TEXAS WASTEWATER B Exam Question and
Answer 2026 | Comprehensive Study Pack
with Detailed Rationales | A+ Verified
• The minimum separation between sewer lines and potable water lines is .
ANSWER: Ideally, 9 feet. At least 2 feet above and 4 feet horizontal. Separate
trenches.
• A licensed wastewater operator is a professional . ANSWER: consistently does
best job possible, practices personal safety, strives to improve job knowledge,
strives to keep the plant and collection system in the best appearance and
working order
• An important step in testing a sample for Total Suspended Solids is . ANSWER:
Filtering a sample
• The Biochemical oxygen Demand (BOD) of a sample is based on . ANSWER:
Measuring the dissolved oxygen (DO) used
• The results of Biochemical Oxygen Demand (BOD) sample taken at a treatment
plant tells the operator . ANSWER: How the plant was operating 5 days ago
• Which of the following are dangerous gasses that are likely to be present in lift
stations and manholes? . ANSWER: Natural gas, gasoline fumes, hydrogen sulfide
and carbon monoxide
• A preferred hydraulic method of cleaning sewer lines is . ANSWER: Hydro Jet
Cleaner
,• Ways to reduce bad odors coming from a collection system . ANSWER: routinely
cleaning slow running or low flow lines, adding chlorine or hydrogen peroxide to
the collection system
• Types of pipe that are commonly used in wastewater collection system .
ANSWER: Ductile iron, concrete pipe, vitrified clay, PVC, ABS
• Before entering a confined space a worker should . ANSWER: Use approved
monitoring device and check for the presence of dangerous gasses, ventilate the
space with a blower, wear a safety harness and attach a life line
• A properly designed and operated primary sedimentation tank should remove
_____ percent of incoming BOD . ANSWER: 30-40%
• Devices that may be used to determine the level of sewage in a lift station .
ANSWER: air bubbler, floats, electrodes, Acoustic (sonic)
• What is the most important role of aerobic bacteria in the treatment of
wastewater? . ANSWER: decompose organic matter
• The hydraulic loading of a trickling filter may be determined by . ANSWER: flow
rate and filter area
• These can be used to dewater sludge . ANSWER: belt press, drying beds, solid
bowl centrifuge, gravity thickener
, • Most important to providing adequate sewage treatment in a stabilization pond
. ANSWER: sunlight, algae, bacteria and time
• Offensive and objectionable odors which sometimes occur in trickling filters
usually indicate . ANSWER: septic conditions are present
• Dissolved Oxygen (DO) in aeration tank of an activated sludge plant should be
maintained at or about . ANSWER: 2 to 4 mg/L
• Contributes to the infiltration in a collection system . ANSWER: breaks in the
main lines, high ground water levels, heavy rains
• When a centrifugal pump loses prime the . ANSWER: pump is no longer moving
liquid
• A Rotating Biological Contactor (RBC) is . ANSWER: fixed film biological
treatment process
• Needs to be checked regularly to properly operate an activated sludge
treatment plant . ANSWER: aeration equipment and mixed liquor solids
• Point source discharges are . ANSWER: discharges that come from pipes or
ditches that are monitored, controlled and inspected
(or)
municipal, industrial and agricultural wastewater treatment facilities.
Answer 2026 | Comprehensive Study Pack
with Detailed Rationales | A+ Verified
• The minimum separation between sewer lines and potable water lines is .
ANSWER: Ideally, 9 feet. At least 2 feet above and 4 feet horizontal. Separate
trenches.
• A licensed wastewater operator is a professional . ANSWER: consistently does
best job possible, practices personal safety, strives to improve job knowledge,
strives to keep the plant and collection system in the best appearance and
working order
• An important step in testing a sample for Total Suspended Solids is . ANSWER:
Filtering a sample
• The Biochemical oxygen Demand (BOD) of a sample is based on . ANSWER:
Measuring the dissolved oxygen (DO) used
• The results of Biochemical Oxygen Demand (BOD) sample taken at a treatment
plant tells the operator . ANSWER: How the plant was operating 5 days ago
• Which of the following are dangerous gasses that are likely to be present in lift
stations and manholes? . ANSWER: Natural gas, gasoline fumes, hydrogen sulfide
and carbon monoxide
• A preferred hydraulic method of cleaning sewer lines is . ANSWER: Hydro Jet
Cleaner
,• Ways to reduce bad odors coming from a collection system . ANSWER: routinely
cleaning slow running or low flow lines, adding chlorine or hydrogen peroxide to
the collection system
• Types of pipe that are commonly used in wastewater collection system .
ANSWER: Ductile iron, concrete pipe, vitrified clay, PVC, ABS
• Before entering a confined space a worker should . ANSWER: Use approved
monitoring device and check for the presence of dangerous gasses, ventilate the
space with a blower, wear a safety harness and attach a life line
• A properly designed and operated primary sedimentation tank should remove
_____ percent of incoming BOD . ANSWER: 30-40%
• Devices that may be used to determine the level of sewage in a lift station .
ANSWER: air bubbler, floats, electrodes, Acoustic (sonic)
• What is the most important role of aerobic bacteria in the treatment of
wastewater? . ANSWER: decompose organic matter
• The hydraulic loading of a trickling filter may be determined by . ANSWER: flow
rate and filter area
• These can be used to dewater sludge . ANSWER: belt press, drying beds, solid
bowl centrifuge, gravity thickener
, • Most important to providing adequate sewage treatment in a stabilization pond
. ANSWER: sunlight, algae, bacteria and time
• Offensive and objectionable odors which sometimes occur in trickling filters
usually indicate . ANSWER: septic conditions are present
• Dissolved Oxygen (DO) in aeration tank of an activated sludge plant should be
maintained at or about . ANSWER: 2 to 4 mg/L
• Contributes to the infiltration in a collection system . ANSWER: breaks in the
main lines, high ground water levels, heavy rains
• When a centrifugal pump loses prime the . ANSWER: pump is no longer moving
liquid
• A Rotating Biological Contactor (RBC) is . ANSWER: fixed film biological
treatment process
• Needs to be checked regularly to properly operate an activated sludge
treatment plant . ANSWER: aeration equipment and mixed liquor solids
• Point source discharges are . ANSWER: discharges that come from pipes or
ditches that are monitored, controlled and inspected
(or)
municipal, industrial and agricultural wastewater treatment facilities.
