Kentucky Certified Septic System Installer Exam
2026 – Newest Verified Q&A | 902 KAR 10:081
Study Guide | Graded A+ Prep
Batch 1: Site Evaluation, Setbacks, and Tank Standards
1. Under Kentucky regulation 902 KAR 10:081, what is the minimum required distance
between a lateral field and a property line?
A) 2 feet
B) 5 feet
C) 10 feet
D) 15 feet
Answer: B) 5 feet
Explanation: Kentucky law requires a minimum 5-foot setback from property lines to
ensure that effluent remains on the permitted property.
2. What is the minimum required horizontal distance between a septic tank and a water
well?
A) 25 feet
B) 50 feet
C) 75 feet
D) 100 feet
Answer: B) 50 feet
Explanation: To prevent groundwater contamination of drinking water sources, a 50-
foot minimum distance is required.
3. A septic tank must be located at least how many feet from a dwelling or occupied
building?
A) 5 feet
B) 10 feet
C) 20 feet
D) 25 feet
Answer: B) 10 feet
, Explanation: This distance prevents structural interference and protects the foundation
from potential moisture issues.
4. What is the standard minimum capacity for a septic tank serving a 3-bedroom home in
Kentucky?
A) 750 gallons
B) 1,000 gallons
C) 1,250 gallons
D) 1,500 gallons
Answer: B) 1,000 gallons
Explanation: For a standard residential home (up to 3 bedrooms), a 1,000-gallon tank
is the baseline requirement.
5. When installing a distribution box (D-box), it must be placed on:
A) Loose soil to allow for settling
B) A level base of concrete, stable rock, or undisturbed soil
C) A slight incline toward the lateral lines
D) Gravel at least 12 inches deep
Answer: B) A level base of concrete, stable rock, or undisturbed soil
Explanation: Stability and levelness are critical for a D-box to ensure even distribution
of effluent to all lateral lines.
6. In Kentucky, "Limiting Layers" in soil evaluation refer to:
A) The layer where grass grows
B) Bedrock, high water tables, or restrictive clay layers (fragipan)
C) The depth of the septic tank
D) Layers of sand and gravel
Answer: B) Bedrock, high water tables, or restrictive clay layers (fragipan)
Explanation: Limiting layers prevent the proper downward filtration and treatment of
sewage effluent.
7. What color is the "soil tag" or permit that must be posted at the job site?
A) White
B) Yellow (or Orange depending on the health department)
C) Blue
D) Pink
Answer: B) Yellow/Orange
Explanation: Most Kentucky counties use high-visibility yellow or orange permit cards
that must remain visible throughout the installation.
, 8. When backfilling a septic tank, what is the maximum recommended depth of the soil
cover over the top of the tank without reinforcement?
A) 12 inches
B) 24 inches (2 feet)
C) 48 inches (4 feet)
D) 6 inches
Answer: B) 24 inches
Explanation: Standard concrete tanks are usually rated for 2 feet of cover; deeper
burials require heavy-duty reinforced tanks to prevent collapse.
9. A certified installer must maintain a surety bond in the amount of:
A) $1,000
B) $2,500
C) $5,000
D) $10,000
Answer: C) $5,000
Explanation: A $5,000 bond is a mandatory legal requirement for maintaining
certification in Kentucky.
10. What is the minimum length of a single lateral line in a standard gravity system?
A) 20 feet
B) 40 feet
C) There is no minimum, but maximum is usually 100 feet
D) 150 feet
Answer: C) There is no minimum, but maximum is usually 100 feet
Explanation: While there is no specific minimum length, Kentucky caps single lines at
100 feet to prevent "end-loading" and ensure even absorption.
11. Which tool is used by an environmentalist to determine soil texture?
A) A thermometer
B) A soil probe or auger
C) A level
D) A transit
Answer: B) A soil probe or auger
Explanation: Probes allow the environmentalist to extract samples from varying depths
to check for color and texture.
12. The "Inlet" of a septic tank must be how much higher than the "Outlet"?
A) 1 inch
B) 2 to 3 inches
2026 – Newest Verified Q&A | 902 KAR 10:081
Study Guide | Graded A+ Prep
Batch 1: Site Evaluation, Setbacks, and Tank Standards
1. Under Kentucky regulation 902 KAR 10:081, what is the minimum required distance
between a lateral field and a property line?
A) 2 feet
B) 5 feet
C) 10 feet
D) 15 feet
Answer: B) 5 feet
Explanation: Kentucky law requires a minimum 5-foot setback from property lines to
ensure that effluent remains on the permitted property.
2. What is the minimum required horizontal distance between a septic tank and a water
well?
A) 25 feet
B) 50 feet
C) 75 feet
D) 100 feet
Answer: B) 50 feet
Explanation: To prevent groundwater contamination of drinking water sources, a 50-
foot minimum distance is required.
3. A septic tank must be located at least how many feet from a dwelling or occupied
building?
A) 5 feet
B) 10 feet
C) 20 feet
D) 25 feet
Answer: B) 10 feet
, Explanation: This distance prevents structural interference and protects the foundation
from potential moisture issues.
4. What is the standard minimum capacity for a septic tank serving a 3-bedroom home in
Kentucky?
A) 750 gallons
B) 1,000 gallons
C) 1,250 gallons
D) 1,500 gallons
Answer: B) 1,000 gallons
Explanation: For a standard residential home (up to 3 bedrooms), a 1,000-gallon tank
is the baseline requirement.
5. When installing a distribution box (D-box), it must be placed on:
A) Loose soil to allow for settling
B) A level base of concrete, stable rock, or undisturbed soil
C) A slight incline toward the lateral lines
D) Gravel at least 12 inches deep
Answer: B) A level base of concrete, stable rock, or undisturbed soil
Explanation: Stability and levelness are critical for a D-box to ensure even distribution
of effluent to all lateral lines.
6. In Kentucky, "Limiting Layers" in soil evaluation refer to:
A) The layer where grass grows
B) Bedrock, high water tables, or restrictive clay layers (fragipan)
C) The depth of the septic tank
D) Layers of sand and gravel
Answer: B) Bedrock, high water tables, or restrictive clay layers (fragipan)
Explanation: Limiting layers prevent the proper downward filtration and treatment of
sewage effluent.
7. What color is the "soil tag" or permit that must be posted at the job site?
A) White
B) Yellow (or Orange depending on the health department)
C) Blue
D) Pink
Answer: B) Yellow/Orange
Explanation: Most Kentucky counties use high-visibility yellow or orange permit cards
that must remain visible throughout the installation.
, 8. When backfilling a septic tank, what is the maximum recommended depth of the soil
cover over the top of the tank without reinforcement?
A) 12 inches
B) 24 inches (2 feet)
C) 48 inches (4 feet)
D) 6 inches
Answer: B) 24 inches
Explanation: Standard concrete tanks are usually rated for 2 feet of cover; deeper
burials require heavy-duty reinforced tanks to prevent collapse.
9. A certified installer must maintain a surety bond in the amount of:
A) $1,000
B) $2,500
C) $5,000
D) $10,000
Answer: C) $5,000
Explanation: A $5,000 bond is a mandatory legal requirement for maintaining
certification in Kentucky.
10. What is the minimum length of a single lateral line in a standard gravity system?
A) 20 feet
B) 40 feet
C) There is no minimum, but maximum is usually 100 feet
D) 150 feet
Answer: C) There is no minimum, but maximum is usually 100 feet
Explanation: While there is no specific minimum length, Kentucky caps single lines at
100 feet to prevent "end-loading" and ensure even absorption.
11. Which tool is used by an environmentalist to determine soil texture?
A) A thermometer
B) A soil probe or auger
C) A level
D) A transit
Answer: B) A soil probe or auger
Explanation: Probes allow the environmentalist to extract samples from varying depths
to check for color and texture.
12. The "Inlet" of a septic tank must be how much higher than the "Outlet"?
A) 1 inch
B) 2 to 3 inches
