100+ Free MT Journeyman Plumber Practice Questions

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Under the Uniform Plumbing Code adopted by Montana, what is the minimum size for a building sewer?

2 inches

3 inches

4 inches

6 inches

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Free Journeyman Plumber Practice Test by State 2026: 4,700+ Questions24 min read

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Key Facts: MT Journeyman Plumber Exam

70%

Passing Score

MT Board of Plumbers

UPC 2021

Code Edition

Open-book exam

$270

Exam Fee

GITS

Written+Practical

Exam Format

Isometric component

The Montana journeyman plumber exam is unique in requiring both written and practical components. The written portion tests UPC 2021 knowledge in an open-book format. The practical portion requires reading and drawing isometric plumbing diagrams. The exam fee is $270 and a 70% score is required to pass.

Sample MT Journeyman Plumber Practice Questions

Try these sample questions to test your MT Journeyman Plumber exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Under the Uniform Plumbing Code adopted by Montana, what is the minimum size for a building sewer?

A.2 inches

B.3 inches

C.4 inches

D.6 inches

Explanation: Under the UPC 2021 adopted by Montana, the minimum building sewer size is 3 inches. However, if a water closet is connected, a 4-inch minimum applies. The 3-inch minimum pertains to building sewers serving fixtures without water closets. Montana's Board of Plumbers enforces UPC standards through the GITS examination process.

2What is the minimum slope required for a 4-inch horizontal drainage pipe under the UPC?

A.1/16 inch per foot

B.1/8 inch per foot

C.1/4 inch per foot

D.1/2 inch per foot

Explanation: Under the UPC 2021, horizontal drainage pipes 4 inches and larger require a minimum slope of 1/8 inch per foot. Pipes 3 inches and smaller require 1/4 inch per foot. Montana follows these UPC slope requirements for all plumbing installations inspected under the Board of Plumbers.

3According to the UPC, what is the drainage fixture unit (DFU) value for a standard water closet?

A.2 DFU

B.3 DFU

C.4 DFU

D.6 DFU

Explanation: Under the UPC 2021, a standard water closet (toilet) is rated at 4 DFU. This value is used to calculate drain pipe sizing and loading on the drainage system. Montana plumbers must use UPC DFU values when designing and installing plumbing systems.

4In Montana, what is the minimum required distance for a cleanout from a change of direction greater than 45 degrees in a horizontal drain?

A.Within 5 feet

B.Within 10 feet

C.At each change of direction

D.Within 25 feet

Explanation: Under the UPC 2021, a cleanout must be installed within 5 feet of any change of direction greater than 45 degrees in a horizontal drain. Cleanouts provide access for clearing blockages and are required at regular intervals. Montana inspectors verify cleanout placement during rough-in inspections.

5Under the UPC, what is the maximum horizontal distance allowed between cleanouts in a building drain?

A.50 feet

B.75 feet

C.100 feet

D.150 feet

Explanation: The UPC 2021 requires cleanouts to be installed at intervals not exceeding 100 feet in horizontal drainage lines. This applies to building drains and building sewers. Montana plumbing inspectors verify cleanout spacing during rough-in and final inspections.

6What type of fitting is required when connecting a horizontal branch to a vertical drain stack under the UPC?

A.Sanitary tee

B.Short-turn 90-degree elbow

C.Wye with 45-degree bend

D.Double wye

Explanation: Under the UPC, a sanitary tee is the appropriate fitting for connecting a horizontal branch to a vertical drain stack. The sweep of the sanitary tee directs flow downward properly. Montana plumbers must use approved fittings per UPC Table 706.3 for all drainage installations.

7On Montana's plumber exam, candidates may be asked to interpret isometric drawings. What does a dashed line typically represent in a plumbing isometric drawing?

A.Hot water supply

B.Cold water supply

C.Drainage piping

D.Vent piping

Explanation: In plumbing isometric drawings, dashed lines typically represent vent piping, while solid lines represent drainage piping. Montana's exam administered by GITS includes a practical component requiring candidates to read and interpret isometric drawings. Understanding line conventions is essential for both the written and practical portions.

8Under the UPC adopted by Montana, what is the minimum trap size for a residential lavatory?

A.1 inch

B.1-1/4 inches

C.1-1/2 inches

D.2 inches

Explanation: The UPC 2021 requires a minimum trap size of 1-1/4 inches for residential lavatories. The trap must be the same size as the fixture outlet or tailpiece. Montana's Board of Plumbers enforces UPC trap sizing requirements during inspections.

9What is the minimum vent pipe size permitted under the UPC?

A.3/4 inch

B.1 inch

C.1-1/4 inches

D.1-1/2 inches

Explanation: The UPC 2021 specifies that no vent pipe shall be less than 1-1/4 inches in diameter. This minimum applies to individual vents, circuit vents, and other vent types. Montana plumbers must follow UPC vent sizing tables for all installations.

10What is the minimum water supply pressure required at a fixture under the UPC?

A.5 psi

B.8 psi

C.15 psi

D.20 psi

Explanation: Under the UPC 2021, the minimum water pressure required at a fixture is 8 psi (pounds per square inch) for most fixtures. Some fixtures like flushometer valves may require higher pressure (typically 15-25 psi). Montana plumbers must verify adequate pressure at all fixtures.

About the MT Journeyman Plumber Exam

Montana requires both a written and practical (isometric drawing) exam for journeyman plumber licensure. The written exam is open book using the UPC 2021 and is administered by GITS on behalf of the Montana Board of Plumbers. Montana is one of few states with a practical isometric component.

Questions

100 scored questions

Time Limit

Written + Practical

Passing Score

70%

Exam Fee

$270 (Montana Board of Plumbers (GITS))

MT Journeyman Plumber Exam Content Outline

25%

Drainage, Waste & Vent Systems

UPC 2021 drainage pipe sizing, DFU calculations, slope requirements, cleanouts, and trap arm distances

20%

Venting Systems

Vent sizing, wet venting, AAVs, vent termination, circuit venting, and combination waste and vent

20%

Water Supply & Backflow Prevention

Water pipe sizing, WSFU calculations, backflow prevention, pressure regulation, and cross-connection control

15%

Gas Piping & Venting

Gas pipe sizing, BTUH calculations, pressure testing, combustion air, and appliance venting per UPC

20%

Fixtures, Code Admin & Isometric Drawings

Fixture installation, clearances, permits, inspections, isometric drawing interpretation, and Montana-specific rules

How to Pass the MT Journeyman Plumber Exam

What You Need to Know

Passing score: 70%
Exam length: 100 questions
Time limit: Written + Practical
Exam fee: $270

Keys to Passing

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

MT Journeyman Plumber Study Tips from Top Performers

1Practice reading and drawing isometric plumbing diagrams — Montana's practical exam tests this skill directly

2Master UPC 2021 drainage and vent sizing tables — these are heavily tested

3Learn to navigate the UPC index quickly — the open-book format rewards efficient code lookup

4Memorize DFU values for common fixtures and trap arm distances by pipe size

5Study UPC gas piping sizing tables and BTUH calculations for fuel gas appliances

6Review Montana-specific licensing requirements and Board of Plumbers regulations

Frequently Asked Questions

Does Montana's plumber exam have a practical component?

Yes, Montana is one of few states that requires both a written and practical exam. The practical portion tests your ability to read and draw isometric plumbing diagrams. Both components are administered by GITS on behalf of the Montana Board of Plumbers.

Is the Montana plumber exam open book?

Yes, the written portion of Montana's journeyman plumber exam is open book. You may bring the UPC 2021 codebook. No other references, notes, or electronic devices are permitted during the exam.

What plumbing code does Montana use?

Montana uses the Uniform Plumbing Code (UPC) 2021 edition published by IAPMO. The exam tests knowledge of UPC provisions including drainage, venting, water supply, gas piping, and fixture installation requirements.

How much does the Montana plumber exam cost?

The Montana journeyman plumber exam fee is approximately $270, which covers both the written and practical components. This fee is paid to GITS, the exam administrator.