1
SOUTH CAROLINA SEPTIC TANK INSTALLER LICENSE EXAM SC
DEPARTMENT OF ENVIRONMENTAL SERVICES (SCDES) ACADEMIC
YEAR 2026-2027 FULL PACKAGE QUESTIONS ANSWERS AND
RATIONALES LATEST UPDATED VERSION
INSTANT DOWNLOAD PDF..!!
INTRODUCTION
The South Carolina Septic Tank Installer License Examination is the official credentialing assessment administered by the
South Carolina Department of Environmental Services (SCDES), formerly DHEC, for individuals seeking to construct, repair,
or modify onsite wastewater systems throughout the state . This license is mandatory for anyone performing septic system
installation work in South Carolina, with the exception of a person constructing or repairing a system for personal use at
their own residence . The examination process includes a written exam testing knowledge of Regulation 61-56, with a
minimum passing score of 80 percent required . South Carolina employs a tiered licensing system: Tier 1 installers may
install gravity-fed residential systems, Tier 2 installers may additionally install pumped and commercial systems, and Tier 3
installers may install Standard 610 specialized systems and must maintain bond and insurance coverage . This
comprehensive question bank delivers 200 advanced, scenario-based questions modeled on the official SCDES exam
domains, including licensing requirements, Regulation 61-56 compliance, soil evaluation, system design, setbacks,
installation procedures, and safety protocols. Each question includes a detailed rationale explaining why the correct answer
is right and analyzing why each distractor fails. By mastering this bank, you will develop the regulatory and technical
knowledge required to pass on your first attempt and to install septic systems safely and legally in South Carolina.
CORE DOMAINS TESTED
1. Licensing and Regulatory Framework – Tiered licensing system, application requirements, fees, renewal, and CEU
requirements.
2. Regulation 61-56 Compliance – Scope, definitions, permit requirements, and enforcement provisions.
3. Soil Evaluation and Site Assessment – Soil morphology, percolation testing, seasonal high water table
determination, and site limitations.
4. System Design and Sizing – Daily flow calculations, tank sizing, drainfield sizing, and system type selection.
5. Setback Requirements – Distances from wells, property lines, surface water, foundations, and other features.
6. Installation Procedures – Tank installation, drainfield construction, distribution boxes, and piping.
7. Alternative and Advanced Systems – Mound systems, drip dispersal, low-pressure pipe, and Standard 610
systems.
8. Maintenance and Troubleshooting – Pumping frequency, system failure indicators, and repair procedures.
9. Safety and Confined Space – OSHA requirements, gas hazards, and equipment operation.
,2
QUESTIONS 1-200
Q1: Which specific South Carolina regulation governs the design,
installation, and maintenance of septic tanks and onsite wastewater
systems?
A) R.61-51 (Standards for Swimming Pools)
B) R.61-56 (Onsite Wastewater Systems)
C) R.61-67 (Solid Waste Management)
D) R.61-25 (Retail Food Establishments)
Rationale: The correct answer is B. Regulation 61-56 is the exclusive
regulatory authority for onsite wastewater treatment and disposal
systems in South Carolina, covering design, construction, repair, and
maintenance requirements. Option A is incorrect because R.61-51
addresses swimming pool standards, which are unrelated to septic
systems. Option C is incorrect because R.61-67 governs solid waste
management, not wastewater. Option D is incorrect because R.61-25
regulates retail food establishments.
Q2: 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
Rationale: The correct answer is C. Tier 1 is the entry-level
classification limited strictly to installing all gravity-fed and fill-cap
residential onsite wastewater systems. Option A is incorrect because
commercial systems require a Tier 2 or Tier 3 license. Option B is
incorrect because pumped systems require a Tier 2 license. Option D
,3
is incorrect because repairs to existing systems require a Tier 2
license.
Q3: According to SCDES licensing rules, what is the minimum
passing score required for the septic tank contractor exam?
A) 70%
B) 75%
C) 80%
D) 100%
Rationale: The correct answer is C. Candidates must achieve a score
of 80 percent or better to pass the licensing examination. Option A is
incorrect because 70% is below the passing threshold. Option B is
incorrect because 75% is below the threshold. Option D is incorrect
because a perfect score is not required.
Q4: If a permit expires, what is the status of the contractor's work?
A) The contractor has a 30-day grace period to finish
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
Rationale: The correct answer is B. Permits are valid for a specific
duration, and once expired, a new permit application and site
evaluation are required before any further installation. Option A is
incorrect because no grace period exists for expired permits. Option
C is incorrect because homeowner authorization cannot override
regulatory requirements. Option D is incorrect because permits are
not automatically renewed.
Q5: Who is legally responsible for obtaining the construction permit
before installing a septic system in South Carolina?
, 4
A) The property owner
B) The general contractor building the house
C) The licensed septic tank installer
D) The real estate agent
Rationale: The correct answer is C. A licensed installer must pull the
permit. The regulation explicitly requires the licensed professional to
ensure the permit is issued or applied for before starting work.
Option A is incorrect because while the owner may authorize the
work, the licensed installer is responsible for the permit. Option B is
incorrect because the general contractor is not the permit holder
unless they also hold a septic installer license. Option D is incorrect
because real estate agents have no permit authority.
Q6: How often must a septic system installer renew their license
with SCDES?
A) Annually
B) Every 2 years
C) Every 3 years
D) Every 5 years
Rationale: The correct answer is A. Licenses for installers must be
renewed annually and are subject to late fees if not paid on time.
Option B is incorrect because the 2-year period applies to CEU
requirements, not license renewal. Option C is incorrect because 3
years is the permit duration, not license renewal. Option D is
incorrect because 5 years is not the renewal cycle.
Q7: A septic contractor in South Carolina must hold a license issued
by which entity?
A) South Carolina Department of Labor, Licensing and Regulation
(LLR)
SOUTH CAROLINA SEPTIC TANK INSTALLER LICENSE EXAM SC
DEPARTMENT OF ENVIRONMENTAL SERVICES (SCDES) ACADEMIC
YEAR 2026-2027 FULL PACKAGE QUESTIONS ANSWERS AND
RATIONALES LATEST UPDATED VERSION
INSTANT DOWNLOAD PDF..!!
INTRODUCTION
The South Carolina Septic Tank Installer License Examination is the official credentialing assessment administered by the
South Carolina Department of Environmental Services (SCDES), formerly DHEC, for individuals seeking to construct, repair,
or modify onsite wastewater systems throughout the state . This license is mandatory for anyone performing septic system
installation work in South Carolina, with the exception of a person constructing or repairing a system for personal use at
their own residence . The examination process includes a written exam testing knowledge of Regulation 61-56, with a
minimum passing score of 80 percent required . South Carolina employs a tiered licensing system: Tier 1 installers may
install gravity-fed residential systems, Tier 2 installers may additionally install pumped and commercial systems, and Tier 3
installers may install Standard 610 specialized systems and must maintain bond and insurance coverage . This
comprehensive question bank delivers 200 advanced, scenario-based questions modeled on the official SCDES exam
domains, including licensing requirements, Regulation 61-56 compliance, soil evaluation, system design, setbacks,
installation procedures, and safety protocols. Each question includes a detailed rationale explaining why the correct answer
is right and analyzing why each distractor fails. By mastering this bank, you will develop the regulatory and technical
knowledge required to pass on your first attempt and to install septic systems safely and legally in South Carolina.
CORE DOMAINS TESTED
1. Licensing and Regulatory Framework – Tiered licensing system, application requirements, fees, renewal, and CEU
requirements.
2. Regulation 61-56 Compliance – Scope, definitions, permit requirements, and enforcement provisions.
3. Soil Evaluation and Site Assessment – Soil morphology, percolation testing, seasonal high water table
determination, and site limitations.
4. System Design and Sizing – Daily flow calculations, tank sizing, drainfield sizing, and system type selection.
5. Setback Requirements – Distances from wells, property lines, surface water, foundations, and other features.
6. Installation Procedures – Tank installation, drainfield construction, distribution boxes, and piping.
7. Alternative and Advanced Systems – Mound systems, drip dispersal, low-pressure pipe, and Standard 610
systems.
8. Maintenance and Troubleshooting – Pumping frequency, system failure indicators, and repair procedures.
9. Safety and Confined Space – OSHA requirements, gas hazards, and equipment operation.
,2
QUESTIONS 1-200
Q1: Which specific South Carolina regulation governs the design,
installation, and maintenance of septic tanks and onsite wastewater
systems?
A) R.61-51 (Standards for Swimming Pools)
B) R.61-56 (Onsite Wastewater Systems)
C) R.61-67 (Solid Waste Management)
D) R.61-25 (Retail Food Establishments)
Rationale: The correct answer is B. Regulation 61-56 is the exclusive
regulatory authority for onsite wastewater treatment and disposal
systems in South Carolina, covering design, construction, repair, and
maintenance requirements. Option A is incorrect because R.61-51
addresses swimming pool standards, which are unrelated to septic
systems. Option C is incorrect because R.61-67 governs solid waste
management, not wastewater. Option D is incorrect because R.61-25
regulates retail food establishments.
Q2: 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
Rationale: The correct answer is C. Tier 1 is the entry-level
classification limited strictly to installing all gravity-fed and fill-cap
residential onsite wastewater systems. Option A is incorrect because
commercial systems require a Tier 2 or Tier 3 license. Option B is
incorrect because pumped systems require a Tier 2 license. Option D
,3
is incorrect because repairs to existing systems require a Tier 2
license.
Q3: According to SCDES licensing rules, what is the minimum
passing score required for the septic tank contractor exam?
A) 70%
B) 75%
C) 80%
D) 100%
Rationale: The correct answer is C. Candidates must achieve a score
of 80 percent or better to pass the licensing examination. Option A is
incorrect because 70% is below the passing threshold. Option B is
incorrect because 75% is below the threshold. Option D is incorrect
because a perfect score is not required.
Q4: If a permit expires, what is the status of the contractor's work?
A) The contractor has a 30-day grace period to finish
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
Rationale: The correct answer is B. Permits are valid for a specific
duration, and once expired, a new permit application and site
evaluation are required before any further installation. Option A is
incorrect because no grace period exists for expired permits. Option
C is incorrect because homeowner authorization cannot override
regulatory requirements. Option D is incorrect because permits are
not automatically renewed.
Q5: Who is legally responsible for obtaining the construction permit
before installing a septic system in South Carolina?
, 4
A) The property owner
B) The general contractor building the house
C) The licensed septic tank installer
D) The real estate agent
Rationale: The correct answer is C. A licensed installer must pull the
permit. The regulation explicitly requires the licensed professional to
ensure the permit is issued or applied for before starting work.
Option A is incorrect because while the owner may authorize the
work, the licensed installer is responsible for the permit. Option B is
incorrect because the general contractor is not the permit holder
unless they also hold a septic installer license. Option D is incorrect
because real estate agents have no permit authority.
Q6: How often must a septic system installer renew their license
with SCDES?
A) Annually
B) Every 2 years
C) Every 3 years
D) Every 5 years
Rationale: The correct answer is A. Licenses for installers must be
renewed annually and are subject to late fees if not paid on time.
Option B is incorrect because the 2-year period applies to CEU
requirements, not license renewal. Option C is incorrect because 3
years is the permit duration, not license renewal. Option D is
incorrect because 5 years is not the renewal cycle.
Q7: A septic contractor in South Carolina must hold a license issued
by which entity?
A) South Carolina Department of Labor, Licensing and Regulation
(LLR)
