25-4-1 .
(11) "Apprentice plumber" means an individual who:
(12) "Registration" means the granting of a certificate by the commission that authorizes an individual to act as an apprentice plumber.
Formerly: Acts 1972, P.L.188, SEC.1. As amended by Acts 1981, P.L.222, SEC.202; P.L.132-1984, SEC.36; P.L.248-1985, SEC.1; P.L.1-2006, SEC.469.