Mont. Code Ann. § 37-69-303

A person, firm, or corporation desiring to engage in or work in the field of plumbing in this state, either as a master plumber or as a journeyman plumber, shall make application to the department by filing a written application stating the applicant's place of residence, age, and experience and the place where the applicant has acquired experience and must at a time and place designated by the board be examined as to the qualifications for a license.