Ind. Code § 25-28.5-1-1

Sec. 1. It is hereby declared to be the policy of the State of Indiana that, in order to safeguard the life, health, and public welfare of its citizens, the business of plumbing construction and improvements is a matter affecting the public interest, and any person engaging in the business as herein defined should be required to establish his competency and qualifications to be licensed as herein provided.