Exam Questions And Correct Answers

Florida Certified Plumbing Contractor Exam Questions And Correct Answers (Verified Answers) Plus Rationale2026 Q&A| Instant Download Pdf

• What is the minimum slope required for a 3-inch horizontal drainage

pipe under the Florida Plumbing Code?

• 1/8 inch per foot
• 1/4 inch per foot
• 3/8 inch per foot
• 1/2 inch per foot

Rationale: The code requires a minimum slope of 1/4 inch per foot for

drainage piping 3 inches or smaller to maintain proper flow.

• What is the minimum required air gap for a fixture outlet under the

Florida Plumbing Code?

• 1× the fixture outlet diameter
• 2× the fixture outlet diameter
• 3× the fixture outlet diameter
• 4× the fixture outlet diameter

Rationale: The minimum air gap is twice the fixture outlet diameter to

prevent backflow.

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• The maximum distance from a trap to its vent for a 1½-inch trap arm

is:

• 2 feet
• 3 feet
• 3 feet 6 inches
• 5 feet

Rationale: A 1½-inch trap arm may be up to 3 feet 6 inches in developed

length to the vent.

• A cleanout must be installed so that it is accessible and located no

more than how many feet apart in a building drain?

• 50 feet
• 100 feet
• 75 feet
• 125 feet

Rationale: The code requires cleanouts every 100 feet on horizontal

drainage runs.

• What is the minimum size building sewer permitted?
• 2 inches
• 3 inches
• 4 inches
• 6 inches

Rationale: A building sewer must be at least 4 inches in diameter by

Florida code.

• The minimum working pressure for potable water supply piping

inside a building must be: 2 / 3

• 10 psi
• 15 psi
• 20 psi
• 25 psi

Rationale: The code specifies a minimum of 20 psi for water distribution

systems.

• A water service pipe must be installed at least how deep below grade?
• 6 inches
• 8 inches
• 12 inches
• 12 inches plus frost depth (if applicable)

Rationale: Florida requires at least 12 inches of cover, with adjustments in

freeze zones.

• Which material is NOT permitted for water distribution inside a

building?

• Copper

B. CPVC

C. PEX

D. PVC

Rationale: PVC may not be used for interior hot or cold potable water

distribution.

• A pressure relief valve on a water heater must discharge to a

termination point no more than:

• 2 inches above the floor
• 4 inches above the floor
• 6 inches above the floor
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