FLORIDA PLUMBING CONTRACTOR LICENSE EXAM
COMPLETE EXAM QUESTIONS AND VERIFIED ANSWERS |
2026–2027 LATEST UPDATE | GUARANTEED PASS | DETAILED
RATIONALES | FULL STUDY GUIDE | EXAM PREP | PRACTICE
TEST | CERTIFICATION PREPARATION
SECTION ONE — QUESTIONS 1–100
1) Which of the following best describes the scope of work for a Florida Certified Plumbing
Contractor regarding medical gas systems?
A) Medical gas systems are explicitly excluded from the scope of work for a plumbing contractor
B) A plumbing contractor may install, maintain, repair, alter, or extend air-piping, vacuum line piping,
oxygen line piping, and nitrous oxide piping
C) Medical gas systems may only be installed by a separately certified medical gas contractor
D) A plumbing contractor may design medical gas systems but must subcontract all installation work
Correct Answer: B) A plumbing contractor may install, maintain, repair, alter, or extend air-piping,
vacuum line piping, oxygen line piping, and nitrous oxide piping
Rationale: The Florida Plumbing Contractor scope explicitly includes medical gas systems such as air-
piping, vacuum line piping, oxygen line piping, and nitrous oxide piping, provided these installations
comply with all applicable plans, specifications, codes, laws, and regulations . This work is part of the
unlimited trade scope.
2) What is the primary purpose of a plumbing vent system in a sanitary drainage system?
A) To provide an emergency overflow path for sewage backups
B) To allow fresh air to enter the system and prevent siphonage of trap seals
C) To facilitate cleaning and maintenance of the drainage piping
D) To reduce the volume of wastewater entering the public sewer
Correct Answer: B) To allow fresh air to enter the system and prevent siphonage of trap seals
Rationale: Vent systems protect trap seals from siphonage and backpressure by equalizing air
pressure within the drainage system. Without proper venting, trap seals can be lost, allowing sewer
gases to enter the building . This is a fundamental plumbing concept tested on the exam.
3) Which of the following is the minimum amount of general liability insurance required for a
Florida Plumbing Contractor?
A) $100,000 for bodily injury and $25,000 for property damage
B) $50,000 for bodily injury and $10,000 for property damage
C) $300,000 for bodily injury and $50,000 for property damage
D) $1,000,000 for bodily injury and $100,000 for property damage
Correct Answer: A) $100,000 for bodily injury and $25,000 for property damage
,Rationale: The Florida Construction Industry Licensing Board (CILB) requires plumbing contractors to
maintain minimum general liability insurance of $100,000 for bodily injury and $25,000 for property
damage . Contractors must also obtain workers' compensation insurance or an exemption within 30
days of license issuance.
4) According to the Florida Building Code, which of the following is the minimum trap seal depth
required for a plumbing fixture?
A) 1 inch
B) 2 inches
C) 3 inches
D) 4 inches
Correct Answer: B) 2 inches
Rationale: The Florida Building Code, Plumbing, requires that all plumbing fixtures have a trap seal
depth of not less than 2 inches and not more than 4 inches. The 2-inch minimum ensures an adequate
water seal to prevent sewer gas entry while allowing proper drainage flow.
5) A plumbing contractor is designing a water supply system for a commercial building. Which of
the following principles must be applied to prevent backflow contamination?
A) Install check valves at all fixture supply connections
B) Provide air gaps or approved backflow prevention devices at cross-connection points
C) Maintain water pressure at a minimum of 80 psi throughout the system
D) Use only copper piping for all potable water supply lines
Correct Answer: B) Provide air gaps or approved backflow prevention devices at cross-connection
points
Rationale: Backflow prevention is essential to protect potable water supplies from contamination.
The Florida Building Code requires air gaps or approved backflow prevention assemblies at all cross-
connection points where non-potable water could enter the potable supply . Check valves alone do
not provide adequate protection.
6) Which of the following situations would most likely require a plumbing contractor to
subcontract work to another trade?
A) Installation of a new water heater in a residential home
B) Replacement of a section of sanitary sewer line under a public street
C) Installation of a fire sprinkler system requiring electrical connections
D) Repair of a leaking pipe in a commercial kitchen
Correct Answer: C) Installation of a fire sprinkler system requiring electrical connections
Rationale: Florida law requires plumbing contractors to subcontract work that is specified as the
work of a trade other than plumbing, such as electrical work . While plumbing contractors may install
fire line standpipes and fire sprinklers where authorized, electrical connections must be performed by
a licensed electrical contractor.
, 7) What is the maximum number of consecutive questions in this exam that may have the same
correct answer letter?
A) 2
B) 3
C) 4
D) No limit
Correct Answer: B) 3
Rationale: This is a test-taking strategy question for understanding exam construction. Certification
exams typically limit consecutive identical answers to no more than three to ensure a balanced
distribution and prevent patterns that could aid guessing .
8) A plumbing contractor is preparing to install a septic tank system in a Florida residential
development. Which Florida Administrative Code chapter governs the standards for onsite sewage
treatment and disposal systems?
A) Chapter 62-6, Florida Administrative Code
B) Chapter 64E-6, Florida Administrative Code
C) Chapter 61G4, Florida Administrative Code
D) Chapter 40E-6, Florida Administrative Code
Correct Answer: B) Chapter 64E-6, Florida Administrative Code
Rationale: Chapter 64E-6 of the Florida Administrative Code establishes the Standards for Onsite
Sewage Treatment and Disposal Systems . This regulation is a key reference for the exam and covers
requirements for septic tanks, drainfields, and other onsite wastewater treatment systems.
9) Which of the following is a requirement for obtaining a Florida Certified Plumbing Contractor
license?
A) Completion of a 4-year college degree in engineering
B) 4 years of experience in the trade with at least 1 year of supervisory work
C) A passing score on the Business and Finance exam only
D) Residency in Florida for at least 2 years prior to application
Correct Answer: B) 4 years of experience in the trade with at least 1 year of supervisory work
Rationale: Applicants must have 4 years of experience in the plumbing trade, with at least 1 year
being supervisory work, or an equivalent combination of college education and experience . Both the
Trade Knowledge and Business and Finance examinations must be passed.
10) What is the purpose of a cleanout in a drainage system?
A) To provide ventilation to the drainage system
B) To allow access for cleaning and removing obstructions
C) To catch debris before it enters the sewer
D) To serve as an emergency overflow point
Correct Answer: B) To allow access for cleaning and removing obstructions
COMPLETE EXAM QUESTIONS AND VERIFIED ANSWERS |
2026–2027 LATEST UPDATE | GUARANTEED PASS | DETAILED
RATIONALES | FULL STUDY GUIDE | EXAM PREP | PRACTICE
TEST | CERTIFICATION PREPARATION
SECTION ONE — QUESTIONS 1–100
1) Which of the following best describes the scope of work for a Florida Certified Plumbing
Contractor regarding medical gas systems?
A) Medical gas systems are explicitly excluded from the scope of work for a plumbing contractor
B) A plumbing contractor may install, maintain, repair, alter, or extend air-piping, vacuum line piping,
oxygen line piping, and nitrous oxide piping
C) Medical gas systems may only be installed by a separately certified medical gas contractor
D) A plumbing contractor may design medical gas systems but must subcontract all installation work
Correct Answer: B) A plumbing contractor may install, maintain, repair, alter, or extend air-piping,
vacuum line piping, oxygen line piping, and nitrous oxide piping
Rationale: The Florida Plumbing Contractor scope explicitly includes medical gas systems such as air-
piping, vacuum line piping, oxygen line piping, and nitrous oxide piping, provided these installations
comply with all applicable plans, specifications, codes, laws, and regulations . This work is part of the
unlimited trade scope.
2) What is the primary purpose of a plumbing vent system in a sanitary drainage system?
A) To provide an emergency overflow path for sewage backups
B) To allow fresh air to enter the system and prevent siphonage of trap seals
C) To facilitate cleaning and maintenance of the drainage piping
D) To reduce the volume of wastewater entering the public sewer
Correct Answer: B) To allow fresh air to enter the system and prevent siphonage of trap seals
Rationale: Vent systems protect trap seals from siphonage and backpressure by equalizing air
pressure within the drainage system. Without proper venting, trap seals can be lost, allowing sewer
gases to enter the building . This is a fundamental plumbing concept tested on the exam.
3) Which of the following is the minimum amount of general liability insurance required for a
Florida Plumbing Contractor?
A) $100,000 for bodily injury and $25,000 for property damage
B) $50,000 for bodily injury and $10,000 for property damage
C) $300,000 for bodily injury and $50,000 for property damage
D) $1,000,000 for bodily injury and $100,000 for property damage
Correct Answer: A) $100,000 for bodily injury and $25,000 for property damage
,Rationale: The Florida Construction Industry Licensing Board (CILB) requires plumbing contractors to
maintain minimum general liability insurance of $100,000 for bodily injury and $25,000 for property
damage . Contractors must also obtain workers' compensation insurance or an exemption within 30
days of license issuance.
4) According to the Florida Building Code, which of the following is the minimum trap seal depth
required for a plumbing fixture?
A) 1 inch
B) 2 inches
C) 3 inches
D) 4 inches
Correct Answer: B) 2 inches
Rationale: The Florida Building Code, Plumbing, requires that all plumbing fixtures have a trap seal
depth of not less than 2 inches and not more than 4 inches. The 2-inch minimum ensures an adequate
water seal to prevent sewer gas entry while allowing proper drainage flow.
5) A plumbing contractor is designing a water supply system for a commercial building. Which of
the following principles must be applied to prevent backflow contamination?
A) Install check valves at all fixture supply connections
B) Provide air gaps or approved backflow prevention devices at cross-connection points
C) Maintain water pressure at a minimum of 80 psi throughout the system
D) Use only copper piping for all potable water supply lines
Correct Answer: B) Provide air gaps or approved backflow prevention devices at cross-connection
points
Rationale: Backflow prevention is essential to protect potable water supplies from contamination.
The Florida Building Code requires air gaps or approved backflow prevention assemblies at all cross-
connection points where non-potable water could enter the potable supply . Check valves alone do
not provide adequate protection.
6) Which of the following situations would most likely require a plumbing contractor to
subcontract work to another trade?
A) Installation of a new water heater in a residential home
B) Replacement of a section of sanitary sewer line under a public street
C) Installation of a fire sprinkler system requiring electrical connections
D) Repair of a leaking pipe in a commercial kitchen
Correct Answer: C) Installation of a fire sprinkler system requiring electrical connections
Rationale: Florida law requires plumbing contractors to subcontract work that is specified as the
work of a trade other than plumbing, such as electrical work . While plumbing contractors may install
fire line standpipes and fire sprinklers where authorized, electrical connections must be performed by
a licensed electrical contractor.
, 7) What is the maximum number of consecutive questions in this exam that may have the same
correct answer letter?
A) 2
B) 3
C) 4
D) No limit
Correct Answer: B) 3
Rationale: This is a test-taking strategy question for understanding exam construction. Certification
exams typically limit consecutive identical answers to no more than three to ensure a balanced
distribution and prevent patterns that could aid guessing .
8) A plumbing contractor is preparing to install a septic tank system in a Florida residential
development. Which Florida Administrative Code chapter governs the standards for onsite sewage
treatment and disposal systems?
A) Chapter 62-6, Florida Administrative Code
B) Chapter 64E-6, Florida Administrative Code
C) Chapter 61G4, Florida Administrative Code
D) Chapter 40E-6, Florida Administrative Code
Correct Answer: B) Chapter 64E-6, Florida Administrative Code
Rationale: Chapter 64E-6 of the Florida Administrative Code establishes the Standards for Onsite
Sewage Treatment and Disposal Systems . This regulation is a key reference for the exam and covers
requirements for septic tanks, drainfields, and other onsite wastewater treatment systems.
9) Which of the following is a requirement for obtaining a Florida Certified Plumbing Contractor
license?
A) Completion of a 4-year college degree in engineering
B) 4 years of experience in the trade with at least 1 year of supervisory work
C) A passing score on the Business and Finance exam only
D) Residency in Florida for at least 2 years prior to application
Correct Answer: B) 4 years of experience in the trade with at least 1 year of supervisory work
Rationale: Applicants must have 4 years of experience in the plumbing trade, with at least 1 year
being supervisory work, or an equivalent combination of college education and experience . Both the
Trade Knowledge and Business and Finance examinations must be passed.
10) What is the purpose of a cleanout in a drainage system?
A) To provide ventilation to the drainage system
B) To allow access for cleaning and removing obstructions
C) To catch debris before it enters the sewer
D) To serve as an emergency overflow point
Correct Answer: B) To allow access for cleaning and removing obstructions
