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100+ Free ID Plumber Practice Questions

Pass your Idaho Journeyman Plumber License Exam exam on the first try — instant access, no signup required.

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2026 Statistics

Key Facts: ID Plumber Exam

70%

Passing Score

Idaho Division of Occupational and Professional Licenses (DOPL)

100

Questions

3 hours limit

~$195

Exam Fee

PSI (IAPMO exam)

IPC

Code Base

Idaho adoption

Idaho's journeyman plumber exam is based on the IPC (Idaho State Plumbing Code) and administered by PSI (IAPMO exam). Idaho uses the IAPMO-developed exam. The Idaho State Plumbing Code is based on the IPC with state-specific amendments for cold climate and rural water systems. The exam requires 70% to pass and tests drainage, water supply, venting, gas piping, and fixture knowledge.

About the ID Plumber Exam

Idaho journeyman plumber exam uses the IAPMO exam administered by PSI under DOPL. Based on the Idaho State Plumbing Code (IPC with amendments). Tests drainage, water supply, venting, gas piping, and Idaho-specific code provisions.

Questions

100 scored questions

Time Limit

3 hours

Passing Score

70%

Exam Fee

~$195 (Idaho Division of Occupational and Professional Licenses (DOPL))

ID Plumber Exam Content Outline

25%

Drainage & Waste Systems

Drain sizing, DFU calculations, slope requirements, cleanouts per IPC

20%

Water Supply & Distribution

Pipe sizing, backflow prevention, water heaters, pressure regulation per IPC

20%

Venting Systems

Vent sizing, wet venting, AAVs, vent termination, circuit venting per IPC

15%

Gas Piping

Gas pipe sizing, appliance venting, pressure testing, BTU calculations per IFGC

20%

Fixtures, Materials & Idaho Code

Fixture installation, materials, joints, permits, inspections, and Idaho-specific requirements

How to Pass the ID Plumber Exam

What You Need to Know

  • Passing score: 70%
  • Exam length: 100 questions
  • Time limit: 3 hours
  • Exam fee: ~$195

Keys to Passing

  • Complete 500+ practice questions
  • Score 80%+ consistently before scheduling
  • Focus on highest-weighted sections
  • Use our AI tutor for tough concepts

ID Plumber Study Tips from Top Performers

1Master IPC drainage fixture unit (DFU) values and pipe sizing tables
2Study backflow prevention device selection and cross-connection control
3Memorize minimum pipe sizes, slopes, and clearances for common fixtures
4Practice gas pipe sizing calculations using IFGC tables
5Understand wet venting and circuit venting provisions in the IPC
6Learn Idaho-specific permit and inspection requirements

Frequently Asked Questions

What code does Idaho use for the plumber exam?

Idaho uses the IPC (Idaho State Plumbing Code). The exam covers drainage, venting, water supply, gas piping, and fixture requirements as adopted by the state.

Who administers the Idaho plumber exam?

The exam is administered by PSI (IAPMO exam) under the Idaho Division of Occupational and Professional Licenses (DOPL).

How many questions are on the Idaho plumber exam?

The Idaho plumber exam has approximately 100 questions with a 3 hours time limit. A score of 70% is required to pass.

Is the ID plumber exam open book?

Most PSI (IAPMO exam)-administered plumber exams allow a bound copy of the adopted code. Check with the Idaho Division of Occupational and Professional Licenses (DOPL) for approved reference materials.