AWWA WATER SYSTEMS GENERAL CERTIFICATION EXAM —
200-QUESTION COMPREHENSIVE TEST BANK COMPLETE
QUESTIONS WITH 100% VERIFIED ANSWERS
Question 1: What is the primary source of groundwater?
A) Ocean water
B) Rivers and streams
C) Precipitation that infiltrates the soil and percolates downward
D) Melting snow only
Answer: C
Rationale: Groundwater originates primarily from precipitation (rain,
snow, sleet) that infiltrates the ground surface and moves downward
through soil and rock until it reaches the saturated zone. This process is
called recharge. While surface water can also contribute, infiltration of
precipitation is the main source.
Question 2: What is an aquifer?
A) A layer of impermeable rock
B) A type of well screen
C) A surface water reservoir
D) A geologic formation that can store and transmit water in usable
quantities
Answer: D
Rationale: An aquifer is a saturated geologic formation that contains
sufficient permeable material to store and transmit water in usable
,quantities to wells and springs. Impermeable layers are called aquitards
or aquicludes, not aquifers.
Question 3: What is the primary purpose of a water distribution
system?
A) To treat raw wastewater
B) To store stormwater runoff
C) To deliver safe drinking water to consumers at adequate pressure and
quantity
D) To generate hydroelectric power
Answer: C
Rationale: The primary purpose of a water distribution system is to
deliver treated, potable water to consumers at adequate pressure and
flow rates while maintaining water quality from the point of entry to
the point of use.
Question 4: Which process is primarily responsible for destabilizing
colloidal particles through the addition of chemicals such as alum or
ferric chloride?
A) Sedimentation
B) Filtration
C) Disinfection
D) Coagulation
Answer: D
Rationale: Coagulation neutralizes the electrical charges on suspended
colloidal particles, allowing them to come together and form larger
aggregates that can be removed in subsequent treatment steps.
Question 5: What is the maximum pressure at service connections
typically recommended to avoid damage to plumbing fixtures?
,A) 100 psi
B) 50 psi
C) 150 psi
D) 200 psi
Answer: A
Rationale: Maximum pressure at service connections should be less
than 100 psi to prevent damage to plumbing fixtures and appliances.
Pressures exceeding this can cause leaks, pipe failures, and premature
wear on fixtures.
Question 6: During flocculation, what is the main objective of gently
mixing the water after coagulant addition?
A) Destroy pathogens
B) Increase dissolved oxygen
C) Promote formation of larger, settleable flocs
D) Remove dissolved gases
Answer: C
Rationale: Gentle mixing during flocculation encourages particle
collisions and aggregation without breaking apart the forming flocs,
resulting in larger, denser flocs that can be effectively removed by
sedimentation and filtration.
Question 7: Which device is used to prevent backflow in a water
system?
A) Pressure relief valve
B) Air gap
C) Flow meter
D) Gate valve
Answer: B
Rationale: An air gap is the most effective backflow prevention device
, because it provides a physical separation between the potable water
supply and any potential source of contamination. Other devices
include reduced pressure zone assemblies and double check valve
assemblies.
Question 8: What does turbidity measure in drinking water?
A) Chemical contamination
B) Microbial concentration
C) Cloudiness caused by suspended particles
D) Color intensity
Answer: C
Rationale: Turbidity measures the cloudiness or haziness of water
caused by suspended particles such as clay, silt, organic matter, and
microorganisms. It is a key indicator of water quality and treatment
effectiveness.
Question 9: What is the primary function of disinfection in water
treatment?
A) Remove turbidity
B) Inactivate pathogenic microorganisms
C) Remove taste and odor
D) Adjust alkalinity
Answer: B
Rationale: Disinfection ensures that harmful bacteria, viruses, and
protozoa are destroyed or rendered harmless. Chlorine is the most
common disinfectant because it provides a lasting residual in the
distribution system.
Question 10: Where does the majority of microbial growth within a
water distribution system occur?
200-QUESTION COMPREHENSIVE TEST BANK COMPLETE
QUESTIONS WITH 100% VERIFIED ANSWERS
Question 1: What is the primary source of groundwater?
A) Ocean water
B) Rivers and streams
C) Precipitation that infiltrates the soil and percolates downward
D) Melting snow only
Answer: C
Rationale: Groundwater originates primarily from precipitation (rain,
snow, sleet) that infiltrates the ground surface and moves downward
through soil and rock until it reaches the saturated zone. This process is
called recharge. While surface water can also contribute, infiltration of
precipitation is the main source.
Question 2: What is an aquifer?
A) A layer of impermeable rock
B) A type of well screen
C) A surface water reservoir
D) A geologic formation that can store and transmit water in usable
quantities
Answer: D
Rationale: An aquifer is a saturated geologic formation that contains
sufficient permeable material to store and transmit water in usable
,quantities to wells and springs. Impermeable layers are called aquitards
or aquicludes, not aquifers.
Question 3: What is the primary purpose of a water distribution
system?
A) To treat raw wastewater
B) To store stormwater runoff
C) To deliver safe drinking water to consumers at adequate pressure and
quantity
D) To generate hydroelectric power
Answer: C
Rationale: The primary purpose of a water distribution system is to
deliver treated, potable water to consumers at adequate pressure and
flow rates while maintaining water quality from the point of entry to
the point of use.
Question 4: Which process is primarily responsible for destabilizing
colloidal particles through the addition of chemicals such as alum or
ferric chloride?
A) Sedimentation
B) Filtration
C) Disinfection
D) Coagulation
Answer: D
Rationale: Coagulation neutralizes the electrical charges on suspended
colloidal particles, allowing them to come together and form larger
aggregates that can be removed in subsequent treatment steps.
Question 5: What is the maximum pressure at service connections
typically recommended to avoid damage to plumbing fixtures?
,A) 100 psi
B) 50 psi
C) 150 psi
D) 200 psi
Answer: A
Rationale: Maximum pressure at service connections should be less
than 100 psi to prevent damage to plumbing fixtures and appliances.
Pressures exceeding this can cause leaks, pipe failures, and premature
wear on fixtures.
Question 6: During flocculation, what is the main objective of gently
mixing the water after coagulant addition?
A) Destroy pathogens
B) Increase dissolved oxygen
C) Promote formation of larger, settleable flocs
D) Remove dissolved gases
Answer: C
Rationale: Gentle mixing during flocculation encourages particle
collisions and aggregation without breaking apart the forming flocs,
resulting in larger, denser flocs that can be effectively removed by
sedimentation and filtration.
Question 7: Which device is used to prevent backflow in a water
system?
A) Pressure relief valve
B) Air gap
C) Flow meter
D) Gate valve
Answer: B
Rationale: An air gap is the most effective backflow prevention device
, because it provides a physical separation between the potable water
supply and any potential source of contamination. Other devices
include reduced pressure zone assemblies and double check valve
assemblies.
Question 8: What does turbidity measure in drinking water?
A) Chemical contamination
B) Microbial concentration
C) Cloudiness caused by suspended particles
D) Color intensity
Answer: C
Rationale: Turbidity measures the cloudiness or haziness of water
caused by suspended particles such as clay, silt, organic matter, and
microorganisms. It is a key indicator of water quality and treatment
effectiveness.
Question 9: What is the primary function of disinfection in water
treatment?
A) Remove turbidity
B) Inactivate pathogenic microorganisms
C) Remove taste and odor
D) Adjust alkalinity
Answer: B
Rationale: Disinfection ensures that harmful bacteria, viruses, and
protozoa are destroyed or rendered harmless. Chlorine is the most
common disinfectant because it provides a lasting residual in the
distribution system.
Question 10: Where does the majority of microbial growth within a
water distribution system occur?
