State plumbing guide · MT
Plumbing in Montana
Montana uses the Uniform Plumbing Code statewide and licenses plumbers through a state board in the Department of Labor and Industry. Deep frost and long winters shape every job.
- Median home built
- 1983
- Built before 1980
- 47%
- Owner-occupied
- 69%
- Winter
- Long, hard freezes
- General statewide rating
- Plumbing code
- UPC
- City guides
- 1
Housing figures: U.S. Census Bureau, ACS 2024 1-year (B25035, B25034).
Montana city plumbing guides
How to check a plumber's license in Montana
The Montana Board of Plumbers, in the Department of Labor and Industry, licenses journeyman and master plumbers. [1]
Seasonal problems to plan for in Montana
- Winter
- Hard freezes: protect exposed pipes, disconnect hoses. Frozen pipes.
- Summer
- Irrigation season exposes hidden leaks and backflow problems.
Which plumbing code applies in Montana
Montana adopts the 2021 Uniform Plumbing Code by reference in ARM 24.301.301, with Montana amendments, effective June 11, 2022. [2]
How old Montana's homes are
Statewide, the median home was built in 1983 and 47% of homes predate 1980. Homes like that were usually built with copper or CPVC supply, plastic drains, and in some homes gray polybutylene supply pipe. The city guides below show how much that varies within the state.
Montana plumbing questions
How do I check a plumber's license in Montana?
Verify the license with the Montana Board of Plumbers' license lookup.
Which plumbing code applies in Montana?
The 2021 Uniform Plumbing Code with Montana amendments, adopted in ARM 24.301.301.
Sources (3)
- U.S. Census Bureau, ACS 2024 1-year (B25035, B25034) · checked 2026-10-01
- Montana Board of Plumbers · checked 2026-10-01
- IAPMO, Montana 2021 UPC amendments (ARM 24.301.301) · checked 2026-10-01