2024 Edition

Plumbing Practice Test

This free plumbing practice test will give you an idea of the types of questions that appear on actual plumbing licensing exams. 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.

Administrative Policies and Procedures

1. A plumbing permit is required for the replacement of which of the following?
2. The provisions for licensing are determined by which of the following:

General Regulations

3. Which of the following is suitable for testing a DWV system for leaks?
4. All pipe used in plumbing applications will have all of the following markings except:


5. What is the likely height of a handicap toilet?
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6. What is the minimum unobstructed opening of egress when a shower door is installed for a typical shower?

Indirect and Special Wastes

7. Which of the following is considered to be the best method for connecting an indirect waste to a sanitary drainage system?
8. The minimum vertical distance from the bottom of an indirect drain line to its receptor's flood rim is _____________________________.

Vents and Venting

9. Which of the following types of fixtures can be served by a combination-waste-and-vent system?
10. You are connecting two back to back lavatories, two urinals and two water closets to one horizontal branch. What are the maximum number fixtures that can be connected to a horizontal branch?
11. Piping for building drains and horizontal drainage branches require the installation of cleanouts. Spacing for these cleanouts is determined by the diameter of the drain and other factors. In this scenario the drain pipe diameter is three inches. This drain has a running length of 40 feet. During this run the pipe takes one 90-degree turn and on one 45-degree turn. How many cleanouts are required for this installation?

Traps and Cleanouts

12. One trap arm may serve a total of how many P-traps?
13. Flexible water connections are required to be _________.
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Water Supply and Distribution

14. Water heaters, hose bibs and sill cocks are normally protected from backflow with ________.

Sanitary Drainage Systems

15. What is the typical amount of grade required per liner foot on a household drainage pipe?
16. What will result when a 4 inch pipe is reduced in size in the direction of the flow?

Special Piping and Storage Systems

17. In Med Gas systems, the exhaust from vacuum pumps must be discharged into the following:
18. Flux can only be used in the brazing process when:

Water Heaters

19. Where is the maximum allowable working pressure of a storage tank and water heater required to be shown?
20. The minimum depth thickness for a water heater drip pan is __________________________.

Recycling Gray Water

21. Gray water that enters a collection reservoir must be ________.
22. What is the maximum amount of time that gray water is allowed to be retained for use to flush a toilet or urinal?

Fuel Gas

23. Gas piping installed in a laundry chute ____________.
24. When flow controls are installed on gas piping, they _____________.


25. What is the angle made when you offset a sewer with a 1/8 bend?
26. What is the total pressure in pound per square inch (psi) on a 6 inch diameter test plug with a water head of 15 feet?

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

John Richardson
 is a master plumber who has been in the plumbing business since 1977. He is a certified continuing education instructor for plumbing in Texas and teaches CPE classes to journeyman and master plumbers to renew their licenses. John holds a B.A. degree in English from Texas A&M University. He owns State-Wyed Plumbing and Septic in Katy, Texas.

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 education instructor and apprentice instructor for over twenty years with the United Association of Plumbers and Pipefitters.