Illinois (IL) Plumbing Code & Permit Rules
Illinois Plumbing Code (2014)
Data: State plumbing boards, ICC, IAPMO, EPA
Our reference data lists Illinois as requiring licensed plumbers for most plumbing work; testing of backflow prevention assemblies may be required under state or local rules. These regulations help protect water quality but mean higher costs for homeowners compared to states that allow DIY work.
Plumbing Code
Illinois follows the Illinois Plumbing Code (2014 edition).
Key Regulations
| Regulation | Status | Details |
|---|---|---|
| Plumbing Code | State-specific (2014) | Illinois Plumbing Code |
| Homeowner DIY | Not allowed | Licensed plumber generally required; check state and local rules for homeowner exemptions |
| Water Heater Permit | Required | Licensed plumber generally required; check state and local rules for homeowner exemptions |
| Backflow Testing | Annual, required | Statewide mandate; covers irrigation and commercial |
| Seismic Strapping | Not required | Water heater restraint |
DIY Plumbing in Illinois
Illinois requires a licensed plumber for most plumbing work. Licensed plumber generally required; check state and local rules for homeowner exemptions
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
Illinois requires annual backflow testing to protect the public water supply from contamination. Testing must be performed by a Licensed plumber.
Non-compliance penalty: Water service may be shut off if testing is not completed on schedule.
Water Conservation Requirements
Illinois follows federal water conservation standards. Federal minimums apply
Lead Service Line Replacement
Illinois is subject to EPA lead service line inventory and replacement requirements. Lead service line replacement program (Chicago); check current program details with your utility
Data Sources
- Illinois 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 Illinois?
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 Illinois follow?
Illinois follows the Illinois Plumbing Code (2014 edition) as of our last review; state and local amendments may apply.
Can I do my own plumbing work in Illinois?
Our reference data lists Illinois 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 Illinois?
Permit rules for water heater replacement in Illinois 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 Illinois?
Backflow testing requirements in Illinois depend on the state code and your water utility; check with your utility about which assemblies must be tested and how often.
Does Illinois require seismic strapping for water heaters?
We have no statewide seismic strapping requirement for water heaters on record for Illinois; local building codes may still require it, so check with your local building department. Strapping remains a prudent option in areas with seismic activity.