WASTEWATER CLASS B TEXAS
EXAMINATION TEST 2026 DETAILED
QUESTIONS AND SOLUTIONS
PROFESSIONAL STUDY MATERIAL
GRADED A+
⩥ The term pathogenic means.
Answer: Capable of causing disease
⩥ The minimum separation between sewer lines and potable water lines
is.
Answer: 9 feet
⩥ 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
dioxide
⩥ 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, Poly Vinyl Chloride (PVC)
⩥ 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,
hydro jet cleaning plugged mains
⩥ When a centrifuge pump loses prime the.
Answer: pump is no longer moving liquid
⩥ A Rotating Biological Contactor (RBC) is.
Answer: fixed firm biological treatment process
⩥ Needs to be checked regularly to properly operate an activated sludge
treatment plant.
Answer: aeration equipment and mixed liquor solids
EXAMINATION TEST 2026 DETAILED
QUESTIONS AND SOLUTIONS
PROFESSIONAL STUDY MATERIAL
GRADED A+
⩥ The term pathogenic means.
Answer: Capable of causing disease
⩥ The minimum separation between sewer lines and potable water lines
is.
Answer: 9 feet
⩥ 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
dioxide
⩥ 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, Poly Vinyl Chloride (PVC)
⩥ 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,
hydro jet cleaning plugged mains
⩥ When a centrifuge pump loses prime the.
Answer: pump is no longer moving liquid
⩥ A Rotating Biological Contactor (RBC) is.
Answer: fixed firm biological treatment process
⩥ Needs to be checked regularly to properly operate an activated sludge
treatment plant.
Answer: aeration equipment and mixed liquor solids
