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Key Facts: IL Plumber Exam
75% average (min 61 each section)
Passing Score
Illinois Department of Public Health (IDPH)
100
Questions
Varies by section limit
$175
Exam Fee
State-administered
IPC
Code Base
Illinois adoption
Illinois's journeyman plumber exam is based on the Illinois State Plumbing Code (SPC) and administered by IDPH. It uses a unique 3-part format: written knowledge test, drawing interpretation, and practical demonstration. The Illinois SPC is distinct from both the IPC and UPC. The exam requires a 75% average with a minimum 61% on each section.
Sample IL Plumber Practice Questions
Try these sample questions to review concepts for the IL Plumber exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 298+ question experience with AI tutoring.
1Under the IPC as adopted by Illinois, what is the minimum size of a building sewer?
2Per the IPC as adopted by Illinois, what is the minimum slope for a 4-inch horizontal drainage pipe?
3What is the DFU value for a residential water closet (1.6 gpf) under the IPC?
4Per the IPC as adopted by Illinois, what is the maximum distance between cleanouts on a horizontal drainage pipe?
5Under Illinois regulations, what type of backflow preventer is required for a high-hazard cross-connection?
6Per the IPC as adopted by Illinois, what is the minimum water supply pipe size for a bathtub with shower?
7What is the maximum water temperature setting for a residential water heater per the IPC?
8Per the IPC as adopted by Illinois, what is the minimum trap seal depth for a standard plumbing fixture?
9Under the IPC as adopted by Illinois, what is the minimum vent pipe size?
10Per the IPC as adopted by Illinois, what is the maximum static water pressure in a building distribution system?
About the IL Plumber Exam
Illinois journeyman plumber exam is state-administered by IDPH. Unique 3-part format: written knowledge, drawing interpretation, and practical skills. Based on the Illinois State Plumbing Code (SPC). Requires 75% average with minimum 61% on each section.
Exam sponsor: Illinois Department of Public Health (IDPH). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.
Questions
100 questions
Time Limit
Varies by section
Passing Score
75% average (min 61 each section)
Reported exam pass rate: ~50-60%. This describes exam candidates, not OpenExamPrep users or results from using our resources. Exam sponsor website
Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.
Our practice resources: topics covered
We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.
Drainage & Waste Systems
Drain sizing, DFU calculations, slope requirements, cleanouts per SPC
Water Supply & Distribution
Pipe sizing, backflow prevention, water heaters, pressure regulation per SPC
Venting Systems
Vent sizing, wet venting, AAVs, vent termination, circuit venting per SPC
Gas Piping
Gas pipe sizing, appliance venting, pressure testing, BTU calculations per IFGC
Fixtures, Materials & Illinois Code
Fixture installation, materials, joints, permits, inspections, and Illinois-specific requirements
Preparing for the IL Plumber Exam
What You Need to Know
- Passing score: 75% average (min 61 each section)
- Exam length: 100 questions
- Time limit: Varies by section
- Exam / certification fees: $175 Official sources
Using Our Practice Resources
- Work through all 298 available questions
- Review every answer and explanation
- Track weak areas and revisit them
- Use our AI tutor for tough concepts
IL Plumber: Suggested Study Strategy
Frequently Asked Questions
What code does Illinois use for the plumber exam?
Illinois uses the Illinois Plumbing Code (SPC). The exam covers drainage, venting, water supply, gas piping, and fixture requirements as adopted by the state.
Who administers the Illinois plumber exam?
The exam is administered by State-administered under the Illinois Department of Public Health (IDPH).
How many questions are on the Illinois plumber exam?
The Illinois plumber exam has approximately 100 questions with a Varies by section time limit. A score of 75% average (min 61 each section) is required to pass.
Is the IL plumber exam open book?
Most State-administered-administered plumber exams allow a bound copy of the adopted code. Check with the Illinois Department of Public Health (IDPH) for approved reference materials.