Journeyman Plumber Exam (PSI) Practice Test
Build your confidence for Journeyman Plumber Exam (PSI). Practice the concepts, understand the answers, and strengthen your knowledge one question at a time.
Try a sample questionExam overview and details
The Journeyman Plumber Exam administered by PSI (Psychological Services, Inc.) is a comprehensive, state-recognized assessment designed to certify that a plumber possesses the advanced knowledge and practical skills required to work independently. This 82-question exam evaluates a candidate's mastery of plumbing codes, principles, and applications beyond the apprentice level. It is intended for experienced plumbing apprentices who have completed the required hours of on-the-job training and related classroom instruction, as mandated by their state or local licensing board. Successfully passing this exam grants the individual a Journeyman Plumber license, legally authorizing them to perform plumbing installations, repairs, and alterations without direct supervision, and is a critical step toward eventually becoming a Master Plumber. The credential validates professional competency, enhances career mobility, and is often required for employment with contractors, municipalities, or to operate one's own service business.
Sample Questions
Choose an answer and explore the explanation to see how practice works.
During rough-in at a four-unit townhouse project, the inspector stops at a marked wall bay. A condensate drain from HVAC equipment is tied into a lavatory tailpiece without a proper indirect arrangement. The crew has pressure-tested the line, but the inspection issue is about code arrangement rather than leakage. The general contractor notes that the finish selection has already been ordered. For a PSI Journeyworker Plumber item based on the 2021 IPC/IRC reference set, which decision is most defensible?
During rough-in at a four-unit townhouse project, a wet-vented bathroom group is revised after framing to add a kitchen sink on the same horizontal wet vent. The contractor argues the pipe is already oversized and the added sink is only a short branch away. The field note also mentions a future dishwasher, but that appliance is not shown on the permit plan. For a PSI Journeyworker Plumber item based on the 2021 IPC/IRC reference set, which decision is most defensible?
A journeyman is reviewing a permit set for a two-story clinic remodel. A reclaimed-water line is routed near potable piping in a mechanical room and the labels are missing at several offsets. The field condition is limited to one area, but accepting it would set the standard for the rest of the rough-in. The unrelated framing inspection passed earlier that day. For a PSI Journeyworker Plumber item based on the 2021 IPC/IRC reference set, which decision is most defensible?
During rough-in at a four-unit townhouse project, the inspector stops at a marked wall bay. A restaurant prep sink trap has a cleanout plug on the trap bend and the owner wants to keep an old S-trap because it drains quickly. The inspector has not failed the job yet, but the concealed work photo and the as-built note disagree. The general contractor notes that the finish selection has already been ordered. For a PSI Journeyworker Plumber item based on the 2021 IPC/IRC reference set, which decision is most defensible?
A journeyman on a replacement job must decide whether an existing condition can remain. A roof drain replacement uses a smaller outlet because the supplier had no matching size in stock. The owner asks for the fastest correction because drywall is scheduled the next morning. The installer points out that the piping is level and neatly supported. For a PSI Journeyworker Plumber item based on the 2021 IPC/IRC reference set, which decision is most defensible?
Career Opportunities & Salary
Exam insights and study advice
Earning a Journeyman license is not merely a bureaucratic hurdle; it is a public safety imperative. The exam ensures that licensed professionals have a proven, code-based understanding of how to install and maintain systems that protect potable water supplies and safely remove waste. This directly prevents cross-contamination, gas leaks, sewage backups, and structural damage, safeguarding community health and property. For the professional, it translates to higher earning potential, greater job responsibility, and the trust of employers and clients who rely on certified expertise for complex and legally compliant work.
Recommended
These are the backgrounds the certifying body suggests. Check the vendor's own page for anything it formally requires.