CSLB Plumbing (C-36)
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.
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🎯 Full timed mock exam
A 100-question, 3.5-hour simulation to test your readiness.
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