1. What is the minimum setback distance between a septic tank and a
private well in South Carolina?
A. 25 feet
B. 50 feet
C. 75 feet
D. 100 feet
Answer: B. 50 feet
Explanation: SC DHEC regulations require a minimum 50-foot setback from
septic tanks to private wells to prevent groundwater contamination.
2. How often should a typical household septic tank be pumped?
A. Every year
B. Every 3-5 years
C. Every 10 years
D. Only when full
Answer: B. Every 3–5 years
Explanation: Regular pumping every 3 to 5 years ensures optimal system
function and prevents costly backups or system failure.
3. What is the main function of a distribution box in a septic system?
A. Store sewage temporarily
B. Pump sewage uphill
C. Evenly distribute effluent to drainfield lines
D. Neutralize harmful bacteria
Answer: C. Evenly distribute effluent to drainfield lines
Explanation: The distribution box allows equal flow into each drainfield line,
promoting even absorption into the soil.
,4. What type of soil is best for septic system drainfields?
A. Clay
B. Loamy sand
C. Silt
D. Solid rock
Answer: B. Loamy sand
Explanation: Loamy sand allows for proper percolation and filtration, making
it ideal for septic drainfields.
5. Which component of a septic system separates solids from wastewater?
A. Distribution box
B. Drainfield
C. Septic tank
D. Effluent filter
Answer: C. Septic tank
Explanation: The tank allows solids to settle and scum to float, isolating the
clearer effluent.
6. What is a perk test used for?
A. Measuring pH of wastewater
B. Determining soil percolation rate
C. Checking tank size
D. Measuring effluent temperature
Answer: B. Determining soil percolation rate
Explanation: A percolation (perk) test evaluates how quickly soil absorbs
water to determine system feasibility.
7. Who regulates septic system installations in South Carolina?
A. EPA
B. OSHA
C. SC DHEC
D. County Water Authority
Answer: C. SC DHEC
Explanation: The South Carolina Department of Health and Environmental
Control (DHEC) oversees all septic systems in the state.
,8. What is the minimum septic tank size for a 3-bedroom home in SC?
A. 500 gallons
B. 750 gallons
C. 1000 gallons
D. 1500 gallons
Answer: C. 1000 gallons
Explanation: SC DHEC requires at least 1000 gallons for homes with up to 3
bedrooms.
9. What happens if grease enters the septic system regularly?
A. System works faster
B. Grease coats pipes and clogs the system
C. No effect
D. Kills bacteria in the tank
Answer: B. Grease coats pipes and clogs the system
Explanation: Grease can clog the pipes and harm the microbial balance needed
for digestion.
10. Why is it important to keep trees away from the septic system?
A. Shade causes tank overflow
B. Roots can clog and break pipes
C. Trees attract insects
D. Trees lower soil temperature
Answer: B. Roots can clog and break pipes
Explanation: Tree roots infiltrate pipes and can damage tanks and distribution
systems.
11. A riser is used for:
A. Elevating the tank
B. Making septic access easier
C. Filtering the effluent
D. Disinfecting wastewater
Answer: B. Making septic access easier
Explanation: Risers provide ground-level access to the tank for inspection and
pumping.
, 12. Which material is commonly used for drainfield pipes?
A. Lead
B. Steel
C. PVC
D. Copper
Answer: C. PVC
Explanation: PVC is lightweight, corrosion-resistant, and affordable, making it
ideal for septic systems.
13. The term "effluent" refers to:
A. Solid sludge
B. Floating scum
C. Liquid wastewater after treatment
D. Bacteria in the tank
Answer: C. Liquid wastewater after treatment
Explanation: Effluent is the clarified liquid that flows from the tank to the
drainfield.
14. What should not be flushed into a septic system?
A. Toilet paper
B. Biodegradable soap
C. Coffee grounds and grease
D. Wastewater
Answer: C. Coffee grounds and grease
Explanation: Non-biodegradable and greasy items clog the system and disrupt
bacteria.
15. The drainfield is responsible for:
A. Holding sewage
B. Filtering and dispersing treated water
C. Grinding solids
D. Producing electricity
Answer: B. Filtering and dispersing treated water
Explanation: The drainfield provides final filtration as the effluent percolates
through the soil.
private well in South Carolina?
A. 25 feet
B. 50 feet
C. 75 feet
D. 100 feet
Answer: B. 50 feet
Explanation: SC DHEC regulations require a minimum 50-foot setback from
septic tanks to private wells to prevent groundwater contamination.
2. How often should a typical household septic tank be pumped?
A. Every year
B. Every 3-5 years
C. Every 10 years
D. Only when full
Answer: B. Every 3–5 years
Explanation: Regular pumping every 3 to 5 years ensures optimal system
function and prevents costly backups or system failure.
3. What is the main function of a distribution box in a septic system?
A. Store sewage temporarily
B. Pump sewage uphill
C. Evenly distribute effluent to drainfield lines
D. Neutralize harmful bacteria
Answer: C. Evenly distribute effluent to drainfield lines
Explanation: The distribution box allows equal flow into each drainfield line,
promoting even absorption into the soil.
,4. What type of soil is best for septic system drainfields?
A. Clay
B. Loamy sand
C. Silt
D. Solid rock
Answer: B. Loamy sand
Explanation: Loamy sand allows for proper percolation and filtration, making
it ideal for septic drainfields.
5. Which component of a septic system separates solids from wastewater?
A. Distribution box
B. Drainfield
C. Septic tank
D. Effluent filter
Answer: C. Septic tank
Explanation: The tank allows solids to settle and scum to float, isolating the
clearer effluent.
6. What is a perk test used for?
A. Measuring pH of wastewater
B. Determining soil percolation rate
C. Checking tank size
D. Measuring effluent temperature
Answer: B. Determining soil percolation rate
Explanation: A percolation (perk) test evaluates how quickly soil absorbs
water to determine system feasibility.
7. Who regulates septic system installations in South Carolina?
A. EPA
B. OSHA
C. SC DHEC
D. County Water Authority
Answer: C. SC DHEC
Explanation: The South Carolina Department of Health and Environmental
Control (DHEC) oversees all septic systems in the state.
,8. What is the minimum septic tank size for a 3-bedroom home in SC?
A. 500 gallons
B. 750 gallons
C. 1000 gallons
D. 1500 gallons
Answer: C. 1000 gallons
Explanation: SC DHEC requires at least 1000 gallons for homes with up to 3
bedrooms.
9. What happens if grease enters the septic system regularly?
A. System works faster
B. Grease coats pipes and clogs the system
C. No effect
D. Kills bacteria in the tank
Answer: B. Grease coats pipes and clogs the system
Explanation: Grease can clog the pipes and harm the microbial balance needed
for digestion.
10. Why is it important to keep trees away from the septic system?
A. Shade causes tank overflow
B. Roots can clog and break pipes
C. Trees attract insects
D. Trees lower soil temperature
Answer: B. Roots can clog and break pipes
Explanation: Tree roots infiltrate pipes and can damage tanks and distribution
systems.
11. A riser is used for:
A. Elevating the tank
B. Making septic access easier
C. Filtering the effluent
D. Disinfecting wastewater
Answer: B. Making septic access easier
Explanation: Risers provide ground-level access to the tank for inspection and
pumping.
, 12. Which material is commonly used for drainfield pipes?
A. Lead
B. Steel
C. PVC
D. Copper
Answer: C. PVC
Explanation: PVC is lightweight, corrosion-resistant, and affordable, making it
ideal for septic systems.
13. The term "effluent" refers to:
A. Solid sludge
B. Floating scum
C. Liquid wastewater after treatment
D. Bacteria in the tank
Answer: C. Liquid wastewater after treatment
Explanation: Effluent is the clarified liquid that flows from the tank to the
drainfield.
14. What should not be flushed into a septic system?
A. Toilet paper
B. Biodegradable soap
C. Coffee grounds and grease
D. Wastewater
Answer: C. Coffee grounds and grease
Explanation: Non-biodegradable and greasy items clog the system and disrupt
bacteria.
15. The drainfield is responsible for:
A. Holding sewage
B. Filtering and dispersing treated water
C. Grinding solids
D. Producing electricity
Answer: B. Filtering and dispersing treated water
Explanation: The drainfield provides final filtration as the effluent percolates
through the soil.
