KENTUCKY MASTER PLUMBER NEWEST EXAM WITH
COMPLETE QUESTIONS AND CORRECT DETAILED
ANSWERS PLUS RATIONALES (VERIFIED 100%)
ALREADY GRADED A+ || BRAND NEW!!! 2026 LATEST
UPDATE
Q1: According to KRS Chapter 318, which entity issues a master plumber license in Kentucky?
A) Kentucky State Board of Plumbing
B) Kentucky Department of Housing, Buildings and Construction
C) Local County Building Inspector
D) Kentucky Board of Contractors
Answer: B
Rationale: The Kentucky Department of Housing, Buildings and Construction (DHBC) is the state agency
that administers licensing for plumbers, including master plumbers. KRS Chapter 318 designates DHBC
as the regulatory authority for plumbing licenses in Kentucky.
Q2: What is the minimum required water service pipe size for a single-family dwelling in Kentucky?
A) 1/2 inch
B) 3/4 inch
C) 1 inch
D) 1-1/4 inch
Answer: B
Rationale: Kentucky code requires a minimum 3/4-inch pipe for water service to ensure adequate flow
and pressure to all fixtures in a single-family residence. This is a commonly tested code requirement for
residential water supply systems.
Q3: Under KRS 318.020, how many journeyman plumbers may a master plumber supervise on a single
project without additional permits?
A) One
B) Two
C) Three
1|Page SUCCESS!!!
,D) Unlimited
Answer: D
Rationale: KRS 318.020 permits a master plumber to supervise an unlimited number of journeyman
plumbers, provided the work complies with all applicable codes and permits. This reflects the master
plumber's role as the responsible party for all work performed under their supervision.
Q4: According to Kentucky law, who is responsible for ensuring that plumbing work is inspected before
being concealed?
A) The property owner
B) The master plumber in charge
C) The building inspector
D) The general contractor
Answer: B
Rationale: The master plumber is legally responsible for scheduling and ensuring required inspections
before any plumbing work is concealed. This is a key supervisory responsibility of the master plumber
under Kentucky law.
Q5: What is the maximum allowable distance between cleanouts in a horizontal drainage pipe per
Kentucky Plumbing Code?
A) 25 feet
B) 50 feet
C) 75 feet
D) 100 feet
Answer: C
Rationale: Cleanouts must be installed at intervals not exceeding 75 feet to allow for proper maintenance
and clearing of blockages. This requirement ensures accessibility for cleaning and inspection of horizontal
drainage systems.
Q6: Which of the following piping materials is NOT permitted for underground water service according
to Kentucky regulations?
A) Type K copper
B) PVC
C) CPVC
2|Page SUCCESS!!!
,D) Galvanized steel
Answer: D
Rationale: Galvanized steel is not permitted for underground water service due to its susceptibility to
corrosion. Type K copper, PVC, and CPVC are approved materials for underground water service in
Kentucky.
Q7: Under 815 KAR 20‑410, a master plumber must obtain a permit before which activity?
A) Purchasing plumbing materials
B) Performing a routine faucet repair in an occupied residence
C) Installing a new sanitary drainage system in a commercial building
D) Conducting a backflow test on a residential property
Answer: C
Rationale: New installations of sanitary drainage systems require a permit; routine repairs and testing do
not. The permit requirement applies to new construction and alterations, not to routine maintenance or
testing activities.
Q8: What is the minimum slope required for a horizontal wastewater pipe of 4-inch diameter serving a
residential building?
A) 0.5%
B) 1%
C) 2%
D) 3%
Answer: B
Rationale: The Kentucky Plumbing Code requires a minimum slope of 1% (1/8 inch per foot) for
horizontal waste pipes of 4 inches or larger. This slope ensures proper drainage and prevents solids from
settling in the pipe.
Q9: What is the minimum water pressure required at fixture outlets in residential buildings?
A) 20 psi
B) 30 psi
C) 40 psi
D) 50 psi
3|Page SUCCESS!!!
, Answer: B
Rationale: The IPC requires a minimum water pressure of 30 psi at fixture outlets to ensure adequate flow
for proper fixture operation. This ensures that all fixtures receive sufficient pressure for effective function.
Q10: Which statute defines the term "master plumber" in Kentucky?
A) KRS 318.020
B) KRS 318.100
C) KRS 815.050
D) KRS 318.040
Answer: A
Rationale: KRS 318.020 specifically defines the term "master plumber" in Kentucky law. This statute
establishes the legal definition and scope of practice for master plumbers in the state.
Q11: What is the exam fee for a Kentucky Master Plumber license examination?
A) $50
B) $100
C) $150
D) $250
Answer: C
Rationale: The examination fee for a master plumber license is $150, while the journeyman examination
fee is $50. This fee is non-refundable and must accompany the examination application.
Q12: A vent pipe serving a group of fixtures must be sized based on the total fixture units. How many
drainage fixture units (DFUs) are assigned to a standard water closet in the Kentucky code?
A) 2
B) 3
C) 4
D) 6
Answer: C
Rationale: The Kentucky code assigns 6.0 fixture units to a standard water closet for sizing supply and
vent lines. This DFU value is used in calculating required pipe sizes for drainage and vent systems.
4|Page SUCCESS!!!
COMPLETE QUESTIONS AND CORRECT DETAILED
ANSWERS PLUS RATIONALES (VERIFIED 100%)
ALREADY GRADED A+ || BRAND NEW!!! 2026 LATEST
UPDATE
Q1: According to KRS Chapter 318, which entity issues a master plumber license in Kentucky?
A) Kentucky State Board of Plumbing
B) Kentucky Department of Housing, Buildings and Construction
C) Local County Building Inspector
D) Kentucky Board of Contractors
Answer: B
Rationale: The Kentucky Department of Housing, Buildings and Construction (DHBC) is the state agency
that administers licensing for plumbers, including master plumbers. KRS Chapter 318 designates DHBC
as the regulatory authority for plumbing licenses in Kentucky.
Q2: What is the minimum required water service pipe size for a single-family dwelling in Kentucky?
A) 1/2 inch
B) 3/4 inch
C) 1 inch
D) 1-1/4 inch
Answer: B
Rationale: Kentucky code requires a minimum 3/4-inch pipe for water service to ensure adequate flow
and pressure to all fixtures in a single-family residence. This is a commonly tested code requirement for
residential water supply systems.
Q3: Under KRS 318.020, how many journeyman plumbers may a master plumber supervise on a single
project without additional permits?
A) One
B) Two
C) Three
1|Page SUCCESS!!!
,D) Unlimited
Answer: D
Rationale: KRS 318.020 permits a master plumber to supervise an unlimited number of journeyman
plumbers, provided the work complies with all applicable codes and permits. This reflects the master
plumber's role as the responsible party for all work performed under their supervision.
Q4: According to Kentucky law, who is responsible for ensuring that plumbing work is inspected before
being concealed?
A) The property owner
B) The master plumber in charge
C) The building inspector
D) The general contractor
Answer: B
Rationale: The master plumber is legally responsible for scheduling and ensuring required inspections
before any plumbing work is concealed. This is a key supervisory responsibility of the master plumber
under Kentucky law.
Q5: What is the maximum allowable distance between cleanouts in a horizontal drainage pipe per
Kentucky Plumbing Code?
A) 25 feet
B) 50 feet
C) 75 feet
D) 100 feet
Answer: C
Rationale: Cleanouts must be installed at intervals not exceeding 75 feet to allow for proper maintenance
and clearing of blockages. This requirement ensures accessibility for cleaning and inspection of horizontal
drainage systems.
Q6: Which of the following piping materials is NOT permitted for underground water service according
to Kentucky regulations?
A) Type K copper
B) PVC
C) CPVC
2|Page SUCCESS!!!
,D) Galvanized steel
Answer: D
Rationale: Galvanized steel is not permitted for underground water service due to its susceptibility to
corrosion. Type K copper, PVC, and CPVC are approved materials for underground water service in
Kentucky.
Q7: Under 815 KAR 20‑410, a master plumber must obtain a permit before which activity?
A) Purchasing plumbing materials
B) Performing a routine faucet repair in an occupied residence
C) Installing a new sanitary drainage system in a commercial building
D) Conducting a backflow test on a residential property
Answer: C
Rationale: New installations of sanitary drainage systems require a permit; routine repairs and testing do
not. The permit requirement applies to new construction and alterations, not to routine maintenance or
testing activities.
Q8: What is the minimum slope required for a horizontal wastewater pipe of 4-inch diameter serving a
residential building?
A) 0.5%
B) 1%
C) 2%
D) 3%
Answer: B
Rationale: The Kentucky Plumbing Code requires a minimum slope of 1% (1/8 inch per foot) for
horizontal waste pipes of 4 inches or larger. This slope ensures proper drainage and prevents solids from
settling in the pipe.
Q9: What is the minimum water pressure required at fixture outlets in residential buildings?
A) 20 psi
B) 30 psi
C) 40 psi
D) 50 psi
3|Page SUCCESS!!!
, Answer: B
Rationale: The IPC requires a minimum water pressure of 30 psi at fixture outlets to ensure adequate flow
for proper fixture operation. This ensures that all fixtures receive sufficient pressure for effective function.
Q10: Which statute defines the term "master plumber" in Kentucky?
A) KRS 318.020
B) KRS 318.100
C) KRS 815.050
D) KRS 318.040
Answer: A
Rationale: KRS 318.020 specifically defines the term "master plumber" in Kentucky law. This statute
establishes the legal definition and scope of practice for master plumbers in the state.
Q11: What is the exam fee for a Kentucky Master Plumber license examination?
A) $50
B) $100
C) $150
D) $250
Answer: C
Rationale: The examination fee for a master plumber license is $150, while the journeyman examination
fee is $50. This fee is non-refundable and must accompany the examination application.
Q12: A vent pipe serving a group of fixtures must be sized based on the total fixture units. How many
drainage fixture units (DFUs) are assigned to a standard water closet in the Kentucky code?
A) 2
B) 3
C) 4
D) 6
Answer: C
Rationale: The Kentucky code assigns 6.0 fixture units to a standard water closet for sizing supply and
vent lines. This DFU value is used in calculating required pipe sizes for drainage and vent systems.
4|Page SUCCESS!!!
