Illinois plumbing license: Complete 2026 Guide

Official-source review: August 26, 2026

Illinois plumbing license: Illinois licenses plumbers, apprentice plumbers and plumbing contractors through the Department of Public Health. The ordinary plumber route begins with a sponsored apprentice license and culminates in the state examination after the required apprenticeship and education.

Fast answer: Register as an apprentice under an Illinois-licensed plumber or approved program, complete at least four years of licensed apprenticeship and the required school instruction, file the examination application at least 30 days before testing, pass the state exam and register the plumbing contracting business before offering covered work.

Illinois plumbing license authority education experience exams fees insurance renewal — Illinois requirements summarized from the responsible agencies. Local permits, employers and certifying bodies may impose additional conditions.

What the Illinois plumbing license covers

Illinois licenses plumbers, apprentice plumbers and plumbing contractors through the Department of Public Health. The ordinary plumber route begins with a sponsored apprentice license and culminates in the state examination after the required apprenticeship and education.

Planning, installation, alteration, repair and maintenance of plumbing systems statewide.
Work only within the issued credential scope.
Obtain all local permits and inspections.

Backflow work follows the Illinois CCCDI route.

Illinois plumbing license requirements at a glance

Requirement	Current rule or route
Route	IDPH licensed apprentice, plumber and registered plumbing contractor routes
Eligibility	At least four years as an Illinois licensed apprentice plumber, with the approved education described by IDPH.
Exam	Illinois plumber licensing examination after IDPH confirms eligibility.
Fees	State application, examination and annual license charges apply; verify the current IDPH forms before filing. Local permits are additional.
Bond or insurance	Plumbing contractors satisfy state registration and local business-insurance requirements.
Renewal	Plumber licenses expire April 30 following issuance and renew annually.

Do not treat this table as an approval notice. The agency, certification organization or local jurisdiction makes the final eligibility decision and may request additional evidence.

How to complete the Illinois plumbing license process

Identify the exact state and local credential required.
Complete the published education and experience.
Pass each required examination.
Submit applications, identity records and fees.
Complete business, insurance and employment filings.
Obtain project permits and renew on time.

Keep copies of every experience certificate, examination result, bond or insurance filing and payment receipt. Names and business entities should match across the application and supporting documents.

Important Illinois rules and boundaries

The apprentice license does not authorize unsupervised plumbing.
The individual plumber license and plumbing contractor registration are separate.
Local permits and inspections remain required.
Backflow testing requires additional CCCDI approval.

Illinois may separate the credential held by a worker from the contractor license held by the business, while preserving local authority over permits and inspections. Confirm every applicable layer before bidding, advertising or beginning regulated work.

Illinois plumbing license cost and renewal

Budget separately for education, examinations, state and local licenses, insurance and project permits.

Renew each state and local credential separately and verify current charges before filing.

Government charges are only part of the expected cost. Training, examination preparation, fingerprints, surety premiums, insurance, equipment calibration and local permits can add to the total.

Illinois plumbing license checklist

Confirm that this credential matches the exact work you will perform.
Check whether the applicant is an individual, sole owner or separate business entity.
Collect experience and training records before submitting the application.
Use the current official form and fee schedule.
Complete every required examination or approved certification route.
File bonds, insurance and fingerprints when applicable.
Check county, city, water supplier and building-permit rules.
Save the expiration date and renewal requirements.

Frequently asked questions

Is this credential statewide?

It depends on the occupation. Illinois licenses several trades statewide and leaves others to local governments.

Is an exam required?

Illinois plumber licensing examination after IDPH confirms eligibility.

When does it renew?

Plumber licenses expire April 30 following issuance and renew annually.

Are local approvals separate?

Yes.

Official sources used

Verified licensing details

Jurisdiction: state license or local credential, depending on the occupation and project
Licensing authority: Illinois Department of Public Health Plumbing Program
Fees: State application, examination and annual license charges apply; verify the current IDPH forms before filing. Local permits are additional.
Experience: At least four years as an Illinois licensed apprentice plumber, with the approved education described by IDPH.
Exams: Illinois plumber licensing examination after IDPH confirms eligibility.
Insurance or bond: Plumbing contractors satisfy state registration and local business-insurance requirements.
Continuing education: Licensed plumbers complete the annual continuing education required by Illinois law.
Renewal period: Plumber licenses expire April 30 following issuance and renew annually.

Official sources

Official sources last checked August 25, 2026.

Requirements can change and local rules may apply. Confirm the current requirements with the official authority before paying a fee or beginning work.