Plumber License Requirements in Montana

Montana regulates plumbers through the Board of Plumbers. The journeyman license page requires a registered apprenticeship completion certificate, five years of legally obtained experience verified by an active licensed master plumber or plumbing contractor, and a passing score of 70 percent or better on written and practical examinations; the board also maintains separate master plumber licensing materials. Verified against Montana Board of Plumbers licensing pages on 2026-03-09.