CSLB Swimming Pool (C-53): Online Practice Exam

What this exam covers

Practice questions for the California CSLB Swimming Pool (C-53) license exam, delivered online and graded instantly. Per the state's classification, a C-53 contractor designs, constructs, and services swimming pools, spas, hot tubs, and related water features including excavation, plumbing, gunite, electrical, and pool equipment. Works on any device, including iPad. See the official CSLB C53 classification.

Topics tested

1. Design
2. Excavation
3. Building layout
4. Plumbing
5. Swimming pools & solar
6. Gunite
7. Electrical
8. Blueprint reading
9. Tools, material & equipment
10. Safety
11. Start up & maintenance
12. Mathematics
13. Code

Updated July 2026 · 2022 CA Codes · 422 Questions · Topic Practice

• Content Last Updated: July 24, 2026
• Code Basis: 2022 California Codes
• Question Count: 422 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 horsepower of the filter pump should be at least ______ for a small pool (less than 15,000 gallons).
   A. ¼ hp · ✓ B. ½ hp
2. You notice a pressure gauge reads 8-10 lbs over normal. You should:
   ✓ A. Backwash the pool's sand filter · B. Begin to drain
3. For water heating units rated up to, and including, 200,000 BTU/hr. input, the relief valve should be:
   A. A.S.M.E. · ✓ B. A.G.A.
4. When beginning excavation for a swimming pool, where do you start?
   A. Where the skimmer will be · B. The deep end · ✓ C. The shallow end · D. Where the main drain will be
5. NSPI stands for:
   A. Non-standard Pool Inspection · B. Normal Swimming Pool Installation · ✓ C. National Spa and Pool Institute · D. National Swimming Pool Industry