State plumbing guide · ID
Plumbing in Idaho
Idaho adopts a state plumbing code based on the Uniform Plumbing Code and licenses plumbers through the Division of Occupational and Professional Licenses. Cold winters and fast growth around Boise shape local work.
- Median home built
- 1993
- Built before 1980
- 36%
- Owner-occupied
- 72%
- Winter
- Regular hard freezes
- General statewide rating
- Plumbing code
- UPC
- City guides
- 0
Housing figures: U.S. Census Bureau, ACS 2024 1-year (B25035, B25034).
How to check a plumber's license in Idaho
Idaho's Division of Occupational and Professional Licenses licenses plumbing journeymen and contractors through the State Plumbing Board. [1]
Which plumbing code applies in Idaho
The Idaho State Plumbing Code is based on the Uniform Plumbing Code and adopted with amendments by the Idaho Plumbing Board. [2]
Seasonal problems to plan for in Idaho
- Winter
- Hard freezes: protect exposed pipes, disconnect hoses. Frozen pipes.
- Summer
- Irrigation season exposes hidden leaks and backflow problems.
How old Idaho's homes are
Statewide, the median home was built in 1993 and 36% 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.
Idaho plumbing questions
How do I check a plumber's license in Idaho?
Verify the plumber and contractor license with Idaho DOPL's license lookup.
Which plumbing code applies in Idaho?
The Idaho State Plumbing Code, based on the Uniform Plumbing Code with amendments by the Idaho Plumbing Board.
Sources (3)
- U.S. Census Bureau, ACS 2024 1-year (B25035, B25034) · checked 2026-10-01
- Idaho DOPL, State Plumbing Board · checked 2026-10-01
- Idaho DOPL, State Plumbing Board · checked 2026-10-01