As used in this chapter:
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.
IC 25-28.5-1-2