What Is an Iowa Journeyperson Plumber?

Iowa defines a journeyperson as someone who works as an employee of, or otherwise under the direction of, a licensed master in the design, installation, and repair of plumbing systems.

The plumbing license covers a broad range of work within the property lines of a premises. It includes potable-water piping, fixtures, traps, drainage, vents, building drains, building sewers, storm drainage, water heaters, fuel-gas piping, and related plumbing components.

Why Is It Called Plumber "With Gas"?

Iowa's legal definition of plumbing includes fuel-gas piping associated with plumbing systems. That includes natural gas, propane, liquid propane, and other qualifying gas lines connected with plumbing equipment.

The current exam reflects that scope by dedicating part of the test to fuel gas piping.

Gas-related preparation should include:

• Fuel-gas piping materials
• Pipe sizing concepts
• Gas pressure
• Shutoff valves
• Appliance connections
• Piping installation rules
• Testing requirements
• Protection of fuel-gas piping

Gas piping represents only part of the exam, but it involves enough safety and code detail that treating it as a last-minute topic is not a great career strategy.

How Much Experience Do You Need?

Iowa's standard Journeyperson Plumber licensing route requires at least four years of practical experience as an apprentice.

For apprentice experience beginning January 1, 2010 or later, the required practical experience generally must come through a registered apprenticeship program recognized by the U.S. Department of Labor Office of Apprenticeship.

Iowa allows qualifying apprentices to enter the examination process before completing the entire apprenticeship.

How the Iowa Application Process Works

Candidates need approval from the Iowa Plumbing and Mechanical Systems Board before scheduling the examination.

1. Confirm that Journeyperson Plumbing is the correct discipline.
2. Complete the Iowa Examination Candidate Application.
3. Provide apprenticeship or qualifying experience information.
4. Pay the state examination approval fee.
5. Receive the Exam Approval Letter.
6. Register with Kirkwood Community College.
7. Schedule your testing appointment.
8. Pass the Journeyperson Plumber with Gas exam.
9. Finish the apprenticeship if you tested before graduation.
10. Submit the separate post-examination license application.

Passing the test does not automatically issue your license. Iowa requires the post-examination licensing application before the journeyperson credential becomes active.

If you need help organizing the application process, review 1ExamPrep application services.

Iowa Journeyperson Plumber with Gas Exam Format

Kirkwood Community College currently administers the examination for Iowa's Plumbing and Mechanical Systems Board.

Three hours for 75 questions gives you about 2.4 minutes per question. That is enough time for targeted code research, but it is not enough time to introduce yourself personally to every page of the plumbing code.

What Is on the Iowa Journeyperson Plumber Exam?

Sanitary Drainage and Vents are the two largest categories at 20 percent each. Together, those chapters account for 40 percent of the entire exam. That is a very loud hint about where a large piece of your study time should go.

Sanitary Drainage Is Worth 20 Percent

Drainage questions can test sizing, slope, materials, fittings, cleanouts, fixture connections, building drains, building sewers, and other installation requirements.

Review:

• Drainage fixture units
• Horizontal drainage piping
• Vertical stacks
• Pipe sizing
• Minimum slope
• Cleanout requirements
• Approved fittings
• Building drains
• Building sewers
• Testing requirements

Spend time with the drainage tables. Plumbing exam questions have an impressive ability to locate whichever table you hoped you could skip.

Venting Is Another 20 Percent

A drainage system needs proper venting so traps maintain their seals and the system can move waste and air correctly.

Practice topics such as:

• Individual vents
• Common vents
• Wet venting
• Vent sizing
• Vent connections
• Required vent locations
• Vent termination
• Horizontal and vertical venting rules

Do not simply memorize diagrams. Learn why the vent is placed where it is and how the code limits distances and sizing.

Water Supply and Distribution Is Worth 10 Percent

Potable-water systems need enough pressure and flow to serve fixtures while protecting the water supply from contamination.

Review:

• Water service sizing
• Water distribution sizing
• Fixture-unit calculations
• Pressure requirements
• Backflow protection
• Materials and fittings
• Valves
• Water-hammer control

Practice the tables rather than only reading them. Being familiar with the table layout can save valuable minutes during an open-book exam.

Storm Drainage Is Another 10 Percent

Storm drainage involves roof drains, leaders, conductors, storm piping, sizing, and the movement of rainwater away from a building.

Study rainfall-related sizing methods, roof drainage, secondary drainage where required, materials, connections, and storm-system installation.

Storm drainage is easy to overlook if most of your daily work is inside a bathroom or mechanical room. The exam, unfortunately, did not agree to overlook it with you.

Fuel Gas Piping Is Worth 9 Percent

Fuel-gas piping is a meaningful part of the Journeyperson Plumber with Gas examination.

Review:

• Gas piping materials
• Pipe sizing
• Appliance demand
• Gas pressure
• Shutoff valves
• Connections
• Protection from damage
• Pressure testing

Practice sizing questions until you can quickly identify the information you need before opening a table.

Fixtures, Fittings, and Water Heaters Matter Too

Fixtures and Fittings account for eight percent, and Water Heaters account for another eight percent.

Review fixture topics such as:

• Required fixtures
• Fixture installation
• Clearances
• Connections
• Approved materials
• Accessibility-related code provisions when applicable

For water heaters, review:

• Installation
• Temperature and pressure relief
• Drain piping
• Combustion and venting where applicable
• Protection from physical damage
• Required clearances and access

Do Not Ignore Indirect Waste, Traps, and General Regulations

General Regulations, Indirect Wastes, and Traps and Interceptors are each worth five percent.

Those smaller categories add up to 15 percent of the examination. That is too much of the test to classify as "maybe later."

Review topics including:

• Indirect waste receptors
• Air gaps
• Food-related indirect waste
• Trap seals
• Trap installation
• Interceptors
• General workmanship
• Protection of piping

Which Books Are Used on the Current Exam?

Iowa currently lists two references for the Journeyperson Plumber with Gas examination.

1. 2024 Uniform Plumbing Code
2. Iowa State Plumbing Code 2024 Amendment Booklet

Candidates can review the Iowa Journeyman Plumber with Gas Book Package for a focused reference set built around the 2024 plumbing code and Iowa state plumbing provisions.

Know the Open-Book Rules

Iowa's plumbing exam is open book, but the testing center controls which materials and markings are permitted.

Current Kirkwood rules allow:

• Approved reference books
• Bound or loose-leaf code references
• Highlighting completed before the exam
• Permanent tabs installed before testing
• A qualifying nonprogrammable battery-operated calculator
• An architect's scale or rule when needed

Current rules prohibit:

• Photocopied reference materials
• Handwritten notes inside references
• Loose supplemental study material
• Temporary Post-it style tabs
• Sharing references with another candidate
• Electronic study devices in the testing area

Prepare your books before exam day. The testing center is a bad place to learn that your carefully engineered rainbow of temporary tabs has been voted off the island.

Open Book Does Not Mean Open Vacation

Three hours gives you enough time to research selected details. It does not give you enough time to research every answer from scratch.

1. Identify the plumbing topic first.
2. Think of the likely UPC chapter.
3. Use the index when necessary.
4. Locate the controlling section or table.
5. Read exceptions and table notes.
6. Check the Iowa amendment when relevant.
7. Select the answer and keep moving.

Knowing that drainage is Chapter 7 and vents are Chapter 9 is much faster than asking the index where plumbing is every time.

Build Your Study Plan Around the Exam Weight

1. Start with Sanitary Drainage. It represents 20 percent of the examination.
2. Study Vents just as heavily. Venting is another 20 percent.
3. Review Water Supply and Distribution. This section contributes 10 percent.
4. Practice Storm Drainage. This is another 10 percent.
5. Study Fuel Gas Piping. Gas questions account for nine percent.
6. Review Fixtures, Fittings, and Water Heaters. Together they contribute another 16 percent.
7. Rotate through the smaller chapters. General Regulations, Indirect Waste, and Traps still matter.

Use Practice Questions to Improve Code Navigation

Practice tests are useful for more than predicting a score. They show you which chapters and tables slow you down.

1. Identify why the answer was wrong.
2. Find the correct UPC section.
3. Check whether an Iowa amendment changes the rule.
4. Read the complete requirement.
5. Redo any sizing calculation.
6. Practice another question from the same chapter.

If every vent question takes four minutes, spend more time in Chapter 9. If drainage sizing keeps causing trouble, practice the Chapter 7 tables. Your missed questions are basically leaving very specific study instructions.

Iowa Journeyperson License Term and Fee

Iowa Plumbing and Mechanical Systems credentials operate on a three-year licensing cycle.

Iowa also currently charges a $35 state exam-approval application fee. Kirkwood currently lists the Journeyperson Plumber with Gas examination fee at $119. Always verify testing fees when scheduling because fees can change.

Continuing Education Is Required for Renewal

A person holding a single Iowa Plumbing Journeyperson license currently needs eight hours of approved continuing education during the normal three-year licensing period.

The eight hours are divided into:

• 2 hours of Plumbing Code education
• 4 hours of Plumbing discipline education
• 2 hours of Iowa Occupational Health and Safety education

Iowa currently requires at least half of the applicable continuing education to be completed in person, while up to half may be completed online through approved courses.

Keep your completion certificates organized. "I remember taking that class" is not quite as persuasive as the certificate.

Journeyperson Is Not the Same as Plumbing Contractor

The Iowa Journeyperson Plumber license is an individual trade license. It does not automatically authorize the holder to operate an independent plumbing contracting business.

A journeyperson performs regulated work under the direction of a properly licensed master. Iowa separately regulates master and contractor licenses for businesses that contract with customers to provide plumbing services.

Prepare for Real Plumbing Work, Not Just 75 Questions

The Iowa Journeyperson Plumber with Gas examination is built around systems plumbers work with every day. Water has to reach fixtures safely. Waste has to leave the building. Traps need protection. Vents need to work. Water heaters need safe installation. Gas piping needs correct sizing and testing. Storm water needs somewhere appropriate to go.

Give the most study time to Sanitary Drainage and Vents because those two chapters make up 40 percent of the exam. Spend additional time on water supply, storm drainage, fuel gas, fixtures, water heaters, traps, interceptors, and indirect waste.

Most importantly, learn how to use the 2024 Uniform Plumbing Code quickly. Do not just read it. Practice finding sizing tables, definitions, exceptions, fixture rules, venting requirements, drainage requirements, gas provisions, and water-supply requirements under a timer.

Then compare relevant requirements with the Iowa State Plumbing Code amendments. The base code gives you the main road. Iowa's amendments tell you where the state moved a few of the signs.

When you are ready to organize your preparation, visit the Iowa Journeyman Plumber with Gas collection at 1ExamPrep to review current plumbing-code and Iowa-specific study resources.

You can also review the Iowa Journeyman Plumber with Gas Book Package for the 2024 Uniform Plumbing Code and Iowa State Plumbing Code materials used for focused preparation.

If study materials and licensing costs need to fit into a larger budget, review 1ExamPrep financing options.