If you’re a plumbing contractor or aspiring plumber in Illinois, understanding the state’s licensing and certification
process is critical. Whether you’re just starting as an apprentice or operating your own plumbing business, staying compliant with Illinois plumbing license requirements is not only a legal necessity — it’s also essential for building a trusted and successful career.
In this comprehensive guide, we outline the requirements for each type of plumbing license in Illinois, including application processes, exams, continuing education, and the consequences
of working without proper licensure. Use this as your go-to resource to navigate the plumbing certification journey in the Prairie State.
The Three Levels of Illinois Plumbing Licenses
In the State of Illinois, all plumbers must be registered or licensed through the Illinois Department of Public Health (IDPH). The state offers three main classifications:
1. Plumbing Apprentice
This is the entry-level position for individuals who are learning the trade under the supervision of a licensed plumber.
2. Licensed Plumber (Journeyman Equivalent)
After completing apprenticeship training and passing the licensing exam, individuals can become licensed plumbers in Illinois. This is sometimes referred to informally as the journeyman level.
3. Plumbing Contractor
This license allows an individual to operate as an independent plumbing contractor, own a plumbing business, and contract services directly with customers.
How to Get a Plumber’s License in Illinois (Step-by-Step)
Becoming a licensed plumber in Illinois is a multi-step process. Each level comes with specific criteria, and it’s vital to follow state regulations as outlined by the IDPH. Here’s a breakdown of what’s required at each stage:
Plumbing Apprentice Requirements
- Be at least 16 years old
- Complete a plumbing apprentice application through the IDPH
- Work under the supervision of a licensed plumber or contractor
- Submit a $100 non-refundable registration fee
- Register annually with the IDPH
Note: Apprentices must renew their registration every year and can remain an apprentice for up to six years.
Licensed Plumber Requirements (Journeyman Level)
- Completion of at least four years of supervised work under a licensed plumber
- Successful completion of a state-approved apprenticeship program
- Application to IDPH to take the plumber licensing examination
- Submission of a $175 non-refundable exam fee
- Passing score on the Illinois Plumbing License Exam
- Application for initial licensure following exam success
Plumbing Contractor Certification IL Requirements
- Hold a valid Illinois Plumber’s License (Journeyman equivalent)
- Obtain a Federal Employer Identification Number (EIN)
- Secure a Certificate of Insurance with required liability and workers’ compensation coverage
- Register your plumbing business name with the Illinois Secretary of State (if applicable)
- Submit a Plumbing Contractor Application through the IDPH
- Pay a $150 application fee
Illinois Plumbing License Renewal and Continuing Education
Licenses aren’t permanent — keeping your credential current is just as important as getting it.
Annual Renewal
- Plumbing Licenses and Contractor Licenses must be renewed annually.
- Renewal notices are typically sent by the IDPH in the spring.
- Plumbers must renew by May 1 every year to avoid lapse or penalties.
Continuing Education for Plumbers IL
To renew your plumbing license in Illinois, you must:
- Complete 4 hours of approved continuing education each year.
- Choose a provider approved by the IDPH.
- Submit proof of CE hours with the renewal application.
Approved continuing education programs may cover topics like code updates, safety procedures, emerging technology, and environmental concerns.
Plumbing Licensing Exams and Training in Illinois
The Illinois Plumbing License Exam is administered by the IDPH and consists of both written and practical portions. The exam tests knowledge in areas such as:
- Illinois Plumbing Code
- Cross-connection control
- Wastewater systems
- Venting, drainage, and supply piping
- Math and physics relevant to plumbing systems
You can prepare by completing a union or non-union apprenticeship training program, many of which include classroom instruction and hands-on experience.
Penalties for Operating Without a Plumbing License in Illinois
Unlicensed plumbing work is not only dangerous, it’s illegal in the state of Illinois. Operating as a plumber or plumbing contractor without proper licensure can lead to:
- Fines ranging from $500 to over $5,000 per offense
- Cease-and-desist orders
- Civil penalties and possible criminal charges
- Ineligibility for future licensing
- Loss of business reputation
The Illinois Department of Public Health strictly enforces its rules under the Illinois Plumbing License Law (225 ILCS 320).
To avoid these costly and career-threatening consequences, always ensure your work is covered under a valid license.
Why Licensing Matters: Protecting Contractors and Homeowners
Licensing isn’t just a regulatory burden — it’s a key pillar of trust and safety in the plumbing trade.
Benefits for Plumbing Contractors
- Legitimizes your business and boosts credibility
- Opens the door to higher-paying projects and government contracts
- Reduces liability by proving adherence to safety and code standards
- Demonstrates your commitment to ongoing education and quality work
Protection for Homeowners
- Ensures that plumbing work is done safely and up to code
- Offers recourse in case of faulty workmanship
- Prevents health risks from poor sanitation or water contamination
- Deters unqualified or dishonest service providers
A licensed plumber protects both ends of the pipe — so to speak.
Quick Checklist of Requirements for Illinois Plumbers
Here’s a quick glance at the essential steps to becoming and staying licensed as a plumber in Illinois:
- ✅ Apprentice Registration with IDPH (Annual renewal required)
- ✅ Completion of at least 4 years in an apprenticeship program
- ✅ Pass the Illinois Plumbing License Exam
- ✅ Apply for plumber licensure through IDPH
- ✅ Maintain 4 hours of continuing education annually
- ✅ Renew license each year before May 1
- ✅ Apply for a Plumbing Contractor License if running your own business
- ✅ Secure proper insurance and register company name (if applicable)
- ✅ Never operate without valid licensure
Helpful Resources for Illinois Plumbing Professionals
For more information and official documents, visit these trusted sources:
- Illinois Department of Public Health – Plumbing Program
- IDPH Licensing Forms and Applications
- Illinois Plumbing License Law (225 ILCS 320)
Final Thoughts: Stay Certified, Stay Competitive
The plumbing industry in Illinois offers strong career pathways for professionals — but the foundation is proper licensure. Whether you’re just starting as an apprentice or expanding your contractor business, staying compliant with IDPH plumber rules ensures your success.
Don’t wait until there’s a problem. Set reminders for license renewal, complete your continuing education hours, and reach out for mentorship when needed.
Need help finding a state-approved training program, study resources, or association contacts?
👉 Call us at (555) 123-4567 or connect with us on social media:
- Facebook: @IllinoisPlumbingPros
- Twitter: @ILPlumbersGuild
- LinkedIn: Illinois Plumbing Network
We’re committed to helping plumbers like you stay compliant, competitive, and confident in your work.
Stay licensed. Stay trusted. Grow your reputation the right way.