SOUTH CAROLINA SEPTIC TANK CONTRACTOR LICENSING EXAM – QUESTIONS AND ANSWERS | VERIFIED AND
WELL DETAILED ANSWERS | PLUS RATIONALES | GUARANTEED PASS | LATEST EXAM UPDATE
Core Domains
1. South Carolina Regulations and Law (SC DHEC Regulation 61-56 and related legislation)
2. Licensing Requirements and CEUs (Tier 1, 2, and 3 Installers)
3. Site Evaluation and Soil Science (Percolation Tests, Deep Hole Analysis, Soil Texture)
4. System Design and Component Function (Septic Tanks, Drainfields, Distribution Boxes, Pumps)
5. Installation Procedures and Best Practices (Trenching, Piping, Backfilling, Tamping)
6. Setback Distances and Spatial Requirements (From Wells, Buildings, Water Bodies, Property Lines)
7. Operation, Maintenance, and Troubleshooting (Pumping, Inspections, Identifying Failure)
8. Environmental Protection and Public Health (Groundwater Safety, Septage Transport, Disposal)
9. Professional Ethics and Safety (OSHA standards, professional conduct, regulatory compliance)
Introduction
This comprehensive assessment is designed to prepare candidates for the South Carolina Septic Tank Contractor
Licensing Exam. The exam evaluates a candidate's mastery of critical knowledge areas, including the technical aspects
of onsite wastewater system design and installation, as well as the legal and regulatory framework established by SC
DHEC and SCDES, particularly Regulation 61-56. It is structured to test not only foundational knowledge but also
,applied professional skills, ethical judgment, and practical decision-making in real-world scenarios. Candidates will
encounter a mix of multiple-choice questions that challenge their ability to interpret regulations, analyze site
conditions, and select appropriate system components. Successful completion indicates readiness to install and
maintain septic systems in compliance with state standards, ensuring the protection of public health and South
Carolina’s vital water resources. The following questions are formatted to help streamline your study process and
ensure you are thoroughly prepared to pass the official examination.
Question 1
What is the primary regulatory document that governs the design, installation, and maintenance of onsite
wastewater systems in South Carolina?
A. NFPA 1403
B. SC DHEC Regulation 61-56
C. SC Department of Labor, Licensing and Regulation (LLR) Title 40
D. The International Plumbing Code (IPC)
🟢 Correct Answer: B. SC DHEC Regulation 61-56
🔴 Explanation: SC DHEC Regulation 61-56 (now under SCDES) is the specific state regulation that provides the
minimum standards for onsite wastewater systems, commonly known as septic systems. NFPA 1403 is unrelated, and
while Title 40 covers contractors, it does not contain the specific technical standards for septic systems .
Question 2
A Tier 1 installer is authorized to perform which of the following installations?
A. Any type of commercial system regardless of flow
B. Pumped systems (Low Pressure Pipe)
C. New gravity-fed residential systems only
D. Repairs to existing failing systems
,🟢 Correct Answer: C. New gravity-fed residential systems only
🔴 Explanation: Tier 1 is the entry-level classification. It is strictly limited to installing new gravity-fed residential
onsite wastewater systems. Repairs, pumped systems, and pressurized systems require a higher tier of licensure to
ensure the installer has the necessary experience and expertise .
Question 3
According to South Carolina regulations, what is the minimum passing score required for the septic tank contractor
licensing exam?
A. 70%
B. 75%
C. 80%
D. 85%
🟢 Correct Answer: C. 80%
🔴 Explanation: Section 700 of Regulation 61-56 requires applicants for a Tier 1 or Tier 2 installer license to pass the
examination with a minimum score of 80 percent. This high standard ensures that only qualified individuals are
licensed to install systems that protect public health .
Question 4
If a permit for a septic system expires, what is the contractor required to do before continuing work?
A. The contractor has a 30-day grace period to finish the work.
B. The contractor must stop work and reapply for a new permit.
C. The homeowner can authorize the continuation of work.
D. The permit is automatically renewed upon payment of a late fee.
🟢 Correct Answer: B. The contractor must stop work and reapply for a new permit.
, 🔴 Explanation: Permits are valid for a specific duration. If a permit expires, it is no longer valid. The installer must
cease all work and reapply for a new permit, which often requires a new site evaluation, to ensure the system still
meets current regulatory standards .
Question 5
Which state agency has the primary authority for regulating septic systems and issuing permits in South Carolina?
A. Department of Labor, Licensing and Regulation (LLR)
B. Department of Environmental Services (DES)
C. Department of Natural Resources (DNR)
D. Department of Agriculture
🟢 Correct Answer: B. Department of Environmental Services (DES)
🔴 Explanation: While historically under DHEC, the Department of Environmental Services (DES) is the state agency
now responsible for issuing permits for the installation of onsite wastewater systems and ensuring compliance with
state regulations such as R.61-56 .
Question 6
What is the required vertical separation distance between the bottom of the drainfield trench and the seasonal high
water table?
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
🟢 Correct Answer: B. 12 inches
WELL DETAILED ANSWERS | PLUS RATIONALES | GUARANTEED PASS | LATEST EXAM UPDATE
Core Domains
1. South Carolina Regulations and Law (SC DHEC Regulation 61-56 and related legislation)
2. Licensing Requirements and CEUs (Tier 1, 2, and 3 Installers)
3. Site Evaluation and Soil Science (Percolation Tests, Deep Hole Analysis, Soil Texture)
4. System Design and Component Function (Septic Tanks, Drainfields, Distribution Boxes, Pumps)
5. Installation Procedures and Best Practices (Trenching, Piping, Backfilling, Tamping)
6. Setback Distances and Spatial Requirements (From Wells, Buildings, Water Bodies, Property Lines)
7. Operation, Maintenance, and Troubleshooting (Pumping, Inspections, Identifying Failure)
8. Environmental Protection and Public Health (Groundwater Safety, Septage Transport, Disposal)
9. Professional Ethics and Safety (OSHA standards, professional conduct, regulatory compliance)
Introduction
This comprehensive assessment is designed to prepare candidates for the South Carolina Septic Tank Contractor
Licensing Exam. The exam evaluates a candidate's mastery of critical knowledge areas, including the technical aspects
of onsite wastewater system design and installation, as well as the legal and regulatory framework established by SC
DHEC and SCDES, particularly Regulation 61-56. It is structured to test not only foundational knowledge but also
,applied professional skills, ethical judgment, and practical decision-making in real-world scenarios. Candidates will
encounter a mix of multiple-choice questions that challenge their ability to interpret regulations, analyze site
conditions, and select appropriate system components. Successful completion indicates readiness to install and
maintain septic systems in compliance with state standards, ensuring the protection of public health and South
Carolina’s vital water resources. The following questions are formatted to help streamline your study process and
ensure you are thoroughly prepared to pass the official examination.
Question 1
What is the primary regulatory document that governs the design, installation, and maintenance of onsite
wastewater systems in South Carolina?
A. NFPA 1403
B. SC DHEC Regulation 61-56
C. SC Department of Labor, Licensing and Regulation (LLR) Title 40
D. The International Plumbing Code (IPC)
🟢 Correct Answer: B. SC DHEC Regulation 61-56
🔴 Explanation: SC DHEC Regulation 61-56 (now under SCDES) is the specific state regulation that provides the
minimum standards for onsite wastewater systems, commonly known as septic systems. NFPA 1403 is unrelated, and
while Title 40 covers contractors, it does not contain the specific technical standards for septic systems .
Question 2
A Tier 1 installer is authorized to perform which of the following installations?
A. Any type of commercial system regardless of flow
B. Pumped systems (Low Pressure Pipe)
C. New gravity-fed residential systems only
D. Repairs to existing failing systems
,🟢 Correct Answer: C. New gravity-fed residential systems only
🔴 Explanation: Tier 1 is the entry-level classification. It is strictly limited to installing new gravity-fed residential
onsite wastewater systems. Repairs, pumped systems, and pressurized systems require a higher tier of licensure to
ensure the installer has the necessary experience and expertise .
Question 3
According to South Carolina regulations, what is the minimum passing score required for the septic tank contractor
licensing exam?
A. 70%
B. 75%
C. 80%
D. 85%
🟢 Correct Answer: C. 80%
🔴 Explanation: Section 700 of Regulation 61-56 requires applicants for a Tier 1 or Tier 2 installer license to pass the
examination with a minimum score of 80 percent. This high standard ensures that only qualified individuals are
licensed to install systems that protect public health .
Question 4
If a permit for a septic system expires, what is the contractor required to do before continuing work?
A. The contractor has a 30-day grace period to finish the work.
B. The contractor must stop work and reapply for a new permit.
C. The homeowner can authorize the continuation of work.
D. The permit is automatically renewed upon payment of a late fee.
🟢 Correct Answer: B. The contractor must stop work and reapply for a new permit.
, 🔴 Explanation: Permits are valid for a specific duration. If a permit expires, it is no longer valid. The installer must
cease all work and reapply for a new permit, which often requires a new site evaluation, to ensure the system still
meets current regulatory standards .
Question 5
Which state agency has the primary authority for regulating septic systems and issuing permits in South Carolina?
A. Department of Labor, Licensing and Regulation (LLR)
B. Department of Environmental Services (DES)
C. Department of Natural Resources (DNR)
D. Department of Agriculture
🟢 Correct Answer: B. Department of Environmental Services (DES)
🔴 Explanation: While historically under DHEC, the Department of Environmental Services (DES) is the state agency
now responsible for issuing permits for the installation of onsite wastewater systems and ensuring compliance with
state regulations such as R.61-56 .
Question 6
What is the required vertical separation distance between the bottom of the drainfield trench and the seasonal high
water table?
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
🟢 Correct Answer: B. 12 inches
