How do you get an Illinois plumber license (IDPH Plumbing Program)?
Illinois also structures its ladder differently from most states. Rather than a journeyman tier and a master tier, Illinois registers apprentice plumbers and issues a single Licensed Plumber credential, with a separate plumbing contractor registration for businesses. Illinois enforces its own Illinois Plumbing Code rather than adopting the IPC or UPC outright, and Chicago operates its own plumbing code and inspection regime on top. The route is the familiar one: register as an apprentice so your hours count, accrue supervised experience under a licensed plumber, pass the IDPH Plumbing Program examination on the plumbing code Illinois enforces, and then build the additional experience the higher tier requires. Hours, fees, examination content and renewal requirements are set by the Illinois Department of Public Health, Division of Plumbing and Water Quality and revised periodically, so verify the current requirements with the IDPH Plumbing Program before you apply.
- Register as an apprentice with the IDPH Plumbing Program so your supervised hours count from day one.
- Accrue supervised experience under a licensed plumber, with related classroom instruction.
- Apply to the IDPH Plumbing Program and pass the examination on the plumbing code Illinois enforces.
- Build the additional experience the next tier requires, then sit that examination.
- Add the business licence, bond and insurance if you intend to contract work to the public.
Governing law: Illinois Plumbing License Law (225 ILCS 320)
Illinois plumber license at a glance
This guide is general information about Illinois licensing, not legal advice. IDPH Plumbing Programrules, fees and deadlines change — confirm your own position with the board, or with a licensed attorney, before you rely on anything here.
Illinois plumber license types: the full IDPH Plumbing Program ladder
The ladder in Illinois runs apprentice, journey-level, master, with a separate business credential for contracting to the public. Illinois also structures its ladder differently from most states. Rather than a journeyman tier and a master tier, Illinois registers apprentice plumbers and issues a single Licensed Plumber credential, with a separate plumbing contractor registration for businesses. Illinois enforces its own Illinois Plumbing Code rather than adopting the IPC or UPC outright, and Chicago operates its own plumbing code and inspection regime on top.
Registered apprentice
Registered with the IDPH Plumbing Program and working under the supervision of a licensed plumber while accruing hours. No examination, and the point at which most Illinois plumbers should start the paperwork — unregistered hours frequently do not count.
Restricted or limited credentials
Illinois issues narrower credentials authorising defined work short of a full licence. They are a legitimate route into independent work, but read the scope carefully: they authorise less than a journeyman licence, not the same work with a different name.
Journey-level plumber
The core individual licence: work independently on most plumbing installations after the required supervised experience and the IDPH Plumbing Program code examination. This is what employers hire on in Illinois.
Master plumber
The senior individual tier: design systems, supervise journeymen, and in most jurisdictions pull permits. Requires holding the journey-level licence for the period Illinois sets, plus a harder examination.
Plumbing contractor / business credential
A business credential rather than a personal one, required to contract plumbing work to the public. Normally needs a qualifying individual, liability insurance and a bond. IDPH publishes licensed plumber and registered plumbing contractor verification, and Chicago maintains its own records for work inside the city.
Backflow prevention assembly tester
A separate certification to test and certify backflow prevention assemblies, with its own training, examination and periodic recertification, often administered through water utilities or an approved certifying body rather than the plumbing board.
Medical gas and specialty endorsements
Endorsements for medical gas and vacuum piping in healthcare facilities, brazing qualification under NFPA 99 and ASSE 6010, and other defined specialist work. They sit on top of the plumbing credential rather than replacing it.
Exact experience hours and fees vary by license type and can change, confirm current requirements on the IDPH Plumbing Program Plumber program page.
Illinois journey-level vs Illinois master Plumber in Illinois, what is the difference?
How do you get an Illinois journey-level Plumber license?
- 1
Register with the IDPH Plumbing Program before you start logging hours
Illinois counts supervised experience, but it counts it on the Illinois Department of Public Health, Division of Plumbing and Water Quality's terms. Register as an apprentice at the outset, work under a licensed plumber in the supervision arrangement the rules require, and keep your own record of hours and employers alongside whatever your employer files. Plumbers who accrue years of good experience without registration are the ones who discover the problem at application time, when reconstructing the paperwork is hardest.
- 2
Build verifiable supervised experience
Plumbing licensing everywhere rests on time under supervision, and Illinois is no exception. Registered apprenticeship through a UA local or a state-approved programme is the cleanest route, because it produces classroom instruction and documented hours in a form the IDPH Plumbing Program recognises, and it is paid throughout. Whatever route you take, the test at the end is whether someone with direct knowledge of your work can verify it, so keep employer records, pay records and job descriptions.
- 3
Prepare for the code examination the IDPH Plumbing Program uses
The examination is built on the plumbing code Illinois enforces, with state and sometimes local amendments layered on top, and it covers water supply and distribution, drain, waste and vent systems, sizing and venting, isometrics, gas piping where the credential includes it, backflow prevention and safety. It never covers the electrical code. Illinois also structures its ladder differently from most states. Rather than a journeyman tier and a master tier, Illinois registers apprentice plumbers and issues a single Licensed Plumber credential, with a separate plumbing contractor registration for businesses. Illinois enforces its own Illinois Plumbing Code rather than adopting the IPC or UPC outright, and Chicago operates its own plumbing code and inspection regime on top. Confirm the current adopted code and edition with the IDPH Plumbing Program before buying a code book, because an out-of-date edition is a common and avoidable reason to fail.
- 4
Apply, sit the examination and receive the credential
File the application with the Illinois Department of Public Health, Division of Plumbing and Water Quality, with your verified experience, identification and the current fee, and sit the examination once you are approved. Fees, application review times and examination scheduling are set by the IDPH Plumbing Program and by whichever testing vendor it contracts, and both change — take the current figures from the board rather than from a third-party summary. IDPH publishes licensed plumber and registered plumbing contractor verification, and Chicago maintains its own records for work inside the city.
- 5
Move up the ladder, then add the business credential if you contract
The journey-level licence is not the end of the ladder. Illinois sets an additional period of journey-level experience before the master examination, and the master tier is what carries design, supervision and, in most jurisdictions, permit-pulling authority. Contracting plumbing work to the public is a further step again, requiring the business credential with liability insurance and a bond. Renew everything on the IDPH Plumbing Program's cycle and complete any continuing education it requires — a lapsed licence stops work immediately and reinstatement takes longer than renewal.
Does an Illinois plumber license transfer to other states?
Plumbing reciprocity is real but narrow. Where Illinois has arrangements, they typically apply to a specific licence class held actively and in good standing for a defined period in a state whose requirements the Illinois Department of Public Health, Division of Plumbing and Water Quality considers substantially equivalent, and they usually waive the trade examination rather than the whole application — expect the business or law portion, the fee, the experience verification and any state-specific requirements to remain. The states covered and the classes covered change, and an arrangement that existed when a colleague moved may not exist now. Confirm the current position with the IDPH Plumbing Program before relying on an out-of-state licence, and do not let the original licence lapse in the meantime, because it is usually the basis the application rests on.
Reciprocity agreements change, always confirm the current list and requirements on the IDPH Plumbing Program Plumber program page before applying.
How much does an Illinois plumber license cost, and how long does it take?
The apprenticeship is the real investment and it is paid, so most Illinois plumbers reach licensure without tuition debt. The fees to budget for are the application and examination fees charged by the Illinois Department of Public Health, Division of Plumbing and Water Quality and whichever testing vendor it contracts, the code book for the current adopted edition, and renewal with any continuing education. A business contracting to the public adds liability insurance and a bond, priced as an annual premium rather than the face amount. Every one of these is set separately and revised periodically, so take current figures from the IDPH Plumbing Program's published fee schedule rather than from a third-party total.
Illinois plumbing exam content and license verification
What does the Illinois exam cover, and how do you check a licence?
There is no national plumbing examination. Illinois tests you on the plumbing code it enforces, with state amendments, covering water supply and distribution, drain, waste and vent systems, fixture and pipe sizing, venting, drainage isometrics, gas piping where the credential covers it, backflow prevention and safety. Illinois also structures its ladder differently from most states. Rather than a journeyman tier and a master tier, Illinois registers apprentice plumbers and issues a single Licensed Plumber credential, with a separate plumbing contractor registration for businesses. Illinois enforces its own Illinois Plumbing Code rather than adopting the IPC or UPC outright, and Chicago operates its own plumbing code and inspection regime on top. Boards contract testing to vendors such as PSI, Prometric or ICC or administer examinations themselves, and whether the examination is open book with an approved code book — as many plumbing examinations are — is set by the IDPH Plumbing Program rather than nationally. Confirm the current adopted code edition, the testing vendor and the passing standard with the Illinois Department of Public Health, Division of Plumbing and Water Quality before scheduling, because all three are revised periodically and an out-of-date code book is a common cause of an avoidable failure.
How to verify an Illinois plumber license
IDPH publishes licensed plumber and registered plumbing contractor verification, and Chicago maintains its own records for work inside the city. Check the credential type rather than merely that one exists: in plumbing the difference between an individual licence, a business credential and a specialty endorsement determines what the holder may lawfully do, and a customer or general contractor checking only that "he's licensed" learns very little. Confirm the status and expiry too, and where a business is contracting the work, confirm its liability insurance and bond as well as its licence. GlobalCybers verifies every candidate's credentials before they reach your portal.
How do you get a plumbing license in Illinois?
Illinois licenses plumbers statewide, and it does so through an unexpected agency: the Illinois Department of Public Health, not a labour department or a contractor board. The Illinois Plumbing License Law places plumbing under public health because it is treated first as a matter of potable water and sanitation.
Register as an apprentice with the IDPH Plumbing Program so your supervised hours count, accrue the experience the board requires under a licensed plumber with the related classroom instruction, then apply and pass the examination on the plumbing code Illinois enforces. The master tier follows after further journey-level experience. Verify the current requirements with the Illinois Department of Public Health, Division of Plumbing and Water Quality before committing time or money.
Does Illinois have a journeyman plumber license?
Yes. Illinois licenses individual plumbers at journey level through the Illinois Department of Public Health, Division of Plumbing and Water Quality, and it is the credential employers hire on here. It sits above registered apprentice and below master, and it authorises independent work on most plumbing installations.
Illinois also structures its ladder differently from most states. Rather than a journeyman tier and a master tier, Illinois registers apprentice plumbers and issues a single Licensed Plumber credential, with a separate plumbing contractor registration for businesses. Illinois enforces its own Illinois Plumbing Code rather than adopting the IPC or UPC outright, and Chicago operates its own plumbing code and inspection regime on top.
Illinois Plumber licenses, Frequently Asked Questions
Illinois Department of Public Health, Division of Plumbing and Water Quality · IAPMO, Uniform Plumbing Code · International Code Council, International Plumbing Code · U.S. Department of Labor, Registered Apprenticeship · U.S. Bureau of Labor Statistics, OEWS May 2025 (47-2152). Fees and rules can change, confirm current details at dph.illinois.gov/topics-services/environmental-health-protection/plumbing.html before applying.
IDPH Plumbing Program credentialed? Find a job.
We verify your IDPH Plumbing Program credential and match you with permanent employers in Illinois. Renewal fees paid after placement.
Find Illinois Plumber Jobs →Your career research journey
Do your homework, then let the network do the rest.Get the job, then keep rising
FreeSet your intent, matching jobs come to you. No applying.
A roadmap to your next licence tier and higher pay band.
Once placed, we cover all certification, licence & career-guide fees.
Related · Plumber
Everything for plumbers in one place
Salary data, licensing, interview prep, and hiring, all cross-linked so you (and search engines) can move through the full plumber cluster.