2025 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.

To prepare for your journeyman plumber test, use our Jouneyman Plumber Practice Test.  Select the code year you need, 2021, 2018, 2015 or 2012 IPC/UPC. If you have questions on what code and code year applies to your plumber licensing test, check our Plumbing State Guides or contact your your testing jurisidction.

To prepare for a master plumber test, use our Master Plumber Practice Test.
 
 

Administrative Policies and Procedures

1. The provisions for licensing are determined by which of the following:
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2. Approved plans are required to be kept on a job site and available for inspection on demand by a code officer.
3. Who is allowed to apply for a plumbing permit?
4. Alterations made in an existing plumbing system are required to comply with current code requirements for plumbing systems.
5. Which of the following plumbing fixtures requires a plumbing permit and inspection for the replacement of the fixture in the same exact location?
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6. The plumbing code applies to new installations. Which of the following types of plumbing work may also be governed by the code?
7. A plumbing permit is required for the replacement of which of the following?

General Regulations

8. Many local code jurisdictions require a site plan before any work is done on an existing sewer or water service.
9. Trusses must not be _______________.
10. Mechanical joints are prohibited from joining materials of different types.
11. 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?
12. What is the purpose of the plumbing code?
13. When will a less stringent local plumbing code supersede state and federal codes?
14. All pipe used in plumbing applications will have all of the following markings except:
15. Which of the following is suitable for testing a DWV system for leaks?

Fixtures

16. What is the maximum distance an employee of a department store should have to walk to reach a suitable restroom facility?
17. The accessible travel route for people going to use public plumbing facilities must not pass through a kitchen.
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18. What is the maximum distance that a lavatory faucet for accessible use can be placed from the front edge of a lavatory?
19. What is the likely height of a handicap toilet?
20. What is the minimum unobstructed opening of egress when a shower door is installed for a typical shower?
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21. 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.
22. What is the minimum number of plumbing fixtures that must be installed in a single-family residence?
23. 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 and Special Wastes

24. Which of the following locations is not an acceptable location for an indirect waste receptor?
25. Clear water waste from a potable source, such as a relief valve on a water heater, must be piped to an indirect waste through an air gap.
26. Discharge tubing connected to a relief valve does not require traps for which of the following?
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27. What is the maximum allowable water temperature that can be used with a commercial dishwashing machine?
28. Which of the following is considered to be the best method for connecting an indirect waste to a sanitary drainage system?
29. The minimum vertical distance from the bottom of an indirect drain line to its receptor's flood rim is _____________________________.

Vents and Venting

30. Circuit vents may be _____________.
31. Which of the following types of fixtures can be served by a combination-waste-and-vent system?
32. Circuit vents can do which of the following?
33. Sumps used to hold sewage or house sewage pumps are required to be ________.
34. When you are required to size a waste stack vent you will need to know ____________.
35. Which of the following types of fixtures can be served by a combination-waste-and-vent system?
36. 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?
37. 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

38. If three 45-degree bends are used to make an offset, a cleanout is required at the top of the horizontal drain within 24 inches of where it connects with the last 45-degree bend.
39. When can a cleanout be used for the installation of a new fixture? In other words, what makes it acceptable to remove a cleanout plug, replace it with a male adapter and then extend piping from that point to a new fixture?
40. Which of the following are acceptable types of cleanouts?
41. What is the maximum distance that cleanouts can be installed from an access opening under a floor, such as in a crawl space?
42. What is the minimum depth of a trap seal?
43. One trap arm may serve a total of how many P-traps?
44. Flexible water connections are required to be _________.

Water Supply and Distribution

45. Which of the following is the proper term for piping that delivers potable water from a water source to a water-distribution system?
46. A water service is required to be protected from which of the following?
47. Which of the following devices can be used to increase water pressure when the pressure from a water source is not adequate for the needs of a plumbing system?
48. What is the maximum allowable flow rate and consumption for a lavatory installed for public use with a pressure rating requirement of 60 PSI?
49. Water heaters, hose bibs and sill cocks are normally protected from backflow with ________.

Sanitary Drainage Systems

50. Asbestos-cement pipe can only be joined by a sleeve coupling of the same composition as the pipe and sealed with an elastomeric ring.
51. Vents for vertical offsets are not required where the stack and its offset are _____ as a building drain.
52. Which of the following fittings are approved for changes in piping direction from horizontal to vertical?
53. What is the typical amount of grade required per liner foot on a household drainage pipe?
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54. What will result when a 4 inch pipe is reduced in size in the direction of the flow?

Special Piping and Storage Systems

55. Indirect waste receptors for sterilizers must be trapped and vented.
56. Ice makers and ice storage chests installed in healthcare facilities are required to be installed _______.
57. Aspirators are required to discharge their waste through which of the following?
58. In Med Gas systems, the exhaust from vacuum pumps must be discharged into the following:
59. Flux can only be used in the brazing process when:
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Water Heaters

60. Let's assume that you are responsible for the installation of a water-heating supply system. What type of equipment are you going to install on it?
61. Water heaters must be protected from back siphonage with the use of vacuum breakers.
62. The end of a discharge pipe connected to a relief valve is required to be threaded on the termination end.
63. Where is the maximum allowable working pressure of a storage tank and water heater required to be shown?
64. The minimum depth thickness for a water heater drip pan is __________________________.

Recycling Gray Water

65. Collection reservoirs for gray-water must be made of approved materials. To comply with this, a gray-water collection reservoir is required to be ___________.
66. Which of the following must be installed on a gray-water distribution system?
67. Gray water that enters a collection reservoir must be ________.
68. 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

69. Which of the following mediums is not allowed for use in testing gas pipe installations?
70. When testing gas piping installed in a single-family home, that has a volume of less than 10 cubic feet, the minimum length of time that the system must be tested is _________________.
71. Flexible gas connectors for all gas appliances, except cooking ranges and clothes dryers, are limited to a maximum length of _______ inches.
72. Gas piping installed in a laundry chute ____________.
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73. When flow controls are installed on gas piping, they _____________.

Math

74. What is the angle made when you offset a sewer with a 1/8 bend?
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75. 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?