AZ C -37 (CR 37 ) PLUMBING CONTRACTOR
2026/2027 PRACTICE EXAM |ACTUAL QUESTIONS
AND VERIFIED ANSWERS (100% GUARANTEED
PASS)
Question 1
What is the primary plumbing code adopted by the State of Arizona?
A) International Plumbing Code (IPC)
B) Uniform Plumbing Code (UPC)
C) National Standard Plumbing Code (NSPC)
D) Arizona State Plumbing Code (ASPC)
Answer: B
Arizona has historically adopted and amended the Uniform Plumbing Code (UPC), published by the International
Association of Plumbing and Mechanical Officials (IAPMO).
Question 2
Which state agency is primarily responsible for administering and enforcing plumbing laws and rules in Arizona?
A) Arizona Department of Environmental Quality (ADEQ)
B) Arizona Department of Health Services (ADHS)
C) Arizona Registrar of Contractors (ROC)
D) Arizona State Board of Technical Registration
1|Page
,Answer: C
The Arizona Registrar of Contractors (ROC) licenses plumbing contractors and journeymen and enforces the
statutes and rules related to plumbing work.
Question 3
What is the minimum passing score for the Arizona plumbing contractor (C-37) or journeyman (CR-37) licensing
exam?
A) 60%
B) 70%
C) 75%
D) 80%
Answer: B
According to the Arizona Registrar of Contractors, the minimum passing score for plumbing exams is 70%.
Question 4
A plumbing "journeyman" in Arizona (CR-37) is allowed to:
A) Pull permits and contract directly with owners
B) Perform plumbing work under the supervision of a licensed plumbing contractor
C) Design plumbing systems for commercial buildings
D) Work without any supervision
Answer: B
A journeyman (CR-37) can perform plumbing work but must be employed by and under the supervision of a
licensed C-37 plumbing contractor, who holds the license to contract and pull permits.
Question 5
Who is legally allowed to pull a plumbing permit in Arizona?
A) The property owner for their own residence
B) A licensed plumbing contractor (C-37)
C) A journeyman plumber (CR-37)
D) Any licensed general contractor
2|Page
,Answer: B
Only the licensed plumbing contractor of record—or sometimes the property owner for their own primary
residence (owner-builder)—can pull a plumbing permit. A journeyman cannot pull permits.
Question 6
What is the primary purpose of a plumbing "trap" on a fixture drain?
A) To slow the flow of waste
B) To maintain a water seal that prevents sewer gases from entering the building
C) To catch debris and prevent clogs
D) To provide access for cleaning
Answer: B
A trap maintains a water seal that blocks sewer gases from entering the building, ensuring a sanitary, odor-free
interior.
Question 7
Which type of trap is most commonly used under a lavatory sink?
A) S-trap
B) P-trap
C) Drum trap
D) Bell trap
Answer: B
P-traps are the standard under sinks because they reliably maintain a water seal, are easy to clean and
maintain, and comply with modern plumbing code requirements.
Question 8
In a drainage system, what is the purpose of a vent pipe?
A) To carry waste to the sewer
B) To provide a path for heat to escape
C) To filter waste before disposal
D) To allow fresh air into the system to prevent vacuum formation and siphoning of traps
3|Page
, Answer: D
Vent pipes equalize air pressure in drain-waste-vent (DWV) systems, preventing trap siphonage and allowing
wastewater to flow smoothly.
Question 9
Which of the following materials is commonly used for water supply piping in residential plumbing due to its
corrosion resistance and flexibility?
A) Galvanized steel
B) PEX (cross-linked polyethylene)
C) PVC (polyvinyl chloride)
D) Cast iron
Answer: B
PEX is widely used in residential plumbing because it resists corrosion, is flexible for easier installation, and can
handle both hot and cold water supply.
Question 10
What is the minimum water seal depth recommended for a standard P-trap?
A) 1 inch
B) 2 inches
C) 2 inches minimum, up to 4 inches
D) 6 inches
Answer: C
The water seal in a P-trap must be at least 2 inches to effectively block sewer gases, with a common maximum of
4 inches to ensure proper functionality without siphoning.
Question 11
In Arizona, a licensed C-37 Plumbing Contractor installs a water heater. What is the required clearance from the
top of a gas water heater to combustible materials?
A) 6 inches
B) 12 inches
C) 18 inches
D) 24 inches
4|Page
2026/2027 PRACTICE EXAM |ACTUAL QUESTIONS
AND VERIFIED ANSWERS (100% GUARANTEED
PASS)
Question 1
What is the primary plumbing code adopted by the State of Arizona?
A) International Plumbing Code (IPC)
B) Uniform Plumbing Code (UPC)
C) National Standard Plumbing Code (NSPC)
D) Arizona State Plumbing Code (ASPC)
Answer: B
Arizona has historically adopted and amended the Uniform Plumbing Code (UPC), published by the International
Association of Plumbing and Mechanical Officials (IAPMO).
Question 2
Which state agency is primarily responsible for administering and enforcing plumbing laws and rules in Arizona?
A) Arizona Department of Environmental Quality (ADEQ)
B) Arizona Department of Health Services (ADHS)
C) Arizona Registrar of Contractors (ROC)
D) Arizona State Board of Technical Registration
1|Page
,Answer: C
The Arizona Registrar of Contractors (ROC) licenses plumbing contractors and journeymen and enforces the
statutes and rules related to plumbing work.
Question 3
What is the minimum passing score for the Arizona plumbing contractor (C-37) or journeyman (CR-37) licensing
exam?
A) 60%
B) 70%
C) 75%
D) 80%
Answer: B
According to the Arizona Registrar of Contractors, the minimum passing score for plumbing exams is 70%.
Question 4
A plumbing "journeyman" in Arizona (CR-37) is allowed to:
A) Pull permits and contract directly with owners
B) Perform plumbing work under the supervision of a licensed plumbing contractor
C) Design plumbing systems for commercial buildings
D) Work without any supervision
Answer: B
A journeyman (CR-37) can perform plumbing work but must be employed by and under the supervision of a
licensed C-37 plumbing contractor, who holds the license to contract and pull permits.
Question 5
Who is legally allowed to pull a plumbing permit in Arizona?
A) The property owner for their own residence
B) A licensed plumbing contractor (C-37)
C) A journeyman plumber (CR-37)
D) Any licensed general contractor
2|Page
,Answer: B
Only the licensed plumbing contractor of record—or sometimes the property owner for their own primary
residence (owner-builder)—can pull a plumbing permit. A journeyman cannot pull permits.
Question 6
What is the primary purpose of a plumbing "trap" on a fixture drain?
A) To slow the flow of waste
B) To maintain a water seal that prevents sewer gases from entering the building
C) To catch debris and prevent clogs
D) To provide access for cleaning
Answer: B
A trap maintains a water seal that blocks sewer gases from entering the building, ensuring a sanitary, odor-free
interior.
Question 7
Which type of trap is most commonly used under a lavatory sink?
A) S-trap
B) P-trap
C) Drum trap
D) Bell trap
Answer: B
P-traps are the standard under sinks because they reliably maintain a water seal, are easy to clean and
maintain, and comply with modern plumbing code requirements.
Question 8
In a drainage system, what is the purpose of a vent pipe?
A) To carry waste to the sewer
B) To provide a path for heat to escape
C) To filter waste before disposal
D) To allow fresh air into the system to prevent vacuum formation and siphoning of traps
3|Page
, Answer: D
Vent pipes equalize air pressure in drain-waste-vent (DWV) systems, preventing trap siphonage and allowing
wastewater to flow smoothly.
Question 9
Which of the following materials is commonly used for water supply piping in residential plumbing due to its
corrosion resistance and flexibility?
A) Galvanized steel
B) PEX (cross-linked polyethylene)
C) PVC (polyvinyl chloride)
D) Cast iron
Answer: B
PEX is widely used in residential plumbing because it resists corrosion, is flexible for easier installation, and can
handle both hot and cold water supply.
Question 10
What is the minimum water seal depth recommended for a standard P-trap?
A) 1 inch
B) 2 inches
C) 2 inches minimum, up to 4 inches
D) 6 inches
Answer: C
The water seal in a P-trap must be at least 2 inches to effectively block sewer gases, with a common maximum of
4 inches to ensure proper functionality without siphoning.
Question 11
In Arizona, a licensed C-37 Plumbing Contractor installs a water heater. What is the required clearance from the
top of a gas water heater to combustible materials?
A) 6 inches
B) 12 inches
C) 18 inches
D) 24 inches
4|Page
