Idaho (ID) Plumbing Code & Permit Rules
Uniform Plumbing Code (2018) · Updated 2026-05-31
Data: State plumbing boards, ICC, IAPMO, EPA Last verified: 2026-05-31
Idaho allows homeowner DIY plumbing with permits, though annual backflow testing is still required. This balanced approach gives homeowners flexibility while maintaining water quality standards.
Plumbing Code
Idaho follows the Uniform Plumbing Code (2018 edition).
Key Regulations
| Regulation | Status | Details |
|---|---|---|
| Plumbing Code | UPC (2018) | Uniform Plumbing Code |
| Homeowner DIY | Allowed | Permissive for primary residence |
| Water Heater Permit | Required | Homeowner can do own work |
| Backflow Testing | Annual, required | |
| Seismic Strapping | Not required | Water heater restraint |
DIY Plumbing in Idaho
Idaho allows homeowners to perform plumbing work on their primary residence. A permit is required for most work beyond minor repairs.
Common DIY-allowed projects (with permit):
- Replacing faucets and fixtures
- Installing shut-off valves
- Replacing toilet components
- Minor drain repairs
Projects that typically require a licensed plumber:
- New water line installation
- Sewer line repair or replacement
- Gas line connections
- Backflow preventer installation
Backflow Prevention
Idaho 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
Idaho follows federal water conservation standards. Federal minimums apply
Lead Service Line Replacement
Idaho has an active lead service line replacement program. Following EPA Lead and Copper Rule 2021
Data Sources
- Idaho 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 Idaho?
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 Idaho follow?
Idaho follows the Uniform Plumbing Code (2018 edition).
Can I do my own plumbing work in Idaho?
Yes, homeowners in Idaho can perform plumbing work on their primary residence with proper permits.
Do I need a permit to replace a water heater in Idaho?
Yes, Idaho requires a permit for water heater replacement. Homeowners may be able to do the work themselves with a permit.
Is backflow testing required in Idaho?
Yes, Idaho requires annual backflow testing.
Does Idaho require seismic strapping for water heaters?
No, Idaho does not require seismic strapping for water heaters. However, they remain a prudent option in areas with seismic activity.