TCEQ Wastewater Collection
System Operator Sewer System
Inspection Exam Questions and
Correct Answers with Detailed
Rationales | 2026/2027 Edition |
PDF
1. What is the primary purpose of inspecting a wastewater
collection system?
A. To increase wastewater treatment plant capacity
B. To identify defects, blockages, infiltration, inflow, and other
conditions that may affect system performance
C. To eliminate the need for preventive maintenance
D. To determine employee staffing levels
Answer: B. To identify defects, blockages, infiltration, inflow,
and other conditions that may affect system performance
Rationale: Sewer system inspection is used to determine the
physical and operational condition of collection-system
components. Inspections can reveal structural defects, root
intrusion, sediment accumulation, illegal connections, infiltration,
inflow, and other problems. Identifying these conditions allows
operators to prioritize maintenance and rehabilitation before
failures occur.
,2. Which inspection method provides a visual examination of
the interior of a sewer pipe using a remotely operated camera?
A. Smoke testing
B. Dye testing
C. Closed-circuit television inspection
D. Pressure testing
Answer: C. Closed-circuit television inspection
Rationale: Closed-circuit television (CCTV) inspection uses a
camera mounted on a remotely controlled crawler or similar
device to examine the inside of sewer pipelines. It allows
operators to document defects such as cracks, fractures,
displaced joints, root intrusion, deposits, holes, and service
connections without excavating the pipe.
3. Before conducting a CCTV inspection, why is it often
necessary to clean the sewer?
A. To increase pipe diameter
B. To remove obstructions and deposits that could conceal
defects or interfere with the camera
C. To disinfect the wastewater
D. To increase groundwater pressure
Answer: B. To remove obstructions and deposits that could
conceal defects or interfere with the camera
Rationale: Sediment, grease, roots, and other deposits can
obstruct the camera's view and prevent the equipment from
traveling through the pipe. Cleaning the sewer before inspection
improves visibility and produces more reliable information about
the pipe's actual condition.
,4. Which condition is most directly associated with
groundwater entering a sewer through defects or joints?
A. Inflow
B. Infiltration
C. Evaporation
D. Recirculation
Answer: B. Infiltration
Rationale: Infiltration is groundwater entering a sewer through
cracks, defective joints, porous materials, broken pipe, manholes,
or other openings below or near the groundwater table. Inflow
generally refers to relatively direct entry of surface water or
stormwater through openings such as roof leaders, yard drains, or
damaged manhole covers.
5. During a CCTV inspection, a circular opening where a
property service line connects to the main sewer should
generally be recorded as what?
A. Service connection
B. Pipe collapse
C. Root intrusion
D. Joint separation
Answer: A. Service connection
Rationale: Service connections are points where lateral sewer
lines connect to the mainline sewer. During CCTV inspection, the
operator should document the location and condition of these
connections, including whether they appear properly connected
, or show defects such as protrusion, leakage, or improper
construction.
6. Which observation would provide the strongest evidence of
root intrusion into a sewer pipe?
A. A smooth pipe wall with no deposits
B. Vegetation or root masses visibly entering through a pipe joint
or crack
C. A properly sealed service connection
D. A clean manhole bench
Answer: B. Vegetation or root masses visibly entering through
a pipe joint or crack
Rationale: Roots commonly enter sewer pipes through cracks,
defective joints, and other openings where moisture and nutrients
are available. During inspection, visible roots extending into the
pipe are direct evidence of root intrusion and may indicate a
continuing structural or joint-sealing problem.
7. What is one important advantage of documenting sewer
defects by their distance from a manhole?
A. It eliminates the need for inspection records
B. It allows maintenance personnel to locate the defect more
accurately
C. It determines wastewater temperature
D. It automatically repairs the defect
Answer: B. It allows maintenance personnel to locate the
defect more accurately
System Operator Sewer System
Inspection Exam Questions and
Correct Answers with Detailed
Rationales | 2026/2027 Edition |
1. What is the primary purpose of inspecting a wastewater
collection system?
A. To increase wastewater treatment plant capacity
B. To identify defects, blockages, infiltration, inflow, and other
conditions that may affect system performance
C. To eliminate the need for preventive maintenance
D. To determine employee staffing levels
Answer: B. To identify defects, blockages, infiltration, inflow,
and other conditions that may affect system performance
Rationale: Sewer system inspection is used to determine the
physical and operational condition of collection-system
components. Inspections can reveal structural defects, root
intrusion, sediment accumulation, illegal connections, infiltration,
inflow, and other problems. Identifying these conditions allows
operators to prioritize maintenance and rehabilitation before
failures occur.
,2. Which inspection method provides a visual examination of
the interior of a sewer pipe using a remotely operated camera?
A. Smoke testing
B. Dye testing
C. Closed-circuit television inspection
D. Pressure testing
Answer: C. Closed-circuit television inspection
Rationale: Closed-circuit television (CCTV) inspection uses a
camera mounted on a remotely controlled crawler or similar
device to examine the inside of sewer pipelines. It allows
operators to document defects such as cracks, fractures,
displaced joints, root intrusion, deposits, holes, and service
connections without excavating the pipe.
3. Before conducting a CCTV inspection, why is it often
necessary to clean the sewer?
A. To increase pipe diameter
B. To remove obstructions and deposits that could conceal
defects or interfere with the camera
C. To disinfect the wastewater
D. To increase groundwater pressure
Answer: B. To remove obstructions and deposits that could
conceal defects or interfere with the camera
Rationale: Sediment, grease, roots, and other deposits can
obstruct the camera's view and prevent the equipment from
traveling through the pipe. Cleaning the sewer before inspection
improves visibility and produces more reliable information about
the pipe's actual condition.
,4. Which condition is most directly associated with
groundwater entering a sewer through defects or joints?
A. Inflow
B. Infiltration
C. Evaporation
D. Recirculation
Answer: B. Infiltration
Rationale: Infiltration is groundwater entering a sewer through
cracks, defective joints, porous materials, broken pipe, manholes,
or other openings below or near the groundwater table. Inflow
generally refers to relatively direct entry of surface water or
stormwater through openings such as roof leaders, yard drains, or
damaged manhole covers.
5. During a CCTV inspection, a circular opening where a
property service line connects to the main sewer should
generally be recorded as what?
A. Service connection
B. Pipe collapse
C. Root intrusion
D. Joint separation
Answer: A. Service connection
Rationale: Service connections are points where lateral sewer
lines connect to the mainline sewer. During CCTV inspection, the
operator should document the location and condition of these
connections, including whether they appear properly connected
, or show defects such as protrusion, leakage, or improper
construction.
6. Which observation would provide the strongest evidence of
root intrusion into a sewer pipe?
A. A smooth pipe wall with no deposits
B. Vegetation or root masses visibly entering through a pipe joint
or crack
C. A properly sealed service connection
D. A clean manhole bench
Answer: B. Vegetation or root masses visibly entering through
a pipe joint or crack
Rationale: Roots commonly enter sewer pipes through cracks,
defective joints, and other openings where moisture and nutrients
are available. During inspection, visible roots extending into the
pipe are direct evidence of root intrusion and may indicate a
continuing structural or joint-sealing problem.
7. What is one important advantage of documenting sewer
defects by their distance from a manhole?
A. It eliminates the need for inspection records
B. It allows maintenance personnel to locate the defect more
accurately
C. It determines wastewater temperature
D. It automatically repairs the defect
Answer: B. It allows maintenance personnel to locate the
defect more accurately
