SC COMBINED SEWER SYSTEM OPERATOR EXAM
QUESTIONS AND CORRECT ANSWERS (VERIFIED
ANSWERS) Q&A 2026-2027|INSTANT DOWNLOAD
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1. What is the primary function of a combined sewer system?
A. To transport only drinking water
B. To collect and convey both sanitary sewage and stormwater
in the same pipes
C. To treat wastewater inside pipelines
D. To store groundwater
Correct Answer: B. To collect and convey both sanitary
sewage and stormwater in the same pipes
Rationale: Combined sewer systems are designed to carry both
wastewater from homes/businesses and stormwater runoff
through one collection system.
2. What is a major concern during heavy rainfall in a combined
sewer system?
A. Reduced pipe temperature
B. Increased drinking water production
C. Combined sewer overflows (CSOs)
D. Lower wastewater flow
,Correct Answer: C. Combined sewer overflows (CSOs)
Rationale: Excess stormwater can exceed system capacity,
causing untreated or partially treated wastewater to discharge
into receiving waters.
3. A sewer operator’s main responsibility is to:
A. Design highways
B. Maintain and operate wastewater collection systems safely
C. Manufacture pipes
D. Monitor air traffic
Correct Answer: B. Maintain and operate wastewater
collection systems safely
Rationale: Operators ensure proper flow, maintenance, safety,
and compliance with regulations.
4. What does CSO stand for?
A. Central Sewer Operation
B. Combined Sewer Overflow
C. Chemical Sewer Outlet
D. Controlled Sanitary Operation
Correct Answer: B. Combined Sewer Overflow
Rationale: CSO refers to the discharge that occurs when
combined sewer capacity is exceeded.
,5. Which component prevents large debris from entering a
sewer system?
A. Bar screen
B. Aerator
C. Chlorinator
D. Pump seal
Correct Answer: A. Bar screen
Rationale: Bar screens remove large objects such as trash,
sticks, and debris before they damage equipment.
6. What is the purpose of sewer manholes?
A. Increase water pressure
B. Provide access for inspection, cleaning, and maintenance
C. Store chemicals
D. Eliminate wastewater treatment
Correct Answer: B. Provide access for inspection, cleaning, and
maintenance
Rationale: Manholes allow operators to access underground
sewer lines safely.
7. Sewer pipes are generally designed to flow:
, A. Completely full under pressure at all times
B. By gravity with partial flow
C. Without any slope
D. Backward during storms
Correct Answer: B. By gravity with partial flow
Rationale: Most collection systems rely on gravity flow and
proper pipe slope.
8. What instrument is commonly used to measure flow in
sewer systems?
A. Flow meter
B. Thermometer
C. pH strip
D. Barometer
Correct Answer: A. Flow meter
Rationale: Flow meters measure wastewater movement
through pipes and channels.
9. What is infiltration in a sewer system?
A. Stormwater entering through cracks and defects in pipes
B. Chemical treatment of wastewater
C. Removal of solids
D. Pipe cleaning
QUESTIONS AND CORRECT ANSWERS (VERIFIED
ANSWERS) Q&A 2026-2027|INSTANT DOWNLOAD
1. What is the primary function of a combined sewer system?
A. To transport only drinking water
B. To collect and convey both sanitary sewage and stormwater
in the same pipes
C. To treat wastewater inside pipelines
D. To store groundwater
Correct Answer: B. To collect and convey both sanitary
sewage and stormwater in the same pipes
Rationale: Combined sewer systems are designed to carry both
wastewater from homes/businesses and stormwater runoff
through one collection system.
2. What is a major concern during heavy rainfall in a combined
sewer system?
A. Reduced pipe temperature
B. Increased drinking water production
C. Combined sewer overflows (CSOs)
D. Lower wastewater flow
,Correct Answer: C. Combined sewer overflows (CSOs)
Rationale: Excess stormwater can exceed system capacity,
causing untreated or partially treated wastewater to discharge
into receiving waters.
3. A sewer operator’s main responsibility is to:
A. Design highways
B. Maintain and operate wastewater collection systems safely
C. Manufacture pipes
D. Monitor air traffic
Correct Answer: B. Maintain and operate wastewater
collection systems safely
Rationale: Operators ensure proper flow, maintenance, safety,
and compliance with regulations.
4. What does CSO stand for?
A. Central Sewer Operation
B. Combined Sewer Overflow
C. Chemical Sewer Outlet
D. Controlled Sanitary Operation
Correct Answer: B. Combined Sewer Overflow
Rationale: CSO refers to the discharge that occurs when
combined sewer capacity is exceeded.
,5. Which component prevents large debris from entering a
sewer system?
A. Bar screen
B. Aerator
C. Chlorinator
D. Pump seal
Correct Answer: A. Bar screen
Rationale: Bar screens remove large objects such as trash,
sticks, and debris before they damage equipment.
6. What is the purpose of sewer manholes?
A. Increase water pressure
B. Provide access for inspection, cleaning, and maintenance
C. Store chemicals
D. Eliminate wastewater treatment
Correct Answer: B. Provide access for inspection, cleaning, and
maintenance
Rationale: Manholes allow operators to access underground
sewer lines safely.
7. Sewer pipes are generally designed to flow:
, A. Completely full under pressure at all times
B. By gravity with partial flow
C. Without any slope
D. Backward during storms
Correct Answer: B. By gravity with partial flow
Rationale: Most collection systems rely on gravity flow and
proper pipe slope.
8. What instrument is commonly used to measure flow in
sewer systems?
A. Flow meter
B. Thermometer
C. pH strip
D. Barometer
Correct Answer: A. Flow meter
Rationale: Flow meters measure wastewater movement
through pipes and channels.
9. What is infiltration in a sewer system?
A. Stormwater entering through cracks and defects in pipes
B. Chemical treatment of wastewater
C. Removal of solids
D. Pipe cleaning
