CSLB C-53 Swimming Pool (Trade Exam) Practice Test
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| Administering body | Contractors State License Board (CSLB), California Department of Consumer Affairs — exam delivered by PSI Services LLC |
|---|---|
| Questions | Not published by CSLB What we read and found nothing in: CSLB — Step 7: Studying for the Examination |
| Time limit | 210 minutes |
| Passing score | Not published by CSLB What we read and found nothing in: CSLB — Step 7: Studying for the Examination |
| Fees |
Source: CSLB — List of All CSLB Fees |
| Languages offered | English |
Frequently asked questions
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What is the CSLB Trade — Swimming Pool (C-53) exam like?+
A multiple-choice exam, 210 minutes. Practice by topic here, then take the full timed mock exam to gauge readiness.
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Is there a study guide for the CSLB Trade — Swimming Pool (C-53)?+
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Sample practice questions
A few sample questions from this free bank, with full explanations. Use the practice tool above for the whole set.
- 1. Planning and Estimating
On a plan drawn at 1/4 inch = 1 foot, a patio measures 5-1/2 inches. How long is the patio?
- a.5-1/2 feet
- b.22 feet
- c.11 feet
- d.44 feet
Answer: b
Explanation: At 1/4 inch to the foot each paper inch is 4 feet, so 5.5 × 4 = 22 feet. Eleven feet uses 1/2 inch = 1 foot, 44 feet uses 1/8 inch = 1 foot, and 5-1/2 feet ignores the scale.
Source: CSLB C-53 study guide 13E-53 (computation questions)
- 2. Planning and Estimating
A city lists four residential pool inspections. Which is called first?
- a.Pre-gunite
- b.Pre-deck
- c.Final
- d.Pre-plaster
Answer: a
Explanation: The order is pre-gunite, pre-deck, pre-plaster and final, following the order in which work is covered, so pre-gunite is first. Pre-deck is second, pre-plaster third and final last.
Source: City builder guide (Menifee)
- 3. Swimming Pool/Spa Shell Construction
A pool hole has 6 inches of rainwater and is still raining. What does Title 8 say about working in it?
- a.Work may continue if the pump is switched off
- b.Work may continue, since water is a nuisance
- c.Not without adequate precautions
- d.Work may continue if boots are worn
Answer: c
Explanation: Employees may not work in an excavation with accumulated or accumulating water unless adequate precautions protect them. Boots, a switched-off pump and calling it a nuisance do not control the hazard.
Source: Title 8 §1541(h)
- 4. Swimming Pool/Spa Shell Construction
How many points must perimeter surfaces be bonded to the pool's reinforcing steel, uniformly spaced?
- a.Two points around it
- b.One point around it
- c.Three points around it
- d.At least 4 points
Answer: d
Explanation: The handout requires perimeter surfaces bonded at a minimum of 4 points uniformly spaced. Fewer points do not meet the minimum, and 8 is more than the minimum.
Source: City bonding handout (Menifee), 2022 CEC §680.26
- 5. Swimming Pool/Spa Shell Construction
What does the code require of shotcrete above sags and sloughs?
- a.Left in place as it was shot
- b.Painted over once it has hardened
- c.Sanded after the shell has cured
- d.Removed and replaced when plastic
Answer: d
Explanation: Shotcrete above sags and sloughs shall be removed and replaced while still plastic. Painting, leaving it and later sanding keep the defect.
Source: 2025 CBC ch. 19 (shotcrete)
- 6. Pool/Spa Systems Installation
A factory-built spa, 3 feet deep, rests on a patio slab and uses a hard-wired heater circuit. What does one city's checklist say about permits?
- a.No permits, even for hardwiring
- b.A full engineered building permit and plan review
- c.A planning permit in place of the others
- d.No building permit, but an electrical permit
Answer: d
Explanation: Prefabricated spas not exceeding 4 feet deep on the ground or a slab are exempt from the building permit, while non-plug-in electrical connections need a permit. No permits at all ignores the hardwiring, a full engineered building permit is not required for an exempt spa, and a planning permit does not replace the building or electrical permits.
Source: City of Dublin checklist (Municipal Code 7.28.310)
- 7. Pool/Spa Deck and Shell Finish
A pool's handhold sits 14 inches above the waterline. How does the code treat it?
- a.It is too low, since 6 inches is required
- b.It exceeds the 9-inch maximum
- c.It meets the code, which allows 24 inches
- d.It meets the code, which allows 18 inches
Answer: b
Explanation: Handholds are installed not greater than 9 inches above the waterline, so 14 inches is too high. The stated allowances of 24 and 18 inches are not in the code, and no 6-inch minimum exists.
Source: 2025 CBC §3112B.1
- 8. Pool/Spa Repair, Renovation, Removal, and Maintenance
Which statement describes the sequence for removing a pool?
- a.Bury the shell without notice given
- b.Fill the pool with water and leave it
- c.Permit, disconnect, drain, fill, inspect
- d.Cover the pool with a tarp and wait
Answer: c
Explanation: Removal needs a permit, utility disconnection, controlled drainage, shell treatment, engineered fill and inspection. Filling with water, tarping and burying skip the required steps.
Source: CSLB C-53 outline (Pool/Spa Repair, Renovation, Removal, and Maintenance)
- 9. Safety
A spoil pile and a parked loader sit at an excavation edge. What is required?
- a.Cover them with a tarp
- b.Skip it, since the pile is low
- c.Keep them 25 feet from the edge
- d.Move them 2 feet back or restrain
Answer: d
Explanation: Materials and equipment that could fall or roll in are kept at least 2 feet from the edge or held by retaining devices. A tarp does not restrain them, and 25 feet is the trench egress figure.
Source: Title 8 §1541(j)
- 10. Safety
Which ASTM standard applies to pool alarms placed in the water?
- a.ASTM F2286
- b.ASTM F2387
- c.ASTM F2208
- d.ASTM F1346
Answer: c
Explanation: Pool alarms are independently certified to ASTM F2208. F2286 is mesh fencing, F1346 is safety covers, and F2387 is a vacuum release system.
Source: Health and Safety Code §115922(a)(6)