NITC Master Plumber study guide
NITC Master Plumber · Work through your exam, one topic at a time.
The NITC Master Plumber credential is a professional certification administered through the National Inspection, Testing and Certification Corporation (NITC), an ASSE International affiliate. It is designed for experienced plumbing professionals who already hold journeyman-level credentials or can document substantial field experience and who want independent verification that they can design, install, and supervise plumbing systems to code. The NITC Master Plumber study guide has 10 sections and about 3,645 words.
01Plumbing Systems Design and Layout
The Plumbing Systems Design and Layout domain tests whether you can take a set of fixture loads, a building section, and a set of code tables and produce a coordinated, code-compliant system. Questions mix drainage layout, water distribution layout, and the arithmetic that ties them together.
367 words, about 2 min02Water Supply and Distribution Systems
Water Supply and Distribution Systems covers pipe selection, jointing, pressure control, and the details that keep potable water potable. The exam's favorite scenario is what happens on the downstream side of a check valve.
339 words, about 2 min03Sanitary Drainage, Waste, and Venting
The Sanitary Drainage, Waste, and Venting domain is the heart of the master-level exam: slope, fixture units, trap protection, and vent geometry, often combined in one scenario. Minimum slope: 1/4 in/ft for 2-1/2 in and smaller, 1/8 in/ft for 3 in and larger, measured on the pipe, not the trench bottom.
414 words, about 2 min04Storm Drainage and Special Waste Systems
Storm Drainage and Special Waste Systems tests roof drainage hydraulics, secondary drainage, and the separate piping systems that must never meet the sanitary drain. Calculate storm flow from the horizontally projected roof area, including overhangs, and the local design rainfall intensity: GPM = 0.0104 x rainfall (in/hr) x area (ft2).
350 words, about 2 min05Fixtures, Faucets, and Fixture Fittings
Fixtures, Faucets, and Fixture Fittings covers the appliance end of the system: clearances, water efficiency, accessibility, and the fittings that connect a fixture to the drain. Water closet: centerline at least 15 in from a side wall, 30 in clear width, and 21 in clear in front of the bowl.
387 words, about 2 min06Water Heaters and Hot Water Systems
Water Heaters and Hot Water Systems tests sizing, temperature and pressure protection, venting, and the code details that keep a storage tank from becoming a hazard. Every storage water heater needs a temperature-and-pressure relief valve set no higher than 210 F and 150 psi, and no higher than the tank's rated working pressure.
349 words, about 2 min07Plumbing Code, Standards, and Permits
Plumbing Code, Standards, and Permits is the administrative domain: which document governs, who approves it, and what paperwork comes before and after the work. The adopted plumbing code, with state and local amendments, governs.
326 words, about 2 min08Backflow Prevention and Cross-Connection Control
Backflow Prevention and Cross-Connection Control is heavily tested because it is a public health function: the exam wants the hazard, the device, and the test. High hazard, meaning anything that could cause illness or death such as sewage, chemicals, antifreeze, or pesticides, requires an air gap or a reduced-pressure principle assembly (RPZ, ASSE 1013).
369 words, about 2 min09System Testing, Inspection, and Troubleshooting
System Testing, Inspection, and Troubleshooting asks you to prove the work and then diagnose failures from the symptom. DWV water test: fill to 10 ft of head above the highest point, hold 15 minutes, no drop.
375 words, about 2 min10Project Management, Estimating, and Safety
Project Management, Estimating, and Safety is the business side of the master license: the exam expects you to build a number and keep a crew safe. Take off by system: fixtures, pipe by size and material, fittings as a percentage of pipe cost (commonly 5-10%), hangers, valves, insulation, excavation, and penetration firestopping.
369 words, about 2 min