Wastewater Class A Texas Exam Questions
With Accurate Solutions 2025\2026 A+ Grade
The name of the State Agency responsible for
enforcing pollution control laws in Texas
- accurate answers-Texas Commission of Environmental Quality
The term pathogenic means
- accurate answers-Capable of causing disease
The minimum separation between sewer lines and potable water lines is
- accurate answers-9 feet
A licensed wastewater operator is a professional
- accurate answers-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
- accurate answers-Filtering a sample
The Biochemical oxygen Demand (BOD) of a sample is based on
- accurate answers-Measuring the dissolved oxygen (DO) used
The results of Biochemical Oxygen Demand (BOD)
sample taken at a treatment plant tells the operator
- accurate answers-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?
- accurate answers-Natural gas, gasoline fumes, hydrogen sulfide and carbon
dioxide
A preferred hydraulic method of cleaning sewer lines is
- accurate answers-Hydro Jet Cleaner
,Ways to reduce bad odors coming from a collection system
- accurate answers-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
- accurate answers-ductile iron, Poly Vinyl Chloride (PVC)
Before entering a confined space a worker should
- accurate answers-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
- accurate answers-30-40%
Devices that may be used to determine the level of sewage in a lift station
- accurate answers-air bubbler, floats, electrodes, Acoustic (sonic)
What is the most important role of aerobic bacteria in the treatment of
wastewater?
- accurate answers-decompose organic matter
The hydraulic loading of a trickling filter may be determined by
- accurate answers-flow rate and filter area
These can be used to dewater sludge
- accurate answers-belt press, drying beds, solid bowl centrifuge, gravity
thickener
Most important to providing adequate
sewage treatment in a stabilization pond
- accurate answers-sunlight, algae, bacteria and time
Offensive and objectionable odors which
sometimes occur in trickling filters usually indicate
- accurate answers-septic conditions are present
, Dissolved Oxygen (DO) in aeration tank of an activated
sludge plant should be maintained at or about
- accurate answers-2 to 4 mg/L
Contributes to the infiltration in a collection system
- accurate answers-breaks in the main lines, high ground water levels, heavy
rains, hydro jet cleaning plugged mains
When a centrifuge pump loses prime the
- accurate answers-pump is no longer moving liquid
A Rotating Biological Contactor (RBC) is
- accurate answers-fixed firm biological treatment process
Needs to be checked regularly to properly
operate an activated sludge treatment plant
- accurate answers-aeration equipment and mixed liquor solids
Point source discharges are
- accurate answers-discharges that come from pipes or ditches that are
monitored, controlled and inspected
Non-point discharges are
- accurate answers-discharges that have intermittent, dispersed flows having
little or no control
The Texas Water Code establishes the protection
of water quality and quantity of the state by
- accurate answers-setting stream standards, issues permits for discharges,
identifies non-point source controls, and establishes water reuse.
The wastewater plant operator is primarily responsible for
- accurate answers-treating wastewater discharged into the community
Chapter ___ of the Texas Water Code is the state law controlling
water pollution and ___ authority to control discharges in Texas
- accurate answers-Chapter 26 and Texas Commission on Environmental
Quality
With Accurate Solutions 2025\2026 A+ Grade
The name of the State Agency responsible for
enforcing pollution control laws in Texas
- accurate answers-Texas Commission of Environmental Quality
The term pathogenic means
- accurate answers-Capable of causing disease
The minimum separation between sewer lines and potable water lines is
- accurate answers-9 feet
A licensed wastewater operator is a professional
- accurate answers-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
- accurate answers-Filtering a sample
The Biochemical oxygen Demand (BOD) of a sample is based on
- accurate answers-Measuring the dissolved oxygen (DO) used
The results of Biochemical Oxygen Demand (BOD)
sample taken at a treatment plant tells the operator
- accurate answers-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?
- accurate answers-Natural gas, gasoline fumes, hydrogen sulfide and carbon
dioxide
A preferred hydraulic method of cleaning sewer lines is
- accurate answers-Hydro Jet Cleaner
,Ways to reduce bad odors coming from a collection system
- accurate answers-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
- accurate answers-ductile iron, Poly Vinyl Chloride (PVC)
Before entering a confined space a worker should
- accurate answers-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
- accurate answers-30-40%
Devices that may be used to determine the level of sewage in a lift station
- accurate answers-air bubbler, floats, electrodes, Acoustic (sonic)
What is the most important role of aerobic bacteria in the treatment of
wastewater?
- accurate answers-decompose organic matter
The hydraulic loading of a trickling filter may be determined by
- accurate answers-flow rate and filter area
These can be used to dewater sludge
- accurate answers-belt press, drying beds, solid bowl centrifuge, gravity
thickener
Most important to providing adequate
sewage treatment in a stabilization pond
- accurate answers-sunlight, algae, bacteria and time
Offensive and objectionable odors which
sometimes occur in trickling filters usually indicate
- accurate answers-septic conditions are present
, Dissolved Oxygen (DO) in aeration tank of an activated
sludge plant should be maintained at or about
- accurate answers-2 to 4 mg/L
Contributes to the infiltration in a collection system
- accurate answers-breaks in the main lines, high ground water levels, heavy
rains, hydro jet cleaning plugged mains
When a centrifuge pump loses prime the
- accurate answers-pump is no longer moving liquid
A Rotating Biological Contactor (RBC) is
- accurate answers-fixed firm biological treatment process
Needs to be checked regularly to properly
operate an activated sludge treatment plant
- accurate answers-aeration equipment and mixed liquor solids
Point source discharges are
- accurate answers-discharges that come from pipes or ditches that are
monitored, controlled and inspected
Non-point discharges are
- accurate answers-discharges that have intermittent, dispersed flows having
little or no control
The Texas Water Code establishes the protection
of water quality and quantity of the state by
- accurate answers-setting stream standards, issues permits for discharges,
identifies non-point source controls, and establishes water reuse.
The wastewater plant operator is primarily responsible for
- accurate answers-treating wastewater discharged into the community
Chapter ___ of the Texas Water Code is the state law controlling
water pollution and ___ authority to control discharges in Texas
- accurate answers-Chapter 26 and Texas Commission on Environmental
Quality
