WASTEWATER STUDY GUIDE COMPLETE EXAM REVIEW
WITH VERIFIED ANSWERS | PASS FASTER (2025–2026)
The name of the State Agency responsible for enforcing pollution control laws in Texas is -
a. Texas Water Development Board
b. Texas Water Commission
c. Texas Section of EPA
d. Texas Commission on Environmental Quality e. Texas Water Resource and Conservation
Commission - correct answer -D
The term pathogenic means -
a. Aerobic Bacteria
b. Anaerobic Bacteria
c. Fecal Matter
d. Coliform Bacteria
e. Capable of Causing Disease - correct answer -E
The minimum separation between sewer lines and potable water lines is -
a. 5 feet
b. 7 feet
c. 9 feet
d. 11 feet
e. 24 feet - correct answer -C
A licensed wastewater operator is a professional who - a. Consistently does the best job possible
b. Practices personal safety
c. Strives to improve job knowledge
,d. Strives to keep the plant and collection system in the best appearance and working order
e. All the above - correct answer -E
An important step in testing a sample for Total Suspended Solids (TSS) is -
a. Settling the sample
b. Filtering the sample
c. Incubating the sample
d. Burning the sample
e. Evaporating the sample - correct answer -B
The Biochemical Oxygen Demand (BOD) of a sample is based on -
a. pH readings
b. Measuring Total Suspended Solids (TSS) of a sample
c. Measuring the Dissolved Oxygen (DO) used d. Measuring the anaerobic decomposition
e. Measuring total detention time - correct answer -C
The results of a Biochemical Oxygen Demand (BOD) sample taken at a treatment plant tells the
operator -
a. How the plant is currently operating
b. How the plant was operating 5 days ago
c. How the plant was operating 10 days ago
d. Is of no benefit to the operator
e. How the plant will be performing at TCEQ inspection time - correct answer -B
Which of the following are dangerous gases that are likely to be present in lift stations and or
manholes?
a. Natural gas and Gasoline fumes
,b. Hydrogen Sulfide and Carbon Dioxide
c. Hydrogen, Sulfur, and Argon
d. Oxygen, Nitrogen and Helium
e. Both a & b - correct answer -E
A preferred hydraulic method of cleaning sewer lines is - a. Cable & Auger
b. Continuous Roding Machine
c. Hydro Jet Cleaner
d. Bucket & Belt Press
e. Both a & d - correct answer -C
Which of the following are ways to reduce bad odors coming from a collection system?
a. Aeration & Air Scrubbers
b. Adding Enzymes To The Collection System
c. Routinely cleaning slow running or low flow lines
d. Adding Chlorine or Hydrogen Peroxide to the Collection System
e. Both c & d - correct answer -E
Which of the following types of pipe are commonly used in a wastewater collection system?
a. Vitrified Clay
b. Poly Vinyl Chloride (PVC)
c. Ductile Iron
d. Stainless Steel
e. Both a & b - correct answer -E
Before entering a confined space a worker should -
, a. Use approved monitoring device and check for the presence of dangerous gases
b. Ventilate the space with a blower
c. Wear a safety harness and attach a life line
d. Enter the confined space even if another co-worker in not present
e. a, b, & c - correct answer -E
A properly designed and operated primary sedimentation tank should remove ______ percent
of incoming BOD? a. 10 to 15 %
b. 20 to 30 %
c. 30 to 40 %
d. 35 to 50%
e. None of the above - correct answer -C
Which device may be used to determine the level of sewage in a lift station?
a. Air bubbler tube
b. Parshall Flume
c. Altitude Valve
d. Air Actuated Valve
e. All the above - correct answer -A
What is the most important role of aerobic bacteria in the treatment of wastewater?
a. Enhance organic matter
b. Decompose organic matter
c. Introduce workers to dangerous diseases
d. Enhance oxygen production
e. Produces Odor and Offensive Smells - correct answer -B
WITH VERIFIED ANSWERS | PASS FASTER (2025–2026)
The name of the State Agency responsible for enforcing pollution control laws in Texas is -
a. Texas Water Development Board
b. Texas Water Commission
c. Texas Section of EPA
d. Texas Commission on Environmental Quality e. Texas Water Resource and Conservation
Commission - correct answer -D
The term pathogenic means -
a. Aerobic Bacteria
b. Anaerobic Bacteria
c. Fecal Matter
d. Coliform Bacteria
e. Capable of Causing Disease - correct answer -E
The minimum separation between sewer lines and potable water lines is -
a. 5 feet
b. 7 feet
c. 9 feet
d. 11 feet
e. 24 feet - correct answer -C
A licensed wastewater operator is a professional who - a. Consistently does the best job possible
b. Practices personal safety
c. Strives to improve job knowledge
,d. Strives to keep the plant and collection system in the best appearance and working order
e. All the above - correct answer -E
An important step in testing a sample for Total Suspended Solids (TSS) is -
a. Settling the sample
b. Filtering the sample
c. Incubating the sample
d. Burning the sample
e. Evaporating the sample - correct answer -B
The Biochemical Oxygen Demand (BOD) of a sample is based on -
a. pH readings
b. Measuring Total Suspended Solids (TSS) of a sample
c. Measuring the Dissolved Oxygen (DO) used d. Measuring the anaerobic decomposition
e. Measuring total detention time - correct answer -C
The results of a Biochemical Oxygen Demand (BOD) sample taken at a treatment plant tells the
operator -
a. How the plant is currently operating
b. How the plant was operating 5 days ago
c. How the plant was operating 10 days ago
d. Is of no benefit to the operator
e. How the plant will be performing at TCEQ inspection time - correct answer -B
Which of the following are dangerous gases that are likely to be present in lift stations and or
manholes?
a. Natural gas and Gasoline fumes
,b. Hydrogen Sulfide and Carbon Dioxide
c. Hydrogen, Sulfur, and Argon
d. Oxygen, Nitrogen and Helium
e. Both a & b - correct answer -E
A preferred hydraulic method of cleaning sewer lines is - a. Cable & Auger
b. Continuous Roding Machine
c. Hydro Jet Cleaner
d. Bucket & Belt Press
e. Both a & d - correct answer -C
Which of the following are ways to reduce bad odors coming from a collection system?
a. Aeration & Air Scrubbers
b. Adding Enzymes To The Collection System
c. Routinely cleaning slow running or low flow lines
d. Adding Chlorine or Hydrogen Peroxide to the Collection System
e. Both c & d - correct answer -E
Which of the following types of pipe are commonly used in a wastewater collection system?
a. Vitrified Clay
b. Poly Vinyl Chloride (PVC)
c. Ductile Iron
d. Stainless Steel
e. Both a & b - correct answer -E
Before entering a confined space a worker should -
, a. Use approved monitoring device and check for the presence of dangerous gases
b. Ventilate the space with a blower
c. Wear a safety harness and attach a life line
d. Enter the confined space even if another co-worker in not present
e. a, b, & c - correct answer -E
A properly designed and operated primary sedimentation tank should remove ______ percent
of incoming BOD? a. 10 to 15 %
b. 20 to 30 %
c. 30 to 40 %
d. 35 to 50%
e. None of the above - correct answer -C
Which device may be used to determine the level of sewage in a lift station?
a. Air bubbler tube
b. Parshall Flume
c. Altitude Valve
d. Air Actuated Valve
e. All the above - correct answer -A
What is the most important role of aerobic bacteria in the treatment of wastewater?
a. Enhance organic matter
b. Decompose organic matter
c. Introduce workers to dangerous diseases
d. Enhance oxygen production
e. Produces Odor and Offensive Smells - correct answer -B
