State plumbing guide · HI
Plumbing in Hawaii
Hawaii licenses journey worker and master plumbers through its Board of Electricians and Plumbers and adopts a state plumbing code based on the Uniform Plumbing Code, which counties adopt with local amendments.
- Median home built
- 1981
- Built before 1980
- 49%
- Owner-occupied
- 62%
- Winter
- Hard freezes are rare
- General statewide rating
- Plumbing code
- UPC
- City guides
- 1
Housing figures: U.S. Census Bureau, ACS 2024 1-year (B25035, B25034).
Hawaii city plumbing guides
How to check a plumber's license in Hawaii
Hawaii's Board of Electricians and Plumbers (DCCA Professional and Vocational Licensing) licenses journey worker and master plumbers. [1]
Which plumbing code applies in Hawaii
The Hawaii State Plumbing Code, adopted by the State Building Code Council, is based on the Uniform Plumbing Code with modifications; counties such as Honolulu adopt it locally. [2]
Seasonal problems to plan for in Hawaii
- Hurricane season
- Know your main shutoff; watch for backups after storms.
- Summer
- Irrigation season exposes hidden leaks and backflow problems.
How old Hawaii's homes are
Statewide, the median home was built in 1981 and 49% 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.
Hawaii plumbing questions
How do I check a plumber's license in Hawaii?
Check the plumber on Hawaii DCCA's Professional and Vocational Licensing search.
Which plumbing code applies in Hawaii?
The Hawaii State Plumbing Code, based on the Uniform Plumbing Code, as adopted by your county.
Sources (3)
- U.S. Census Bureau, ACS 2024 1-year (B25035, B25034) · checked 2026-10-01
- Hawaii DCCA, Requirements for Examination and License: Electricians & Plumbers · checked 2026-10-01
- City and County of Honolulu, §19-1.1 Adoption of the Hawaii State Plumbing Code · checked 2026-10-01