TEXAS CLASS B WASTEWATER EXAM 180
QUESTIONS & CORRECT ANSWERS LATEST
2026/2027
The name of the State Agency responsible for enforcing pollution control laws in
Texas - ANSWER-Texas Commission of Environmental Quality
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
Point source discharges are - ANSWER-discharges that come from pipes or ditches
that are monitored, controlled and inspected
QUESTIONS & CORRECT ANSWERS LATEST
2026/2027
The name of the State Agency responsible for enforcing pollution control laws in
Texas - ANSWER-Texas Commission of Environmental Quality
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
Point source discharges are - ANSWER-discharges that come from pipes or ditches
that are monitored, controlled and inspected
