100+ Free NBOPE Journeyperson Plumber Practice Questions

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Question 1

Score: 0/0

Under UPC-style trap-arm tables, what is the common maximum trap-to-vent distance for a 1-1/2 inch trap arm?

2 feet

5 feet

3 feet 6 inches

8 feet

to track

2026 Statistics

Key Facts: NBOPE Journeyperson Plumber Exam

150

Exam Questions

NBOPE/NITC

Open-Book Questions

NBOPE

100

Closed-Book Questions

NBOPE

4 hours

Total Time

2 hours per part

75%

Passing Score

113 cumulative points

$250

Base Fee

2026 application

$340

Prometric Total

$250 + $90

3 years

Certification Validity

NITC

The current NBOPE Journeyperson Plumber exam is a two-part, 150-question multiple-choice test based on the adopted UPC. Candidates take a 50-question open-book section and a 100-question closed-book section, with two hours allowed for each part. Passing requires 75% or 113 cumulative points. The base test fee is $250, with an additional $90 Prometric fee for a Prometric test center. The largest content area is Sanitary Drainage, Vents, and Storm Drainage Related Drawings at 39.33%.

Sample NBOPE Journeyperson Plumber Practice Questions

Try these sample questions to test your NBOPE Journeyperson Plumber exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1On an NBOPE/IAPMO UPC plumbing exam item, who has the authority to interpret and enforce the plumbing code in the jurisdiction?

A.The general contractor

B.The Authority Having Jurisdiction (AHJ)

C.The fixture manufacturer

D.The building owner

Explanation: The AHJ is the official or agency responsible for code administration, interpretations, inspections, approvals, and enforcement. Journeyperson questions often test whether you know who may approve an alternate method or require corrections.

2Which publication is the primary technical reference for the current NBOPE Journeyperson Plumber examination?

A.International Residential Code only

B.Uniform Plumbing Code published by IAPMO

C.NFPA 70 National Electrical Code

D.ASHRAE 62.1 ventilation standard

Explanation: The official NBOPE materials identify the current adopted Uniform Plumbing Code as the primary reference. Fuel-gas and other referenced standards matter, but the UPC is the controlling plumbing-code source for this exam.

3Before installing or substantially altering a plumbing system, what is generally required unless the work qualifies as a minor repair exemption?

A.A plumbing permit issued under the local code administration process

B.Only a verbal agreement with the owner

C.A manufacturer's letter stating the work is simple

D.No approval if the work is hidden inside a wall

Explanation: UPC administration provisions generally require permits before plumbing systems are installed, altered, repaired, replaced, or remodeled. Minor repair exceptions are narrow and do not cover new concealed work or system alterations.

4A plumber wants to use a new pipe material that is not specifically named in the adopted code. What is the proper code path?

A.Install it if it is cheaper than listed materials

B.Use it only if the AHJ approves it as equivalent and it is supported by listing, testing, or other acceptable evidence

C.Use it without review if the owner signs a waiver

D.Install it only on cold-water piping and avoid hot-water piping

Explanation: Alternate materials and methods require approval by the AHJ based on evidence that they are at least equivalent in quality, strength, effectiveness, fire resistance, durability, and safety. A product listing or recognized standard is usually the evidence used to support approval.

5What does it mean when a plumbing product must be listed and labeled for a specific use?

A.It must be sold by a wholesaler in the same city

B.It has been evaluated by an accepted listing agency or standard for that intended use

C.It can be used for any system if the installer has experience with it

D.It is exempt from installation instructions

Explanation: Listed and labeled products have been evaluated against a recognized standard or listing program for the intended application. The listing does not make the product universal; it must still be installed within its listing and the manufacturer's instructions.

6When should drainage and water piping that will be concealed generally be inspected and tested?

A.After walls are finished so leaks are easier to see

B.Before the piping is covered or concealed

C.Only after the building is occupied

D.Only if the owner requests a pressure test

Explanation: The code inspection process requires work to remain accessible for required inspections and tests before concealment. Covering uninspected piping can require removal of finish materials so the AHJ can verify compliance.

7What is the basic code purpose of prohibiting cross-connections between potable water and contaminated sources?

A.To protect the potable water supply from backflow contamination

B.To reduce the number of cleanouts required

C.To make hot water arrive faster at fixtures

D.To allow sanitary drains to be smaller

Explanation: Cross-connection control protects potable water from backpressure and backsiphonage hazards. The UPC uses air gaps, backflow assemblies, and other controls depending on the degree of hazard.

8A plumber bores through structural members for piping. What code principle controls the work?

A.Piping may be installed anywhere if the pipe is sloped correctly

B.Structural members must not be weakened beyond permitted limits, and protection plates or sleeves are used where required

C.Only gas piping needs protection from structural damage

D.The code allows notching without limits in nonbearing walls only

Explanation: General regulations require plumbing to be installed without impairing structural strength and with protection where piping passes through framing or is subject to damage. Slope and sizing do not excuse unsafe cutting or boring.

9How should a trench around buried plumbing piping be backfilled under UPC-style general regulations?

A.With clean material placed and compacted so the pipe is not damaged or displaced

B.With large rocks first so water can drain quickly

C.With construction debris if the pipe is plastic

D.Only with concrete, regardless of pipe material

Explanation: Backfill must protect piping from damage, settlement, and displacement. Clean bedding and backfill placed in controlled lifts prevent point loading and pipe deflection.

10In UPC terminology, where does the building drain generally become the building sewer?

A.At the outlet of the first fixture trap

B.At the point where the drainage piping exits the building and reaches the defined distance outside the building wall

C.At the first vent connection

D.At the public main, regardless of distance from the building

Explanation: The building drain is the lowest piping inside the building that receives discharge and conveys it toward the building sewer. The building sewer begins downstream outside the building at the code-defined transition point and continues to the public sewer or private disposal system.

About the NBOPE Journeyperson Plumber Exam

The NBOPE Journeyperson Plumber certification exam tests applied knowledge of the current adopted Uniform Plumbing Code for journey-level plumbing work. The exam combines an open-book UPC section with a closed-book section covering installation standards, fixtures, water heaters, indirect wastes, traps and interceptors, sanitary drainage, vents, storm drainage drawings, water supply drawings, and fuel-gas drawings.

Assessment

Two parts: 50-question open-book UPC section, then 100-question closed-book section

Time Limit

4 hours total (2 hours per part)

Passing Score

75% / 113 cumulative points

Exam Fee

$250 base test fee; $340 total at Prometric test centers (NBOPE c/o NITC)

NBOPE Journeyperson Plumber Exam Content Outline

20%

Installation Standards, Administration, Definitions, and General Regulations

AHJ authority, permits, inspections, code definitions, alternate materials, approved listings, pipe support, protection, trenching, testing, and plan-reading fundamentals.

17.33%

Fixtures and Fixture Fittings, Water Heaters, Indirect Wastes, and Traps and Interceptors

Fixture layout and schedules, water heater relief and expansion controls, garage installation rules, indirect waste receptors, air gaps, trap seals, prohibited traps, and grease interceptors.

39.33%

Sanitary Drainage, Vents, and Storm Drainage Related Drawings

DFU totals, drain slope, fittings, cleanouts, backwater protection, trap-arm distances, vent terminals, wet and circuit venting, island vents, storm drain sizing, overflow drains, and roof-plan takeoffs.

10.67%

Water Supply and Related Drawings

WSFU demand, water service sizing, pressure-reducing valves, air gaps, backflow assembly selection, water hammer arrestors, recirculation, developed length, and riser-diagram pressure loss.

12.67%

Fuel Gas and Related Drawings

NFPA 54 fuel-gas concepts, CFH conversions, longest-length sizing, downstream load totals, appliance shutoffs, sediment traps, gas pressure tests, CSST bonding, prohibited locations, and manifold pressures.

How to Pass the NBOPE Journeyperson Plumber Exam

What You Need to Know

Passing score: 75% / 113 cumulative points
Assessment: Two parts: 50-question open-book UPC section, then 100-question closed-book section
Time limit: 4 hours total (2 hours per part)
Exam fee: $250 base test fee; $340 total at Prometric test centers

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

NBOPE Journeyperson Plumber Study Tips from Top Performers

1Treat the 50-question open-book section as a navigation test: tab UPC definitions, fixture tables, drainage sizing, venting, storm drainage, water supply, and fuel-gas chapters.

2Memorize high-frequency closed-book values such as 1/4 inch per foot slope for small drains, 1/8 inch per foot for larger drains, 2-4 inch trap seal depth, 24 inch tailpiece limit, and 80 psi pressure-reducing valve trigger.

3Practice drawing takeoffs by segment: downstream DFU and CFH loads are cumulative, while storm drains use tributary roof area and rainfall.

4Drill venting as a system, not as isolated facts: trap-arm distance, dry vent rise, vent terminal clearances, wet venting, common venting, circuit venting, and island vent details connect together.

5For gas problems, convert BTU/hr to CFH first, identify the most remote outlet, then size each pipe section by downstream load using the selected table method.

6For water supply problems, write out static pressure, elevation loss, required residual pressure, developed length, and WSFU demand before choosing pipe sizes.

7Review official NBOPE test-day rules before the appointment because unauthorized notes, illustrated books, electronics, and nonapproved materials can invalidate an attempt.

Frequently Asked Questions

How many questions are on the NBOPE Journeyperson Plumber exam?

The official NBOPE/NITC materials describe a two-part exam with 150 total multiple-choice questions: 50 open-book questions followed by 100 closed-book questions.

How much time is allowed for the NBOPE Journeyperson Plumber exam?

Each part has a two-hour time limit. The full exam time is four hours, with a short break between the open-book and closed-book sections.

What score is needed to pass?

Candidates must score at least 75%, described by NBOPE/NITC as 113 cumulative points on the 150-question exam.

Is the exam open book?

Only the first part is open book. The first section has 50 multiple-choice UPC questions, and the second section has 100 closed-book multiple-choice questions.

Which UPC edition is used?

The current NBOPE/NITC 2026 materials reference the 2024 Uniform Plumbing Code for the current exam version. Candidates should follow their admission instructions and bring the required UPC edition on test day.

What are the journeyperson eligibility requirements?

NBOPE lists four years in a state registered, accredited apprenticeship or 8,000 hours of substantiated plumbing trade experience, documented with the official affidavit of experience.

How much does the exam cost?

The 2026 NBOPE/NITC application and bulletin list a $250 test fee. A Prometric test center appointment adds $90, for a $340 total at Prometric.

What content area is most heavily weighted?

Sanitary Drainage, Vents, and Storm Drainage Related Drawings is the largest journeyperson content area at 39.33% in the current candidate bulletin.