TCEQ TX CLASS C WASTEWATER
TREATMENT LICENSE EXAM
QUESTIONS AND ANSWERS 2026
VERIFIED.
Preliminary Treatment - ANS 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? - ANS preliminary
treatment
Rotating Biological Contactor - ANS a type of biological secondary treatment process
How are protozoa (cause of amoebic dysentery) destroyed? - ANS disinfection
Other than stream discharge, what are other ways to dispose of effluent wastewater? -
ANS aquifer recharge, evaporation in a pond, and application to farm land by irrigation
Clean Water Act - ANS gives the basic structure for regulating discharges of pollutants into
the waters of the United States
Texas Water Code - ANS gives the TCEQ jurisdiction over discharges of waste into or adjacent
to water in the state
@2026/2027 ALLRIGHTS RESERVED.
,Who reviews plans and specifications for new construction projects before construction begins?
- ANS TCEQ
Water quality fees may be as high as ____________ per permit? - ANS $115,000
Administrative penalties, up to __________ per day for each violation, may be assessed against
any violator. - ANS $25,000
Every city with more than ________ in population needs to establish a water pollution control
program and hire qualified personnel to administer it. - ANS 10,000
State law requires that reports are to be submitted no later than the ________th day of the
following month. - ANS 20
What are major surface waters classified as for the purposes of water quality management and
designation of site-specific standards? - ANS segments
Inflow - ANS 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? -
ANS 100
How much BOD will each person contribute to the wastewater treatment plant each day? -
ANS 0.17
Cause of septic wastewater - ANS bacterial action
@2026/2027 ALLRIGHTS RESERVED.
, Classifications of solids in wastewater - ANS fixed/ash, suspended/dissolved,
organic/inorganic
Organic compounds in wastewater include - ANS carbon, hydrogen and oxygen (animal and
vegetable in nature)
Type of organic matter present in wastewater - ANS proteins
BOD is a measure of what? - ANS oxygen used up
Ways that oxygen can be depleted in streams - ANS untreated waste discharges, algae
masses at night, and high BOD in the effluent
A gas found in treatment systems that is NOT dangerous - ANS dissolved oxygen
Cycles of decay include - ANS carbon, nitrogen and sulfur
A flow totalizer is required when the plant design flow is more than - ANS 0.5 MGD
Non-hazardous wastes include - ANS chlorides, alkalinity, color, phosphorous and iron
Hazardous wastes include - ANS cyanide, sulfides, organics and gasoline
Synergistic Effect - ANS reaction between waste streams
How many cubic feet of screenings per million gallons of wastewater will coarse screens
remove? - ANS 0.5 to 6.0
Preaeration benefits - ANS freshen wastewater, scour gases and remove grease
@2026/2027 ALLRIGHTS RESERVED.
TREATMENT LICENSE EXAM
QUESTIONS AND ANSWERS 2026
VERIFIED.
Preliminary Treatment - ANS 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? - ANS preliminary
treatment
Rotating Biological Contactor - ANS a type of biological secondary treatment process
How are protozoa (cause of amoebic dysentery) destroyed? - ANS disinfection
Other than stream discharge, what are other ways to dispose of effluent wastewater? -
ANS aquifer recharge, evaporation in a pond, and application to farm land by irrigation
Clean Water Act - ANS gives the basic structure for regulating discharges of pollutants into
the waters of the United States
Texas Water Code - ANS gives the TCEQ jurisdiction over discharges of waste into or adjacent
to water in the state
@2026/2027 ALLRIGHTS RESERVED.
,Who reviews plans and specifications for new construction projects before construction begins?
- ANS TCEQ
Water quality fees may be as high as ____________ per permit? - ANS $115,000
Administrative penalties, up to __________ per day for each violation, may be assessed against
any violator. - ANS $25,000
Every city with more than ________ in population needs to establish a water pollution control
program and hire qualified personnel to administer it. - ANS 10,000
State law requires that reports are to be submitted no later than the ________th day of the
following month. - ANS 20
What are major surface waters classified as for the purposes of water quality management and
designation of site-specific standards? - ANS segments
Inflow - ANS 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? -
ANS 100
How much BOD will each person contribute to the wastewater treatment plant each day? -
ANS 0.17
Cause of septic wastewater - ANS bacterial action
@2026/2027 ALLRIGHTS RESERVED.
, Classifications of solids in wastewater - ANS fixed/ash, suspended/dissolved,
organic/inorganic
Organic compounds in wastewater include - ANS carbon, hydrogen and oxygen (animal and
vegetable in nature)
Type of organic matter present in wastewater - ANS proteins
BOD is a measure of what? - ANS oxygen used up
Ways that oxygen can be depleted in streams - ANS untreated waste discharges, algae
masses at night, and high BOD in the effluent
A gas found in treatment systems that is NOT dangerous - ANS dissolved oxygen
Cycles of decay include - ANS carbon, nitrogen and sulfur
A flow totalizer is required when the plant design flow is more than - ANS 0.5 MGD
Non-hazardous wastes include - ANS chlorides, alkalinity, color, phosphorous and iron
Hazardous wastes include - ANS cyanide, sulfides, organics and gasoline
Synergistic Effect - ANS reaction between waste streams
How many cubic feet of screenings per million gallons of wastewater will coarse screens
remove? - ANS 0.5 to 6.0
Preaeration benefits - ANS freshen wastewater, scour gases and remove grease
@2026/2027 ALLRIGHTS RESERVED.
