Montana Title 37. Professions and Occupations § 37-69-301. License required

(1) Except as provided in 37-69-102, a person working at the field of plumbing in this state, either as a master plumber or as a journeyman plumber, shall first obtain a license as provided in Title 37, chapter 69, part 3.

(2) A person who receives a license under the provisions of this chapter shall carry the license, or proof of licensure, at all times while working on a job site and performing work that requires a license. Acceptable proof of licensure must be determined by the board and made known by the department to each licensee when a license is issued.