TX Class C Wastewater Treatment License
questions and answers 2025\2026 A+ Grade
Preliminary Treatment
- correct answer the 1st stage of sewage treatment where large debris, such as sticks, grit, and rags pas
through a screen followed by a grit chamber, where the flow of water is slowed enough to allow for
sedimentation.
What stage of treatment is grit removal usually accomplished in?
- correct answer preliminary treatment
Rotating Biological Contactor
- correct answer a type of biological secondary treatment process
How are protozoa (cause of amoebic dysentery) destroyed?
- correct answer disinfection
Other than stream discharge, what are other ways to dispose of effluent wastewater?
- correct answer aquifer recharge, evaporation in a pond, and application to farm land by irrigation
Clean Water Act
- correct answer gives the basic structure for regulating discharges of pollutants into the waters of the
United States
Texas Water Code
- correct answer gives the TCEQ jurisdiction over discharges of waste into or adjacent to water in the
state
Who reviews plans and specifications for new construction projects before construction begins?
- correct answer TCEQ
,Water quality fees may be as high as ____________ per permit?
- correct answer $115,000
Administrative penalties, up to __________ per day for each violation, may be assessed against any
violator.
- correct answer $25,000
Every city with more than ________ in population needs to establish a water pollution control program
and hire qualified personnel to administer it.
- correct answer 10,000
State law requires that reports are to be submitted no later than the ________th day of the following
month.
- correct answer 20
What are major surface waters classified as for the purposes of water quality management and
designation of site-specific standards?
- correct answer segments
Inflow
- correct 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).
How many gallons per day will each person contribute to the wastewater treatment plant?
- correct answer 100
How much BOD will each person contribute to the wastewater treatment plant each day?
- correct answer 0.17
Cause of septic wastewater
- correct answer bacterial action
, Classifications of solids in wastewater
- correct answer fixed/ash, suspended/dissolved, organic/inorganic
Organic compounds in wastewater include
- correct answer carbon, hydrogen and oxygen (animal and vegetable in nature)
Type of organic matter present in wastewater
- correct answer proteins
BOD is a measure of what?
- correct answer oxygen used up
Ways that oxygen can be depleted in streams
- correct answer untreated waste discharges, algae masses at night, and high BOD in the effluent
A gas found in treatment systems that is NOT dangerous
- correct answer dissolved oxygen
Cycles of decay include
- correct answer carbon, nitrogen and sulfur
A flow totalizer is required when the plant design flow is more than
- correct answer 0.5 MGD
Non-hazardous wastes include
- correct answer chlorides, alkalinity, color, phosphorous and iron
Hazardous wastes include
- correct answer cyanide, sulfides, organics and gasoline
Synergistic Effect
- correct answer reaction between waste streams
questions and answers 2025\2026 A+ Grade
Preliminary Treatment
- correct answer the 1st stage of sewage treatment where large debris, such as sticks, grit, and rags pas
through a screen followed by a grit chamber, where the flow of water is slowed enough to allow for
sedimentation.
What stage of treatment is grit removal usually accomplished in?
- correct answer preliminary treatment
Rotating Biological Contactor
- correct answer a type of biological secondary treatment process
How are protozoa (cause of amoebic dysentery) destroyed?
- correct answer disinfection
Other than stream discharge, what are other ways to dispose of effluent wastewater?
- correct answer aquifer recharge, evaporation in a pond, and application to farm land by irrigation
Clean Water Act
- correct answer gives the basic structure for regulating discharges of pollutants into the waters of the
United States
Texas Water Code
- correct answer gives the TCEQ jurisdiction over discharges of waste into or adjacent to water in the
state
Who reviews plans and specifications for new construction projects before construction begins?
- correct answer TCEQ
,Water quality fees may be as high as ____________ per permit?
- correct answer $115,000
Administrative penalties, up to __________ per day for each violation, may be assessed against any
violator.
- correct answer $25,000
Every city with more than ________ in population needs to establish a water pollution control program
and hire qualified personnel to administer it.
- correct answer 10,000
State law requires that reports are to be submitted no later than the ________th day of the following
month.
- correct answer 20
What are major surface waters classified as for the purposes of water quality management and
designation of site-specific standards?
- correct answer segments
Inflow
- correct 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).
How many gallons per day will each person contribute to the wastewater treatment plant?
- correct answer 100
How much BOD will each person contribute to the wastewater treatment plant each day?
- correct answer 0.17
Cause of septic wastewater
- correct answer bacterial action
, Classifications of solids in wastewater
- correct answer fixed/ash, suspended/dissolved, organic/inorganic
Organic compounds in wastewater include
- correct answer carbon, hydrogen and oxygen (animal and vegetable in nature)
Type of organic matter present in wastewater
- correct answer proteins
BOD is a measure of what?
- correct answer oxygen used up
Ways that oxygen can be depleted in streams
- correct answer untreated waste discharges, algae masses at night, and high BOD in the effluent
A gas found in treatment systems that is NOT dangerous
- correct answer dissolved oxygen
Cycles of decay include
- correct answer carbon, nitrogen and sulfur
A flow totalizer is required when the plant design flow is more than
- correct answer 0.5 MGD
Non-hazardous wastes include
- correct answer chlorides, alkalinity, color, phosphorous and iron
Hazardous wastes include
- correct answer cyanide, sulfides, organics and gasoline
Synergistic Effect
- correct answer reaction between waste streams
