Page 1 of 219
Georgia Water Treatment Operator Class I Exam
QUESTIONS AND VERIFIED ANSWERS WITH
RATIONALES JUST RELEASED
Georgia Water Treatment Operator Class I Exam
Basic Water Treatment Plant Operations (Core Exam Area)
This is the highest-weighted section of the Georgia Class I Water Treatment Operator Exam. It focuses
on entry-level drinking water treatment plant operations, including fundamental process understanding,
routine plant operation tasks, basic monitoring, and safe operation of treatment equipment. Class I
operators are expected to understand how each treatment step works at a basic operational level and
follow established procedures under supervision in small to medium water systems.
Topics include raw water intake basics, overview of coagulation and flocculation, sedimentation
principles, filtration fundamentals, disinfection concepts, basic chemical dosing awareness, routine plant
walkthrough procedures, basic water quality monitoring, safety procedures in water treatment plants,
and understanding how treated water is delivered into distribution systems.
Coagulation, Flocculation & Sedimentation (Basic Level)
This section focuses on foundational treatment concepts rather than advanced process control.
Topics include understanding how coagulants help remove suspended particles, basic floc formation
concepts, simple mixing and settling principles, introduction to jar testing, basic sedimentation basin
function, sludge accumulation awareness, and recognizing when water clarity improves after treatment
steps. Operators at this level are expected to recognize process purpose rather than perform complex
optimization.
Filtration Systems (Fundamentals)
This is a key entry-level topic for understanding how water is physically cleaned.
Topics include basic rapid sand filtration principles, simple filter operation concepts, filter media
purpose, basic backwashing awareness, understanding turbidity reduction through filtration, recognizing
when filters are operating properly, and identifying obvious filter problems such as cloudy effluent or
reduced flow. Membrane filtration is typically introduced only at a conceptual level.
Disinfection Basics
A major compliance and safety-focused area.
Topics include chlorine as a disinfectant, basic chlorine demand concept, introduction to breakpoint
chlorination, maintaining safe disinfectant levels, contact time (CT) awareness at a basic level, taste and
odor control basics, and understanding why disinfection is required to protect public health. Operators
are expected to understand purpose and safety rather than perform advanced calculations.
Pumping Systems & Plant Flow Basics
Operators must understand how water moves through the system at a fundamental level.
Topics include basic centrifugal pump operation, purpose of pumps in water treatment plants, simple
system flow concepts, identifying major pump components, recognizing pump operation issues (loss of
flow, leaks, unusual noise), and understanding basic water movement from intake through treatment to
storage.
Chemical Handling & Basic Feed Systems
This section introduces safe chemical usage and basic dosing awareness.
Topics include safe handling of treatment chemicals (chlorine, alum, lime), basic understanding of
chemical feed systems, recognizing the role of chemical dosing in treatment, safe storage practices, and
, Page 2 of 219
following operational instructions for chemical systems. Emphasis is placed on safety and correct
handling procedures.
Water Quality Monitoring (Basic Testing)
Class I operators perform routine checks and observe results rather than complex analysis.
Topics include basic turbidity awareness, pH concept introduction, chlorine residual testing basics,
simple field test interpretation, recognizing acceptable vs unacceptable water quality, and reporting
abnormal results to higher-level operators or supervisors.
Safety in Water Treatment Operations
Safety is a major emphasis at all certification levels.
Topics include PPE requirements, chemical safety awareness, chlorine gas safety basics, confined space
awareness, basic electrical safety, spill response procedures, and general plant safety rules. Operators
are expected to follow safety protocols at all times and escalate hazards appropriately.
Distribution System Fundamentals (Basic Awareness)
Operators must understand what happens after treatment.
Topics include basic concept of water distribution systems, maintaining chlorine residual in distribution
lines, storage tank function, water flow to customers, and awareness of cross-connection risks. Detailed
hydraulic analysis is not required at this level.
Regulatory Awareness (Georgia EPD Basics)
This section introduces regulatory responsibility.
Topics include awareness of Georgia Environmental Protection Division (EPD) oversight, understanding
that drinking water must meet Safe Drinking Water Act standards, basic reporting expectations, and
knowing when to escalate operational or water quality issues.
Question 1: A Class I water treatment plant operator notices that the raw water entering the plant has a
distinct earthy or musty taste and odor. Which of the following is the most likely cause of this condition,
and what should the operator do first?
A) Excessive chlorine demand from industrial discharge; increase the chlorine feed rate immediately
B) Algal blooms or decaying organic matter in the source water; report the observation to the shift
supervisor
, Page 3 of 219
C) Corrosion of the distribution system pipes; flush the distribution system at all hydrants
D) High iron and manganese content; adjust the pH of the raw water to 8.5
Answer: B
Rationale: An earthy or musty taste and odor in raw water is frequently caused by algal blooms or
decaying organic matter, such as the compounds geosmin and MIB (2-methylisoborneol), which are
produced by certain algae and bacteria . As a Class I operator, the most appropriate first step is to
document and report the observation to the shift supervisor, who can then coordinate appropriate
treatment adjustments. This ensures that operational changes are made under proper supervision while
protecting public health.
Question 2: During a routine plant walkthrough, a Class I operator observes that the floc particles in the
sedimentation basin are very small and are not settling effectively. Which of the following is the most
likely cause?
A) The coagulant dose is too high
B) The coagulant dose is too low
, Page 4 of 219
C) The water temperature is too high
D) The basin is being cleaned too often
Answer: B
Rationale: When the coagulant dose is insufficient, the particles in the water are not fully destabilized,
resulting in poor floc formation. The "pin floc" (very small particles) will not settle properly, leading to
high turbidity in the settled water . The operator should report this observation and, under supervision,
adjust the chemical feed or collect a sample for jar testing.
Question 3: A Class I operator must document the chlorine residual in the finished water. The standard
test for this measurement is typically performed using which method?
A) DPD colorimetric method using a color comparator or photometer
B) Titration with silver nitrate using a burette
C) Electrical conductivity measurement using a probe
D) Gravimetric analysis after filtering and drying the sample
Georgia Water Treatment Operator Class I Exam
QUESTIONS AND VERIFIED ANSWERS WITH
RATIONALES JUST RELEASED
Georgia Water Treatment Operator Class I Exam
Basic Water Treatment Plant Operations (Core Exam Area)
This is the highest-weighted section of the Georgia Class I Water Treatment Operator Exam. It focuses
on entry-level drinking water treatment plant operations, including fundamental process understanding,
routine plant operation tasks, basic monitoring, and safe operation of treatment equipment. Class I
operators are expected to understand how each treatment step works at a basic operational level and
follow established procedures under supervision in small to medium water systems.
Topics include raw water intake basics, overview of coagulation and flocculation, sedimentation
principles, filtration fundamentals, disinfection concepts, basic chemical dosing awareness, routine plant
walkthrough procedures, basic water quality monitoring, safety procedures in water treatment plants,
and understanding how treated water is delivered into distribution systems.
Coagulation, Flocculation & Sedimentation (Basic Level)
This section focuses on foundational treatment concepts rather than advanced process control.
Topics include understanding how coagulants help remove suspended particles, basic floc formation
concepts, simple mixing and settling principles, introduction to jar testing, basic sedimentation basin
function, sludge accumulation awareness, and recognizing when water clarity improves after treatment
steps. Operators at this level are expected to recognize process purpose rather than perform complex
optimization.
Filtration Systems (Fundamentals)
This is a key entry-level topic for understanding how water is physically cleaned.
Topics include basic rapid sand filtration principles, simple filter operation concepts, filter media
purpose, basic backwashing awareness, understanding turbidity reduction through filtration, recognizing
when filters are operating properly, and identifying obvious filter problems such as cloudy effluent or
reduced flow. Membrane filtration is typically introduced only at a conceptual level.
Disinfection Basics
A major compliance and safety-focused area.
Topics include chlorine as a disinfectant, basic chlorine demand concept, introduction to breakpoint
chlorination, maintaining safe disinfectant levels, contact time (CT) awareness at a basic level, taste and
odor control basics, and understanding why disinfection is required to protect public health. Operators
are expected to understand purpose and safety rather than perform advanced calculations.
Pumping Systems & Plant Flow Basics
Operators must understand how water moves through the system at a fundamental level.
Topics include basic centrifugal pump operation, purpose of pumps in water treatment plants, simple
system flow concepts, identifying major pump components, recognizing pump operation issues (loss of
flow, leaks, unusual noise), and understanding basic water movement from intake through treatment to
storage.
Chemical Handling & Basic Feed Systems
This section introduces safe chemical usage and basic dosing awareness.
Topics include safe handling of treatment chemicals (chlorine, alum, lime), basic understanding of
chemical feed systems, recognizing the role of chemical dosing in treatment, safe storage practices, and
, Page 2 of 219
following operational instructions for chemical systems. Emphasis is placed on safety and correct
handling procedures.
Water Quality Monitoring (Basic Testing)
Class I operators perform routine checks and observe results rather than complex analysis.
Topics include basic turbidity awareness, pH concept introduction, chlorine residual testing basics,
simple field test interpretation, recognizing acceptable vs unacceptable water quality, and reporting
abnormal results to higher-level operators or supervisors.
Safety in Water Treatment Operations
Safety is a major emphasis at all certification levels.
Topics include PPE requirements, chemical safety awareness, chlorine gas safety basics, confined space
awareness, basic electrical safety, spill response procedures, and general plant safety rules. Operators
are expected to follow safety protocols at all times and escalate hazards appropriately.
Distribution System Fundamentals (Basic Awareness)
Operators must understand what happens after treatment.
Topics include basic concept of water distribution systems, maintaining chlorine residual in distribution
lines, storage tank function, water flow to customers, and awareness of cross-connection risks. Detailed
hydraulic analysis is not required at this level.
Regulatory Awareness (Georgia EPD Basics)
This section introduces regulatory responsibility.
Topics include awareness of Georgia Environmental Protection Division (EPD) oversight, understanding
that drinking water must meet Safe Drinking Water Act standards, basic reporting expectations, and
knowing when to escalate operational or water quality issues.
Question 1: A Class I water treatment plant operator notices that the raw water entering the plant has a
distinct earthy or musty taste and odor. Which of the following is the most likely cause of this condition,
and what should the operator do first?
A) Excessive chlorine demand from industrial discharge; increase the chlorine feed rate immediately
B) Algal blooms or decaying organic matter in the source water; report the observation to the shift
supervisor
, Page 3 of 219
C) Corrosion of the distribution system pipes; flush the distribution system at all hydrants
D) High iron and manganese content; adjust the pH of the raw water to 8.5
Answer: B
Rationale: An earthy or musty taste and odor in raw water is frequently caused by algal blooms or
decaying organic matter, such as the compounds geosmin and MIB (2-methylisoborneol), which are
produced by certain algae and bacteria . As a Class I operator, the most appropriate first step is to
document and report the observation to the shift supervisor, who can then coordinate appropriate
treatment adjustments. This ensures that operational changes are made under proper supervision while
protecting public health.
Question 2: During a routine plant walkthrough, a Class I operator observes that the floc particles in the
sedimentation basin are very small and are not settling effectively. Which of the following is the most
likely cause?
A) The coagulant dose is too high
B) The coagulant dose is too low
, Page 4 of 219
C) The water temperature is too high
D) The basin is being cleaned too often
Answer: B
Rationale: When the coagulant dose is insufficient, the particles in the water are not fully destabilized,
resulting in poor floc formation. The "pin floc" (very small particles) will not settle properly, leading to
high turbidity in the settled water . The operator should report this observation and, under supervision,
adjust the chemical feed or collect a sample for jar testing.
Question 3: A Class I operator must document the chlorine residual in the finished water. The standard
test for this measurement is typically performed using which method?
A) DPD colorimetric method using a color comparator or photometer
B) Titration with silver nitrate using a burette
C) Electrical conductivity measurement using a probe
D) Gravimetric analysis after filtering and drying the sample
