Free Practice Questions for CA Plumber
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Key Facts: CA Plumber Exam
Scaled scoring
Passing Score
Contractors State License Board (CSLB)
100
Questions
3.5 hours time limit
$450+
Exam Fee
PSI
CPC
Code Basis
California uses the California Plumbing Code (CPC), which is based on the UPC with extensive state amendments
California's journeyman plumber exam has approximately a 55% pass rate. The 100-question exam requires Scaled scoring to pass and is based on the CPC. California uses the California Plumbing Code (CPC), which is based on the UPC with extensive state amendments.
Sample CA Plumber Practice Questions
Try these sample questions to review concepts for the CA Plumber exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 298+ question experience with AI tutoring.
1Under the CPC as adopted in California, what is the minimum size drain pipe required for a water closet?
2According to the CPC as enforced in California, what is the minimum slope for a 4-inch horizontal drainage pipe?
3Under California's plumbing code, what is the DFU value for a residential lavatory?
4Per the CPC as adopted in California, what is the minimum depth of a fixture trap seal?
5According to the CPC as enforced in California, at what intervals must cleanouts be installed on horizontal drainage piping 4 inches and smaller?
6Under the CPC as adopted in California, what is the maximum number of DFUs that can be connected to a 3-inch horizontal branch?
7Per the CPC as enforced in California, what is the required slope for a 2-inch horizontal drainage pipe?
8According to the CPC as adopted in California, what is the minimum size building sewer when serving more than one water closet?
9Under the CPC as enforced in California, what is the maximum tailpiece length from a fixture outlet to the trap weir?
10Per the CPC as adopted in California, what is the DFU value for a residential bathtub with shower?
About the CA Plumber Exam
The California journeyman plumber exam is administered by PSI on behalf of the Contractors State License Board (CSLB). The C-36 Plumbing Contractor exam is closed-book and uses scaled scoring rather than a fixed percentage. It tests knowledge of the CPC, drainage systems, water supply, venting, gas piping, and California-specific amendments.
Exam sponsor: Contractors State License Board (CSLB). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.
Questions
100 questions
Time Limit
3.5 hours
Passing Score
Scaled scoring
Reported exam pass rate: ~55%. This describes exam candidates, not OpenExamPrep users or results from using our resources. Exam sponsor website
Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.
Our practice resources: topics covered
We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.
Drainage, Waste & Vent Systems
CPC drain sizing, fixture units, slope requirements, cleanouts, trap seals, and DWV installation per California amendments
Water Supply & Distribution
Pipe sizing, backflow prevention, cross-connection control, water heaters, pressure regulation, and T&P relief requirements
Venting Systems
Vent sizing, wet venting, circuit venting, air admittance valves, vent termination per the CPC
Gas Piping & Appliances
Gas pipe sizing, BTU calculations, pressure testing, appliance venting, and combustion air requirements
Code Administration & Materials
Permits, inspections, approved materials, joint methods, pipe supports, and California-specific rules
Preparing for the CA Plumber Exam
What You Need to Know
- Passing score: Scaled scoring
- Exam length: 100 questions
- Time limit: 3.5 hours
- Exam / certification fees: $450+ Official sources
Using Our Practice Resources
- Work through all 298 available questions
- Review every answer and explanation
- Track weak areas and revisit them
- Use our AI tutor for tough concepts
CA Plumber: Suggested Study Strategy
Frequently Asked Questions
What plumbing code does California use?
California uses the California Plumbing Code (CPC), which is based on the UPC with extensive state amendments. The Contractors State License Board (CSLB) oversees all licensing requirements. The exam is based on the current adopted CPC edition.
How many questions are on the California plumber exam?
The California C-36 plumbing contractor exam has approximately 100 multiple-choice questions with a time limit of 3.5 hours. California uses scaled scoring rather than a fixed percentage — your score is adjusted based on question difficulty.
Who administers the California plumber exam?
The exam is administered by PSI on behalf of the Contractors State License Board (CSLB). You must apply through the agency and schedule your exam through PSI's testing system.
What experience is required for the California journeyman plumber exam?
At least 4 years of journeyman-level experience within the last 10 years as a plumber. Contact the Contractors State License Board (CSLB) for specific requirements and application procedures.