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Texas Wastewater Class C Exam Prep ( 2026/2027 Update) Questions and Answers
Texas Wastewater Class C Exam Prep (
2026/2027 Update) Questions and
Answers
Q: What are major surface waters classified as for the purposes of water quality management
and designation of site-specific standards?
Answer:
segments
Q: Inflow
Answer:
direct discharges of storm water or surface water into a wastewater collection system (storm
drains, roof gutters, yard drains, basement sump pumps and broken manholes and wastewater
lines).
Q: How many gallons per day will each person contribute to the wastewater treatment plant?
Answer:
100
Q: How much BOD will each person contribute to the wastewater treatment plant each day?
Answer:
0.17
Q: Cause of septic wastewater
Answer:
bacterial action
Q: Classifications of solids in wastewater
Answer:
fixed/ash, suspended/dissolved, organic/inorganic
Q: Organic compounds in wastewater include
Answer:
carbon, hydrogen and oxygen (animal and vegetable in nature)
Q: Type of organic matter present in wastewater
Answer:
proteins
Q: BOD is a measure of what?
Answer:
oxygen used up
Q: Ways that oxygen can be depleted in streams
Answer:
untreated waste discharges, algae masses at night, and high BOD in the effluent
Q: A gas found in treatment systems that is NOT dangerous
Answer:
dissolved oxygen
Q: Cycles of decay include
Answer:
carbon, nitrogen and sulfur
Q: A flow totalizer is required when the plant design flow is more than
Answer:
0.5 MGD
Q: Non-hazardous wastes include
Answer:
chlorides, alkalinity, color, phosphorous and iron
Q: Hazardous wastes include
Answer:
cyanide, sulfides, organics and gasoline
Q: Synergistic Effect
Answer:
reaction between waste streams
Q: How many cubic feet of screenings per million gallons of wastewater will coarse screens
remove?
Answer:
0.5 to 6.0
Q: Preaeration benefits
Answer:
freshen wastewater, scour gases and remove grease
Q: Main purpose of sedimentation tank
Answer:
allow scum to rise and solids to settle under quiescent (low velocity) conditions
Q: How much settleable solids is removed in primary settling?
Answer:
90-95%
Q: How much suspended solids is removed in primary settling?
Answer:
50-70%
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