Kentucky Certified Septic System
Installer Exam With Actual Questions
& Verified Answers,Plus
Rationales/Expert Verified For
Guaranteed Pass 2025/2026 /Latest
Update/Instant Download Pdf
1. Which type of soil is most suitable for a conventional septic system drain field?
A. Clay
B. Sandy loam
C. Rocky soil
D. Peat
Answer: B. Sandy loam
Rationale: Sandy loam provides good drainage while retaining enough moisture for bacterial
activity, making it ideal for septic systems.
2. What is the minimum distance a septic tank must be from a drinking water well in
Kentucky?
A. 50 feet
B. 100 feet
C. 150 feet
D. 200 feet
Answer: B. 100 feet
Rationale: Kentucky regulations require septic tanks to be at least 100 feet from a well to
prevent contamination of the water supply.
3. What is the primary function of a septic tank?
A. To filter solids from wastewater
B. To treat wastewater chemically
C. To aerate wastewater
D. To remove nutrients from wastewater
,Answer: A. To filter solids from wastewater
Rationale: The septic tank separates solids from liquids, allowing the effluent to flow to the
drain field for further treatment.
4. What is the recommended minimum liquid depth in a septic tank?
A. 24 inches
B. 36 inches
C. 48 inches
D. 60 inches
Answer: B. 36 inches
Rationale: A minimum liquid depth of 36 inches ensures adequate retention time for solids to
settle and scum to float.
5. Which type of septic system is best suited for areas with high water tables?
A. Conventional trench system
B. Mound system
C. Gravity-fed system
D. Lagoon system
Answer: B. Mound system
Rationale: Mound systems elevate the drain field above the natural soil, preventing
contamination when the water table is high.
6. How often should a septic tank typically be pumped?
A. Every year
B. Every 2–3 years
C. Every 5–7 years
D. Every 10 years
Answer: B. Every 2–3 years
Rationale: Regular pumping prevents solids from accumulating and clogging the drain field,
ensuring proper system function.
7. What is the primary cause of septic system failure?
A. Excessive water use
B. Tree roots in the tank
C. Improper soil type
D. All of the above
Answer: D. All of the above
Rationale: Septic failure can result from excessive water, tree root intrusion, or unsuitable
soil, all of which can disrupt system operation.
8. What is the minimum slope recommended for septic drain lines in Kentucky?
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: A slope of 1/4 inch per foot ensures proper flow of effluent without causing solids
to settle in the pipes.
9. Which component prevents solids from leaving the septic tank and entering the drain
field?
A. Baffle
B. Pump
C. Filter
D. Vent
Answer: C. Filter
Rationale: A septic tank effluent filter traps solids, protecting the drain field from clogging.
10. In Kentucky, what is the minimum distance a septic system must be from a property
line?
A. 5 feet
B. 10 feet
C. 20 feet
D. 25 feet
Answer: B. 10 feet
Rationale: Regulations require septic systems to be at least 10 feet from property lines to
prevent potential contamination.
11. Which factor is most important in determining the size of a septic tank?
A. Soil type
B. Household water usage
C. Depth to bedrock
D. Slope of the land
Answer: B. Household water usage
Rationale: Septic tank size is primarily based on the volume of wastewater generated to
allow sufficient retention time for settling.
12. What is the purpose of a distribution box in a septic system?
A. To pump wastewater to the tank
B. To distribute effluent evenly to the drain field
C. To filter solids
D. To monitor groundwater levels
Installer Exam With Actual Questions
& Verified Answers,Plus
Rationales/Expert Verified For
Guaranteed Pass 2025/2026 /Latest
Update/Instant Download Pdf
1. Which type of soil is most suitable for a conventional septic system drain field?
A. Clay
B. Sandy loam
C. Rocky soil
D. Peat
Answer: B. Sandy loam
Rationale: Sandy loam provides good drainage while retaining enough moisture for bacterial
activity, making it ideal for septic systems.
2. What is the minimum distance a septic tank must be from a drinking water well in
Kentucky?
A. 50 feet
B. 100 feet
C. 150 feet
D. 200 feet
Answer: B. 100 feet
Rationale: Kentucky regulations require septic tanks to be at least 100 feet from a well to
prevent contamination of the water supply.
3. What is the primary function of a septic tank?
A. To filter solids from wastewater
B. To treat wastewater chemically
C. To aerate wastewater
D. To remove nutrients from wastewater
,Answer: A. To filter solids from wastewater
Rationale: The septic tank separates solids from liquids, allowing the effluent to flow to the
drain field for further treatment.
4. What is the recommended minimum liquid depth in a septic tank?
A. 24 inches
B. 36 inches
C. 48 inches
D. 60 inches
Answer: B. 36 inches
Rationale: A minimum liquid depth of 36 inches ensures adequate retention time for solids to
settle and scum to float.
5. Which type of septic system is best suited for areas with high water tables?
A. Conventional trench system
B. Mound system
C. Gravity-fed system
D. Lagoon system
Answer: B. Mound system
Rationale: Mound systems elevate the drain field above the natural soil, preventing
contamination when the water table is high.
6. How often should a septic tank typically be pumped?
A. Every year
B. Every 2–3 years
C. Every 5–7 years
D. Every 10 years
Answer: B. Every 2–3 years
Rationale: Regular pumping prevents solids from accumulating and clogging the drain field,
ensuring proper system function.
7. What is the primary cause of septic system failure?
A. Excessive water use
B. Tree roots in the tank
C. Improper soil type
D. All of the above
Answer: D. All of the above
Rationale: Septic failure can result from excessive water, tree root intrusion, or unsuitable
soil, all of which can disrupt system operation.
8. What is the minimum slope recommended for septic drain lines in Kentucky?
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: A slope of 1/4 inch per foot ensures proper flow of effluent without causing solids
to settle in the pipes.
9. Which component prevents solids from leaving the septic tank and entering the drain
field?
A. Baffle
B. Pump
C. Filter
D. Vent
Answer: C. Filter
Rationale: A septic tank effluent filter traps solids, protecting the drain field from clogging.
10. In Kentucky, what is the minimum distance a septic system must be from a property
line?
A. 5 feet
B. 10 feet
C. 20 feet
D. 25 feet
Answer: B. 10 feet
Rationale: Regulations require septic systems to be at least 10 feet from property lines to
prevent potential contamination.
11. Which factor is most important in determining the size of a septic tank?
A. Soil type
B. Household water usage
C. Depth to bedrock
D. Slope of the land
Answer: B. Household water usage
Rationale: Septic tank size is primarily based on the volume of wastewater generated to
allow sufficient retention time for settling.
12. What is the purpose of a distribution box in a septic system?
A. To pump wastewater to the tank
B. To distribute effluent evenly to the drain field
C. To filter solids
D. To monitor groundwater levels
