NM Journeyman Plumber study guide
NM Journeyman Plumber · Work through your exam, one topic at a time.
The New Mexico Journeyman Plumber credential is a state-issued license that lets you perform plumbing work in New Mexico under the scope defined by the state plumbing code and the regulating authority, typically while working for or alongside a licensed contractor. It is the step between apprentice and master: you need documented field experience to qualify, and the exam is the knowledge check that confirms you can work unsupervised without creating health, safety, or code problems. The NM Journeyman Plumber study guide has 11 sections and about 3,254 words.
01General Plumbing Knowledge and Definitions
The General Plumbing Knowledge and Definitions domain tests precise code vocabulary: what makes up a plumbing system, who is the authority having jurisdiction (AHJ), and how terms such as stack, branch, riser, trap, and fixture unit change later sizing and inspection decisions. Definition questions often turn on what a pipe carries or its orientation, not on size alone.
327 words, about 2 min02Plumbing Math, Sizing, and Calculations
Plumbing Math, Sizing, and Calculations tests your ability to convert code tables and field measurements into correct pipe sizes, slopes, and pressures. Most exam errors come from using the wrong length-measured versus developed-or from mixing inches and feet.
289 words, about 1 min03Fixtures, Faucets, and Fixture Fittings
Fixtures, Faucets, and Fixture Fittings covers the appliance side of plumbing: fixture selection, trap size, flow rates, backflow protection, and the connections that join fixtures to the drainage and water systems. The exam tests whether a fixture can be installed as shown and whether its trap and drain are legal.
291 words, about 1 min04Water Supply and Distribution Systems
Water Supply and Distribution Systems tests pressure, pipe sizing, backflow protection, and the components that keep potable water separated from contaminants. Questions often ask what device is required at a given cross-connection or what happens to pressure at an elevation change.
296 words, about 1 min05Drain, Waste, and Vent Systems
Drain, Waste, and Vent Systems is the largest technical area: slope, fixture units, trap arms, venting, cleanouts, and the separations that keep sewage gas out of buildings. The exam tests whether a drain can carry its load and whether every trap has a compliant vent.
326 words, about 2 min06Traps, Interceptors, and Special Waste
Traps, Interceptors, and Special Waste covers the devices that protect the drainage system from sewer gas, grease, oil, sand, and chemical waste. The exam tests trap seal integrity and whether a special waste needs pretreatment before it enters the sanitary drain.
289 words, about 1 min07Storm Drainage and Subsoil Drainage
Storm Drainage and Subsoil Drainage tests roof runoff, leaders, area drains, subsoil drains, and sump pumps. The key skill is separating storm water from sanitary sewage and sizing drainage for the local rainfall rate.
288 words, about 1 min08Water Heaters and Hot Water Systems
Water Heaters and Hot Water Systems covers storage and instantaneous heaters, relief protection, expansion, venting, and distribution. The exam tests whether a heater is protected from over-temperature and over-pressure and whether its discharge is safe.
265 words, about 1 min09Fuel Gas Piping and Gas-Fired Appliances
Fuel Gas Piping and Gas-Fired Appliances tests gas pipe sizing, sediment traps, shutoffs, connectors, and appliance connections. The exam checks whether the piping can deliver the connected load at the available pressure and whether the appliance is protected and accessible.
274 words, about 1 min10Safety, Ventilation, and Combustion Air
Safety, Ventilation, and Combustion Air tests the air side of gas appliances: how much air an appliance needs, how venting works, and how to prevent carbon monoxide and backdrafting. The exam expects you to compute combustion air openings and recognize unsafe venting.
302 words, about 2 min11New Mexico Plumbing Code, Permits, and Inspection
New Mexico Plumbing Code, Permits, and Inspection tests the administrative side: which code edition applies, when a permit is required, who may perform work, and what inspections must occur. These questions are easy to miss because they are not about pipe sizing.
307 words, about 2 min