South Carolina Septic Tank Installer License
Exam Practice Questions & Answers With Rationales —
2026
1. What minimum score is required to pass the South Carolina septic system
installer licensing examination?
A. 60%
B. 70%
C. 75%
D. 80%
Correct Answer: D. 80%
Rationale: South Carolina requires applicants for the septic system installer license to achieve a
score of 80% or better on the required examination.
2. Which agency administers South Carolina's septic system installer licensing
program?
A. South Carolina Department of Transportation
B. South Carolina Department of Environmental Services
C. South Carolina Department of Labor
D. South Carolina Department of Agriculture
Correct Answer: B. South Carolina Department of Environmental Services
Rationale: The South Carolina Department of Environmental Services (SCDES) administers
the onsite wastewater and septic system licensing program.
3. Which regulation is specifically associated with South Carolina onsite
wastewater systems?
A. Regulation 61-15
B. Regulation 61-25
C. Regulation 61-56
D. Regulation 62-10
Correct Answer: C. Regulation 61-56
,Rationale: The installer licensing examination is based on South Carolina Regulation 61-56,
which governs onsite wastewater systems.
4. Which type of systems may a Tier 1 installer generally install?
A. All commercial systems
B. Standard 610 specialized systems
C. Gravity-fed residential systems
D. All systems involving pumps
Correct Answer: C. Gravity-fed residential systems
Rationale: Tier 1 licensing permits installation of gravity-fed residential onsite wastewater
systems within the scope established by Regulation 61-56.
5. Which installer tier includes systems involving pumps?
A. Tier 1
B. Tier 2
C. Tier 3 only
D. Unlicensed installers
Correct Answer: B. Tier 2
Rationale: Tier 2 includes the Tier 1 scope plus additional systems and components, including
pumps, grease traps, curtain drains, elevated infiltration systems, mounded systems, and
commercial systems.
6. Which additional category is specifically associated with Tier 3 licensing?
A. Standard 610 Specialized Onsite Wastewater Systems
B. Residential gravity systems only
C. Septic tank pumping only
D. Plumbing fixture installation
Correct Answer: A. Standard 610 Specialized Onsite Wastewater Systems
Rationale: Tier 3 expands the Tier 1 and Tier 2 scope to include Standard 610 Specialized
Onsite Wastewater Systems.
, 7. How many continuing education units does a Tier 1 installer generally need
every two years?
A. 4 CEUs
B. 6 CEUs
C. 8 CEUs
D. 12 CEUs
Correct Answer: C. 8 CEUs
Rationale: Tier 1 installers are required to complete 8 CEUs every two years under the
licensing program.
8. How many CEUs are required for a Tier 2 installer every two years?
A. 8
B. 10
C. 12
D. 18
Correct Answer: C. 12
Rationale: Tier 2 installers must complete 12 CEUs every two years.
9. How many CEUs are required for Tier 3 installers every two years?
A. 8
B. 10
C. 12
D. 18
Correct Answer: D. 18
Rationale: Tier 3 has the highest continuing education requirement: 18 CEUs every two years.
10. Which requirement applies specifically to a Tier 3 installer?
Exam Practice Questions & Answers With Rationales —
2026
1. What minimum score is required to pass the South Carolina septic system
installer licensing examination?
A. 60%
B. 70%
C. 75%
D. 80%
Correct Answer: D. 80%
Rationale: South Carolina requires applicants for the septic system installer license to achieve a
score of 80% or better on the required examination.
2. Which agency administers South Carolina's septic system installer licensing
program?
A. South Carolina Department of Transportation
B. South Carolina Department of Environmental Services
C. South Carolina Department of Labor
D. South Carolina Department of Agriculture
Correct Answer: B. South Carolina Department of Environmental Services
Rationale: The South Carolina Department of Environmental Services (SCDES) administers
the onsite wastewater and septic system licensing program.
3. Which regulation is specifically associated with South Carolina onsite
wastewater systems?
A. Regulation 61-15
B. Regulation 61-25
C. Regulation 61-56
D. Regulation 62-10
Correct Answer: C. Regulation 61-56
,Rationale: The installer licensing examination is based on South Carolina Regulation 61-56,
which governs onsite wastewater systems.
4. Which type of systems may a Tier 1 installer generally install?
A. All commercial systems
B. Standard 610 specialized systems
C. Gravity-fed residential systems
D. All systems involving pumps
Correct Answer: C. Gravity-fed residential systems
Rationale: Tier 1 licensing permits installation of gravity-fed residential onsite wastewater
systems within the scope established by Regulation 61-56.
5. Which installer tier includes systems involving pumps?
A. Tier 1
B. Tier 2
C. Tier 3 only
D. Unlicensed installers
Correct Answer: B. Tier 2
Rationale: Tier 2 includes the Tier 1 scope plus additional systems and components, including
pumps, grease traps, curtain drains, elevated infiltration systems, mounded systems, and
commercial systems.
6. Which additional category is specifically associated with Tier 3 licensing?
A. Standard 610 Specialized Onsite Wastewater Systems
B. Residential gravity systems only
C. Septic tank pumping only
D. Plumbing fixture installation
Correct Answer: A. Standard 610 Specialized Onsite Wastewater Systems
Rationale: Tier 3 expands the Tier 1 and Tier 2 scope to include Standard 610 Specialized
Onsite Wastewater Systems.
, 7. How many continuing education units does a Tier 1 installer generally need
every two years?
A. 4 CEUs
B. 6 CEUs
C. 8 CEUs
D. 12 CEUs
Correct Answer: C. 8 CEUs
Rationale: Tier 1 installers are required to complete 8 CEUs every two years under the
licensing program.
8. How many CEUs are required for a Tier 2 installer every two years?
A. 8
B. 10
C. 12
D. 18
Correct Answer: C. 12
Rationale: Tier 2 installers must complete 12 CEUs every two years.
9. How many CEUs are required for Tier 3 installers every two years?
A. 8
B. 10
C. 12
D. 18
Correct Answer: D. 18
Rationale: Tier 3 has the highest continuing education requirement: 18 CEUs every two years.
10. Which requirement applies specifically to a Tier 3 installer?
