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AZ C-37 (CR-37) Plumbing Contractor
Practice Exam Comprehensive Question
Practice Test with Verified Answers and
Rationales 2026/2027 Graded A+ | 100% Pass
Guaranteed | Just Released
PART 1: SCOPE OF WORK AND LICENSING REQUIREMENTS
Question 1
Under Arizona law, which of the following best describes the C-37
plumbing contractor's scope of work?
A) Installation and repair of water and gas piping systems only
B) Installation, alteration, and repair of all plumbing when performed
solely within property lines and not on public easements
C) Residential plumbing only
D) Commercial plumbing only
Verified Answer: B
Rationale: The C-37 scope includes installation, alteration, and repair of
all plumbing when performed solely within property lines and not on
public easements or right-of-ways, except as provided. This includes
piping, fixtures, and appliances related to water supply, venting and
sanitary drainage, septic tanks, roof leaders, lawn sprinklers, water
conditioning equipment, and piping for swimming pools .
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Question 2
An Arizona C-37 plumbing contractor may install piping for hot water
heating systems operating at which maximum conditions?
A) Pressures not exceeding 15 psig or temperatures not exceeding 220°F
B) Pressures not exceeding 30 psig or temperatures not exceeding 220°F
C) Pressures not exceeding 50 psig or temperatures not exceeding 250°F
D) Pressures not exceeding 100 psig or temperatures not exceeding
300°F
Verified Answer: B
Rationale: The C-37 scope includes piping for hot water heating and hot
water supply systems operating at pressures not exceeding 30 psig or
temperatures not exceeding 220°F. It also includes steam heating
systems not exceeding 15 psig operating pressure .
Question 3
A C-37 contractor is asked to install a gas-fired space heater. May the
contractor perform this work?
A) No, gas work requires a separate license
B) Yes, but only if not connected to ductwork
C) Yes, including ductwork
D) Only for residential properties
Verified Answer: B
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Rationale: C-37 permits installation of gas or oil fired space heaters and
furnaces, excluding duct work. The ductwork portion would require a
separate specialty license .
Question 4
When installing sewer, gas, and water lines from a structure to public
supply, which of the following is true?
A) These lines may not cross public easements
B) These lines may cross public or private easements but may not be
increased in size between the point of exit from private property and the
connection point
C) These lines must always be installed on private property only
D) These lines require a separate right-of-way permit
Verified Answer: B
Rationale: Sewer, gas and water lines may cross public or private
easements or be installed within private easements. However, pipes
installed across public property may not be increased in size or make
any other connection between the point of exit from private property to
the point of connection at public supply or disposal .
Question 5
Under the C-37 scope, which systems may a plumbing contractor
install?
A) Residential lawn sprinklers only
B) Electrical conduit systems
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C) Hydronic heating, fire sprinkler systems, interceptors for grease and
wastewater
D) Roofing drainage only
Verified Answer: C
Rationale: Commercial plumbing contractors often handle hydronics,
fire sprinklers, interceptors, separators, and other specialty plumbing
beyond basic DWV and supply systems .
Question 6
What is the difference between a C-37 and CR-37 license in Arizona?
A) There is no difference
B) C-37 is for commercial plumbing, while CR-37 allows both
residential and commercial contracts
C) CR-37 is for residential only
D) C-37 requires more experience
Verified Answer: B
Rationale: A C-37 license is for commercial plumbing, while CR-37
allows for both residential and commercial contracts. Both licenses have
the same experience and legal requirements, though surety bond limits
may differ .
Question 7
AZ C-37 (CR-37) Plumbing Contractor
Practice Exam Comprehensive Question
Practice Test with Verified Answers and
Rationales 2026/2027 Graded A+ | 100% Pass
Guaranteed | Just Released
PART 1: SCOPE OF WORK AND LICENSING REQUIREMENTS
Question 1
Under Arizona law, which of the following best describes the C-37
plumbing contractor's scope of work?
A) Installation and repair of water and gas piping systems only
B) Installation, alteration, and repair of all plumbing when performed
solely within property lines and not on public easements
C) Residential plumbing only
D) Commercial plumbing only
Verified Answer: B
Rationale: The C-37 scope includes installation, alteration, and repair of
all plumbing when performed solely within property lines and not on
public easements or right-of-ways, except as provided. This includes
piping, fixtures, and appliances related to water supply, venting and
sanitary drainage, septic tanks, roof leaders, lawn sprinklers, water
conditioning equipment, and piping for swimming pools .
,2 | Page
Question 2
An Arizona C-37 plumbing contractor may install piping for hot water
heating systems operating at which maximum conditions?
A) Pressures not exceeding 15 psig or temperatures not exceeding 220°F
B) Pressures not exceeding 30 psig or temperatures not exceeding 220°F
C) Pressures not exceeding 50 psig or temperatures not exceeding 250°F
D) Pressures not exceeding 100 psig or temperatures not exceeding
300°F
Verified Answer: B
Rationale: The C-37 scope includes piping for hot water heating and hot
water supply systems operating at pressures not exceeding 30 psig or
temperatures not exceeding 220°F. It also includes steam heating
systems not exceeding 15 psig operating pressure .
Question 3
A C-37 contractor is asked to install a gas-fired space heater. May the
contractor perform this work?
A) No, gas work requires a separate license
B) Yes, but only if not connected to ductwork
C) Yes, including ductwork
D) Only for residential properties
Verified Answer: B
,3 | Page
Rationale: C-37 permits installation of gas or oil fired space heaters and
furnaces, excluding duct work. The ductwork portion would require a
separate specialty license .
Question 4
When installing sewer, gas, and water lines from a structure to public
supply, which of the following is true?
A) These lines may not cross public easements
B) These lines may cross public or private easements but may not be
increased in size between the point of exit from private property and the
connection point
C) These lines must always be installed on private property only
D) These lines require a separate right-of-way permit
Verified Answer: B
Rationale: Sewer, gas and water lines may cross public or private
easements or be installed within private easements. However, pipes
installed across public property may not be increased in size or make
any other connection between the point of exit from private property to
the point of connection at public supply or disposal .
Question 5
Under the C-37 scope, which systems may a plumbing contractor
install?
A) Residential lawn sprinklers only
B) Electrical conduit systems
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C) Hydronic heating, fire sprinkler systems, interceptors for grease and
wastewater
D) Roofing drainage only
Verified Answer: C
Rationale: Commercial plumbing contractors often handle hydronics,
fire sprinklers, interceptors, separators, and other specialty plumbing
beyond basic DWV and supply systems .
Question 6
What is the difference between a C-37 and CR-37 license in Arizona?
A) There is no difference
B) C-37 is for commercial plumbing, while CR-37 allows both
residential and commercial contracts
C) CR-37 is for residential only
D) C-37 requires more experience
Verified Answer: B
Rationale: A C-37 license is for commercial plumbing, while CR-37
allows for both residential and commercial contracts. Both licenses have
the same experience and legal requirements, though surety bond limits
may differ .
Question 7
