SOUTH CAROLINA SEPTIC TANK INSTALLER LICENSE
EXAM 2026/2027 QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) PLUS RATIONALES 2026 Q&A |
INSTANT DOWNLOAD PDF.
CORE DOMAINS
Regulation 61-56 (Onsite Wastewater Systems)
Installer Licensing (Tier 1, Tier 2, Tier 3)
Permitting and Construction Authorization
Site Evaluation and Soil Analysis
Septic Tank Design and Installation
Drainfield and Infiltration Area Design
Setback Requirements and Site Protection
Inspection, Approval, and Maintenance
INTRODUCTION
This assessment evaluates the knowledge and competency
required of septic tank installers in South Carolina. It covers
Regulation 61-56, tiered licensing, permitting, site and soil
evaluation, tank and drainfield installation, setback
requirements, inspection, and maintenance. The multiple-
choice and scenario-based format measures recall,
interpretation, and real-world application. Emphasis is placed
on regulatory compliance, environmental protection, and safe
installation practices. This exam prepares candidates for the
,SCDES licensing examination by testing critical thinking and
practical decision-making in onsite wastewater system
installation.
SECTION ONE: QUESTIONS 1–100
1. Before beginning the installation of a new onsite
wastewater treatment system in South Carolina, which
action must occur first?
A. Excavate the absorption trenches
B. Purchase all septic system materials
C. Obtain the required permit from the appropriate
regulatory authority
D. Install the septic tank before scheduling an inspection
🟢 C. Obtain the required permit from the appropriate
regulatory authority
🔴 RATIONALE: South Carolina requires an approved permit
before installation begins. The permit confirms that the
proposed system design, location, soil conditions, and
wastewater disposal method comply with applicable
environmental health regulations.
2. Which component of a conventional septic system
provides the primary treatment by allowing solids to
, settle and grease to float before wastewater enters the
drainfield?
A. Distribution box
B. Septic tank
C. Absorption trench
D. Inspection port
🟢 B. Septic tank
🔴 RATIONALE: The septic tank performs primary treatment
by separating solids, scum, and clarified effluent. Only
partially treated effluent should flow to the drainfield.
3. What is the minimum net liquid capacity for a septic tank
serving a three-bedroom residence in South Carolina?
A. 750 gallons
B. 1,000 gallons
C. 1,250 gallons
D. 1,500 gallons
🟢 C. 1,250 gallons
🔴 RATIONALE: Regulation 61-56 establishes a minimum
net liquid capacity of 1,250 gallons for septic tanks serving
three-bedroom dwellings in South Carolina.
, 4. A five-bedroom dwelling requires a septic tank under the
standard residential sizing rule. What minimum capacity
should the installer recognize?
A. 1,000 gallons
B. 1,250 gallons
C. 1,500 gallons
D. 2,000 gallons
🟢 C. 1,500 gallons
🔴 RATIONALE: The regulation requires a minimum of 1,500
gallons for a four-bedroom dwelling and an additional 250
gallons for each bedroom beyond four, making a five-
bedroom dwelling require at least 1,750 gallons.
5. Which South Carolina agency currently regulates onsite
wastewater systems under Regulation 61-56?
A. U.S. Environmental Protection Agency
B. South Carolina Department of Labor, Licensing and
Regulation
C. South Carolina Department of Natural Resources
D. South Carolina Department of Environmental Services
(SCDES)
🟢 D. South Carolina Department of Environmental Services
(SCDES)
EXAM 2026/2027 QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) PLUS RATIONALES 2026 Q&A |
INSTANT DOWNLOAD PDF.
CORE DOMAINS
Regulation 61-56 (Onsite Wastewater Systems)
Installer Licensing (Tier 1, Tier 2, Tier 3)
Permitting and Construction Authorization
Site Evaluation and Soil Analysis
Septic Tank Design and Installation
Drainfield and Infiltration Area Design
Setback Requirements and Site Protection
Inspection, Approval, and Maintenance
INTRODUCTION
This assessment evaluates the knowledge and competency
required of septic tank installers in South Carolina. It covers
Regulation 61-56, tiered licensing, permitting, site and soil
evaluation, tank and drainfield installation, setback
requirements, inspection, and maintenance. The multiple-
choice and scenario-based format measures recall,
interpretation, and real-world application. Emphasis is placed
on regulatory compliance, environmental protection, and safe
installation practices. This exam prepares candidates for the
,SCDES licensing examination by testing critical thinking and
practical decision-making in onsite wastewater system
installation.
SECTION ONE: QUESTIONS 1–100
1. Before beginning the installation of a new onsite
wastewater treatment system in South Carolina, which
action must occur first?
A. Excavate the absorption trenches
B. Purchase all septic system materials
C. Obtain the required permit from the appropriate
regulatory authority
D. Install the septic tank before scheduling an inspection
🟢 C. Obtain the required permit from the appropriate
regulatory authority
🔴 RATIONALE: South Carolina requires an approved permit
before installation begins. The permit confirms that the
proposed system design, location, soil conditions, and
wastewater disposal method comply with applicable
environmental health regulations.
2. Which component of a conventional septic system
provides the primary treatment by allowing solids to
, settle and grease to float before wastewater enters the
drainfield?
A. Distribution box
B. Septic tank
C. Absorption trench
D. Inspection port
🟢 B. Septic tank
🔴 RATIONALE: The septic tank performs primary treatment
by separating solids, scum, and clarified effluent. Only
partially treated effluent should flow to the drainfield.
3. What is the minimum net liquid capacity for a septic tank
serving a three-bedroom residence in South Carolina?
A. 750 gallons
B. 1,000 gallons
C. 1,250 gallons
D. 1,500 gallons
🟢 C. 1,250 gallons
🔴 RATIONALE: Regulation 61-56 establishes a minimum
net liquid capacity of 1,250 gallons for septic tanks serving
three-bedroom dwellings in South Carolina.
, 4. A five-bedroom dwelling requires a septic tank under the
standard residential sizing rule. What minimum capacity
should the installer recognize?
A. 1,000 gallons
B. 1,250 gallons
C. 1,500 gallons
D. 2,000 gallons
🟢 C. 1,500 gallons
🔴 RATIONALE: The regulation requires a minimum of 1,500
gallons for a four-bedroom dwelling and an additional 250
gallons for each bedroom beyond four, making a five-
bedroom dwelling require at least 1,750 gallons.
5. Which South Carolina agency currently regulates onsite
wastewater systems under Regulation 61-56?
A. U.S. Environmental Protection Agency
B. South Carolina Department of Labor, Licensing and
Regulation
C. South Carolina Department of Natural Resources
D. South Carolina Department of Environmental Services
(SCDES)
🟢 D. South Carolina Department of Environmental Services
(SCDES)
