ALABAMA PLUMBING CONTRACTOR
LICENSING TEST EXAM 100 QUESTIONS WITH
CORRECT ANSWERS AND RATIONALES
LATEST 2025-2026 UPDATE
1–20: Plumbing Codes and Regulations
1. Which code governs plumbing installation standards in Alabama?
A) International Residential Code (IRC)
B) Alabama State Plumbing Code
C) Uniform Plumbing Code (UPC)
D) National Plumbing Code
Answer: B) Alabama State Plumbing Code
Rationale: Alabama has its own state plumbing code, which must be
followed in all plumbing installations.
2. Who must obtain an Alabama plumbing contractor license?
A) Any person installing plumbing in their home
B) Anyone performing plumbing work for compensation
C) Anyone doing plumbing in public schools only
D) Anyone who installs water heaters
Answer: B) Anyone performing plumbing work for compensation
Rationale: Licensing is required for those offering plumbing services
for hire; private work in one’s own home does not require a license.
3. What is the minimum age to apply for an Alabama plumbing
contractor license?
,A) 18
B) 19
C) 21
D) 25
Answer: C) 21
Rationale: Alabama requires applicants to be at least 21 years old.
4. What type of insurance is required for a licensed plumbing contractor
in Alabama?
A) Health insurance
B) Liability insurance
C) Car insurance
D) None
Answer: B) Liability insurance
Rationale: Contractors must carry liability insurance to protect against
damages during work.
5. How often must an Alabama plumbing license be renewed?
A) Every year
B) Every two years
C) Every three years
D) Every five years
Answer: B) Every two years
Rationale: Alabama requires plumbing licenses to be renewed
biennially.
,6. What is the penalty for unlicensed plumbing work in Alabama?
A) Fine only
B) Jail time only
C) Fine and/or criminal prosecution
D) Warning only
Answer: C) Fine and/or criminal prosecution
Rationale: Performing plumbing work without a license is illegal and
may result in fines or criminal charges.
7. Which of the following materials is not allowed for potable water
piping in Alabama?
A) Copper
B) PVC
C) Lead
D) PEX
Answer: C) Lead
Rationale: Lead pipes are banned due to health hazards; other materials
must be code-approved.
8. Who enforces plumbing codes in Alabama?
A) City or county inspectors
B) State Plumbing Board
C) Fire department
D) Building contractor
Answer: B) State Plumbing Board
Rationale: The Alabama State Board of Health oversees plumbing code
compliance.
, 9. Which fixture requires an air gap or vacuum breaker to prevent
backflow?
A) Kitchen sink
B) Dishwasher
C) Hose bibb
D) Bathtub
Answer: C) Hose bibb
Rationale: Outdoor spigots must have backflow prevention devices to
prevent contamination of potable water.
10. What is the minimum slope for a 2-inch horizontal drain pipe?
A) 1/8 inch per foot
B) 1/4 inch per foot
C) 1/2 inch per foot
D) 1 inch per foot
Answer: B) 1/4 inch per foot
Rationale: Proper slope ensures gravity drainage and prevents clogs.
11. What is the maximum distance a plumbing vent can be from the trap
it serves?
A) 2 feet
B) 4 feet
C) 6 feet
D) 10 feet
Answer: C) 6 feet
Rationale: Alabama plumbing code limits vent distance to ensure
proper drainage and venting.
LICENSING TEST EXAM 100 QUESTIONS WITH
CORRECT ANSWERS AND RATIONALES
LATEST 2025-2026 UPDATE
1–20: Plumbing Codes and Regulations
1. Which code governs plumbing installation standards in Alabama?
A) International Residential Code (IRC)
B) Alabama State Plumbing Code
C) Uniform Plumbing Code (UPC)
D) National Plumbing Code
Answer: B) Alabama State Plumbing Code
Rationale: Alabama has its own state plumbing code, which must be
followed in all plumbing installations.
2. Who must obtain an Alabama plumbing contractor license?
A) Any person installing plumbing in their home
B) Anyone performing plumbing work for compensation
C) Anyone doing plumbing in public schools only
D) Anyone who installs water heaters
Answer: B) Anyone performing plumbing work for compensation
Rationale: Licensing is required for those offering plumbing services
for hire; private work in one’s own home does not require a license.
3. What is the minimum age to apply for an Alabama plumbing
contractor license?
,A) 18
B) 19
C) 21
D) 25
Answer: C) 21
Rationale: Alabama requires applicants to be at least 21 years old.
4. What type of insurance is required for a licensed plumbing contractor
in Alabama?
A) Health insurance
B) Liability insurance
C) Car insurance
D) None
Answer: B) Liability insurance
Rationale: Contractors must carry liability insurance to protect against
damages during work.
5. How often must an Alabama plumbing license be renewed?
A) Every year
B) Every two years
C) Every three years
D) Every five years
Answer: B) Every two years
Rationale: Alabama requires plumbing licenses to be renewed
biennially.
,6. What is the penalty for unlicensed plumbing work in Alabama?
A) Fine only
B) Jail time only
C) Fine and/or criminal prosecution
D) Warning only
Answer: C) Fine and/or criminal prosecution
Rationale: Performing plumbing work without a license is illegal and
may result in fines or criminal charges.
7. Which of the following materials is not allowed for potable water
piping in Alabama?
A) Copper
B) PVC
C) Lead
D) PEX
Answer: C) Lead
Rationale: Lead pipes are banned due to health hazards; other materials
must be code-approved.
8. Who enforces plumbing codes in Alabama?
A) City or county inspectors
B) State Plumbing Board
C) Fire department
D) Building contractor
Answer: B) State Plumbing Board
Rationale: The Alabama State Board of Health oversees plumbing code
compliance.
, 9. Which fixture requires an air gap or vacuum breaker to prevent
backflow?
A) Kitchen sink
B) Dishwasher
C) Hose bibb
D) Bathtub
Answer: C) Hose bibb
Rationale: Outdoor spigots must have backflow prevention devices to
prevent contamination of potable water.
10. What is the minimum slope for a 2-inch horizontal drain pipe?
A) 1/8 inch per foot
B) 1/4 inch per foot
C) 1/2 inch per foot
D) 1 inch per foot
Answer: B) 1/4 inch per foot
Rationale: Proper slope ensures gravity drainage and prevents clogs.
11. What is the maximum distance a plumbing vent can be from the trap
it serves?
A) 2 feet
B) 4 feet
C) 6 feet
D) 10 feet
Answer: C) 6 feet
Rationale: Alabama plumbing code limits vent distance to ensure
proper drainage and venting.
