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Exam Review

Key Facts: Journeyman Plumber Exam

70

G25 Exam Questions

ICC National Contractor/Trades Bulletin, June 30, 2026

4 hours

G25 Time Limit

ICC G25 outline

$120

G25 Exam Fee

ICC Pearson VUE listing

2018 IPC

G25 Reference Edition

ICC G25 outline

7 domains

G25 Content Outline

ICC G25 outline

Generally 70%

Contractor/Trades Passing Standard

ICC passing-score guidance; verify licensing requirements

G25 has 70 multiple-choice questions, a four-hour open-book limit and a $120 Pearson VUE fee. Its reference is the 2018 IPC. F25 is a separate 2015 IPC version with a three-hour limit. The practice bank contains 224 G25-core items and 31 labelled fuel-gas supplements; those supplements do not make fuel gas part of the G25 blueprint.

Sample Journeyman Plumber Practice Questions

Try these sample questions to review concepts for the Journeyman Plumber exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 255+ question experience with AI tutoring.

12018 IPC practice: A water service runs beside a sewer made of material not listed in Table 702.2. With only 3 feet horizontal separation and no crossing sleeve, which vertical arrangement satisfies the elevation exception?
A.Water service bottom 12 inches above the sewer top
B.Water service centerline 12 inches above sewer centerline
C.Water service top 12 inches above sewer bottom
D.Water service bottom level with sewer top
Explanation: 2018 IPC 603.2: Section 603.2 measures the exception from the bottom of the water service to the highest point of the sewer. Centerline spacing can leave less than the required clearance. The ordinary separation rule and other material or crossing exceptions are separate.
22018 IPC practice: A commercial project includes potable plumbing and gas distribution. Which reference does the IPC identify for fuel-gas distribution piping and equipment?
A.International Plumbing Code Chapter 9
B.International Fuel Gas Code
C.International Private Sewage Disposal Code
D.International Energy Conservation Code alone
Explanation: 2018 IPC 101.2; ICC National Contractor Bulletin G25: IPC scope assigns fuel-gas piping, gas-fired water heaters and their venting to the IFGC. This is a code-boundary question; it does not make the IFGC part of the G25 permitted-reference list.
32018 IPC practice: A designer assigns drainage fixture units before using the gravity drainage sizing tables. What does a DFU represent?
A.A fixed 7.5-gpm discharge from every fixture
B.A relative drainage loading factor for a fixture or group
C.The minimum residual water pressure at an outlet
D.The continuous flow capacity of a vent
Explanation: 2018 IPC 709.1, 709.3: DFUs represent relative drainage loads for the code sizing method, not a universal gallons-per-minute quantity. The separate conversion for a discharge known only in gpm is applied under Section 709.3; it does not redefine every fixture unit as 7.5 gpm.
42018 IPC practice: Exterior water piping is proposed 11 inches below grade where the frost line is 4 inches deep. Which minimum depth satisfies both stated IPC burial limits?
A.10 inches
B.11 inches
C.12 inches
D.16 inches
Explanation: 2018 IPC 305.4: The pipe must be at least 6 inches below the frost line and at least 12 inches below grade. The controlling depth is max(4 + 6, 12) = 12 inches. Protection against other damage remains necessary.
52018 IPC practice: For a manifold designed using the 4-ft/s column of Table 604.10.1, the maximum simultaneous demand is 8 gpm. What is the smallest listed nominal internal diameter that meets demand?
A.1/2 inch
B.3/4 inch
C.1 inch
D.1-1/4 inches
Explanation: 2018 IPC Table 604.10.1: At 4 ft/s the table permits 2 gpm for 1/2 inch, 6 for 3/4 inch, and 10 for 1 inch. Thus 1 inch is the smallest adequate choice. These are manifold table conditions, not a universal velocity limit for every copper installation.
62018 IPC practice: While stopping a leak, a plumber discovers that a concealed drain must be removed and replaced with new pipe. Under the unamended IPC administrative provisions, how is this work treated?
A.As exempt leak stopping regardless of replacement
B.As new work requiring a permit and inspection
C.As exempt if the replacement pipe has the same diameter
D.As exempt if only one fixture is affected
Explanation: 2018 IPC 106.1–106.2: The leak-stopping exemption ends when defective concealed piping must be removed and replaced. Section 106.2 treats that replacement as new work. Local administrative amendments and licensing requirements must also be checked.
72018 IPC practice: A 4-inch horizontal drain cleanout has only 14 inches of perpendicular working clearance. Its diameter is correct. What change is needed?
A.Increase the cleanout to 6 inches without moving the obstruction
B.Provide at least 18 inches of perpendicular clearance
C.Provide 12 inches measured along the pipe
D.Reduce the cleanout to 3 inches to create working room
Explanation: 2018 IPC 708.1.5, 708.1.9: For piping 6 inches and smaller, Section 708.1.9 requires at least 18 inches from the cleanout face perpendicular to the opening. Proper diameter alone does not provide access for cleaning.
82018 IPC practice: A potable copper joint uses solder containing 0.25% lead. The installer argues that it meets the 0.25% weighted wetted-surface limit. Which assessment is correct?
A.Accept because both limits are 0.25%
B.Reject because solder and flux are limited to 0.2% lead
C.Accept if the pipe itself is copper
D.Reject only if the entire assembly exceeds 8% lead
Explanation: 2018 IPC 605.2.1, 605.13.6: The 0.25% weighted-average limit for drinking-water components is distinct from the 0.2% chemical-composition limit for solder and flux. Solder containing 0.25% exceeds its own limit.
92018 IPC practice: A sink supply outlet has a 3/4-inch effective opening and is close to a wall as defined in Table 608.16.1. What minimum supply air gap applies?
A.1 inch
B.1-1/2 inches
C.2 inches
D.2-1/2 inches
Explanation: 2018 IPC Table 608.16.1: For sinks and similar fixtures with effective openings not greater than 3/4 inch, the table requires 1-1/2 inches away from walls and 2-1/2 inches close to a wall. Applying the away-from-wall value would understate the required protection.
102018 IPC practice: A residential clothes washer has a 2-inch standpipe and fixture drain connected to a 3-inch branch, but its trap is only 1-1/2 inches. Which correction is required?
A.Reduce the standpipe to match the trap
B.Increase only the downstream branch to 4 inches
C.Increase the trap to at least 2 inches
D.Keep the trap because the 3-inch branch compensates
Explanation: 2018 IPC 406.2; Table 709.1: The washer trap and fixture drain must each be at least 2 inches, and the fixture drain must connect to a branch or stack at least 3 inches. The branch already meets its specific minimum; the smaller trap remains defective. Correct downstream size cannot compensate for an undersized trap.

About the Journeyman Plumber Exam

ICC G25 is a contractor/trades examination based on the 2018 International Plumbing Code. It covers seven plumbing domains and is used by participating licensing authorities. Passing supplies an examination result; the authority separately decides experience, application and licence requirements.

Exam sponsor: International Code Council (ICC), delivered by Pearson VUE. The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Questions

70 questions

Time Limit

4 hours, open book (G25)

Passing Score

Generally 70% correct for ICC contractor/trades exams; verify jurisdiction requirements

Exam / Certification Fees

$120

Exam sponsor website

Reported exam pass rate: Not published by ICC. No exam-specific first-time pass rate is published in the cited ICC bulletin. Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Official sources

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.

40%

Administration and General Regulations

General installation requirements, terms, plan reading, testing, and materials.

17%

Plumbing Fixtures

Fixture categories, water heaters, and associated requirements.

14%

Water Supply and Distribution

Service piping, pressure, and potable water protection.

13%

Sanitary Drainage

Drainage systems, sumps/ejectors, and special waste systems.

7%

Plumbing Vent Requirements

Vent connections, grades, and terminal requirements.

7%

Traps, Interceptors, and Separators

Trap/interceptor/separator installation and compliance rules.

2%

Storm Drainage

Storm drainage design and code application.

Preparing for the Journeyman Plumber Exam

What You Need to Know

  • Passing score: Generally 70% correct for ICC contractor/trades exams; verify jurisdiction requirements
  • Exam length: 70 questions
  • Time limit: 4 hours, open book (G25)
  • Exam / certification fees: $120 Official sources

Using Our Practice Resources

  • Work through all 255 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

Journeyman Plumber: Suggested Study Strategy

1Confirm G25 and the 2018 IPC with the licensing authority before scheduling.
2Practice the seven domains in the published outline; Administration and General Regulations is 40%.
3Calculate DFU and water-supply loads using the correct fixture, group and pipe tables rather than a fixed DFU-to-gpm shortcut.
4Practice plan reading and trace fixture drains, vents and water services through diagrams.
5Review water heaters, potable-water protection, materials, testing and general installation rules.
6Use timed four-hour practice and keep an error log; open book does not mean time to research every answer.
7Keep fuel-gas supplemental work separate from the G25 outline and authorized reference list.

Frequently Asked Questions

What examination does this page prepare for?

The reference exam is ICC G25 Journeyman Plumber, based on the 2018 IPC. It is not a universal national licence or a UPC exam. Confirm that your licensing authority accepts G25.

How many questions and how much time does G25 have?

The June 30, 2026 ICC bulletin lists 70 multiple-choice questions and four hours, open book. Our 255 practice items include 224 G25-core questions and 31 fuel-gas supplements, not 255 questions on the actual exam.

How does F25 differ from G25?

F25 uses the 2015 IPC and allows three hours; G25 uses the 2018 IPC and allows four hours. Both listed examinations have 70 questions and a $120 Pearson VUE fee. They are distinct exam codes, so do not interchange their books or timing.

What score do I need, and is a pass rate available?

ICC generally requires 70% correct for contractor/trades exams, subject to the applicable licensing requirement. The cited official bulletin does not publish a G25 first-time pass rate; a claimed 50–60% pass rate is not supported.

Can I bring notes and books?

G25 lists the 2018 IPC as its authorized reference. ICC test-site rules permit bound references with pre-existing ink notes, highlighting and permanent tabs. Loose unauthorized papers, photocopied copyrighted references and prohibited electronic devices are not allowed. Follow the current appointment rules.

What does a drainage fixture unit mean?

A DFU represents a fixture’s relative drainage load for code sizing. It is not a universal conversion of 7.5 gallons per minute. Use the fixture or group value and the appropriate drainage table in the specified IPC edition.

Does G25 test fuel gas?

G25 lists the 2018 IPC and seven plumbing domains. G28 Journeyman Plumber with Gas is a different exam with IPC and IFGC references. This practice set labels its fuel-gas items as supplements; check your jurisdiction before studying for a combined exam.