CSLB Plumbing (C-36): Online Practice Exam

What this exam covers

Practice questions for the California CSLB Plumbing (C-36) license exam, delivered online and graded instantly. 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. Works on any device, including iPad. See the official CSLB C36 classification.

Updated July 2026 · 2022 CA Codes · 663 Questions · Topic Practice

• Content Last Updated: July 24, 2026
• Code Basis: 2022 California Codes
• Question Count: 663 practice questions
• Organized By: CSLB study-guide topic categories
• Includes: This practice exam has been updated using Peerless’s vetted usable question set. Questions are organized by CSLB study-guide topic categories and include answer explanations to support full-exam review and focused topic practice. Each topic has a mini-exam to help you develop mastery.

Sample questions — Try our free practice test

1. 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
2. What is the typical daily water usage per person in a home?
   A. 15 gallons · B. 25 gallons · ✓ C. 50 gallons · D. 75 gallons
3. 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