CSLB Plumbing (C-36)

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Free practice for the California CSLB C-36 Plumbing trade exam — the craft/classification test you take in addition to the Law & Business exam. Original questions in English, 中文 and Español, with California Plumbing Code (UPC-based) references.

To get a C-36 Plumbing license you must pass BOTH exams — the Law & Business exam and this C-36 Plumbing trade exam. Both are about 3.5 hours at a PSI center. CSLB does not publish the exact question count or passing score for the trade exam; you're told the passing mark at the test site.

What the C-36 trade exam covers

26%
Drainage, Waste & Vent
DWV sizing · slope · traps · venting · cleanouts · interceptors
22%
Water Supply & Distribution
water service · pipe sizing · pressure · backflow · materials · hangers
18%
Fixtures & Water Heaters
fixtures · T&P & seismic · drain pans · flush rates · expansion
12%
Planning & Estimating
isometrics · symbols · permits & inspection · takeoff & estimating
12%
Gas Piping
gas pipe sizing · materials · shutoffs & sediment traps · testing
10%
Safety
Cal/OSHA · trenching · confined space · cross-connection · hot work
Study guide →Browse all questions →CSLB Law & Business exam →

Helpful resources

Apply / register — CSLB (official) →
Recommended prep — books & tools
  • Uniform Plumbing Code (UPC)

    The plumbing code California's C-36 trade exam is based on.

    See it on Amazon →
  • Ugly's Plumbing References

    Quick sizing charts and tables for exam calculations and the field.

    See it on Amazon →

This section contains affiliate links. As an Amazon Associate, PrepPass earns from qualifying purchases. We may earn a commission if you buy through these links, at no extra cost to you.

Frequently asked questions

Is PrepPass's CSLB Plumbing (C-36) Trade practice free?

Yes — every CSLB Plumbing (C-36) Trade practice question, study guide, and lesson on PrepPass is free. A full timed mock exam is also included at no cost.

How many CSLB Plumbing (C-36) Trade practice questions does PrepPass have?

PrepPass currently has 360 original CSLB Plumbing (C-36) Trade practice questions across 6 topic areas, and every question comes with a written answer explanation.

What languages is PrepPass's CSLB Plumbing (C-36) Trade prep available in?

English, 中文 (Chinese), Español (Spanish), and Tiếng Việt (Vietnamese).

How are PrepPass's CSLB Plumbing (C-36) Trade questions written?

They are original questions written by PrepPass from public-domain statutes and official exam blueprints — never copied from the real exam. Read our question methodology →

Is PrepPass affiliated with the licensing board or exam provider?

No. PrepPass is an independent study resource and is not affiliated with, endorsed by, or connected to any licensing board or official exam provider.

Can I practice CSLB Plumbing (C-36) Trade on my phone?

Yes — PrepPass runs in any mobile or desktop web browser, with no app to download.

Own the complete CSLB Class C-36 — Plumbing (Trade Exam) guide — PDF + EPUB, $14.99 →

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