Page 1 of 40
TEXAS CLASS A WASTEWATER TREATMENT
LICENSE 2026 EXAM COMPLETE CURRENT
TESTING QUESTIONS AND DETAILED
CORRECT ANSWERS (VERIFIED)
GUARANTEED PASS/TOP-RATED A+.
WASTEWATER
Maximize your success on the Texas Class A Wastewater
Treatment License exam with focused preparation that
strengthens your understanding of preliminary and secondary
treatment processes, disinfection, solids handling, and Texas
Commission on Environmental Quality (TCEQ) regulations for
wastewater facilities. It is specifically designed for wastewater
operators in Texas seeking certification to manage a Class C
treatment facility.
What type of valve is usually used for isolation? ✓ ✓......
ANSWER ....... gate
Carbon monoxide (CO) poisoning symptoms are ✓ ✓......
ANSWER ....... a. tightness in the chest b. nausea c.
drowsiness and headache d. all of the above
, Page 2 of 40
Fresh wastewater is desirable because it is much easier to
treat. The physical characteristics of fresh wastewater are
✓ ✓...... ANSWER ....... dishwater gray in color
The smallest pipe size for air recirculation of a self-priming
centrifugal pump is ✓ ✓...... ANSWER ....... b. 1 inch
Dangerous gases in a confined space may not be detected
with the physical senses because ✓ ✓...... ANSWER .......
a. some gases have no odor b. some gases may deaden the
sense of smell c. some gases may displace the oxygen
What are the dangerous gases a collection system worker
might come into contact with? ✓ ✓...... ANSWER ....... a.
CO2 b. CO c. H,S d. CH, e. all of the above
When designing a wastewater rehab program, the first step
is to ✓ ✓...... ANSWER ....... d. define the objectives of
the program
, Page 3 of 40
The goal of a sanitary wastewater physical survey is to ✓
✓...... ANSWER ....... Identifying problems in the system
need a rehab
When should drop manholes be utilized? ✓ ✓...... ANSWER
....... wastewater velocities greater than ten fps flows
entering the manhole 24 inches or greater above the floor
Sewer balls or pigs are what type of wastewater cleaning
equipment? ✓ ✓...... ANSWER ....... mechanical
cleaning equipment
On a construction job site, equipment booms must maintain
at least how many feet clearance from overhead electric
lines? ✓ ✓...... ANSWER ....... a. 10
How should trench shoring be installed? ✓ ✓...... ANSWER
....... Two above the top of the trench
If an existing centrifugal pump motor is replaced with a
motor with 20 percent more speed, the motor horsepower
, Page 4 of 40
required will increase by ✓ ✓...... ANSWER .......
1.2x1.2x1.2=1.728 73 percent
When setting work goals for an employee, the goals should
be ✓ ✓...... ANSWER ....... accompanied by an action
plan
According to Chapter 317, Design Criteria, a manhole can be
installed within 9 feet of an existing waterline if ✓ ✓......
ANSWER ....... if a. the manhole is completely watertight
and tested for no leakage
As the population of a collection system increases, the ratio
of peak flow to average daily flow will ✓ ✓...... ANSWER
....... decrease
84. One of the most important factors affecting the slope of
a gravity wastewater line is ✓ ✓...... ANSWER ....... pipe
bedding
TEXAS CLASS A WASTEWATER TREATMENT
LICENSE 2026 EXAM COMPLETE CURRENT
TESTING QUESTIONS AND DETAILED
CORRECT ANSWERS (VERIFIED)
GUARANTEED PASS/TOP-RATED A+.
WASTEWATER
Maximize your success on the Texas Class A Wastewater
Treatment License exam with focused preparation that
strengthens your understanding of preliminary and secondary
treatment processes, disinfection, solids handling, and Texas
Commission on Environmental Quality (TCEQ) regulations for
wastewater facilities. It is specifically designed for wastewater
operators in Texas seeking certification to manage a Class C
treatment facility.
What type of valve is usually used for isolation? ✓ ✓......
ANSWER ....... gate
Carbon monoxide (CO) poisoning symptoms are ✓ ✓......
ANSWER ....... a. tightness in the chest b. nausea c.
drowsiness and headache d. all of the above
, Page 2 of 40
Fresh wastewater is desirable because it is much easier to
treat. The physical characteristics of fresh wastewater are
✓ ✓...... ANSWER ....... dishwater gray in color
The smallest pipe size for air recirculation of a self-priming
centrifugal pump is ✓ ✓...... ANSWER ....... b. 1 inch
Dangerous gases in a confined space may not be detected
with the physical senses because ✓ ✓...... ANSWER .......
a. some gases have no odor b. some gases may deaden the
sense of smell c. some gases may displace the oxygen
What are the dangerous gases a collection system worker
might come into contact with? ✓ ✓...... ANSWER ....... a.
CO2 b. CO c. H,S d. CH, e. all of the above
When designing a wastewater rehab program, the first step
is to ✓ ✓...... ANSWER ....... d. define the objectives of
the program
, Page 3 of 40
The goal of a sanitary wastewater physical survey is to ✓
✓...... ANSWER ....... Identifying problems in the system
need a rehab
When should drop manholes be utilized? ✓ ✓...... ANSWER
....... wastewater velocities greater than ten fps flows
entering the manhole 24 inches or greater above the floor
Sewer balls or pigs are what type of wastewater cleaning
equipment? ✓ ✓...... ANSWER ....... mechanical
cleaning equipment
On a construction job site, equipment booms must maintain
at least how many feet clearance from overhead electric
lines? ✓ ✓...... ANSWER ....... a. 10
How should trench shoring be installed? ✓ ✓...... ANSWER
....... Two above the top of the trench
If an existing centrifugal pump motor is replaced with a
motor with 20 percent more speed, the motor horsepower
, Page 4 of 40
required will increase by ✓ ✓...... ANSWER .......
1.2x1.2x1.2=1.728 73 percent
When setting work goals for an employee, the goals should
be ✓ ✓...... ANSWER ....... accompanied by an action
plan
According to Chapter 317, Design Criteria, a manhole can be
installed within 9 feet of an existing waterline if ✓ ✓......
ANSWER ....... if a. the manhole is completely watertight
and tested for no leakage
As the population of a collection system increases, the ratio
of peak flow to average daily flow will ✓ ✓...... ANSWER
....... decrease
84. One of the most important factors affecting the slope of
a gravity wastewater line is ✓ ✓...... ANSWER ....... pipe
bedding
