TCEQ Wastewater Collection
System Operator Collection
System Components Exam
Questions and Correct Answers
with Detailed Rationales |
2026/2027 Edition | Exam Prep
Study Guide PDF
1. What is the primary function of a wastewater collection
system?
A. To treat wastewater before discharge
B. To collect and convey wastewater to a treatment facility
C. To disinfect potable water
D. To generate electricity from wastewater
Answer: B. To collect and convey wastewater to a treatment
facility
Rationale: A wastewater collection system is designed to receive
wastewater from homes, businesses, and other sources and
transport it safely to a wastewater treatment facility. Treatment
occurs after collection and conveyance, so collection-system
components primarily focus on moving and controlling
wastewater rather than treating it.
,2. Which component provides access to an underground
sewer for inspection, cleaning, and maintenance?
A. Service lateral
B. Force main
C. Manhole
D. Air-release valve
Answer: C. Manhole
Rationale: A manhole is an access structure installed at strategic
locations in a sewer system. Operators use manholes to inspect
pipelines, perform cleaning and maintenance, observe flow
conditions, and access equipment or connections. Service
laterals connect individual properties to the collection system,
while force mains and air-release valves serve different functions.
3. What is the primary purpose of a sewer service lateral?
A. To connect an individual property to the public sewer system
B. To pump wastewater through a force main
C. To ventilate a wastewater treatment basin
D. To remove grit from wastewater
Answer: A. To connect an individual property to the public
sewer system
Rationale: A service lateral is the portion of the wastewater
collection system that connects a residence, commercial
property, or other source to the main sewer. Proper installation
and maintenance of laterals are important because defective
laterals can allow infiltration, inflow, blockages, and unauthorized
wastewater discharges.
,4. Which component is typically used to transport wastewater
under pressure?
A. Gravity sewer
B. Force main
C. Manhole bench
D. Cleanout
Answer: B. Force main
Rationale: A force main is a pressurized pipeline used to convey
wastewater, usually from a pumping station to a downstream
discharge point. Pumps provide the pressure necessary to move
wastewater through the force main. Unlike gravity sewers, force
mains do not depend primarily on pipe slope for wastewater
movement.
5. What is the primary function of a wastewater lift station?
A. To increase the chlorine concentration of wastewater
B. To remove suspended solids from wastewater
C. To pump wastewater from a lower elevation to a higher
elevation
D. To measure drinking-water pressure
Answer: C. To pump wastewater from a lower elevation to a
higher elevation
Rationale: Lift stations are used when gravity flow cannot
economically or practically carry wastewater to the next point in
the collection system. Pumps lift wastewater to a higher
, elevation, after which it may continue through a gravity sewer or
enter a force main.
6. Which component of a lift station normally prevents large
debris from entering the pumps?
A. Bar screen or screen assembly
B. Air-release valve
C. Sewer manhole
D. Check valve
Answer: A. Bar screen or screen assembly
Rationale: Screening equipment can intercept rags, plastics,
sticks, and other large debris before these materials reach pumps
or downstream equipment. Removing large debris helps reduce
clogging, pump damage, and operational problems.
7. What is the primary purpose of a check valve in a
wastewater pumping system?
A. To increase pump speed
B. To prevent reverse flow
C. To measure wastewater temperature
D. To remove grease from wastewater
Answer: B. To prevent reverse flow
Rationale: A check valve allows flow in the intended direction
while closing when flow attempts to reverse. In a wastewater
pumping system, this helps prevent wastewater in a force main
from flowing backward through the pump when the pump shuts
down.
System Operator Collection
System Components Exam
Questions and Correct Answers
with Detailed Rationales |
2026/2027 Edition | Exam Prep
Study Guide PDF
1. What is the primary function of a wastewater collection
system?
A. To treat wastewater before discharge
B. To collect and convey wastewater to a treatment facility
C. To disinfect potable water
D. To generate electricity from wastewater
Answer: B. To collect and convey wastewater to a treatment
facility
Rationale: A wastewater collection system is designed to receive
wastewater from homes, businesses, and other sources and
transport it safely to a wastewater treatment facility. Treatment
occurs after collection and conveyance, so collection-system
components primarily focus on moving and controlling
wastewater rather than treating it.
,2. Which component provides access to an underground
sewer for inspection, cleaning, and maintenance?
A. Service lateral
B. Force main
C. Manhole
D. Air-release valve
Answer: C. Manhole
Rationale: A manhole is an access structure installed at strategic
locations in a sewer system. Operators use manholes to inspect
pipelines, perform cleaning and maintenance, observe flow
conditions, and access equipment or connections. Service
laterals connect individual properties to the collection system,
while force mains and air-release valves serve different functions.
3. What is the primary purpose of a sewer service lateral?
A. To connect an individual property to the public sewer system
B. To pump wastewater through a force main
C. To ventilate a wastewater treatment basin
D. To remove grit from wastewater
Answer: A. To connect an individual property to the public
sewer system
Rationale: A service lateral is the portion of the wastewater
collection system that connects a residence, commercial
property, or other source to the main sewer. Proper installation
and maintenance of laterals are important because defective
laterals can allow infiltration, inflow, blockages, and unauthorized
wastewater discharges.
,4. Which component is typically used to transport wastewater
under pressure?
A. Gravity sewer
B. Force main
C. Manhole bench
D. Cleanout
Answer: B. Force main
Rationale: A force main is a pressurized pipeline used to convey
wastewater, usually from a pumping station to a downstream
discharge point. Pumps provide the pressure necessary to move
wastewater through the force main. Unlike gravity sewers, force
mains do not depend primarily on pipe slope for wastewater
movement.
5. What is the primary function of a wastewater lift station?
A. To increase the chlorine concentration of wastewater
B. To remove suspended solids from wastewater
C. To pump wastewater from a lower elevation to a higher
elevation
D. To measure drinking-water pressure
Answer: C. To pump wastewater from a lower elevation to a
higher elevation
Rationale: Lift stations are used when gravity flow cannot
economically or practically carry wastewater to the next point in
the collection system. Pumps lift wastewater to a higher
, elevation, after which it may continue through a gravity sewer or
enter a force main.
6. Which component of a lift station normally prevents large
debris from entering the pumps?
A. Bar screen or screen assembly
B. Air-release valve
C. Sewer manhole
D. Check valve
Answer: A. Bar screen or screen assembly
Rationale: Screening equipment can intercept rags, plastics,
sticks, and other large debris before these materials reach pumps
or downstream equipment. Removing large debris helps reduce
clogging, pump damage, and operational problems.
7. What is the primary purpose of a check valve in a
wastewater pumping system?
A. To increase pump speed
B. To prevent reverse flow
C. To measure wastewater temperature
D. To remove grease from wastewater
Answer: B. To prevent reverse flow
Rationale: A check valve allows flow in the intended direction
while closing when flow attempts to reverse. In a wastewater
pumping system, this helps prevent wastewater in a force main
from flowing backward through the pump when the pump shuts
down.
