Yes, Illinois licenses plumbers, and it does it at the state level. To get a plumbing license in Illinois you go through the Illinois Department of Public Health (IDPH), which administers the Illinois Plumbing License Law statewide.
Who runs plumbing licensing in Illinois
The Illinois Department of Public Health handles plumber licensing, apprentice registration, exams, and renewals. One quirk: Chicago coordinates its own plumber exam process with the state, and exam fees differ for Chicago applicants. If you plan to work in the city, check with both IDPH and the City of Chicago before applying.
License types
- Apprentice Plumber: the entry license. You must be at least 16, have completed at least 2 years of high school, and work under a licensed plumber who sponsors you.
- Licensed Plumber: the full license. Lets you plan, install, alter, and repair plumbing systems anywhere in Illinois.
The path to a full license
- 1. Register as an apprentice with IDPH and work under a licensed plumber.
- 2. Put in the time. The standard route is a minimum of 4 years as a licensed apprentice with at least 1,400 hours each year. Alternate route: 2 years as a licensed apprentice plus 2 years of approved plumbing course instruction through a college, university, or trade school.
- 3. Apply for the exam at least 30 days before the exam date. Fees have run $175 for in-state applicants and $225 for Chicago and out-of-state applicants.
- 4. Pass the exam. It covers plumbing system planning and design, practical skills, and the Illinois Plumbing Code. IDPH requires a 75 percent average with at least 61 percent in each section.
- 5. Keep it current. Licensed plumbers complete 4 hours of continuing education each year to renew.
Reciprocity
Illinois does not advertise broad reciprocity. Out-of-state plumbers should expect to sit the Illinois exam. Confirm your specific situation with IDPH.
How to apply
Applications, exam dates, and current fees are on the IDPH plumbing program page.
FAQ
How long does it take to become a licensed plumber in Illinois?
Plan on about 4 years as an apprentice (or 2 years of work plus 2 years of approved coursework) before you can sit the exam.
Can I start a plumbing business once I pass?
The license covers the trade work. The business side, an LLC, insurance, pricing, and contracts, is separate. Our guide on how to start a plumbing business walks through it.
Where can I compare other states?
See the full plumbing license by state index, or start with the plumbing license overview.
Requirements change. Always confirm current rules, fees, and forms with the board before you apply. This page is a guide, not legal advice.
