Idaho - PLUMBING JOURNEYMAN EXAM

Idaho Plumbing Journeyman Exam: Your Complete Study Guide

Picture this: you've put in years as an apprentice, learned the trade inside and out, and now you're ready to take the next step in your plumbing career. The Idaho plumbing journeyman exam stands between you and the freedom to work independently, earn more money, and take on bigger projects. This isn't just another test—it's your ticket to professional advancement in one of Idaho's most stable trades.

Passing your Idaho Plumbing License exam means you can finally work without direct supervision, bid on jobs, and command the respect (and salary) that comes with journeyman status. But here's the thing: this exam is comprehensive, covering everything from basic code requirements to complex system sizing calculations. The good news? With the right preparation strategy, you can walk into that testing center confident and ready to pass.

In this guide, we'll break down everything you need to know about the Idaho plumbing journeyman exam practice requirements, what topics you'll face, and how to study effectively. Whether you're just starting your exam prep or looking to fill knowledge gaps, this article will help you create a winning study plan.

Idaho Plumbing Journeyman Exam Overview

The Idaho Plumbing Exam consists of 100 multiple-choice questions that you'll need to complete within 180 minutes—that's about 1.8 minutes per question, so time management is crucial. You'll need to score at least 70% (70 correct answers) to pass and earn your journeyman license.

The exam is administered by PSI Exams, and you can register through their exam registration page. Before you register, make sure you've met all the experience and education requirements outlined in the official exam bulletin.

What makes this exam particularly challenging is its heavy focus on the 2017 Idaho State Plumbing Code (ISPC). Unlike some trades that test general principles, this exam requires intimate knowledge of specific code sections, exact measurements, and precise requirements. You'll also face two special sizing questions worth 4 points each, where you'll analyze plumbing schematics—these can make or break your score.

The testing environment is computer-based, so you'll be clicking through questions on screen rather than filling in bubbles. This format actually works in your favor since you can easily flag questions to review later and navigate back and forth through the exam.

What Topics Are Covered on the Idaho Plumbing Journeyman Exam?

The exam covers the 2017 Idaho State Plumbing Code comprehensively, but the questions aren't distributed equally across all chapters. Understanding the weight of each topic helps you prioritize your study time effectively.

Heavy-Weight Topics (10+ questions each):
- Chapter 6 (11 questions): Water supply and distribution systems
- Chapter 7 (11 questions): Sanitary drainage systems
- Chapter 5 (10 questions): Water heaters and venting
- Chapter 9 (10 questions): Vents and venting systems

These four chapters alone account for 42% of your exam, so master them first. Chapter 6 and 7 are particularly crucial—they cover the bread-and-butter of plumbing work that you'll encounter daily as a journeyman.

Medium-Weight Topics (5-8 questions each):
- Chapter 12 (8 questions): Fuel gas piping
- Chapter 10 (7 questions): Traps, interceptors, and separators
- Chapter 8 (6 questions): Indirect waste and special wastes
- Chapters 1-4 (5 questions each): Administration, definitions, general regulations, and fixtures

Light-Weight Topics (1-4 questions each):
- Chapter 11 (4 questions): Storm drainage
- Chapter 15 (2 questions): Alternate water sources
- Chapters 14, 16, and 17 (1 question each): Special systems and standards

Don't ignore the light-weight topics entirely—those few questions could be the difference between passing and failing. However, if you're short on study time, focus your energy on the heavy and medium-weight areas first.

The two plumbing sizing questions using provided schematics deserve special attention. These are worth double points (4 points each instead of the usual 1 point), so getting them right significantly boosts your score.

Sample Idaho Plumbing Journeyman Exam Questions

To give you a feel for what you'll encounter on test day, here are some actual sample questions from our practice exam database. Notice how they test specific code knowledge and practical application:

Question 1: You are a journeyman plumber installing a gas-fired water heater in a homeowner's bathroom closet. According to the 2017 ISPC, which of the following requirements must be met for this installation to be code-compliant?

A) The closet must have a standard hollow-core door and combustion air from the bathroom
B) The closet must be equipped with a listed, gasketed door assembly with a self-closing device, and combustion air must be obtained from the outdoors
C) The water heater must be elevated at least 18 inches above the floor with no special door requirements
D) The closet must have a ventilation fan running continuously and a fire-rated door

Question 2: You are a journeyman plumber installing a new commercial dishwashing machine in a restaurant kitchen. The inspector asks you to verify the backflow prevention requirements for the unit. According to the referenced standards in Table 1701.1 of the 2017 ISPC, which standard specifically addresses backflow prevention requirements for commercial dishwashing machines?

A) ASSE 1001-2008
B) ASSE 1002-2008
C) ASSE 1004-2008
D) ASSE 1022-2003

Question 3: Each vent pipe or stack terminating through the roof shall extend vertically not less than how many inches above the roof?

A) 3 inches
B) 12 inches
C) 6 inches
D) 10 inches

Question 4: What is the maximum gray water discharge capacity that exempts a single family dwelling from requiring a registered design professional to design the gray water system?

A) 100 gallons per day
B) 150 gallons per day
C) 250 gallons per day
D) 500 gallons per day

Question 5: As a journeyman plumber, you have completed a rough-in installation of a drainage system in a new residential construction. The general contractor asks you to allow the drywall crew to begin covering the walls immediately. What does the 2017 ISPC require before the walls can be covered?

A) The homeowner must sign a waiver acknowledging the work was completed
B) The drainage system must be tested, inspected, and approved before being concealed
C) Only a final inspection is needed after the drywall is installed
D) A photograph of the work is sufficient documentation in lieu of inspection

Think you know the answers? These questions demonstrate the level of specific code knowledge you'll need. Our free practice exam includes 10 questions like these to help you gauge your readiness—no account required, and you can retake it as many times as you want.

What Types of Questions to Expect

Based on our analysis of over 1,700 practice questions covering all exam topics, here's what you can expect:

Code Interpretation Questions: The majority of questions test your ability to find and apply specific code requirements. You'll see scenarios like "A plumber is installing X system in Y location—what does the code require?" These questions reward thorough code book knowledge and good test-taking strategies.

Calculation and Sizing Problems: Beyond the two special schematic questions, you'll encounter problems requiring calculations for pipe sizing, fixture units, and system capacities. Chapter 6 and 7 questions often involve mathematical applications of code tables and formulas.

Safety and Inspection Requirements: Questions covering when inspections are required, what safety measures must be in place, and proper installation procedures. Chapter 1 (Administration) heavily emphasizes these topics.

Material and Equipment Standards: Expect questions about approved materials, equipment standards (like those ASSE standards in the sample question), and proper installation methods. These often reference specific tables and appendices in the code book.

Venting and Drainage Applications: With 21 questions between Chapters 7 and 9, you'll face numerous scenarios about proper venting configurations, drainage system design, and trap requirements.

The special plumbing sizing questions using provided schematics are unique. You'll receive detailed drawings showing proposed plumbing systems and must calculate proper pipe sizes, fixture units, or system capacities. These questions test your ability to apply code requirements to real-world installations—exactly what you'll do as a journeyman.

Essential Study Materials for Success

Your success on the Idaho plumbing journeyman exam depends heavily on having the right study materials and using them effectively.

Required Code Book: You'll need a copy of the 2017 Idaho State Plumbing Code for the exam. This isn't optional—it's your primary reference during the test. Make sure you get a version that allows highlighting and tabbing, as these study aids are permitted during the exam.

Study Aids: Invest in quality Sharpie Highlighters to mark important sections, formulas, and frequently referenced tables. The wide barrel and large ink supply ensure your highlighting won't fade during long study sessions, and the narrow chisel tip works perfectly for both highlighting text and writing margin notes.

For organization, Redi-Tag Permanent White Tabs are invaluable for creating a custom index system in your code book. With 375 tabs per pack, you can mark every important section, table, and formula for quick reference during the exam. The laser-printable surface lets you create professional-looking labels for different chapters and topics.

Practice Exams: This is where most candidates either succeed or struggle. Our practice exam system includes over 1,700 questions covering every topic on the real exam. The questions match the difficulty and format you'll encounter, and you get detailed explanations for every answer.

Additional Resources: Consider supplementary materials like plumbing calculation guides and code commentary books, but remember—the exam tests the code as written, not interpretations or alternative methods.

Proven Study Tips for Journeyman Exam Questions

After helping thousands of plumbers pass their licensing exams, here are the strategies that consistently work:

Master Your Code Book Navigation: Speed matters when you have 1.8 minutes per question. Create a detailed tab system and practice finding information quickly. Know exactly where to find fixture unit tables, pipe sizing charts, and venting requirements without hunting through pages.

Focus on High-Yield Topics First: Those 42 questions from Chapters 5, 6, 7, and 9 should be your priority. If you only have limited study time, master these topics before moving to lighter-weight areas.

Practice Under Test Conditions: Take practice exams with the same 180-minute time limit. This builds your stamina and helps you develop a pacing strategy. Many candidates know the material but run out of time due to poor pacing.

Understand the "Why" Behind Requirements: Don't just memorize code sections—understand the reasoning. This helps you eliminate obviously wrong answers even when you're not 100% certain of the correct one.

Flag and Return Strategy: Use the computer format to your advantage. Flag difficult questions immediately and return to them after completing easier ones. This ensures you don't leave easy points on the table while struggling with tough problems.

Avoid the common mistake of over-studying light-weight topics while neglecting heavy-weight ones. Some candidates spend weeks memorizing every detail about storm drainage (4 questions) while being shaky on water supply systems (11 questions).

Frequently Asked Questions

How much do journeyman plumbers make in Idaho? According to recent data, journeyman plumbers in Idaho earn between $45,000 and $65,000 annually, with experienced journeymen in high-demand areas like Boise earning even more. Your earning potential increases significantly compared to apprentice wages, and you gain the flexibility to work independently or start your own business.

Can I bring my code book to the exam? Yes, you're allowed to bring the 2017 Idaho State Plumbing Code to the exam. You can highlight and tab it, but no loose notes or additional materials are permitted. This is why creating a good indexing system during your study preparation is so valuable.

What happens if I fail the exam? If you don't pass, you can retake the exam after waiting a specified period (check the state licensing website for current requirements). You'll need to pay the exam fee again, but you can use the same study materials. Many candidates pass on their second attempt after identifying weak areas from their first attempt.

How soon can I get my results? Computer-based exams provide immediate preliminary results when you finish. Official results and licensing information follow through the mail within a few business days.

Your Path to Plumbing Success Starts Now

Passing the Idaho plumbing journeyman exam opens doors to career advancement, higher earnings, and professional independence. While the exam is challenging, thousands of plumbers have successfully made this transition with proper preparation.

Remember, this isn't just about memorizing code sections—it's about demonstrating your readiness to work safely and competently without supervision. The 100 questions and 180-minute time limit test both your knowledge and your ability to apply that knowledge under pressure.

Ready to test your current knowledge? Start with our free practice exam to see how you'd score today. Then, create your study plan focusing on the heavy-weight topics while building speed and confidence with regular practice tests. Your journeyman license—and the career opportunities that come with it—are within reach.