Illinois Plumber License Requirements (2026)

Illinois licenses plumbers statewide through the Illinois Department of Public Health (IDPH). The individual Plumber’s License and the business Plumbing Contractor Registration are separate: an individual qualifies by licensed apprenticeship, approved instruction, and the state examination, while a contractor performing plumbing work for another person must also register annually with IDPH and meet the required insurance conditions. This statewide system does not eliminate local permits, inspections, or local code administration.

Regulatory Body

Under Illinois Plumbing License Law, 225 ILCS 320; Plumbers Licensing Code, 68 Ill. Adm. Code 750; Plumbing Contractor Registration Code, 77 Ill. Adm. Code 894., Illinois Department of Public Health — Plumbing Program (IDPH) is the body that issues this license and enforces compliance with it. IDPH licenses plumbers and apprentice plumbers and registers plumbing contractors statewide under the Illinois Plumbing License Law.

Official portal: https://dph.illinois.gov/topics-services/environmental-health-protection/plumbing.html
Address: 525 W. Jefferson Street, Springfield, IL 62761
Phone: (217) 524-0791

Eligibility Requirements

Applicants must be at least 16 years old. Applicants must provide a Social Security Number. The statewide examination application has separate Illinois/Chicago and out-of-state sections. Use the current IDPH application for the applicable documentation; IDPH’s public requirements do not list an Illinois-residency condition.

Good moral character

Use the current IDPH application and Plumbing License Law. IDPH’s public eligibility materials emphasize the licensed-apprentice, education, examination, and renewal requirements rather than a separate published character standard.

Background investigation

The public IDPH plumbing requirements do not list a separate fingerprint-based background-check step. Provide the information required by the current IDPH application.

Experience and Education

Eligibility requires 4 years of An examination applicant must have been employed as an Illinois licensed apprentice plumber under supervision for at least four years immediately before application. IDPH describes the overall licensed-apprentice period before examination as 48 to 72 months and requires approved course instruction., documented and independently verifiable. Payroll, tax, project, and supervisor records are the usual proof the board will accept.

Accepted proof of experience or eligibility

Current Plumber’s License: Application for Examination
Illinois licensed apprentice license number and documented supervised employment history
Evidence of approved plumbing course instruction
For out-of-state applicants, current license/registration information and the licensing entity’s letter showing the exact period licensed

Education substitution

Applicants need at least two years of high school or equivalent and approved course instruction through a college, university, or trade school. The current IDPH material does not authorize a general education substitution for the four-year licensed-apprentice requirement.

Exam Requirements

Testing provider or authority: Illinois Department of Public Health / Illinois Plumbing Program. The following examination requirements cover the pathways described in this guide; follow each part's classification, waiver, and local-scope conditions. Unpublished format details do not remove an examination requirement:

Illinois Plumber licensing examination — question count: confirm with the authority, timing: confirm with the authority, passing score: confirm in the current candidate bulletin

Examination fee: Use the current IDPH examination application. The published application lists a $175 fee for an Illinois licensed-apprentice applicant and $225 for a plumber registered or licensed in Chicago or outside Illinois.

Retake policy: An applicant who must retake the examination submits IDPH’s Plumber’s Licenses: Examination Retake Form and the applicable fee. Do not rely on unsourced section scores or fixed test schedules.

Insurance and Bonds

This credential carries no state-level surety bond requirement under the cited sources. Individual jobs may still trigger a permit or public-works bond, which should be verified before bidding.

General liability

A registered plumbing contractor must document general liability insurance of at least $100,000 per occurrence and $300,000 aggregate for bodily injury, plus property-damage insurance of at least $50,000 or a $300,000 combined single limit.

Workers' compensation

The Plumbing License Law requires a registered plumbing contractor to document workers’ compensation insurance with at least $500,000 employer’s liability. IDPH also provides an affidavit and opt-out form for the circumstances addressed by its contractor-registration process.

Additional financial requirements

No individual plumber bond or financial-statement requirement is listed in IDPH’s public licensing overview. Use the current contractor-registration application for any business-specific documents.

Fee Schedule

Fee	Amount
Application	$175
Initial license	No separate amount recorded; confirm in the fee guidance
Renewal (every year)	No separate amount recorded; confirm in the fee guidance

To turn these board fees into a realistic year-one budget — bond premium, liability insurance, and exam prep included — open the cost calculator preloaded for Illinois plumber.

Renewal and Continuing Education

Expect to renew the Illinois Licensed Plumber and Plumbing Contractor Registration every year. The cited materials name no distinct statewide fee for renewal. Renew the individual plumber license by April 30 following issuance. Plumbing contractors register annually on a separate path.

Continuing education: IDPH states that licensed plumbers complete continuing-education requirements annually. Use the current IDPH course listing and renewal instructions for the required hours and accepted courses.

Reciprocity

Illinois does not accept the NASCLA Accredited Examination for this classification.

Reciprocal State	Accepted Exam	Conditions
No formal bilateral reciprocity agreements identified.

IDPH provides a distinct examination application path for plumbers registered or licensed in Chicago or outside Illinois. Do not assume an automatic reciprocal license or an exam waiver without current IDPH approval.

Weighing more than one jurisdiction? The national hub compares published Plumber license requirements by state — exam, bond, fee, and experience thresholds side by side.

Plumber Licensing in Neighboring States

Contractors working near a state line, or weighing where to qualify first, should compare Illinois's requirements against the bordering jurisdictions before committing to an application:

Indiana Plumber License Requirements — Indiana Plumbing Contractor (and Journeyman Plumber)
Iowa Plumber License Requirements — Iowa Master Plumber License and Contractor License
Kentucky Plumber License Requirements — Kentucky Master Plumber (and Journeyman Plumber)
Missouri Plumber License Requirements — Missouri Plumber — City and County Licensing
Wisconsin Plumber License Requirements — Wisconsin Master Plumber

Step-by-Step Application Roadmap

Become a licensed apprentice plumber. Apply to IDPH at age 16 or older and provide sponsorship by an Illinois licensed plumber or approved apprenticeship program.
Complete supervised apprenticeship and approved instruction. Work as a licensed apprentice under the required supervision for at least four years and complete the required approved plumbing instruction. IDPH will not renew an apprentice who reaches the six-year maximum without applying for, or passing, the plumber examination.
Prepare the examination application. Submit the Plumber’s License: Application for Examination at least 30 days before the examination date, with the applicable fee, apprentice history, education, and any required out-of-state documentation.
Pass the IDPH licensing examination. Use the current IDPH testing information and the Illinois Plumbing Code. If a retake is needed, use the official retake form and current fee.
Renew the individual license annually. A plumber license renews by April 30 following issuance. Complete the annual continuing-education and child-support-certification requirements in IDPH’s renewal process.
Register the business when contracting. A licensed plumber or apprentice who performs work for another person is a plumbing contractor and must register annually with IDPH, pay the annual fee, and document the required insurance.
Use the license number correctly. Display at least one member’s plumbing license at the business location and include the plumbing license number in all plumbing-service advertisements.
Obtain local permits and inspections. State licensure and contractor registration do not replace permits, inspections, or local plumbing-code administration for a project.

Application Checklist

The most critical documents or confirmations the applicant should have in hand before filing with IDPH:

Illinois licensed apprentice registration and qualifying supervised employment
Approved plumbing instruction and high-school/equivalent documentation
Current IDPH Plumber’s License: Application for Examination and applicable fee
IDPH examination pass and annual individual-license renewal
Annual IDPH plumbing-contractor registration when working for another person
Required contractor insurance documentation
License number displayed at the business and in plumbing-service advertising
Local permits and inspections for each project

Common Filing Mistakes

Drawn from the board instructions and sources cited on this page, the pitfalls below are the ones most likely to slow down or sink a Illinois Plumber application.

Counting unlicensed apprentice work

The IDPH examination path requires employment as an Illinois licensed apprentice under supervision. Register before relying on work time toward the requirement.

Confusing the individual license with contractor registration

The individual Plumber’s License and annual Plumbing Contractor Registration are separate. A contractor must meet the registration and insurance conditions.

Using an out-of-state or Chicago license without IDPH review

IDPH has a separate application path for plumbers registered or licensed in Chicago or outside Illinois. Do not assume automatic reciprocity or an exam waiver.

Forgetting the advertising rule

Illinois requires plumbing-service advertising to include the plumbing license number, and the business must display a member’s license at its place of business.

Study and Reference Materials

These are the preparation and reference materials tied to this credential — cited by the regulator or widely used by applicants. CLR earns nothing from listing them.

Illinois Plumbing Code — Illinois Department of Public Health. Primary statewide technical code reference.
Illinois Plumbing License Law — Illinois General Assembly. Primary authority for licensure, contractor registration, insurance, and advertising rules.
Plumber’s License: Application for Examination — Illinois Department of Public Health. Official current examination eligibility and document checklist.

Other Illinois Trade Licenses

If the Plumber license is not the right fit, the following published Illinois trade guides are also covered by CLR:

Frequently Asked Questions

Does Illinois require a statewide plumbing license?

Yes. IDPH licenses plumbers and apprentice plumbers statewide under the Illinois Plumbing License Law and separately registers plumbing contractors.

How long is the Illinois plumbing apprenticeship requirement?

An examination applicant must have worked as an Illinois licensed apprentice under supervision for at least four years. IDPH describes the licensed-apprentice period before examination as 48 to 72 months and limits the apprenticeship to six years without an exam application or pass.

Do Illinois plumbing contractors register separately?

Yes. A licensed plumber or apprentice who performs plumbing work for another person is a plumbing contractor and must register annually with IDPH and maintain the required insurance.

What insurance does an Illinois plumbing contractor need?

The Plumbing License Law requires specified general-liability, bodily-injury, property-damage, and workers’ compensation coverage. The statutory minimums are $100,000 per-occurrence and $300,000 aggregate bodily injury; $50,000 property damage or $300,000 combined single limit; and $500,000 employer’s liability.

When does an Illinois plumber license renew?

IDPH says plumber licenses renew by April 30 following issuance and annual continuing education is required.

Primary Sources

Regulatory requirements on this page are drawn from the official board, statute, and exam-provider materials listed below.

Verified 2026-09-04 · Next scheduled review 2026-12-03

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Corrections and presentation updates

2026-09-30: Corrected examination detection when format details are unpublished and updated the summary layout and requirements score. Source-check dates are unchanged.
2026-09-08: Shared template updated to distinguish unspecified eligibility requirements, retain cost qualifications, and use consistent headings. Source-check dates are unchanged by presentation updates.
2026-09-21: Local-only guides now use a compliance-focused structure and terminology instead of implying a statewide license application. Source-check dates are unchanged by this presentation update.