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Texas Wastewater Class B Exam ( 2026/2027 Update) Questions and Answers
Texas Wastewater Class B Exam (
2026/2027 Update) Questions and
Answers
Q: 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
Q: Types of pipe that are commonly used in wastewater collection system
Answer:
ductile iron, Poly Vinyl Chloride (PVC)
Q: 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
Q: A properly designed and ope primary sedimentation tank should remove _____ percent
of incoming BOD
Answer:
30-40%
Q: Devices that may be used to determine the level of sewage in a lift station
Answer:
air bubbler, floats, electrodes, Acoustic (sonic)
Q: What is the most important role of aerobic bacteria in the treatment of wastewater?
Answer:
decompose organic matter
Q: The hydraulic loading of a trickling filter may be determined by
Answer:
flow rate and filter area
Q: These can be used to dewater sludge
Answer:
belt press, drying beds, solid bowl centrifuge, gravity thickener
Q: Most important to providing adequate sewage treatment in a stabilization pond
Answer:
sunlight, algae, bacteria and time
Q: Offensive and objectionable odors which sometimes occur in trickling filters usually
indicate
Answer:
septic conditions are present
Q: Dissolved Oxygen (DO) in aeration tank of an activated sludge plant should be maintained
at or about
Answer:
2 to 4 mg/L
Q: 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
Q: When a centrifuge pump loses prime the
Answer:
pump is no longer moving liquid
Q: A Rotating Biological Contactor (RBC) is
Answer:
fixed firm biological treatment process
Q: Needs to be checked regularly to properly operate an activated sludge treatment plant
Answer:
aeration equipment and mixed liquor solids
Q: Point source discharges are
Answer:
discharges that come from pipes or ditches that are monitored, controlled and inspected
Q: Non-point discharges are
Answer:
discharges that have intermittent, dispersed flows having little or no control
Q: The Texas Water Code establishes the protection of water quality and quantity of the state
by
Answer:
setting stream standards, issues permits for discharges, identifies non-point source controls, and
establishes water reuse.
Q: The wastewater plant operator is primarily responsible for
Answer:
treating wastewater discharged into the community
Q: Chapter ___ of the Texas Water Code is the state law controlling water pollution and ___
authority to control discharges in Texas
Answer:
Chapter 26 and Texas Commission of Environmental Quality
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