Texas Wastewater Class C Exam Prep (Latest 2026/2027 Update) Questions and Verified Answers| 100% Correct

Texas Wastewater Class C Exam Prep (Latest 2026/2027 Update) Questions and Verified Answers| 100% Correct

Texas Wastewater Class C Exam Prep (Latest

2026/2027 Update) Questions and Verified

Answers| 100% Correct

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%