Class D Water Operator 2025 Latest Ultimate Exam
Prep Test Bank with 900 Questions and Answers with
Definition of Terms/ Water Operator Class D License
Exam Latest 2025-2026 (Most Recent Qs)
What are the three objectives of water treatment - ANSWER-to protect the public
health, to supply an aesthetically pleasing product and to protect consumer
property
Name the 8 treatment required by the TCEQ for all surface water. - ANSWER-
pretreatment, pre-disinfection, taste and odor control, coagulation, sedimentation,
filtration, covered storage, and terminal disinfection
Name 5 methods of controlling taste and odor problems - ANSWER-lake
destratification, algae control, aeration, chemical oxidation, activated carbon
The water system must notify the TCEQ when (5 items) - ANSWER-there is a
change or alteration of the system; a new facility to be build; water supply health
hazards; change in water quality; change in water source
MUDs; Rural Water Supply Corporations; Drainage Districts; Ground Water
Conservation Districts; Subsidence Districts and River Authorities -- These are
what type of agencies and what do they impact? - ANSWER-Regional and local
agencies that impact the water utility industry
Meter readers can be ambassadors of goodwill by doing these 5 things -
ANSWER-wearing identifying clothing; being neat and courteous; Teaching
customers how to read their meter; Explaining utility policies such as delinquent
notices or disputed readings; Taking care or property
pg. 1
,Maintenance crews can warn customers of - ANSWER-service interruptions
Maintenance crews can provide this to protect the public - ANSWER-signs and
barriers
The plant operator is responsible for making the water - ANSWER-safe to drink
and use
Water bills should be 4 things - ANSWER-accurate; itemized; neat; legible
It is important that the utility have a sense of this (attitude) - ANSWER-pride and
professionalism
Name 3 chemicals that are Coagulants - ANSWER-Alum, Ferrous sulfate, Ferric
chloride
Coagulants cause - ANSWER-small particles in water to clot together forming
floc
A positive fecal coliform water sample is considered - ANSWER-Alarming
Bacteriological Samples must be ___________________ of the system -
ANSWER-Representative
Bacteriological Samples must be collected in: - ANSWER-sterile containers.
pg. 2
,This must not happen to bacteriological samples during the sampling process. -
ANSWER-They must not be contaminated.
Name the three types of Test Results - ANSWER-Positive Negative Unsuitable
for Analysis
A Positive Bacteriological Sample means that: - ANSWER-coliform was found
A Negative Bacteriological Sample means that: - ANSWER-coliform was not
found
The first 3 Bacteriological Sample Collection Process (there are a total of 10) -
ANSWER-1. Determine the number of samples required; 2. Develop a written
sample-siting plan; 3. Obtain Sample Containers
Steps 4 through 7 of the Bacteriological Sample Collection Process (there are a
total of 10) - ANSWER-4. Obtain Routine samples from designated; sites; 5.
Flush the service line; 6. Test the chlorine residual; 7. Flame or disinfect the faucet
Steps 8 through 10 of the Bacteriological Sample Collection Process - ANSWER-
8. Fill the sample container; 9. Fill out the form; 10. Send the sample and form to
the laboratory
The minimum number of bacteriological samples required is based on -
ANSWER-the population served (number of people); State and federal Agencies
A sample-siting plan assures that - ANSWER-samples are taken from active
Representative services
pg. 3
, Sample Containers must be - ANSWER-sterile
Sample Containers contain - ANSWER-sodium thiosulfate
The flocculation process - ANSWER-forms larger particles that settle more
readily
Jar Tests - ANSWER-help the operator determine which chemical and how much
to apply
5 things that effect Coagulation - ANSWER-Turbidity, pH, Temperature,
Alkalinity, Chemical dosage
Name 2 Chlorine resistant microorganisms - ANSWER-Giardia, Cryptosporidium
Job training for water utility operators is available through these 3 organizations -
ANSWER-American Water Works Association, Texas Engineering Extension
Service, Texas Water Utilities Association
All public water systems are required to employ certified operators even if the
system only - ANSWER-redistributes treated water bought from another source
cities, municipal utility districts,rural water supply corporations mobile home
parks, campgrounds are examples of: - ANSWER-Public Water Systems
The primary purpose of the Water Utility Industry - ANSWER-The production
and delivery of safe drinking water to consumers
pg. 4
Prep Test Bank with 900 Questions and Answers with
Definition of Terms/ Water Operator Class D License
Exam Latest 2025-2026 (Most Recent Qs)
What are the three objectives of water treatment - ANSWER-to protect the public
health, to supply an aesthetically pleasing product and to protect consumer
property
Name the 8 treatment required by the TCEQ for all surface water. - ANSWER-
pretreatment, pre-disinfection, taste and odor control, coagulation, sedimentation,
filtration, covered storage, and terminal disinfection
Name 5 methods of controlling taste and odor problems - ANSWER-lake
destratification, algae control, aeration, chemical oxidation, activated carbon
The water system must notify the TCEQ when (5 items) - ANSWER-there is a
change or alteration of the system; a new facility to be build; water supply health
hazards; change in water quality; change in water source
MUDs; Rural Water Supply Corporations; Drainage Districts; Ground Water
Conservation Districts; Subsidence Districts and River Authorities -- These are
what type of agencies and what do they impact? - ANSWER-Regional and local
agencies that impact the water utility industry
Meter readers can be ambassadors of goodwill by doing these 5 things -
ANSWER-wearing identifying clothing; being neat and courteous; Teaching
customers how to read their meter; Explaining utility policies such as delinquent
notices or disputed readings; Taking care or property
pg. 1
,Maintenance crews can warn customers of - ANSWER-service interruptions
Maintenance crews can provide this to protect the public - ANSWER-signs and
barriers
The plant operator is responsible for making the water - ANSWER-safe to drink
and use
Water bills should be 4 things - ANSWER-accurate; itemized; neat; legible
It is important that the utility have a sense of this (attitude) - ANSWER-pride and
professionalism
Name 3 chemicals that are Coagulants - ANSWER-Alum, Ferrous sulfate, Ferric
chloride
Coagulants cause - ANSWER-small particles in water to clot together forming
floc
A positive fecal coliform water sample is considered - ANSWER-Alarming
Bacteriological Samples must be ___________________ of the system -
ANSWER-Representative
Bacteriological Samples must be collected in: - ANSWER-sterile containers.
pg. 2
,This must not happen to bacteriological samples during the sampling process. -
ANSWER-They must not be contaminated.
Name the three types of Test Results - ANSWER-Positive Negative Unsuitable
for Analysis
A Positive Bacteriological Sample means that: - ANSWER-coliform was found
A Negative Bacteriological Sample means that: - ANSWER-coliform was not
found
The first 3 Bacteriological Sample Collection Process (there are a total of 10) -
ANSWER-1. Determine the number of samples required; 2. Develop a written
sample-siting plan; 3. Obtain Sample Containers
Steps 4 through 7 of the Bacteriological Sample Collection Process (there are a
total of 10) - ANSWER-4. Obtain Routine samples from designated; sites; 5.
Flush the service line; 6. Test the chlorine residual; 7. Flame or disinfect the faucet
Steps 8 through 10 of the Bacteriological Sample Collection Process - ANSWER-
8. Fill the sample container; 9. Fill out the form; 10. Send the sample and form to
the laboratory
The minimum number of bacteriological samples required is based on -
ANSWER-the population served (number of people); State and federal Agencies
A sample-siting plan assures that - ANSWER-samples are taken from active
Representative services
pg. 3
, Sample Containers must be - ANSWER-sterile
Sample Containers contain - ANSWER-sodium thiosulfate
The flocculation process - ANSWER-forms larger particles that settle more
readily
Jar Tests - ANSWER-help the operator determine which chemical and how much
to apply
5 things that effect Coagulation - ANSWER-Turbidity, pH, Temperature,
Alkalinity, Chemical dosage
Name 2 Chlorine resistant microorganisms - ANSWER-Giardia, Cryptosporidium
Job training for water utility operators is available through these 3 organizations -
ANSWER-American Water Works Association, Texas Engineering Extension
Service, Texas Water Utilities Association
All public water systems are required to employ certified operators even if the
system only - ANSWER-redistributes treated water bought from another source
cities, municipal utility districts,rural water supply corporations mobile home
parks, campgrounds are examples of: - ANSWER-Public Water Systems
The primary purpose of the Water Utility Industry - ANSWER-The production
and delivery of safe drinking water to consumers
pg. 4
