Hawaii’s journeyman plumber credential is designated PJ, with PM as the master plumber credential above it. Journeyman candidates are examined by PSI on the 2018 Uniform Plumbing Code, and in Hawaii the edition tested is the edition adopted — the code a candidate studies for the examination is the code in force for the work. The PassProfessor Hawaii Journeyman Plumber program prepares candidates for that PJ examination.
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What this credential certifies
The PJ is Hawaii’s journeyman plumber credential. It is the license of the working plumber who has completed the apprenticeship stage of the trade and now works at journeyman level — installing, altering, and repairing plumbing systems under the 2018 Uniform Plumbing Code as adopted in Hawaii. Above it sits one further examined step, the PM, Hawaii’s master plumber credential. The two designations are short, and candidates should learn to read them exactly: PJ is the journeyman credential this page is about, and PM is the ladder step beyond it, not an alternative name for the same license.
That two-step ladder matters for how a candidate plans. The journeyman examination is not a contractor examination, and it is not an entry permit for apprentices. It certifies that the holder can be trusted with journeyman work itself: reading a system against the code, sizing and routing pipe correctly, protecting potable water, venting drainage so traps hold their seals, and recognising the point at which a field condition has moved outside what the code permits. A candidate preparing for the PJ should therefore study as a practitioner, not as a student collecting definitions — the examination, built on the Uniform Plumbing Code, rewards people who can apply its provisions to systems that resemble real work in Hawaii buildings.
One boundary deserves stating at the outset, because Hawaii candidates regularly cross it in their searching. The C-37 contractor examination is a different credential. It belongs to the contractor licensing route, which concerns operating a contracting business, and it is not the journeyman plumber examination. Material written for the C-37, and preparation aimed at contractor candidates, does not prepare a candidate for the PJ sitting. This program is built for the PJ alone.
The examination at a glance
| Item | Verified position |
|---|---|
| Program | Hawaii Journeyman Plumber: the PJ journeyman credential |
| Credential designations | PJ = Journeyman Plumber; PM = Master Plumber |
| Examination vendor | PSI, under its Plumber Examinations bulletin for Hawaii |
| Code examined | Uniform Plumbing Code, 2018 edition (UPC 2018) |
| Tested versus adopted | Tested = adopted: Hawaii examines on the 2018 UPC, the edition adopted in Hawaii |
| Not this credential | The C-37 contractor examination is a separate credential and a separate route |
| Companion guide | /hawaii-journeyman-plumber-exam-guide/ |
| Administrator note | PassProfessor is independent and is not affiliated with PSI or with Hawaii’s plumbing licensing authority |
No passing score, question count, time limit, book status, or examination fee is printed in this package. Those figures are not carried in the verified source record used for this page, and candidates should take them from PSI’s current Hawaii Plumber Examinations bulletin and from Hawaii’s licensing authority at the time they are approved to schedule — not from secondary summaries, which in plumbing are frequently copied from other states and other editions.
Why the tested-equals-adopted position matters in Hawaii
Many states examine journeyman candidates on an older code edition than the one currently adopted for construction, and candidates in those states must keep two editions apart in their heads. Hawaii is not one of them. Here, the 2018 Uniform Plumbing Code is both the adopted code and the examined code. That alignment is the single most useful structural fact a Hawaii candidate can hold.
It changes the study task in three practical ways. First, there is no edition translation to perform: a provision learned for the examination is the provision that governs the installation, so time that candidates elsewhere spend learning which edition a rule belongs to can be spent in Hawaii on depth — on understanding why a provision is written as it is. Second, field experience and examination study reinforce each other directly. Work a Hawaii apprentice has done under the 2018 UPC is examination-relevant in the same form in which it was done, and code questions met in study can be checked against systems the candidate has actually installed. Third, the trap that catches candidates in edition-gap states — answering from the newer adopted code when the examination keys to the older one, or the reverse — simply does not exist here. Hawaii candidates should still be careful with study material written for other states or for other UPC editions, because a correct rule from the 2021 or 2024 UPC, or from a state that amends heavily, may not be the 2018 Hawaii answer.
What the PJ examination covers
The examination is built on the 2018 Uniform Plumbing Code, and its content follows the work that code governs. Candidates should expect their preparation to be organised around the systems a Hawaii journeyman actually builds and services, read through the 2018 UPC’s provisions rather than through any other edition or any other model code.
Drainage, waste, and vent systems — the core of journeyman work: drainage fixture units, sizing of drains and vents, trap protection, cleanout access, slopes, and the venting arrangements that keep a drainage system breathing so trap seals survive. This is the area where code reasoning is most visible, because a venting error rarely shows on the day of installation and reliably shows in service.
Water supply and distribution — sizing supply piping, pressures, backflow protection, cross-connection control, and the protection of potable water throughout a building. In Hawaii, where buildings range from single-family homes to high-rise hotels and hospitals, supply sizing and backflow judgement are daily journeyman decisions, not examination abstractions.
Fixtures and fixture fittings — the code requirements for the fixtures themselves, their installation, clearances, and connections, and the difference between a fixture that merely fits the space and one that complies.
Water heaters and fuel gas piping — installation, venting, temperature and pressure protection, and the gas piping provisions that sit alongside the plumbing work a journeyman is called on to perform safely.
Indirect waste, special wastes, and interceptors — the less frequent, more heavily examined corners of the code, where commercial kitchens, laboratories, and similar occupancies impose requirements a residential-only background may never have encountered.
General code administration and materials — approved materials, joints and connections, workmanship standards, and the general provisions that frame every specific rule: what may be installed, how it may be joined, and what an inspector will accept.
The Hawaii layer: what makes this a Hawaii examination
Strip away the code content, which Hawaii shares with every other UPC jurisdiction, and three Hawaii facts remain — and they are the facts generic preparation most often gets wrong. The first is the designation itself: candidates searching under a generic “journeyman plumber license” label can miss that Hawaii names this credential PJ, and that official examination material is organised under that designation and under PSI’s Hawaii Plumber Examinations bulletin. The second is the vendor: Hawaii journeyman examinations run through PSI, so approval, scheduling, and sitting arrangements follow PSI’s bulletin for this state, not the arrangements of a state examining board office or of another vendor used elsewhere. The third is the C-37 boundary already noted: Hawaii separates the journeyman credential from the contractor credential sharply, and a candidate who follows contractor-route guidance will study the wrong examination with great diligence.
Hawaii’s geography gives the code content a local weight as well. Plumbing work in the islands serves dense resort and high-rise construction, older housing stock, and commercial buildings exposed to a marine environment that is hard on materials and joints. None of that changes the 2018 UPC’s text, but it changes which parts of the journeyman’s judgement are exercised most — corrosion-aware material selection, backflow protection in complex commercial systems, and drainage and venting in multi-storey work. Preparation grounded in the code as Hawaii applies it will feel different from preparation written for a mainland state on a different code, and it should.
The ladder: PJ and PM
Hawaii’s plumbing ladder, for examination purposes, has two examined rungs. The PJ is the journeyman step: it is the credential of the fully trained working plumber. The PM is the master step above it, for plumbers who take on the master’s wider responsibility. Candidates should sit the examination for the rung they are entering. A journeyman candidate does not need master-level business or design material, and a candidate whose experience is still at apprentice level should confirm eligibility for the PJ with Hawaii’s licensing authority before building a study plan around a sitting date. The designations also matter after the examination: correspondence, applications, and examination records in Hawaii use PJ and PM, and using the right designation at each step avoids the administrative confusion that generic terminology creates.
The route, in order
The route runs in the order the system is built. Confirm that the PJ is the credential your work requires, and that the C-37 contractor route is not the one you actually need — or, if it is, that you understand it is a separate examination. Confirm your eligibility for the journeyman credential with Hawaii’s licensing authority. Follow the approval and scheduling process set out in PSI’s Hawaii Plumber Examinations bulletin, which is the operative document for this sitting. Prepare on the 2018 Uniform Plumbing Code — the adopted edition, and therefore the examined edition — including the drainage, venting, water supply, and protection provisions a journeyman uses daily. Sit the examination through PSI. Candidates who do not pass should follow the retake arrangements in the current PSI bulletin and in the licensing authority’s instructions, and should rebuild preparation around the areas the sitting exposed rather than repeating the same study unchanged.
What makes this examination demanding
The PJ examination is demanding in the way journeyman examinations generally are, sharpened by one Hawaii feature: because tested and adopted are the same edition, there is nowhere to hide behind edition confusion. The candidate is expected to know the 2018 UPC as a working document. Items that present a system — a vent arrangement, a supply layout, a fixture group — and ask what the code requires test whether the candidate can move from a drawing or a description to the governing provision, size or protect accordingly, and reject the answers that describe common field shortcuts. Shortcuts are the real distractors in a journeyman sitting: several options in any well-built item will describe work that gets done in the field, and only one will describe work the 2018 UPC permits.
The examination also spans the full width of the code rather than only its residential heartland. A candidate whose apprenticeship ran heavily to housing may meet commercial drainage, interceptors, and institutional backflow questions at a level their daily work never required. Breadth, built deliberately before the sitting, is the difference between a candidate who is excellent within one segment of the trade and a candidate the examination recognises as a journeyman across it.
What the PassProfessor program will cover
Built on the platform architecture: a Uniform Plumbing Code core plus a Hawaii delta. PassProfessor plumbing programs are composed in two layers. The first is the journeyman core written to the 2018 Uniform Plumbing Code — drainage and venting, water supply and backflow protection, fixtures, water heating and gas piping, and the general provisions that frame them. The second is the Hawaii delta: the PJ and PM designations and the ladder they form, PSI as the examination vendor and its Hawaii Plumber Examinations bulletin as the operative sitting document, the tested-equals-adopted position on the 2018 UPC, and the firm boundary between the PJ examination and the separate C-37 contractor examination. Every item is written from scratch against primary sources; no item is drawn from another provider’s material.
Code-application practice, not definition recall. Because the PJ sitting tests systems against provisions, the program trains that movement — description to provision, provision to answer — across the breadth of the 2018 UPC, with deliberate weight on the commercial and protection topics that narrow apprenticeships under-serve. For the full route, the sitting arrangements, and a study plan built around the 2018 code, read the companion guide at /hawaii-journeyman-plumber-exam-guide/.
Independence, stated plainly. PassProfessor is an independent preparation provider, not affiliated with PSI or with Hawaii’s plumbing licensing authority, and this program is not a Hawaii licensing course. Completing it confers no license and no exemption; the licensing authority alone licenses, and candidates register for examinations through PSI’s bulletin channels.
Tell me when enrollment opens. The Hawaii Journeyman Plumber program is in the works and enrollment is not yet open. Leave an email address and PassProfessor will write to you when the program is ready — and only about this program. No date is promised, because the program will open when it meets the standard described above, not before.
Frequently asked questions
What is the PJ in Hawaii plumbing?
PJ is Hawaii’s designation for the Journeyman Plumber credential. The master credential above it is designated PM.
What code is the Hawaii journeyman examination based on?
The 2018 Uniform Plumbing Code. Hawaii examines on the 2018 UPC, which is also the edition adopted in Hawaii — tested equals adopted, so there is no edition gap to manage.
Who administers the Hawaii journeyman plumber examination?
PSI, under its Plumber Examinations bulletin for Hawaii. Approval, scheduling, and sitting arrangements follow that bulletin.
Is the C-37 examination the same as the PJ examination?
No. The C-37 contractor examination is a different credential on the contractor licensing route. It is not the journeyman plumber examination, and C-37 preparation does not prepare a candidate for the PJ sitting.
Should I study the newest edition of the Uniform Plumbing Code?
Study the edition Hawaii examines on: the 2018 UPC. Provisions from later UPC editions, or from other model codes, may differ from the 2018 answer the Hawaii examination keys to.
Does field experience under the Hawaii code help?
Yes, directly. Because Hawaii tests the adopted 2018 UPC, work performed under that code is examination-relevant in the form in which it was performed — provided the candidate also builds the breadth beyond their own segment of the trade.
Is PassProfessor affiliated with PSI or with Hawaii’s licensing authority?
No. PassProfessor is an independent preparation provider. PSI administers the examination and the licensing authority alone licenses plumbers in Hawaii.
When does enrollment open?
The program is in the works and enrollment is not yet open. Leave an email address on this page and PassProfessor will write to you when the program is ready — and only about this program.