ICC G24 Master Plumber Exam (2018 IPC) Practice Exam
Free Practice Exam
Test your knowledge with 10 questions from our pool of 20 free questions.
- 10 questions per attempt
- 30 minute time limit
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Full Practice Exam
Complete exam simulation matching the real Pearson VUE test format.
- 100 questions (same as real exam)
- 240 minute time limit
- 7 topic areas covered
- 430 questions in pool
- Detailed explanations
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ICC G24 Master Plumber (2018 IPC) Practice Exam Guide
What's on the exam
Questions per topic, out of 100This practice exam follows the official content outline for the ICC G24 Master Plumber (2018 IPC) exam: Administration General Regulations, Plumbing Fixtures, Water Supply and Distribution, Sanitary Drainage, Plumbing Vent Requirements, Traps, Interceptors, and Separators, Storm Drainage.
You can practice two ways. The free practice exam gives you 10 questions per attempt, and you can retake it whenever you like. The full practice exam gives you 100 questions on a 4 hours clock, with a new draw from our question bank each attempt.
Administration General Regulations 46 items
Our study plan for this topic: General Installation Requirements; Code Definitions and Terms; Plan Reading; Testing; Materials; Permits and Permit Issuance; Inspections and Inspection Procedures; Code Official Authority and Duties.
Plumbing Fixtures 14 items
Our study plan for this topic: Water Heaters; Water Closets and Urinals; Specialty Fixtures; Bathtubs, Showers, Sinks, and Lavatories; Minimum number of required plumbing fixtures by occupancy type; Fixture installation requirements and spacing dimensions; Faucets, fixture fittings, and temperature control devices; Flushing devices for water closets and urinals.
Water Supply and Distribution 11 items
Our study plan for this topic: Service Distribution and Piping; Water Supply and Pressure; Protection of Potable Water Supply; Pipe Materials, Fittings, and Joining Methods; Fixture Flow Rates and Minimum Supply Pipe Sizing; Valve Requirements and Location; Hot Water Supply System Requirements; Water Pressure Booster Systems and Storage Tanks.
Sanitary Drainage 11 items
Our study plan for this topic: Building Sanitary Drainage; Sumps and Ejectors; Indirect and Special Waste Systems; Drainage pipe materials and applicable standards (above-ground, underground, and building sewer); Drainage pipe joints and connection methods by material type; Slope and installation requirements for horizontal drainage piping; Drainage fixture unit values and system sizing; Cleanout requirements, placement, sizing, and access.
Plumbing Vent Requirements 8 items
Our study plan for this topic: Vent Connections and Grades; Vent Terminals; Vent Pipe Sizing and Developed Length; Types of Venting Systems (Individual, Common, Wet, Circuit, Combination, Waste Stack, Single-Stack); Air Admittance Valves; Fixture Trap Distance from Vent; Vent Stack and Stack Vent Requirements; Relief Vents for Multi-Story Stacks.
Traps, Interceptors, and Separators 8 items
Our study plan for this topic: Installation of Traps; Interceptors and Separators; Prohibited trap types; Trap seal requirements and protection methods; Fixture trap sizing and dimensional requirements; Grease interceptor sizing and capacity requirements; Oil separator design and applicability; Sand, solids, and specialty interceptors (clothes washers, bottling plants, slaughterhouses).
Storm Drainage 2 items
Our study plan for this topic: Storm Drainage; Sizing of conductors, leaders, and storm drain piping using rainfall rate data and sizing tables; Primary and secondary (emergency overflow) roof drain requirements and scupper design; Permitted materials for storm drainage conductors, underground storm drain pipe, building storm sewer pipe, and subsoil drain pipe; Prohibited connections and restricted uses of storm drainage piping; Storm drainage traps: when required, sizing, materials, and cleanout provisions; Roof design for ponding loads and blocked primary drain assumptions; Horizontal gutter sizing and vertical wall area calculations.
Sample 1 — Administration General Regulations
Question: A down-flow air handler produces condensate and has no secondary drain connection and no space to install an auxiliary drain pan. A water-level monitoring device that shuts off the equipment when the primary drain becomes restricted must be installed in what location?
- A. In a field-installed overflow line
- B. Inside the primary drain pan
- C. At the condensate discharge point
- D. In the primary drain line
Correct Answer: B
IPC 2018 Section 314.2.3.1 requires that on down-flow units and other coils without a secondary drain or provisions for an auxiliary drain pan, the water-level monitoring device be installed inside the primary drain pan; devices installed in the drain line are not permitted.
Reference: IPC 2018 Chapter 3 — Section 314.2.3.1 Water-Level Monitoring Devices
Sample 2 — Plumbing Fixtures
Question: A custom shower compartment is designed with a least interior dimension of 25 inches, measured from the finished interior surfaces. What minimum interior cross-sectional area must the compartment have to be approved?
- A. 900 square inches
- B. 1,300 square inches
- C. 1,500 square inches
- D. 1,024 square inches
Correct Answer: B
Per IPC 2018 Section 421.4, shower compartments shall be not less than 900 square inches in area and not less than 30 inches in least dimension; the exception permits a least dimension of not less than 25 inches provided the compartment has not less than 1,300 square inches of cross-sectional area.
Reference: IPC 2018 Chapter 4 — Section 421.4 Shower Compartments
Sample 3 — Water Supply and Distribution
Question: What is the effect on the pressure rating of CPVC plastic pipe when it is threaded?
- A. The pressure rating is reduced by 75 percent
- B. The pressure rating is reduced by 50 percent
- C. The pressure rating is unaffected
- D. The pressure rating is reduced by 25 percent
Correct Answer: B
Per IPC Section 605.14.3, when CPVC pipe is threaded, the pressure rating of the threaded pipe shall be reduced by 50 percent. Additionally, the pipe must have a wall thickness of not less than Schedule 80.
Reference: IPC 2018 Section 605.14.3
Your first attempt tells you where you're starting from. After every attempt, the results page shows your score for each outline topic, so you can see what to study next. Compare your score with the real exam's passing score, 70% correct, and keep going until you pass consistently.
- Answer the questions you know first, and bookmark the rest. Our practice exams let you bookmark and come back.
- Return to your bookmarks on the second pass.
- Keep a steady pace. The real exam works out to about 2 minutes 24 seconds per question.
- After each attempt, look up each missed question's reference and read the section.
| Questions | 100 questions |
| Time limit | 4 hours |
| Passing score | 70% correct |
| Books in the exam room | Open book |
| Exam fee | $120 |
- Results for examinations taken electronically are available immediately after the examination is completed.
- You must wait 10 days before retaking a failed exam.
Source: National Contractor/Trades Examination Information Bulletin, PUBLISHED June 30, 2026; ICC Exam Catalog, checked October 6, 2026. Check the bulletin before test day: fees and rules can change.