Hawaii (HI) Plumbing Code & Permit Rules
Uniform Plumbing Code (2018)
Data: State plumbing boards, ICC, IAPMO, EPA
Our reference data lists several plumbing requirements for Hawaii; confirm details with your local building department. Our regulation records list a licensed plumber for most work, annual backflow testing, and seismic strapping for water heaters; requirements vary by location and installation. Homeowners should budget for professional plumbing services and compliance costs.
Plumbing Code
Hawaii follows the Uniform Plumbing Code (2018 edition).
Key Regulations
| Regulation | Status | Details |
|---|---|---|
| Plumbing Code | UPC (2018) | Uniform Plumbing Code |
| Homeowner DIY | Not allowed | Licensed plumber required |
| Water Heater Permit | Required | |
| Backflow Testing | Annual, required | |
| Seismic Strapping | Required | Water heater restraint |
DIY Plumbing in Hawaii
Hawaii requires a licensed plumber for most plumbing work. Licensed plumber required
While this increases costs, it ensures:
- Work meets current code requirements
- Proper permitting and inspection
- Warranty and liability protection
- Safe connections to water and sewer systems
Backflow Prevention
Hawaii requires annual backflow testing to protect the public water supply from contamination. Testing must be performed by a Certified tester.
Non-compliance penalty: Water service may be shut off if testing is not completed on schedule.
Water Conservation Requirements
Hawaii follows federal water conservation standards. Federal minimums apply
Lead Service Line Replacement
Hawaii is subject to EPA lead service line inventory and replacement requirements.
Data Sources
- Hawaii state plumbing board and licensing agency
- International Code Council (ICC)
- IAPMO
- EPA Safe Drinking Water Act
Updated as regulations change.
Need a licensed plumber in Hawaii?
Plumbing regulations vary by city. Connect with a licensed professional who knows your local code requirements.
Find a Licensed Plumber →Frequently Asked Questions
What plumbing code does Hawaii follow?
Hawaii follows the Uniform Plumbing Code (2018 edition) as of our last review; state and local amendments may apply.
Can I do my own plumbing work in Hawaii?
Our reference data lists Hawaii as requiring a licensed plumber for most plumbing work; homeowner exemptions may apply, so check state and local permit rules.
Do I need a permit to replace a water heater in Hawaii?
Permit rules for water heater replacement in Hawaii depend on the state and your local jurisdiction; check with your local building department. Check whether state and local rules require a licensed plumber for the installation.
Is backflow testing required in Hawaii?
Backflow testing requirements in Hawaii depend on the state code and your water utility; check with your utility about which assemblies must be tested and how often.
Does Hawaii require seismic strapping for water heaters?
Our reference data lists a seismic strapping requirement for water heaters in Hawaii; confirm it with your local building department. This typically involves two metal straps securing the water heater to the wall to prevent toppling during an earthquake.