MAINE STATE JOURNEYMAN EXAM 2026 – UP
TO 15GPH | COMPLETE QUESTIONS &
VERIFIED ANSWERS | 100% GUARANTEED
PASS
MAINE STATE JOURNEYMAN EXAM 2026 – UP TO 15 GPH
COMPLETE QUESTIONS & VERIFIED ANSWERS | 100% GUARANTEED PASS
QUESTION 1
What is the maximum allowable water heater temperature setting to prevent scalding in
residential installations?
A. 100°F
B. 110°F
C. 120°F
D. 130°F
E. 140°F
✔ CORRECT ANSWER: C. 120°F
RATIONALE: The maximum recommended water heater temperature for
residential use is 120°F to prevent scalding injuries, particularly for children and the
elderly. This is the standard set by most plumbing codes.
QUESTION 2
Which type of pipe is NOT permitted for use in gas supply lines inside a residential
building?
A. Black steel pipe
B. CSST (Corrugated Stainless Steel Tubing)
C. Copper tubing (where approved)
,D. PVC pipe
E. Schedule 40 steel pipe
✔ CORRECT ANSWER: D. PVC pipe
RATIONALE: PVC pipe is not approved for gas supply lines because it is not
designed to handle the pressures and chemical properties of natural gas or propane.
Only metallic piping systems or approved CSST are used for gas lines.
QUESTION 3
A journeyman plumber in Maine is required to have how many years of experience
before applying for licensure?
A. 1 year
B. 2 years
C. 3 years
D. 4 years
E. 5 years
✔ CORRECT ANSWER: D. 4 years
RATIONALE: Maine requires a minimum of 4 years of documented plumbing
experience under a licensed master plumber before a candidate is eligible to sit for the
journeyman plumbing examination.
QUESTION 4
What is the minimum slope required for horizontal drainage pipes 3 inches or less in
diameter?
A. 1/16 inch per foot
,B. 1/8 inch per foot
C. 1/4 inch per foot
D. 3/8 inch per foot
E. 1/2 inch per foot
✔ CORRECT ANSWER: C. 1/4 inch per foot
RATIONALE: The standard minimum slope for horizontal drainage pipes 3 inches
and under in diameter is 1/4 inch per foot (2% grade). This ensures adequate flow
velocity to carry waste and prevent solids from settling in the pipe.
QUESTION 5
What device is required on a water heater to prevent excessive pressure buildup?
A. Pressure gauge
B. Ball valve
C. Vacuum breaker
D. Check valve
E. Temperature and Pressure Relief (T&P) valve
✔ CORRECT ANSWER: E. Temperature and Pressure Relief (T&P) valve
RATIONALE: A T&P relief valve is a mandatory safety device on all water heaters.
It automatically releases water if temperature exceeds 210°F or pressure exceeds 150
psi, preventing tank rupture or explosion.
QUESTION 6
What is the minimum diameter of a building sewer serving a single-family home?
A. 2 inches
, B. 2.5 inches
C. 3 inches
D. 4 inches
E. 6 inches
✔ CORRECT ANSWER: C. 3 inches
RATIONALE: Most plumbing codes require a minimum 3-inch diameter for a
building sewer in a single-family residence. However, many jurisdictions and Maine's
code typically require 4 inches. The minimum acceptable is 3 inches per the base code.
QUESTION 7
What is the purpose of a P-trap in a plumbing system?
A. To increase water pressure
B. To filter debris from drain lines
C. To hold water and prevent sewer gases from entering the building
D. To reduce water velocity
E. To connect two different pipe sizes
✔ CORRECT ANSWER: C. To hold water and prevent sewer gases from entering
the building
RATIONALE: A P-trap maintains a water seal that blocks toxic and flammable
sewer gases such as hydrogen sulfide and methane from entering living spaces. This
seal must always be maintained through proper venting.
QUESTION 8
Which venting method allows multiple fixtures to share a single vent pipe?
TO 15GPH | COMPLETE QUESTIONS &
VERIFIED ANSWERS | 100% GUARANTEED
PASS
MAINE STATE JOURNEYMAN EXAM 2026 – UP TO 15 GPH
COMPLETE QUESTIONS & VERIFIED ANSWERS | 100% GUARANTEED PASS
QUESTION 1
What is the maximum allowable water heater temperature setting to prevent scalding in
residential installations?
A. 100°F
B. 110°F
C. 120°F
D. 130°F
E. 140°F
✔ CORRECT ANSWER: C. 120°F
RATIONALE: The maximum recommended water heater temperature for
residential use is 120°F to prevent scalding injuries, particularly for children and the
elderly. This is the standard set by most plumbing codes.
QUESTION 2
Which type of pipe is NOT permitted for use in gas supply lines inside a residential
building?
A. Black steel pipe
B. CSST (Corrugated Stainless Steel Tubing)
C. Copper tubing (where approved)
,D. PVC pipe
E. Schedule 40 steel pipe
✔ CORRECT ANSWER: D. PVC pipe
RATIONALE: PVC pipe is not approved for gas supply lines because it is not
designed to handle the pressures and chemical properties of natural gas or propane.
Only metallic piping systems or approved CSST are used for gas lines.
QUESTION 3
A journeyman plumber in Maine is required to have how many years of experience
before applying for licensure?
A. 1 year
B. 2 years
C. 3 years
D. 4 years
E. 5 years
✔ CORRECT ANSWER: D. 4 years
RATIONALE: Maine requires a minimum of 4 years of documented plumbing
experience under a licensed master plumber before a candidate is eligible to sit for the
journeyman plumbing examination.
QUESTION 4
What is the minimum slope required for horizontal drainage pipes 3 inches or less in
diameter?
A. 1/16 inch per foot
,B. 1/8 inch per foot
C. 1/4 inch per foot
D. 3/8 inch per foot
E. 1/2 inch per foot
✔ CORRECT ANSWER: C. 1/4 inch per foot
RATIONALE: The standard minimum slope for horizontal drainage pipes 3 inches
and under in diameter is 1/4 inch per foot (2% grade). This ensures adequate flow
velocity to carry waste and prevent solids from settling in the pipe.
QUESTION 5
What device is required on a water heater to prevent excessive pressure buildup?
A. Pressure gauge
B. Ball valve
C. Vacuum breaker
D. Check valve
E. Temperature and Pressure Relief (T&P) valve
✔ CORRECT ANSWER: E. Temperature and Pressure Relief (T&P) valve
RATIONALE: A T&P relief valve is a mandatory safety device on all water heaters.
It automatically releases water if temperature exceeds 210°F or pressure exceeds 150
psi, preventing tank rupture or explosion.
QUESTION 6
What is the minimum diameter of a building sewer serving a single-family home?
A. 2 inches
, B. 2.5 inches
C. 3 inches
D. 4 inches
E. 6 inches
✔ CORRECT ANSWER: C. 3 inches
RATIONALE: Most plumbing codes require a minimum 3-inch diameter for a
building sewer in a single-family residence. However, many jurisdictions and Maine's
code typically require 4 inches. The minimum acceptable is 3 inches per the base code.
QUESTION 7
What is the purpose of a P-trap in a plumbing system?
A. To increase water pressure
B. To filter debris from drain lines
C. To hold water and prevent sewer gases from entering the building
D. To reduce water velocity
E. To connect two different pipe sizes
✔ CORRECT ANSWER: C. To hold water and prevent sewer gases from entering
the building
RATIONALE: A P-trap maintains a water seal that blocks toxic and flammable
sewer gases such as hydrogen sulfide and methane from entering living spaces. This
seal must always be maintained through proper venting.
QUESTION 8
Which venting method allows multiple fixtures to share a single vent pipe?
