CSLB Plumbing (C-36): Study Guide and Online Practice Exam

What’s included

• Learn the material: Plumbing (C-36) Study Guide Book
• Pass the test: Plumbing (C-36) Practice Exam

What this covers

Per the state's classification, a C-36 contractor installs, alters, and repairs water supply systems, drainage systems, gas lines, sewers, and plumbing fixtures in residential and commercial structures. This printed book covers the subjects the state tests. See the official CSLB C-36 classification.

Sample questions — Try our free practice test

1. Unless listed as flammable-vapor-ignition-resistant, how high above a residential garage floor must a gas water heater’s pilots, burners, and burner-igniter devices be installed?
   A. 12 inches · B. 18 inches ✓ · C. 24 inches · D. 36 inches
   Answer basis: 2025 CPC §507.13.
2. Under the 2025 California Plumbing Code, what is the maximum permitted distance between gas utilization equipment and its accessible manual shutoff valve?
   A. 3 feet · B. 4 feet · C. 6 feet ✓ · D. 10 feet
   Answer basis: 2025 CPC §1212.6.
3. Of the following, which single-wall appliance vent connection is permitted?
   A. Horizontally in a plastered partition · B. Vertically through the attic · C. Vertically through the floor to the roof · ✓ D. Through the exterior wall to the outer air
4. The minimum size strap for a hot water heater is:
   A. 1"- 20 gauge · B. 1-1/4"- 18 gauge · ✓ C. 1-1/2"-16 gauge · D. 2"-16 gauge
5. What is the typical daily water usage per person in a home?
   A. 15 gallons · B. 25 gallons · ✓ C. 50 gallons · D. 75 gallons
6. To test for leaks in a gas piping system use:
   A. a flame · ✓ B. a solution of soapy water · C. a sharp nose · D. a canary