Plumbing License Requirements in Illinois: A Comprehensive Guide

Whether you’re just starting your plumbing apprenticeship or have been operating as a contractor in Illinois for years, staying compliant with state licensing and certification regulations is non-negotiable. Understanding the Illinois plumbing license system not only ensures you’re operating legally—it also builds trust with your customers, protects your business, and opens doors to better job opportunities.

In this comprehensive guide, we’ll break down everything working plumbers and plumbing contractors need to know about licensing in the state of Illinois. With regulations overseen by the Illinois Department of Public Health (IDPH), maintaining your credentials involves a few clearly defined steps, from apprenticeship to journeyman to contractor. Let’s review those requirements and why they matter—plus, how to get a plumber’s license in Illinois the right way.

Types of Plumbing Licenses in Illinois

The state of Illinois recognizes three main categories of plumbing professionals under IDPH plumber rules: Apprentice Plumber, Licensed Plumber (often called “Journeyman” under previous terminology), and Plumbing Contractor. It’s crucial to understand the scope and limitations of each license type so you can build your career path responsibly.

Apprentice Plumber License

This is your first step into the plumbing profession in Illinois. As an apprentice, you’re allowed to work under the supervision of a licensed plumber or contractor. However, you must register with IDPH annually and participate in an approved apprenticeship program or learn through on-the-job training with a state-licensed contractor.

To apply for an Apprentice License, you must:

• Be at least 16 years old
• Complete the Apprentice Plumber License Application via IDPH
• Be sponsored by a licensed Illinois plumber or plumbing contractor
• Renew your registration annually by May 1st

Licensed Plumber (Journeyman)

Often referred to as journeyman plumbers in other states, Illinois issues this license simply as “Licensed Plumber.” Once eligible, individuals must pass a state licensing exam to earn this credential.

Requirements include:

• Completion of a 4–6 year apprenticeship program registered with the IDPH
• Documentation of at least 1,200 hours of plumbing coursework
• Holding an active apprentice license for at least four years
• Successful completion of the Illinois Plumbing License Exam

Plumbing Contractor License

Holding the highest level of responsibility in Illinois plumbing operations, a Plumbing Contractor License is issued to individuals or entities who manage plumbing businesses. This includes overseeing plumbing installations, managing apprentices or other plumbers, and holding liability insurance and a surety bond.

Plumbing Contractor license requirements:

• Must already be a Licensed Plumber in Illinois
• Submit a Plumbing Contractor Application to the IDPH
• Maintain general liability insurance and a $20,000 surety bond
• Register your business name and address with IDPH
• Renew annually before May 1st

Applying for and Renewing a Plumbing License in Illinois

Understanding the application and renewal process for all license tiers ensures you stay in compliance and avoid costly gaps in your certifications.

Apprentice Plumbing License Process

Application: Download and complete the “Application for an Apprentice Plumber’s License” (IDPH Form).

Sponsorship: Secure a sponsor—either a licensed plumber or plumbing contractor—who will supervise your training.

Submit Documents: Send the application with a check or money order for the fee to the IDPH’s Plumbing Program office.

Deadline: Applications must be submitted before May 1 of each year for renewal.

Licensed Plumber (Journeyman) Process

Complete Apprenticeship: Finish an approved apprenticeship program.

Pass Exam: Register and pass the IDPH Plumber Licensing Examination (Exam Info).

Scope of Work: Once licensed, you may work independently on plumbing systems but cannot hire or supervise other plumbers unless you hold a contractor license.

Renewal: Licensed plumbers must renew annually; a renewal notice will be sent prior to May 1.

Plumbing Contractor License Process

Be a Licensed Plumber: It’s a prerequisite to hold a valid Illinois plumber’s license.

Insurance Requirements: Provide proof of general liability insurance and surety bond coverage.

Business Registration: Apply using your business name and submit a business address.

Fee and Renewal: Like the other credentials, this license must be renewed every year by May 1.

Required Exams, Training & Continuing Education

Required Training and the Exam Process

The plumber’s license exam in Illinois is rigorous and designed to test both practical and theoretical knowledge of plumbing codes, systems, and safety:

• Exam Format: Includes a combination of written, practical, and design sections
• Preparation: Many apprentices enroll in union or community college training programs to prepare
• Frequency: Exams are offered quarterly; pre-registration is required

The IDPH provides detailed steps to prepare and apply for the Licensing Exam on their Plumbing Program homepage.

Continuing Education Requirements in Illinois

Maintaining your plumbing license doesn’t end with passing the exam. Continuing education for plumbers in IL is mandatory.

Key Points:

• Plumbers must complete a minimum of 4 hours of continuing education each year
• Courses must be approved by the IDPH
• Topics typically include code updates, cross-connection control, construction best practices, and safety
• Submit proof of continuing education with each renewal application

Failing to complete these hours can result in license suspension or denial of renewal.

Penalties for Operating Without a Plumbing License in Illinois

Operating without a proper plumbing license is against Illinois state law and comes with significant consequences.

Consequences Include:

• Fines: IDPH may issue civil penalties up to $5,000 per violation
• Business Shut Down: Local authorities can issue cease and desist orders
• Legal Action: Unlicensed plumbing work is subject to legal prosecution under Illinois law
• Loss of Credibility: Public-facing violations damage professional reputation—potentially for years

Whether you’re doing residential work or managing commercial installations, carrying the proper license is not optional. Check with the IDPH Plumbing Licensing Program to verify your status at any time.

Why Licensing Matters: Protecting Homeowners and Professionals Alike

The plumbing trade is one of the most critical fields in infrastructure and public health—and that’s exactly why licensing is mandatory.

For Contractors:

• Legal Protection: Keeps you compliant and protected from liability
• Job Opportunities: Many building permits and commercial clients require proof of licensing
• Professional Credibility: Shows clients you’re deeply trained, vetted, and up to code

For Homeowners:

• Peace of Mind: Licensed plumbers provide a safeguard for quality workmanship and code compliance
• Health & Safety: Protects homes from water contamination, leaks, and improper piping
• Legal Recourse: Homeowners have better legal standing against licensed contractors in case of disputes

Plumbing licenses are more than just paperwork—they’re a guarantee of safety, trust, and craftsmanship.

Summary: Steps to Get or Renew Your Plumbing License in Illinois

Here’s a quick checklist for plumbing professionals looking to stay compliant with Illinois law:

• ✅ Complete an apprenticeship recognized by IDPH
• ✅ Apply for and maintain your annual Apprentice License
• ✅ Pass the Illinois plumber’s license exam
• ✅ Apply for a Plumbing Contractor License (if starting your own business)
• ✅ Stay up to date with annual license renewals
• ✅ Complete 4 hours of continuing education annually
• ✅ Never operate plumbing jobs without a valid license

If you’re unsure of your next step, contact IDPH or a professional trade organization like the Illinois Plumbing Inspectors Association (IPIA) or the Plumbing Contractors Association of Chicago and Cook County.

Call to Action: Don’t Risk Your License—Get Guidance When You Need It

Whether you’re an apprentice just starting out or a seasoned contractor expanding your business, navigating plumbing certification and licensing in Illinois can be complex. Don’t go it alone.

Reach out to an experienced mentor, trade school, or statewide association to stay on the right path. They can provide resources, networking opportunities, and exam prep to boost your success.

Need help or have questions about regulations? Visit https://dph.illinois.gov/topics-services/environmental-health-protection/plumbing.html or call the IDPH Plumbing Program office at (217) 524-0791.

Final Thoughts

Getting and maintaining your Illinois plumbing license isn’t just a legal requirement—it’s an essential part of being a trusted, skilled, and successful plumbing professional. Licensing protects your future, your business, and your customers.

Whether you’re working residential remodels or installing commercial systems, your credentials tell the world that you care about doing the job right.

Stay licensed. Stay trusted. Grow your reputation the right way.

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