California licenses plumbing at the contractor tier only, through the Contractors State License Board. The credential is the C-36 Plumbing classification — a Class C specialty contractor license — held through a qualifier who documents four years of journey-level experience and passes the C-36 trade examination at a PSI center, closed book, in 3½ hours. The PassProfessor California C-36 Plumbing Contractor program prepares candidates for that trade examination and for the 2025 California Plumbing Code it is tested on.
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What this credential certifies
Start with what California does not have. California has no Master Plumber license, and it has no Journeyman Plumber license; neither credential exists in California law, and no examination for either exists. Plumbing here is licensed at the contractor tier only, and the top of that system is a classification, not a rung on an individual ladder: the C-36 Plumbing classification, a Class C specialty contractor license issued by the Contractors State License Board (CSLB), in the Department of Consumer Affairs. Its authority sits at Business and Professions Code sections 7008 and 7059, and the classification is defined at California Code of Regulations, title 16, section 832.36.
“Journeyman” survives in California as an experience level, not a credential. A journeyperson is an experienced worker — not a trainee — who is fully qualified to perform the trade without supervision, or a person who has completed an apprenticeship program. That level matters because the C-36 license is issued through a qualifier system: every classification on every CSLB license requires a qualifier, the person listed in CSLB records who meets the experience and examination requirements for that classification, qualifying a sole owner, a partnership, a corporation, or a limited liability company depending on the license’s form.
The scope the classification carries is broad. Under title 16, section 832.36, a plumbing contractor provides a means for a supply of safe water, ample in volume and of suitable temperature for the purpose intended, and the proper disposal of fluid waste from the premises, in all structures and fixed works — including complete removal of waste and on-site waste disposal systems. The classification reaches piping, storage tanks, and venting for gases and liquids for any purpose, including vacuum, compressed air, and medical, dental, commercial, and industrial gases; all gas appliances, flues, and gas connections, including suspended space heating units but not forced warm-air units; water and gas piping from the property owner’s side of the utility meter to the structure; equipment to heat water or fluids, including solar equipment; and maintenance and replacement of the above, with health and safety devices such as backflow preventers and regulating valves. California also sets a combined labor-and-materials value threshold above which a project must be performed by a licensed contractor — and where the work requires a permit or uses workers, a license is required regardless of project cost.
The examination at a glance
| Item | Verified position |
|---|---|
| Program | California C-36 Plumbing Contractor: the C-36 trade examination for the Class C specialty contractor license (C-36 Plumbing) |
| Regulator | Contractors State License Board (CSLB), Department of Consumer Affairs |
| Examination vendor | PSI — all CSLB examinations are administered by PSI at PSI computer centers |
| Examination structure | Two separate required examinations: the C-36 trade examination and the Law and Business Examination, each a separate fee and a separate sitting; trade examination 3½ hours, closed book, calculator provided |
| Passing standard | CSLB publishes no fixed percentage; the percentage needed to pass varies for each exam |
| Tested code | 2025 California Plumbing Code (2024 Uniform Plumbing Code base with California amendments), Title 24, Part 5 — for examinations on or after March 1, 2025 |
| Examination fee | $51.43 per examination registration, first attempt or repeat |
| Administrator note | PassProfessor is independent and is not affiliated with the Contractors State License Board |
Two examinations, two sittings — never one
Qualifying for a C-36 license requires two separate examinations, and this program covers one of them. The first is the C-36 trade examination, the subject of this page. The second is the Law and Business Examination. Each carries its own fee and is taken as its own sitting; the two may be scheduled on the same day or at different times, at the candidate’s preference. They are never blended into a single sitting. This page states the Law and Business requirement structurally and stops there: no Law and Business content is carried in this program.
The trade examination: 3½ hours, closed book, no count published
The C-36 trade examination is administered by PSI, in person at PSI computer centers — 20 in California, with trade examinations taken only in California or in Oregon, at Wilsonville. A Spanish version is available — one of ten CSLB examinations with one — and candidates requesting a translator for C-36 must take the Spanish version.
The sitting runs 3½ hours, closed book: no reference materials may be used. The format is multiple-choice with four choices per question and only one best answer; some questions require mathematical computation; there is no penalty for guessing. A calculator is provided, and personal calculators are prohibited. CSLB publishes no fixed item count for this examination, and this page prints none — any source giving the C-36 trade examination a definite number of questions is giving a number CSLB has not published.
Results are given as a printed report before the candidate leaves the center. A passing report shows no score, and a pass report is not a license. A failing report shows the overall score and a breakdown by section — the candidate’s map for the retake. And there is no practical: as published in the study guide, the examinations FAQ, and the PSI information guide, the trade examination is a computer-based multiple-choice examination only, with no hands-on or drawing component.
Tested and adopted: the examination moved first
The tested code and the adopted code in California are the same book on different clocks, and the dates are the delta. For examinations scheduled on or after March 1, 2025, the C-36 study guide’s reference list is built on the 2025 California Plumbing Code — the 2024 Uniform Plumbing Code adopted by reference with California amendments, published as Title 24, Part 5. The adopted layer runs later: the 2025 California Plumbing Code takes effect statewide on January 1, 2026, under the triennial Title 24 cycle, applying when a building-permit application is submitted. The examination therefore moved to the 2025 code on March 1, 2025, before the adopted code’s January 1, 2026 effective date. Candidates are tested on the examination edition: composition follows the study guide, not the permit effective date.
The study guide’s reference list reaches beyond the plumbing code: the 2025 California Mechanical Code, the 2025 California Building Code, and the 2025 California Green Building Standards Code (all Title 24); the Cal/OSHA safety orders (Title 8, 2024); the California Manual on Uniform Traffic Control Devices (2014, Revision 8); and the Underground Service Alert guidelines. The companion guide lists the full set.
California amendments carry a discipline candidates must learn with the code: they are adopting-agency amendments, identified by banner. Building Standards Commission amendments apply to state buildings and University of California and California State University buildings; Housing and Community Development amendments apply to residential occupancies; the health-facilities agency’s amendments apply to health facilities. The same section can carry different amendments for different occupancies, and a banner-limited amendment must never be studied — or stated — as a statewide rule.
What the trade examination covers
CSLB publishes its content outline with weights, stated as approximate. The C-36 trade examination divides as follows: Planning and Estimating, 22%; Underground and Rough Systems, 22%; Finish Plumbing Installations, 20%; Service, Repair, and Remodel Plumbing Systems, 19%; and Safety, 17%.
The published subtopics give each weight its content. Planning and Estimating covers scope of work and code compliance; pipe sizing and venting; shop drawings, plans, and specifications; job site inspections; coordination of projects; water conservation; and cost estimation for materials, equipment, labor, and overhead. Underground and Rough Systems covers excavation and underground installations; piping layout and installation; fuel gas piping; and insulation and system testing. Finish Plumbing Installations covers fixtures and appliances; water heaters; shut-off valves; specialty installations; and industrial and commercial piping and sanitary systems. Service, Repair, and Remodel covers troubleshooting; isolating leaks and damage; repairs; retrofitting; and disposal of plumbing materials. Safety covers personnel safety, job site safety, and environmental safety.
The qualifier route: four journey-level years in ten
There is no ladder of California plumbing licenses to climb, because there are no others. The route runs through experience, documented and verified. The qualifier must be at least 18 years old, must directly supervise and control the construction operations conducted under the license, and must hold at least four years of journey-level work experience in the C-36 classification within the ten years immediately before filing — credited only for experience as a journeyperson, foreperson, supervising employee, or contractor, and verified by someone other than the applicant who observed the work, on CSLB’s Certification of Work Experience form.
Education, technical training, or a completed apprenticeship may be credited toward the requirement, case by case — with no credit for high-school coursework — but every qualifier must still show at least one year of practical journey-level work experience, and there are no specific educational or course requirements for the license itself. Who may serve as qualifier depends on the license’s form: a sole owner or a responsible managing employee for a sole-ownership license; a general partner or a responsible managing employee for a partnership; a current officer — the responsible managing officer — or a responsible managing employee for a corporation; a responsible managing member or manager, officer, or employee for a limited liability company. A responsible managing employee must be a bona fide, permanently employed employee, actively engaged at least 32 hours per week or 80% of the firm’s total operating hours per week, whichever is less, and may not be qualifier on any other active license. One person may qualify more than one active license only under CSLB’s common-ownership and related conditions — never for more than three firms in a year — and an applicant may apply for only one classification at a time.
Two boundary rules complete the route. The trade examination may be waived where the person is currently the qualifier for a license in good standing in the same classification, was such a qualifier within the past five years, or passed both examinations in the same classification within the last five years — but waiver claimants must still document the four years in ten. And California does not recognise contractor licenses issued by other states or countries: reciprocity, where it exists at all, is case by case and at most supports a trade-examination waiver, with the Law and Business Examination and experience certification still required. Before a license can issue, every applicant must also be fingerprinted and must take CSLB’s asbestos open-book examination, on CSLB’s website. Passing the examinations alone does not issue the license.
Fees and retakes
One dollar figure is published for this credential in the sources behind this program: $51.43 per examination registration, for a first attempt or a repeat, not refundable and not transferable. No other CSLB dollar is printed in this package; none is carried in its sources.
The retake machinery is generous in attempts and strict in calendar. A candidate who fails may retake after 21 calendar days, as many times as necessary within the application’s window, with the fee paid to PSI for each attempt. The window is firm: the required examinations must be taken and passed within 18 months after the application is accepted and posted; after 18 months the application is void and a further application, with further fees, is required. Cancellation discipline matches: an appointment may be cancelled or rescheduled without forfeiting the fee only if notice reaches PSI two days — 48 hours — ahead, via the PSI website or by speaking with a PSI representative; voicemail and email are not acceptable cancellation. A missed appointment, a late arrival, or arriving without valid government photo identification forfeits the fee.
What the PassProfessor program will cover
The PassProfessor California C-36 Plumbing Contractor program is built on this credential’s defining structures. The 2025 code, on the examination’s clock: material keyed to the 2025 California Plumbing Code as the study guide lists it for examinations on or after March 1, 2025, with the banner discipline taught alongside. The published outline, weighted as published: planning and estimating, underground and rough systems, finish installations, service and repair, and safety, in the proportions CSLB prints. The qualifier route as examined knowledge: the four-years-in-ten rule, its verification, the qualifier forms for each business structure, and the waiver and reciprocity boundaries. The companion guide at /california-master-plumber-exam-guide/ works through the code timing, the outline, and the qualifier system in full.
Independence, stated plainly. PassProfessor is an independent preparation provider, not affiliated with the Contractors State License Board or with PSI. Completing it confers no license and no exemption; CSLB alone licenses, and candidates register for examinations through CSLB’s and PSI’s channels.
Tell me when enrollment opens. The California C-36 Plumbing Contractor program is in the works and enrollment is not yet open. Our catalog now includes preparation across the plumbing family, and this program joins it when it meets the standard described above. Leave an email address and PassProfessor will write to you when the program is ready — and only about this program. No date is promised.
Frequently asked questions
Does California have a Master Plumber or Journeyman Plumber license?
No. Neither license exists in California. “Journeyman” here is an experience level — an experienced worker fully qualified to perform the trade without supervision — not a credential CSLB issues.
How long is the C-36 trade examination, and is it open book?
The sitting is 3½ hours and closed book — no reference materials may be used. A calculator is provided; personal calculators are prohibited. The format is multiple-choice, four choices per question, one best answer, no penalty for guessing.
What score passes the C-36 trade examination?
CSLB publishes no fixed passing percentage: the percentage needed to pass varies for each exam, and applicants may inquire of CSLB. A passing report shows no score; a failing report shows the overall score and a breakdown by section.
What experience must the qualifier document?
At least four years of journey-level work experience in the C-36 classification within the ten years immediately before filing, credited only for work as a journeyperson, foreperson, supervising employee, or contractor, and verified by someone other than the applicant who observed the work. At least one year of practical journey-level experience is required of every qualifier.
What does the examination cost?
The PSI examination registration fee is $51.43 per examination, for a first attempt or a repeat. It is the only dollar figure printed for this credential in this package.
What happens after a failed attempt?
A retake is available after 21 calendar days, as many times as necessary within the application’s 18-month window, with the fee paid for each attempt. A candidate who has passed one of the two required examinations retakes only the failed one — results are good for five years.