Kentucky Certified Septic System Installer Exam | Kentucky Septic Installer
Certification Study Guide & Exam Prep 2026–2027 | Kentucky Certified Septic System
Installer Test Review | Kentucky On-Site Sewage Disposal System Installer, Septic
System Regulations, 902 KAR 10:140, 902 KAR 10:085, Onsite Sewage Disposal
Systems, Septic Tank Installation, Soil Evaluation, Soil Classification, Percolation
Testing, Site Evaluation, System Design, System Sizing, Hydraulic Loading, Drainfield
Design, Soil Treatment & Dispersal Systems, Conventional Septic Systems,
Alternative Septic Systems, Septic Tank Components, Distribution Systems,
Installation Standards, Setbacks, Permitting, Inspections, Maintenance,
Troubleshooting, Environmental Health & Safety, Kentucky Public Health Regulations |
Practice Questions, Scenario-Based Review & Detailed Rationales
Question 1: Under Kentucky certification standards, which level is limited to
residential on-site systems utilizing gravity distribution, rock-filled trenches,
leaching chambers, or evaporation-absorption lagoons?
A. Full level
B. Advanced level
C. Provisional or probationary level
D. Master level
CORRECT ANSWER: C. Provisional or probationary level
Rationale: Kentucky regulation 902 KAR 10:140 Section 3(1) explicitly states that
provisional or probationary certification is limited to residential systems using
gravity distribution, rock-filled trenches or beds, leaching chamber trenches or
beds, or evaporation-absorption lagoons.
Question 2: A certified installer at the full level wishes to advance to advanced
certification. According to Kentucky regulation, what prerequisite status must
be continuously maintained?
A. Master level status
B. Advanced level status
C. Full level status in good standing
D. Provisional status only
CORRECT ANSWER: C. Full level status in good standing
,Rationale: 902 KAR 10:140 Section 2(5)(a) requires that a person seeking
advanced level certification shall have continuously maintained full level status in
good standing.
Question 3: What is the minimum number of continuing education units
required annually for a Kentucky installer holding provisional, probationary, full,
or advanced certification?
A. 3 CEUs
B. 6 CEUs
C. 9 CEUs
D. 12 CEUs
CORRECT ANSWER: B. 6 CEUs
Rationale: Section 4(3)(a) of 902 KAR 10:140 specifies that for provisional,
probationary, full, and advanced certification levels, a minimum of two training
workshops totaling six approved continuing education units per year is required.
Question 4: How frequently must a Kentucky certified installer at the master
level complete continuing education requirements?
A. Every year
B. Every two years
C. Every three years
D. Every five years
CORRECT ANSWER: B. Every two years
Rationale: 902 KAR 10:140 Section 4(3)(b) establishes that master level installers
need a minimum of six continuing education units every two years, rather than
annually.
Question 5: In Kentucky, soil depth from existing ground surface to bedrock of
what minimum depth is considered SUITABLE?
A. 18 inches
B. 24 inches
C. 36 inches
D. 42 inches
,CORRECT ANSWER: D. 42 inches
Rationale: Kentucky regulation 902 KAR 10:085 states that soil depths forty-two
(42) inches or greater shall be considered SUITABLE as to depth.
Question 6: Soil depths less than 24 inches in Kentucky are classified as which of
the following?
A. SUITABLE
B. PROVISIONALLY SUITABLE
C. UNSUITABLE
D. Conditionally SUITABLE
CORRECT ANSWER: C. UNSUITABLE
Rationale: According to 902 KAR 10:085, soil depths less than twenty-four (24)
inches shall be classified UNSUITABLE as to depth, unless special modifications
provide at least 18 inches of undisturbed naturally occurring soil.
Question 7: What is the minimum separation distance required between the
bottom of a lateral field and a restrictive horizon for a system to be considered
PROVISIONALLY SUITABLE due to shallow depth?
A. 12 inches
B. 15 inches
C. 18 inches
D. 24 inches
CORRECT ANSWER: C. 18 inches
Rationale: 902 KAR 10:085 provides that if special system design and installation
modifications can provide at least eighteen (18) inches of undisturbed naturally
occurring soil between the bottom of the lateral field and the restrictive horizon,
the soils may be reclassified PROVISIONALLY SUITABLE.
Question 8: In Kentucky, what is the maximum trench or bed depth from grade
for an on-site sewage treatment and dispersal system?
A. 18 inches
B. 24 inches
, C. 30 inches
D. 36 inches
CORRECT ANSWER: B. 24 inches
Rationale: Kentucky regulation states that maximum trench or bed depth from
grade for an on-site sewage treatment and dispersal system shall be twenty-four
(24) inches.
Question 9: What is the minimum trench or bed depth from grade for modified
gravity and dosed gravity distribution systems in Kentucky?
A. 3 inches
B. 6 inches
C. 9 inches
D. 12 inches
CORRECT ANSWER: B. 6 inches
Rationale: The regulation specifies that minimum trench or bed depth for
modified gravity and dosed gravity distribution systems shall be six (6) inches
from grade.
Question 10: For low pressure pipe (LPP) systems in Kentucky, what is the
minimum trench width?
A. 6 inches
B. 9 inches
C. 12 inches
D. 18 inches
CORRECT ANSWER: C. 12 inches
Rationale: Kentucky regulation 902 KAR 10:081 mandates that trench width for
LPP systems shall be a minimum of twelve (12) inches.
Question 11: What is the minimum trench width for gravelless pipe in
Kentucky?
A. 12 inches
B. 15 inches
Certification Study Guide & Exam Prep 2026–2027 | Kentucky Certified Septic System
Installer Test Review | Kentucky On-Site Sewage Disposal System Installer, Septic
System Regulations, 902 KAR 10:140, 902 KAR 10:085, Onsite Sewage Disposal
Systems, Septic Tank Installation, Soil Evaluation, Soil Classification, Percolation
Testing, Site Evaluation, System Design, System Sizing, Hydraulic Loading, Drainfield
Design, Soil Treatment & Dispersal Systems, Conventional Septic Systems,
Alternative Septic Systems, Septic Tank Components, Distribution Systems,
Installation Standards, Setbacks, Permitting, Inspections, Maintenance,
Troubleshooting, Environmental Health & Safety, Kentucky Public Health Regulations |
Practice Questions, Scenario-Based Review & Detailed Rationales
Question 1: Under Kentucky certification standards, which level is limited to
residential on-site systems utilizing gravity distribution, rock-filled trenches,
leaching chambers, or evaporation-absorption lagoons?
A. Full level
B. Advanced level
C. Provisional or probationary level
D. Master level
CORRECT ANSWER: C. Provisional or probationary level
Rationale: Kentucky regulation 902 KAR 10:140 Section 3(1) explicitly states that
provisional or probationary certification is limited to residential systems using
gravity distribution, rock-filled trenches or beds, leaching chamber trenches or
beds, or evaporation-absorption lagoons.
Question 2: A certified installer at the full level wishes to advance to advanced
certification. According to Kentucky regulation, what prerequisite status must
be continuously maintained?
A. Master level status
B. Advanced level status
C. Full level status in good standing
D. Provisional status only
CORRECT ANSWER: C. Full level status in good standing
,Rationale: 902 KAR 10:140 Section 2(5)(a) requires that a person seeking
advanced level certification shall have continuously maintained full level status in
good standing.
Question 3: What is the minimum number of continuing education units
required annually for a Kentucky installer holding provisional, probationary, full,
or advanced certification?
A. 3 CEUs
B. 6 CEUs
C. 9 CEUs
D. 12 CEUs
CORRECT ANSWER: B. 6 CEUs
Rationale: Section 4(3)(a) of 902 KAR 10:140 specifies that for provisional,
probationary, full, and advanced certification levels, a minimum of two training
workshops totaling six approved continuing education units per year is required.
Question 4: How frequently must a Kentucky certified installer at the master
level complete continuing education requirements?
A. Every year
B. Every two years
C. Every three years
D. Every five years
CORRECT ANSWER: B. Every two years
Rationale: 902 KAR 10:140 Section 4(3)(b) establishes that master level installers
need a minimum of six continuing education units every two years, rather than
annually.
Question 5: In Kentucky, soil depth from existing ground surface to bedrock of
what minimum depth is considered SUITABLE?
A. 18 inches
B. 24 inches
C. 36 inches
D. 42 inches
,CORRECT ANSWER: D. 42 inches
Rationale: Kentucky regulation 902 KAR 10:085 states that soil depths forty-two
(42) inches or greater shall be considered SUITABLE as to depth.
Question 6: Soil depths less than 24 inches in Kentucky are classified as which of
the following?
A. SUITABLE
B. PROVISIONALLY SUITABLE
C. UNSUITABLE
D. Conditionally SUITABLE
CORRECT ANSWER: C. UNSUITABLE
Rationale: According to 902 KAR 10:085, soil depths less than twenty-four (24)
inches shall be classified UNSUITABLE as to depth, unless special modifications
provide at least 18 inches of undisturbed naturally occurring soil.
Question 7: What is the minimum separation distance required between the
bottom of a lateral field and a restrictive horizon for a system to be considered
PROVISIONALLY SUITABLE due to shallow depth?
A. 12 inches
B. 15 inches
C. 18 inches
D. 24 inches
CORRECT ANSWER: C. 18 inches
Rationale: 902 KAR 10:085 provides that if special system design and installation
modifications can provide at least eighteen (18) inches of undisturbed naturally
occurring soil between the bottom of the lateral field and the restrictive horizon,
the soils may be reclassified PROVISIONALLY SUITABLE.
Question 8: In Kentucky, what is the maximum trench or bed depth from grade
for an on-site sewage treatment and dispersal system?
A. 18 inches
B. 24 inches
, C. 30 inches
D. 36 inches
CORRECT ANSWER: B. 24 inches
Rationale: Kentucky regulation states that maximum trench or bed depth from
grade for an on-site sewage treatment and dispersal system shall be twenty-four
(24) inches.
Question 9: What is the minimum trench or bed depth from grade for modified
gravity and dosed gravity distribution systems in Kentucky?
A. 3 inches
B. 6 inches
C. 9 inches
D. 12 inches
CORRECT ANSWER: B. 6 inches
Rationale: The regulation specifies that minimum trench or bed depth for
modified gravity and dosed gravity distribution systems shall be six (6) inches
from grade.
Question 10: For low pressure pipe (LPP) systems in Kentucky, what is the
minimum trench width?
A. 6 inches
B. 9 inches
C. 12 inches
D. 18 inches
CORRECT ANSWER: C. 12 inches
Rationale: Kentucky regulation 902 KAR 10:081 mandates that trench width for
LPP systems shall be a minimum of twelve (12) inches.
Question 11: What is the minimum trench width for gravelless pipe in
Kentucky?
A. 12 inches
B. 15 inches
