TEXAS WASTEWATER CLASS C FINAL
EXAM STUDY GUIDE 2025/2026
COMPLETE QUESTIONS AND CORRECT
DETAILED ANSWERS WITH RATIONALES ||
100% GUARANTEED PASS
<RECENT VERSION>
1. Preliminary Treatment - 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.
2. What stage of treatment is grit removal usually accomplished in? -
ANSWER ✓ preliminary treatment
3. Rotating Biological Contactor - ANSWER ✓ a type of biological secondary
treatment process
4. How are protozoa (cause of amoebic dysentery) destroyed? - ANSWER ✓
disinfection
5. Other than stream discharge, what are other ways to dispose of effluent
wastewater? - ANSWER ✓ aquifer recharge, evaporation in a pond, and
application to farm land by irrigation
6. Clean Water Act - ANSWER ✓ gives the basic structure for regulating
discharges of pollutants into the waters of the United States
7. Texas Water Code - ANSWER ✓ gives the TCEQ jurisdiction over
discharges of waste into or adjacent to water in the state
,8. Who reviews plans and specifications for new construction projects before
construction begins? - ANSWER ✓ TCEQ
9. Water quality fees may be as high as ____________ per permit? - ANSWER
✓ $115,000
10.Administrative penalties, up to __________ per day for each violation, may
be assessed against any violator. - ANSWER ✓ $25,000
11.Every city with more than ________ in population needs to establish a water
pollution control program and hire qualified personnel to administer it. -
ANSWER ✓ 10,000
12.State law requires that reports are to be submitted no later than the
________th day of the following month. - ANSWER ✓ 20
13.What are major surface waters classified as for the purposes of water quality
management and designation of site-specific standards? - ANSWER ✓
segments
14.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).
15.How many gallons per day will each person contribute to the wastewater
treatment plant? - ANSWER ✓ 100
16.How much BOD will each person contribute to the wastewater treatment
plant each day? - ANSWER ✓ 0.17
17.Cause of septic wastewater - ANSWER ✓ bacterial action
18.Classifications of solids in wastewater - ANSWER ✓ fixed/ash,
suspended/dissolved, organic/inorganic
19.Organic compounds in wastewater include - ANSWER ✓ carbon, hydrogen
and oxygen (animal and vegetable in nature)
,20.Type of organic matter present in wastewater - ANSWER ✓ proteins
21.BOD is a measure of what? - ANSWER ✓ oxygen used up
22.Ways that oxygen can be depleted in streams - ANSWER ✓ untreated waste
discharges, algae masses at night, and high BOD in the effluent
23.Who sets standards for wastewater treatment? - ANSWER ✓ national, state
and local government
24.Different treatment plants have different requirements for wastewater
treatment (true or false). - ANSWER ✓ True
25.Purpose of primary treatment - ANSWER ✓ removes solids that readily
settle or float
26.Purpose of secondary treatment - ANSWER ✓ microscopic living creatures
(microorganisms) remove additional contaminants
27.Purpose of advanced (tertiary) treatment - ANSWER ✓ reduces specific
contaminants such as suspended solids, ammonia or phosphorous to very
low levels to achieve struct effluent standards
28.What was the first major law to address water pollution? - ANSWER ✓ The
Federal Water Pollution Control Act of 1948
29.What chapter of the Texas Water Code gives the TCEQ jurisdiction over the
discharge of waste into adjacent water in the state? - ANSWER ✓ Ch 26
30.What device(s) can be used as an emergency shut-off for the drive unit of a
circular clarifier? - ANSWER ✓ Shear Pins
31.You are the operator-on-duty. The alarm for the fire detector in the Belt
Filter Press Control Room goes off. What type of fire extinguisher would
you take to respond to this alarm? - ANSWER ✓ Class C
32.When working in an area with two or more floor coverings (for example,
grating and checker-plate), be sure that they are always _____. - ANSWER
✓ Secured together
, 33.When working in confined spaces where flammable gases may be present,
use only toolsmade of - ANSWER ✓ A non sparking alloy
34.A treatment plant should have a valve exercise program in which all plant
valves are exercised (opened and closed) - ANSWER ✓ Once a year
35.Immediate first aid for burns is to? - ANSWER ✓ Flood with cold water
36.Recommended personal hygiene practices to minimize the risk of being
infected by wastewater pathogens include - ANSWER ✓ Changing out of
your work clothes and showering before leaving work
37.What is the best protection against the risk of exposure to infections and
disease at a wastewater plant? - ANSWER ✓ Personal Hygenie
38.Regarding fire extinguisher training in the workplace. The employer must
provide what? - ANSWER ✓ A written and practiced emergency action
plan.
39.The combination of methane and which other gas can be very combustible? -
ANSWER ✓ Oxygen
40.In what location of the sewer manhole would methane gas be found? -
ANSWER ✓ At the top
41.Which type of fire is safe for a pressurized water extinguisher or water hose
to be used on? - ANSWER ✓ Brush
42.Mixing dry granular chlorine (HTH) with petroleum products can cause
which of the following? - ANSWER ✓ Create a fire or explosive condition
43.The fusible plugs found on a 150lb cylinders and one-ton chlorinecontainers
are designed to melt at what temperature range? - ANSWER ✓ 158-165
degrees Fahrenheit
EXAM STUDY GUIDE 2025/2026
COMPLETE QUESTIONS AND CORRECT
DETAILED ANSWERS WITH RATIONALES ||
100% GUARANTEED PASS
<RECENT VERSION>
1. Preliminary Treatment - 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.
2. What stage of treatment is grit removal usually accomplished in? -
ANSWER ✓ preliminary treatment
3. Rotating Biological Contactor - ANSWER ✓ a type of biological secondary
treatment process
4. How are protozoa (cause of amoebic dysentery) destroyed? - ANSWER ✓
disinfection
5. Other than stream discharge, what are other ways to dispose of effluent
wastewater? - ANSWER ✓ aquifer recharge, evaporation in a pond, and
application to farm land by irrigation
6. Clean Water Act - ANSWER ✓ gives the basic structure for regulating
discharges of pollutants into the waters of the United States
7. Texas Water Code - ANSWER ✓ gives the TCEQ jurisdiction over
discharges of waste into or adjacent to water in the state
,8. Who reviews plans and specifications for new construction projects before
construction begins? - ANSWER ✓ TCEQ
9. Water quality fees may be as high as ____________ per permit? - ANSWER
✓ $115,000
10.Administrative penalties, up to __________ per day for each violation, may
be assessed against any violator. - ANSWER ✓ $25,000
11.Every city with more than ________ in population needs to establish a water
pollution control program and hire qualified personnel to administer it. -
ANSWER ✓ 10,000
12.State law requires that reports are to be submitted no later than the
________th day of the following month. - ANSWER ✓ 20
13.What are major surface waters classified as for the purposes of water quality
management and designation of site-specific standards? - ANSWER ✓
segments
14.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).
15.How many gallons per day will each person contribute to the wastewater
treatment plant? - ANSWER ✓ 100
16.How much BOD will each person contribute to the wastewater treatment
plant each day? - ANSWER ✓ 0.17
17.Cause of septic wastewater - ANSWER ✓ bacterial action
18.Classifications of solids in wastewater - ANSWER ✓ fixed/ash,
suspended/dissolved, organic/inorganic
19.Organic compounds in wastewater include - ANSWER ✓ carbon, hydrogen
and oxygen (animal and vegetable in nature)
,20.Type of organic matter present in wastewater - ANSWER ✓ proteins
21.BOD is a measure of what? - ANSWER ✓ oxygen used up
22.Ways that oxygen can be depleted in streams - ANSWER ✓ untreated waste
discharges, algae masses at night, and high BOD in the effluent
23.Who sets standards for wastewater treatment? - ANSWER ✓ national, state
and local government
24.Different treatment plants have different requirements for wastewater
treatment (true or false). - ANSWER ✓ True
25.Purpose of primary treatment - ANSWER ✓ removes solids that readily
settle or float
26.Purpose of secondary treatment - ANSWER ✓ microscopic living creatures
(microorganisms) remove additional contaminants
27.Purpose of advanced (tertiary) treatment - ANSWER ✓ reduces specific
contaminants such as suspended solids, ammonia or phosphorous to very
low levels to achieve struct effluent standards
28.What was the first major law to address water pollution? - ANSWER ✓ The
Federal Water Pollution Control Act of 1948
29.What chapter of the Texas Water Code gives the TCEQ jurisdiction over the
discharge of waste into adjacent water in the state? - ANSWER ✓ Ch 26
30.What device(s) can be used as an emergency shut-off for the drive unit of a
circular clarifier? - ANSWER ✓ Shear Pins
31.You are the operator-on-duty. The alarm for the fire detector in the Belt
Filter Press Control Room goes off. What type of fire extinguisher would
you take to respond to this alarm? - ANSWER ✓ Class C
32.When working in an area with two or more floor coverings (for example,
grating and checker-plate), be sure that they are always _____. - ANSWER
✓ Secured together
, 33.When working in confined spaces where flammable gases may be present,
use only toolsmade of - ANSWER ✓ A non sparking alloy
34.A treatment plant should have a valve exercise program in which all plant
valves are exercised (opened and closed) - ANSWER ✓ Once a year
35.Immediate first aid for burns is to? - ANSWER ✓ Flood with cold water
36.Recommended personal hygiene practices to minimize the risk of being
infected by wastewater pathogens include - ANSWER ✓ Changing out of
your work clothes and showering before leaving work
37.What is the best protection against the risk of exposure to infections and
disease at a wastewater plant? - ANSWER ✓ Personal Hygenie
38.Regarding fire extinguisher training in the workplace. The employer must
provide what? - ANSWER ✓ A written and practiced emergency action
plan.
39.The combination of methane and which other gas can be very combustible? -
ANSWER ✓ Oxygen
40.In what location of the sewer manhole would methane gas be found? -
ANSWER ✓ At the top
41.Which type of fire is safe for a pressurized water extinguisher or water hose
to be used on? - ANSWER ✓ Brush
42.Mixing dry granular chlorine (HTH) with petroleum products can cause
which of the following? - ANSWER ✓ Create a fire or explosive condition
43.The fusible plugs found on a 150lb cylinders and one-ton chlorinecontainers
are designed to melt at what temperature range? - ANSWER ✓ 158-165
degrees Fahrenheit
