100+ Free NCCER Plumbing Practice Questions
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What is the minimum slope for a horizontal drainage pipe 3 inches or smaller per IPC 704.1?
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Key Facts: NCCER Plumbing Exam
4 Levels
Curriculum Levels
NCCER Plumbing 5th Edition
702.5 Hours
Total Contact Hours
NCCER Plumbing 5th Edition curriculum
70%
Passing Score
NCCER Plumbing Level Test Specifications
3 Hours
Closed-Book Exam Time
NCCER Plumbing 5th Edition Level Test
$61,550
Median Annual Wage
BLS May 2023 (plumbers, pipefitters, steamfitters)
50 States
Credential Portability
NCCER Registry nationwide
NCCER Plumbing is a four-level curriculum totaling 702.5 contact hours aligned with DOL apprenticeship standards. The Bureau of Labor Statistics reports a median annual wage of $61,550 for plumbers, pipefitters, and steamfitters (May 2023), with 2% projected job growth through 2032. NCCER level tests are closed-book, 3-hour, 80-100 question assessments requiring 70% to pass and registered on the national NCCER credential registry recognized in all 50 states.
Sample NCCER Plumbing Practice Questions
Try these sample questions to test your NCCER Plumbing exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.
1Which type of personal protective equipment is required when soldering copper tube with a propane torch in a confined space?
2Per OSHA 1926 Subpart P, at what excavation depth must a protective system (sloping, shoring, or shielding) be installed in Type C soil?
3What does an SDS (Safety Data Sheet) Section 4 contain?
4When working with primer and PVC solvent cement, which OSHA-required practice protects against fume inhalation?
5Convert 3/4 inch to a decimal value (used in plumbing calculations).
6What is the travel length of a 45-degree offset when the offset distance (set) is 12 inches?
7On a plumbing drawing, what does the symbol consisting of a circle with a horizontal line through it (looking like a ground symbol) typically represent?
8Which type of plumbing drawing shows piping in three-dimensional perspective with no scale?
9A pipe wrench's jaws are designed to grip in which direction?
10What is the purpose of a basin wrench in plumbing work?
About the NCCER Plumbing Exam
The NCCER Plumbing credential validates the knowledge and skills needed to safely install, test, maintain, and repair residential, commercial, and public-building plumbing systems. The four-level curriculum (5th Edition, 702.5 total hours) aligns with U.S. Department of Labor apprenticeship standards and covers DWV systems, water supply, fixtures, water heaters, fuel gas, backflow prevention, and code compliance under both the UPC and IPC.
Assessment
Closed-book level test of approximately 80-100 multiple-choice questions covering one of four levels of the NCCER Plumbing 5th Edition curriculum; this practice bank covers all four levels.
Time Limit
3 hours
Passing Score
70%
Exam Fee
$80-$150 (varies by training provider) (NCCER (Accredited Assessment Centers))
NCCER Plumbing Exam Content Outline
Plumbing Safety
PPE, trenching (OSHA 1926 Subpart P, 5-foot protective system trigger), HazCom/SDS, LOTO, and confined-space rules.
Plumbing Math, Drawings, and Specifications
Fractions/decimals, offset constants (1.414/2.000/1.155/2.613), isometric drawings, plumbing symbols, and fixture schedules.
Tools of the Plumbing Trade
Pipe wrench, basin wrench, tubing cutter, reamer, threader, manometer, levels, and inspection equipment.
Pipe Materials and Joining
ASTM-standard plastic (D1785/D2665/D2661/F441/F876), copper (B88), cast iron (A74, CISPI 301/310), steel (A53), and NPT threading.
DWV Systems
Drain slope (1/4 in/ft min for 3 in and smaller), trap arms (8 ft for 2 in), DFUs, vent sizing (1-1/4 in min IPC), AAVs (ASSE 1051), and cleanouts (every 50 ft).
Water Supply Systems
Hunter's method/WSFU, minimum 8 psi at highest fixture, PRV required above 80 psi, water hammer arrestors (ASSE 1010), and dielectric unions at copper-to-steel.
Fixtures, Faucets, and Trims
1.6 gpf water closets (EPAct 1992), ADA heights (17-19 in), 110 F public lavatory limit (IPC 416.5), and faucet cartridge types.
Water Heaters
T&P valve discharge (IPC 504.6), anode rods, expansion tanks on closed systems, combustion air (1 sq in per 3,000 BTU/hr), and 18-in garage elevation.
Fuel Gas Systems
Black iron (ASTM A53), CSST, yellow PTFE tape, IFGC 410 shutoff within 6 ft, manometer testing, and 1,000 BTU/cf natural gas value.
Backflow Prevention
Air gap (2x effective opening), ASSE 1001 AVB (6 in above outlet), ASSE 1011 hose-bibb VB, ASSE 1013 RPZ for high hazard, ASSE 5110 tester certification.
Code Compliance (UPC/IPC)
Permit/inspection process, NSF/ANSI 61 potable-water listing, SDWA lead-free 0.25% rule, pipe-support spacing (IPC 308.5), and frost-depth burial.
How to Pass the NCCER Plumbing Exam
What You Need to Know
- Passing score: 70%
- Assessment: Closed-book level test of approximately 80-100 multiple-choice questions covering one of four levels of the NCCER Plumbing 5th Edition curriculum; this practice bank covers all four levels.
- Time limit: 3 hours
- Exam fee: $80-$150 (varies by training provider)
Keys to Passing
- Complete 500+ practice questions
- Score 80%+ consistently before scheduling
- Focus on highest-weighted sections
- Use our AI tutor for tough concepts
NCCER Plumbing Study Tips from Top Performers
Frequently Asked Questions
How many levels are in the NCCER Plumbing curriculum?
The NCCER Plumbing curriculum has four levels totaling approximately 702.5 contact hours in the 5th Edition. Level 1 has 12 modules (introduction, safety, tools, math, drawings, and pipe materials), Level 2 has 10 modules (water heaters, backflow, fuel gas), Level 3 has 9 modules (advanced sizing, venting), and Level 4 has 11 modules (project management and specialty topics). Each level concludes with a separate level test.
What is on the NCCER Plumbing level test?
Per the NCCER Plumbing 5th Edition Level 1 test specifications, each level test is a closed-book, three-hour, multiple-choice exam with approximately 80-100 items covering every module in that level. Level 1 has 100 items distributed across plumbing safety, tools, math, drawings, pipe materials, fixtures, DWV, and water distribution. Pass mark is 70%, and a basic non-printing calculator is permitted.
What is the difference between a plumber and a pipefitter?
Plumbers focus on water supply, drainage, and sanitary systems in residential, commercial, and public buildings — a separate NCCER craft certification. Pipefitters work primarily with industrial and process piping in refineries, chemical plants, and power generation, handling high-pressure and high-temperature systems under ASME B31.3. Both are recognized NCCER credentials with different test specifications and curricula.
Which plumbing code does the NCCER curriculum reference?
The NCCER 5th Edition Plumbing curriculum uses tables and data from both the Uniform Plumbing Code (UPC, published by IAPMO) and the International Plumbing Code (IPC, published by ICC). Testing material covers both codes because adoption varies by state — the UPC is dominant in the western US, the IPC in the eastern and midwestern US. Plumbers should know both for portable credentialing.
Do NCCER Plumbing credentials transfer between states?
Yes. All NCCER credentials are registered nationally in the NCCER Registry and recognized in all 50 states. Many state plumbing boards accept NCCER training hours toward journeyman license requirements, but each state also has its own licensing exam covering state-adopted codes. Always verify acceptance with the specific state plumbing board before relocating.
How long is the NCCER Plumbing apprenticeship?
A typical NCCER-aligned plumbing apprenticeship takes 4-5 years and combines roughly 6,000-8,000 hours of on-the-job training with about 800 hours of classroom instruction across the four levels. The program complies with U.S. Department of Labor registered apprenticeship standards. Apprentices earn progressive wage increases at each level and finish with both NCCER certification and DOL journey-level status.