Michigan (MI) Plumbing Code & Permit Rules
International Plumbing Code (2021) · Updated 2026-05-31
Data: State plumbing boards, ICC, IAPMO, EPA Last verified: 2026-05-31
Michigan 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
Michigan follows the International Plumbing Code (2021 edition).
Key Regulations
| Regulation | Status | Details |
|---|---|---|
| Plumbing Code | IPC (2021) | International Plumbing Code |
| Homeowner DIY | Allowed | Homeowner exemption for primary residence |
| Water Heater Permit | Required | Homeowner can obtain permit for own home |
| Backflow Testing | Annual, required | |
| Seismic Strapping | Not required | Water heater restraint |
DIY Plumbing in Michigan
Michigan 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
Michigan 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
Michigan follows federal water conservation standards. Federal minimums apply
Lead Service Line Replacement
Michigan has an active lead service line replacement program. Aggressive replacement mandate (Flint legacy); 5-year replacement requirement
Data Sources
- Michigan 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 Michigan?
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 Michigan follow?
Michigan follows the International Plumbing Code (2021 edition).
Can I do my own plumbing work in Michigan?
Yes, homeowners in Michigan can perform plumbing work on their primary residence with proper permits.
Do I need a permit to replace a water heater in Michigan?
Yes, Michigan requires a permit for water heater replacement. Homeowners may be able to do the work themselves with a permit.
Is backflow testing required in Michigan?
Yes, Michigan requires annual backflow testing.
Does Michigan require seismic strapping for water heaters?
No, Michigan does not require seismic strapping for water heaters. However, they remain a prudent option in areas with seismic activity.