2023 Edition

Master Plumber Practice Exam

This free plumbing practice test will give you an idea of the types of questions that appear on an actual master plumber licensing exam. Plumbing exams vary by state but most all states and local plumbing jurisdictions have adopted either the IPC or the UPC plumbing codes. Typical exam sections include: fixtures, sanitary drainage systems, administrative policies, venting, indirect and special wastes, etc.

For more comprehensive practice, try our
Complete Master Plumber Practice Test with 600 questions.

General Regulations

1. Code interpretation is a critical element of success when working with the code requirements and regulations. Who does the code authorize to interpret the plumbing code?
2. What is the purpose of the plumbing code?
3. When will a less stringent local plumbing code supersede state and federal codes?

Administrative Policies

4. Which of the following plumbing fixtures requires a plumbing permit and inspection for the replacement of the fixture in the same exact location?
5. The plumbing code applies to new installations. Which of the following types of plumbing work may also be governed by the code?


6. Assume that you have been contracted to add a new bathroom group to an existing plumbing system. This is a toilet, lavatory and bathtub that will be installed in a new addition to a home. You will need a permit for the installation. Your plan is to connect the main drain from the bathroom group to the building drain. This could create a problem. From the choices below, choose the most likely concern.
7. What is the minimum number of plumbing fixtures that must be installed in a single-family residence?
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8. You are installing accessible plumbing fixtures. You had journeyman plumbers set the fixtures and you review the work prior to calling for a code enforcement inspection. Visually, something looks wrong to you. Your concern is that the faucets on the lavatories will be difficult to reach for disabled people. Using your tape measure, you check the distance from the front of the lavatory. What is the maximum distance that a lavatory faucet for accessible use can be placed from the front edge of a lavatory?

Indirect & Special Wastes

9. Discharge tubing connected to a relief valve does not require traps for which of the following?
10. What is the maximum allowable water temperature that can be used with a commercial dishwashing machine?


11. Circuit vents may be _____________. 
12. When you are required to size a waste stack vent you will need to know ____________. 

Traps and Cleanouts

13. What is the maximum distance that cleanouts can be installed from an access opening under a floor, such as in a crawl space?
14. What is the minimum depth of a trap seal?

Waste Water and Distribution

15. What is the maximum allowable flow rate and consumption for a lavatory installed for public use with a pressure rating requirement of 60 PSI?

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Quality starts with who wrote the material.
Our practice exam writer
Dodge Woodson
 was a master plumber and gas fitter for over 30 years. He built his own plumbing business and has trained countless plumbers. In addition to being a field plumber and contractor, Woodson served as adjunct faculty at Central Maine Technical College where he taught both plumbing licensing preparation courses and plumbing apprenticeship courses. As R. Dodge Woodson, he is a best-selling author and is the most prolific plumbing author in print with McGraw-Hill. He is often referred to as America’s Plumber.

Charles Redecker
 is a master plumber instructor and education director with the National Center for Construction Education and Research. Charles has taught plumbing with the NCCER for over 10 years. Prior to working with the NCCER, Charles taught plumbing at the Rankin Technical College. Charles has owned and run various plumbing businesses since 1979 in St. Louis, Missouri.

Terry Lunt
 is a plumbing and master craft instructor with Associated Builders and Contractors in Southern California. He has also been a core curriculum instructor and subject matter expert in plumbing with the National Center for Construction Education and Research. Terry has worked in the plumbing industry for over 30 years.

Joseph Cromwell
 is a master plumber in Illinois and Indiana. He was a continuing educaiton instructor and apprentice instructor for over twenty years with the United Association of Plumbers and Pipefitters.