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Journeyman Plumber skills: what to learn first, and what can wait

Once you hold a journeyman card, the question stops being whether you can plumb and becomes what kind of jobs you can be trusted with alone. The skills below are in the order most shops care about them. Start at the top and don't skip ahead just because the later ones pay better.

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Step one

Gets you the interview

Venting and trap arm rulesA lot of failed rough-in inspections come back to venting. Know the difference between an individual vent, a wet vent and a circuit vent, and how far a trap can sit from its vent for common pipe sizes.

Joining every common pipe materialSoldering copper, press fittings, PEX crimp and expansion, PVC and CPVC solvent welding, and no-hub couplings on cast iron. A shop wants someone who can walk into an old house and work with whatever's there.

Water heater installs to codeTank and tankless installs are bread-and-butter service work. That means venting, relief valve discharge, expansion tanks, drain pans and gas or electrical connections that pass inspection.

Drain cleaning machinesRunning a sectional machine and a drum machine without tearing up a customer's fixtures, and knowing which cutter to use, gets you on a service truck quickly.

Step two

Gets you the offer

Sewer camera inspection and locatingBeing able to run a camera, read what you're seeing, and mark the spot with a locator turns a clog into an honest repair recommendation. Service managers love techs who can explain the footage.

Gas pipe sizing and pressure testingWhere your license allows gas work, sizing from the code tables and testing with a gauge sets you apart. It's also the work shops are most careful about handing out.

Leak detection without tearing out wallsUsing pressure tests, isolation, moisture meters and listening gear to find a slab or wall leak saves the customer money and the shop a messy callback.

Pricing from a flat-rate bookMany service shops quote from a price book on a tablet. Explaining options clearly and honestly is the difference between a closed ticket and a lost one.

Step three

Gets you promoted

Reading plan sets and isometric drawingsForemen lay out whole buildings from the plumbing sheets. Practice picking out fixture schedules, riser diagrams and invert elevations.

Material takeoffs and orderingCounting fittings and pipe off a drawing so a crew isn't waiting on the supply house is a skill most journeymen never learn. It's the first thing a lead does differently.

Backflow testing and cross-connection controlCertified testers can take on annual test contracts for commercial buildings and irrigation systems, which gives a shop steady work between emergencies.

Commercial systems like grease interceptors and booster pumpsCommercial work pays off for journeymen who want to move up, and it's where masters and foremen spend a lot of their time.

Certificates worth your time

Certificate	Best for	Effort	Worth it?
State journeyman plumber license	Anyone working in a state or city that licenses plumbers	the full apprenticeship, then weeks of code study before the exam	This is the job itself in licensed areas. Nothing else on this list matters without it.
Backflow prevention assembly tester certification	Journeymen who want commercial or testing work	about a week of class plus a hands-on test	Worth it. It opens steady testing work and many shops will pay for the course.
ASSE 6010 Medical Gas Installer	Plumbers working on hospitals, clinics and dental offices	a short course and exam, after you meet the experience requirement	Worth it if there's healthcare construction near you. Otherwise it's hard to use.
OSHA 10-Hour Construction	Journeymen on commercial or union job sites	a couple of days, often online	Cheap and often required on commercial sites. Get it early.

Licensing and certification rules vary by state and water authority, so check with your state plumbing board or the course provider before you sign up.

Put it on your résumé like this

Weak

Did plumbing installs and repairs for residential customers.

Strong

Ran 6 to 8 service calls a day as a licensed journeyman, including 40+ water heater installs and sewer camera inspections, with 2 callbacks in 12 months.

Questions people ask

What should a new journeyman plumber learn first?

Venting and the code book your area uses. A lot of inspection failures and callbacks come from venting, slope and trap arm mistakes, and a journeyman is expected to catch those without someone checking behind them.

Do I need to know gas piping as a journeyman?

It depends on your state. Some states include gas in the plumbing license, others license it separately. Check your board, and if your license covers it, learn sizing and testing well, since shops trust gas work to few people.

Is backflow tester certification worth it?

For most journeymen, yes. It's a short course, many water authorities require certified testers, and it gives you work that isn't tied to emergencies.

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