Wastewater Class B Texas
(Updated for 2026) Exam Prep Pack | A+ Questions
180+
& Verified Answers
VERIFIED ANSWERS
Question 1
The name of the State Agency responsible for enforcing pollution control laws in Texas
Correct Answer
Texas Commission of Environmental Quality
Rationale:
The Texas Commission of Environmental Quality (TCEQ) is responsible for enforcing pollution control laws in Texas because it is the primary
state agency tasked with ensuring compliance with environmental regulations and overseeing the reduction of pollution in the state. This
agency's authority is derived from the Texas Legislature and its responsibilities include regulating air and water quality, waste management,
and other environmental issues.
Question 2
The term pathogenic means
Correct Answer
Capable of causing disease
Rationale:
The term "pathogenic" specifically refers to the ability of something, such as a microorganism or agent, to cause disease in a living organism.
This definition is rooted in the word's etymology, where "pathos" means suffering or disease, and "genic" means producing or causing,
indicating that the term's meaning is centered on disease causation.
Question 3
The minimum separation between sewer lines and potable water lines is
Correct Answer
9 feet
Rationale:
The correct answer is based on industry standards and safety guidelines, which dictate that a minimum distance of 9 feet must be maintained
between sewer lines and potable water lines to prevent contamination and ensure the integrity of the water supply system. This distance
allows for adequate separation and minimizes the risk of backflow or cross-connection, which can lead to waterborne illnesses and other health
hazards.
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,Question 4
A licensed wastewater operator is a professional
Correct Answer
consistently does best job possible, practices personal safety, strives to improve job knowledge, strives to keep the plant
and collection system in the best appearance and working order
Rationale:
This answer is correct because it highlights the key characteristics of a professional, such as consistent effort, self-improvement, and a focus on
maintaining a safe and efficient work environment. By demonstrating a commitment to personal safety, job knowledge, and plant upkeep, a
wastewater operator exhibits the qualities of a professional, showcasing expertise and a dedication to their craft.
Question 5
An important step in testing a sample for Total Suspended Solids is
Correct Answer
Filtering a sample
Rationale:
Filtering a sample is an important step in testing for Total Suspended Solids because it separates the solid particles from the liquid portion of
the sample, allowing for a more accurate measurement of the solids concentration. This is crucial because the presence of suspended solids in
the liquid can interfere with the testing process, leading to inaccurate results if not removed.
Question 6
The Biochemical oxygen Demand (BOD) of a sample is based on
Correct Answer
Measuring the dissolved oxygen (DO) used
Rationale:
The Biochemical Oxygen Demand (BOD) of a sample is based on measuring the dissolved oxygen (DO) used because BOD is a measure of the
oxygen consumed by microorganisms as they break down organic matter in water over a specific period of time. This oxygen consumption
indicates the amount of biological activity occurring in the water, which in turn is a measure of the organic pollution level.
Question 7
The results of Biochemical Oxygen Demand (BOD) sample taken at a treatment plant tells the operator
Correct Answer
How the plant was operating 5 days ago
Rationale:
The BOD test measures the amount of oxygen required by microorganisms to break down organic matter in a given sample over a specific
period, usually 5 days, indicating the plant's efficiency in treating wastewater. Therefore, knowing the plant's operation 5 days ago is essential
to understanding the current BOD results, as it reflects the plant's treatment performance during that time frame.
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,Question 8
Which of the following are dangerous gasses that are likely to be present in lift stations and manholes?
Correct Answer
Natural gas, gasoline fumes, hydrogen sulfide and carbon dioxide
Rationale:
The presence of natural gas, gasoline fumes, hydrogen sulfide, and carbon dioxide in lift stations and manholes is primarily due to the potential
for leaks from nearby fuel storage tanks, pipelines, and vehicle traffic, which can seep into these enclosed spaces. These gases pose a
significant risk to human health and safety due to their flammability, toxicity, and ability to displace oxygen, making proper ventilation and
safety protocols essential in these areas.
Question 9
A preferred hydraulic method of cleaning sewer lines is
Correct Answer
Hydro Jet Cleaner
Rationale:
A preferred hydraulic method of cleaning sewer lines is the Hydro Jet Cleaner because it utilizes high-pressure water jets to dislodge debris and
blockages, effectively clearing the sewer lines without causing damage to the infrastructure. This method is particularly effective in removing
grease, roots, and other stubborn obstructions that can cause sewer backups and overflows.
Question 10
Ways to reduce bad odors coming from a collection system
Correct Answer
routinely cleaning slow running or low flow lines, adding chlorine or hydrogen peroxide to the collection system
Rationale:
Cleaning slow running or low flow lines helps to remove trapped organic matter and debris that can contribute to bad odors, while adding
chlorine or hydrogen peroxide to the collection system oxidizes and breaks down these odor-causing substances, reducing their presence. This
process addresses the root cause of the problem, eliminating the sources of bad odors rather than just masking or covering them up.
Question 11
Types of pipe that are commonly used in wastewater collection system
Correct Answer
ductile iron, Poly Vinyl Chloride (PVC)
Rationale:
Ductile iron and PVC pipes are commonly used in wastewater collection systems due to their high durability, resistance to corrosion, and ability
to withstand the harsh conditions found in sewer environments, such as acidic and oxygen-depleted conditions. These characteristics make
them suitable for carrying wastewater, which can be aggressive and potentially damaging to pipes, ensuring the longevity and integrity of the
collection system.
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, Question 12
Before entering a confined space a worker should
Correct Answer
Use approved monitoring device and check for the presence of dangerous gasses, ventilate the space with a blower, wear
a safety harness and attach a life line
Rationale:
Before entering a confined space, a worker should use approved monitoring devices and check for the presence of dangerous gases because it
ensures their safety by detecting potential hazards such as oxygen depletion or toxic gas accumulation. This is crucial to prevent accidents and
ensure a safe working environment, as gases can be invisible and odorless, posing a significant threat to workers' health and lives.
Question 13
A properly designed and operated primary sedimentation tank should remove _____ percent of incoming BOD
Correct Answer
30-40%
Rationale:
A primary sedimentation tank is primarily designed to remove settleable solids and suspended particles from wastewater, rather than dissolved
organic matter that contributes to BOD (Biochemical Oxygen Demand). As a result, it typically removes around 30-40% of the incoming BOD,
as the remaining dissolved organic matter is not easily settleable and requires further treatment processes to remove.
Question 14
Devices that may be used to determine the level of sewage in a lift station
Correct Answer
air bubbler, floats, electrodes, Acoustic (sonic)
Rationale:
These devices are used to measure the level of sewage in a lift station because they are sensitive to changes in the liquid's surface or
vibrations caused by the rising or falling water levels. Each device serves a specific purpose, such as detecting the presence of bubbles in the
air bubbler, floating on the surface, or detecting the electrical resistance changes as electrodes move through the water, and detecting sonic
waves to measure level changes.
Question 15
What is the most important role of aerobic bacteria in the treatment of wastewater?
Correct Answer
decompose organic matter
Rationale:
Aerobic bacteria play a crucial role in wastewater treatment by breaking down the complex organic compounds present in wastewater into
simpler substances through a process that involves decomposing organic matter. This decomposition process is essential for removing
pollutants, reducing odors, and ultimately making wastewater safe for discharge into the environment.
Trusted by thousands of students and professionals worldwide Page 4 of 47
(Updated for 2026) Exam Prep Pack | A+ Questions
180+
& Verified Answers
VERIFIED ANSWERS
Question 1
The name of the State Agency responsible for enforcing pollution control laws in Texas
Correct Answer
Texas Commission of Environmental Quality
Rationale:
The Texas Commission of Environmental Quality (TCEQ) is responsible for enforcing pollution control laws in Texas because it is the primary
state agency tasked with ensuring compliance with environmental regulations and overseeing the reduction of pollution in the state. This
agency's authority is derived from the Texas Legislature and its responsibilities include regulating air and water quality, waste management,
and other environmental issues.
Question 2
The term pathogenic means
Correct Answer
Capable of causing disease
Rationale:
The term "pathogenic" specifically refers to the ability of something, such as a microorganism or agent, to cause disease in a living organism.
This definition is rooted in the word's etymology, where "pathos" means suffering or disease, and "genic" means producing or causing,
indicating that the term's meaning is centered on disease causation.
Question 3
The minimum separation between sewer lines and potable water lines is
Correct Answer
9 feet
Rationale:
The correct answer is based on industry standards and safety guidelines, which dictate that a minimum distance of 9 feet must be maintained
between sewer lines and potable water lines to prevent contamination and ensure the integrity of the water supply system. This distance
allows for adequate separation and minimizes the risk of backflow or cross-connection, which can lead to waterborne illnesses and other health
hazards.
Trusted by thousands of students and professionals worldwide Page 1 of 47
,Question 4
A licensed wastewater operator is a professional
Correct Answer
consistently does best job possible, practices personal safety, strives to improve job knowledge, strives to keep the plant
and collection system in the best appearance and working order
Rationale:
This answer is correct because it highlights the key characteristics of a professional, such as consistent effort, self-improvement, and a focus on
maintaining a safe and efficient work environment. By demonstrating a commitment to personal safety, job knowledge, and plant upkeep, a
wastewater operator exhibits the qualities of a professional, showcasing expertise and a dedication to their craft.
Question 5
An important step in testing a sample for Total Suspended Solids is
Correct Answer
Filtering a sample
Rationale:
Filtering a sample is an important step in testing for Total Suspended Solids because it separates the solid particles from the liquid portion of
the sample, allowing for a more accurate measurement of the solids concentration. This is crucial because the presence of suspended solids in
the liquid can interfere with the testing process, leading to inaccurate results if not removed.
Question 6
The Biochemical oxygen Demand (BOD) of a sample is based on
Correct Answer
Measuring the dissolved oxygen (DO) used
Rationale:
The Biochemical Oxygen Demand (BOD) of a sample is based on measuring the dissolved oxygen (DO) used because BOD is a measure of the
oxygen consumed by microorganisms as they break down organic matter in water over a specific period of time. This oxygen consumption
indicates the amount of biological activity occurring in the water, which in turn is a measure of the organic pollution level.
Question 7
The results of Biochemical Oxygen Demand (BOD) sample taken at a treatment plant tells the operator
Correct Answer
How the plant was operating 5 days ago
Rationale:
The BOD test measures the amount of oxygen required by microorganisms to break down organic matter in a given sample over a specific
period, usually 5 days, indicating the plant's efficiency in treating wastewater. Therefore, knowing the plant's operation 5 days ago is essential
to understanding the current BOD results, as it reflects the plant's treatment performance during that time frame.
Trusted by thousands of students and professionals worldwide Page 2 of 47
,Question 8
Which of the following are dangerous gasses that are likely to be present in lift stations and manholes?
Correct Answer
Natural gas, gasoline fumes, hydrogen sulfide and carbon dioxide
Rationale:
The presence of natural gas, gasoline fumes, hydrogen sulfide, and carbon dioxide in lift stations and manholes is primarily due to the potential
for leaks from nearby fuel storage tanks, pipelines, and vehicle traffic, which can seep into these enclosed spaces. These gases pose a
significant risk to human health and safety due to their flammability, toxicity, and ability to displace oxygen, making proper ventilation and
safety protocols essential in these areas.
Question 9
A preferred hydraulic method of cleaning sewer lines is
Correct Answer
Hydro Jet Cleaner
Rationale:
A preferred hydraulic method of cleaning sewer lines is the Hydro Jet Cleaner because it utilizes high-pressure water jets to dislodge debris and
blockages, effectively clearing the sewer lines without causing damage to the infrastructure. This method is particularly effective in removing
grease, roots, and other stubborn obstructions that can cause sewer backups and overflows.
Question 10
Ways to reduce bad odors coming from a collection system
Correct Answer
routinely cleaning slow running or low flow lines, adding chlorine or hydrogen peroxide to the collection system
Rationale:
Cleaning slow running or low flow lines helps to remove trapped organic matter and debris that can contribute to bad odors, while adding
chlorine or hydrogen peroxide to the collection system oxidizes and breaks down these odor-causing substances, reducing their presence. This
process addresses the root cause of the problem, eliminating the sources of bad odors rather than just masking or covering them up.
Question 11
Types of pipe that are commonly used in wastewater collection system
Correct Answer
ductile iron, Poly Vinyl Chloride (PVC)
Rationale:
Ductile iron and PVC pipes are commonly used in wastewater collection systems due to their high durability, resistance to corrosion, and ability
to withstand the harsh conditions found in sewer environments, such as acidic and oxygen-depleted conditions. These characteristics make
them suitable for carrying wastewater, which can be aggressive and potentially damaging to pipes, ensuring the longevity and integrity of the
collection system.
Trusted by thousands of students and professionals worldwide Page 3 of 47
, Question 12
Before entering a confined space a worker should
Correct Answer
Use approved monitoring device and check for the presence of dangerous gasses, ventilate the space with a blower, wear
a safety harness and attach a life line
Rationale:
Before entering a confined space, a worker should use approved monitoring devices and check for the presence of dangerous gases because it
ensures their safety by detecting potential hazards such as oxygen depletion or toxic gas accumulation. This is crucial to prevent accidents and
ensure a safe working environment, as gases can be invisible and odorless, posing a significant threat to workers' health and lives.
Question 13
A properly designed and operated primary sedimentation tank should remove _____ percent of incoming BOD
Correct Answer
30-40%
Rationale:
A primary sedimentation tank is primarily designed to remove settleable solids and suspended particles from wastewater, rather than dissolved
organic matter that contributes to BOD (Biochemical Oxygen Demand). As a result, it typically removes around 30-40% of the incoming BOD,
as the remaining dissolved organic matter is not easily settleable and requires further treatment processes to remove.
Question 14
Devices that may be used to determine the level of sewage in a lift station
Correct Answer
air bubbler, floats, electrodes, Acoustic (sonic)
Rationale:
These devices are used to measure the level of sewage in a lift station because they are sensitive to changes in the liquid's surface or
vibrations caused by the rising or falling water levels. Each device serves a specific purpose, such as detecting the presence of bubbles in the
air bubbler, floating on the surface, or detecting the electrical resistance changes as electrodes move through the water, and detecting sonic
waves to measure level changes.
Question 15
What is the most important role of aerobic bacteria in the treatment of wastewater?
Correct Answer
decompose organic matter
Rationale:
Aerobic bacteria play a crucial role in wastewater treatment by breaking down the complex organic compounds present in wastewater into
simpler substances through a process that involves decomposing organic matter. This decomposition process is essential for removing
pollutants, reducing odors, and ultimately making wastewater safe for discharge into the environment.
Trusted by thousands of students and professionals worldwide Page 4 of 47
