NITC Journey Level Plumber study guide
NITC Journey Level Plumber · Work through your exam, one topic at a time.
The NITC Journey Level Plumber credential is a trade certification for plumbers who have completed their apprenticeship or accumulated equivalent field experience and want independent verification of journeyman-level competence. It is used by working plumbers, contractors screening hires, and jurisdictions or employers that recognize third-party certification as evidence of skill. The NITC Journey Level Plumber study guide has 8 sections and about 3,187 words.
01General Plumbing Knowledge and Safety
This domain checks whether you can work safely and understand the principles behind a plumbing system, not just assemble parts. Expect questions on excavation, confined spaces, hot work, gas and electrical hazards, material handling, and the basic logic of plumbing: fixtures need traps, traps need vents, drains rely on gravity, and potable water must be protected from contamination.
387 words, about 2 min02Piping, Fittings, and Pipe Joining
This domain covers material selection and the joining methods that make a system reliable: copper, PVC, CPVC, ABS, PEX, galvanized steel, cast iron, and the fittings that connect them. You should know which joining method belongs to which material, what makes a joint fail, and how to protect dissimilar metals.
383 words, about 2 min03Fixtures, Faucets, and Appliances
This domain tests installation and connection details for water closets, lavatories, sinks, showers, dishwashers, washing machines, and water heaters. Expect questions on flow rates, trap sizes, rough-in dimensions, accessible installation, and safe appliance connections.
413 words, about 2 min04Drain, Waste, and Vent Systems
This domain tests gravity drainage and venting: slope, fixture units, trap arms, vents, stacks, building drains, cleanouts, and testing. The central idea is that every fixture trap must keep its seal, and every trap must be vented so water flow does not siphon the seal.
450 words, about 2 min05Water Supply and Distribution Systems
This domain tests pressure, sizing, backflow protection, hot-water distribution, and the causes of poor flow. You should be able to convert pressure to elevation, recognize the devices that protect potable water, and explain why a closed system needs expansion control.
385 words, about 2 min06Plumbing Math, Plans, and Isometric Drawings
This domain tests practical plumbing math and drawing interpretation: scale, offsets, slope, volume, and isometric layouts. You should be able to read a plan, convert scale to real dimensions, calculate a 45-degree offset, and find pipe volume or fall without mixing units.
388 words, about 2 min07Code, Installation, and Inspection Standards
This domain tests whether you know how code requirements become an inspection: permits, rough-in and final inspections, testing, support, protection of piping, clearances, and firestopping. The adopted code is the minimum, and local amendments commonly add requirements.
379 words, about 2 min08Maintenance, Repair, and Troubleshooting
This domain tests diagnosis before repair. Expect questions on slow or blocked drains, leaks, low pressure, running toilets, water-hammer noise, frozen pipes, water-heater problems, and backflow testing.
402 words, about 2 min