Page 1 of 151
GEORGIA CERTIFIED OPERATOR EXAM QUESTIONS
AND CORRECT ANSWERS WITH RATIONALES
GEORGIA CERTIFIED OPERATOR EXAM
EXAM COVERAGE — 10 MOSTLY TESTED AREAS
1. Water and wastewater treatment fundamentals, treatment objectives, process trains, and
operator responsibilities
2. Operator mathematics, flow calculations, hydraulics, detention time, loading rates, chemical
dosage, and process-control calculations
3. Water treatment processes including coagulation, flocculation, sedimentation, filtration, and
disinfection
4. Wastewater treatment processes including screening, grit removal, primary treatment,
activated sludge, secondary clarification, and biological nutrient removal
5. Groundwater, wells, intakes, pumping systems, storage facilities, distribution, collection
systems, and hydraulic operation
6. Water and wastewater chemistry, microbiology, laboratory testing, sampling, monitoring, and
interpretation of process-control data
7. Sludge and biosolids handling, thickening, digestion, dewatering, disposal, land application,
and solids-process optimization
8. Equipment operation, pumps, valves, electrical systems, instrumentation, maintenance,
troubleshooting, and process safety
9. Georgia regulatory requirements, permits, operator certification, reporting, compliance,
environmental protection, and public-health responsibilities (sos.ga.gov)
10. Occupational safety, chemical handling, confined spaces, emergency response,
documentation, records, and practical operational decision-making
QUESTIONS
1.
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A water treatment operator observes that finished-water turbidity has increased immediately after
filtration while raw-water conditions remain relatively stable; which operational condition should be
investigated first?
A. Filter loading rate and filter performance
B. Finished-water storage tank volume
C. Distribution-system pipe diameter
D. Customer meter-reading frequency
Answer: A
Rationale: Increased finished-water turbidity with otherwise stable source conditions commonly
requires investigation of filter loading, media condition, backwash effectiveness, and filtration
performance.
2.
When calculating the detention time available in a treatment basin, which combination of
measurements provides the fundamental information needed for the calculation?
A. Chemical concentration and temperature
B. Basin volume and flow rate
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C. Pipe diameter and pressure
D. Pump horsepower and voltage
Answer: B
Rationale: Hydraulic detention time is calculated by dividing basin volume by the flow rate through the
basin.
3.
During conventional surface-water treatment, why is coagulation performed before flocculation and
sedimentation under normal operating conditions?
A. To disinfect microorganisms before filtration
B. To increase finished-water alkalinity
C. To destabilize particles so larger flocs can subsequently form
D. To remove dissolved oxygen from the water
Answer: C
Rationale: Coagulation destabilizes colloidal and suspended particles, allowing them to collide and form
larger settleable flocs during flocculation.
4.
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A wastewater operator notices that dissolved oxygen in an aeration basin is consistently below the
facility's desired operating range; what process consequence is most likely?
A. Increased chlorine residual in effluent
B. Improved nitrification automatically
C. Reduced influent hydraulic flow
D. Inadequate biological oxidation and possible process deterioration
Answer: D
Rationale: Insufficient dissolved oxygen can limit aerobic biological activity and may impair carbon
oxidation and nitrification.
5.
Which operational practice most directly helps prevent unauthorized or unsafe chemical exposure when
an operator handles concentrated treatment chemicals?
A. Wearing required PPE and following the applicable safety procedures
B. Increasing the chemical feed rate before opening containers
C. Mixing incompatible chemicals to neutralize them
D. Storing chemicals without identifying labels
GEORGIA CERTIFIED OPERATOR EXAM QUESTIONS
AND CORRECT ANSWERS WITH RATIONALES
GEORGIA CERTIFIED OPERATOR EXAM
EXAM COVERAGE — 10 MOSTLY TESTED AREAS
1. Water and wastewater treatment fundamentals, treatment objectives, process trains, and
operator responsibilities
2. Operator mathematics, flow calculations, hydraulics, detention time, loading rates, chemical
dosage, and process-control calculations
3. Water treatment processes including coagulation, flocculation, sedimentation, filtration, and
disinfection
4. Wastewater treatment processes including screening, grit removal, primary treatment,
activated sludge, secondary clarification, and biological nutrient removal
5. Groundwater, wells, intakes, pumping systems, storage facilities, distribution, collection
systems, and hydraulic operation
6. Water and wastewater chemistry, microbiology, laboratory testing, sampling, monitoring, and
interpretation of process-control data
7. Sludge and biosolids handling, thickening, digestion, dewatering, disposal, land application,
and solids-process optimization
8. Equipment operation, pumps, valves, electrical systems, instrumentation, maintenance,
troubleshooting, and process safety
9. Georgia regulatory requirements, permits, operator certification, reporting, compliance,
environmental protection, and public-health responsibilities (sos.ga.gov)
10. Occupational safety, chemical handling, confined spaces, emergency response,
documentation, records, and practical operational decision-making
QUESTIONS
1.
, Page 2 of 151
A water treatment operator observes that finished-water turbidity has increased immediately after
filtration while raw-water conditions remain relatively stable; which operational condition should be
investigated first?
A. Filter loading rate and filter performance
B. Finished-water storage tank volume
C. Distribution-system pipe diameter
D. Customer meter-reading frequency
Answer: A
Rationale: Increased finished-water turbidity with otherwise stable source conditions commonly
requires investigation of filter loading, media condition, backwash effectiveness, and filtration
performance.
2.
When calculating the detention time available in a treatment basin, which combination of
measurements provides the fundamental information needed for the calculation?
A. Chemical concentration and temperature
B. Basin volume and flow rate
, Page 3 of 151
C. Pipe diameter and pressure
D. Pump horsepower and voltage
Answer: B
Rationale: Hydraulic detention time is calculated by dividing basin volume by the flow rate through the
basin.
3.
During conventional surface-water treatment, why is coagulation performed before flocculation and
sedimentation under normal operating conditions?
A. To disinfect microorganisms before filtration
B. To increase finished-water alkalinity
C. To destabilize particles so larger flocs can subsequently form
D. To remove dissolved oxygen from the water
Answer: C
Rationale: Coagulation destabilizes colloidal and suspended particles, allowing them to collide and form
larger settleable flocs during flocculation.
4.
, Page 4 of 151
A wastewater operator notices that dissolved oxygen in an aeration basin is consistently below the
facility's desired operating range; what process consequence is most likely?
A. Increased chlorine residual in effluent
B. Improved nitrification automatically
C. Reduced influent hydraulic flow
D. Inadequate biological oxidation and possible process deterioration
Answer: D
Rationale: Insufficient dissolved oxygen can limit aerobic biological activity and may impair carbon
oxidation and nitrification.
5.
Which operational practice most directly helps prevent unauthorized or unsafe chemical exposure when
an operator handles concentrated treatment chemicals?
A. Wearing required PPE and following the applicable safety procedures
B. Increasing the chemical feed rate before opening containers
C. Mixing incompatible chemicals to neutralize them
D. Storing chemicals without identifying labels
