ADEQ Grade 1 Exam Review 2026:
630 Questions (Wastewater
Treatment, Water Distribution & C,
Exams of Water and Wastewater
Engineering
A problem at the wastewater treatment plant B) A sanitary sewer leak C)
Exfiltration from a high water table D) Infiltration from a high water table -
ANSWER//D) Infiltration from a high water table What information would you
consider while clearing a stoppage in a sewer? A) Nothing-start adding
pressurized water to clear the stoppage B) Cause of stoppage C) Time of day
D) Staffing requirements - ANSWER//B) Cause of stoppage With the
completion of a sewer cleaning job, which one of the following must be done
at the manhole? A) Complete and sign timesheets B) Wash down the truck C)
Wash down street around work area, making sure the wash water is broomed
into the M.H. D) None of the above - ANSWER//Wash down street around
work area, making sure the wash water is broomed into the M.H. Lift station
failures include ________ failure. A) dip tube B) electrical system C) inverted
siphon D) All of the above - ANSWER//B) electrical system A kilowatt (KW) is
equivalent to A) .67 amperes at a voltage of 120 B) 746 watts C) 1.34
horsepower D) 1,000 megacycles - ANSWER//C) 1.34 horsepower Infiltration
my result from A) Bad joints B) Improper closed circuit television operation C)
Poor ventilation D) Direct downspout and drain connections - ANSWER//A)
Bad joints Grease in sewers is mechanically removed by A) High-pressure
jets B) Sawing C) Not usually a problem in sewers D) Power rodders -
ANSWER//A) High-pressure jets The most important reason for washing
hands thoroughly after taking a wastewater sample is to A) Avoid being
infected by pathogenic bacteria B) Avoid contaminating BOD bottles C) Avoid
smudging BOD bottles D) Avoid accidentally dropping any glassware -
ANSWER//A) Avoid being infected by pathogenic bacteria Roots can enter
collection systems through A) Air gaps B) Manhole covers C) Pipe cracks D)
Inflatable dams - ANSWER//C) Pipe cracks Which one of the following is a
property of chlorine gas? A) Heavier than air B) Harmless to humans C)
Highly flammable D) Lighter than air - ANSWER//A) Heavier than air What is a
mechanical means to remove material from a sewer? A) Herbicides B) Cutting
C) Pumping D) Sweeping - ANSWER//B) Cutting The purpose of a lift station
sign-in log is to A) Budget lift station visits B) Identify who makes changes in
station operation C) Track employee movement for disciplinary actions D) All
of the above - ANSWER//B) Identify who makes changes in station operation
What information would you consider while clearing a stoppage in a sewer? A)
Nothing-start adding pressurized water to clear the stoppage B) Cause of
stoppage C) Time of day D) Staffing requirements - ANSWER//B) Cause of
,stoppage What tools are used with a power rodder? A) Finger grips B)
Pruning shears C) Spring blades D) Videotape camera - ANSWER//C) Spring
blades Which of the following should be inspected when responding to a lift
station alarm? A) Amount of screenings and trash removals B) Wet well inlet
velocities C) Operation of gas masks D) Motor control center and power panel
- ANSWER//D) Motor control center and power panel The minimum scouring
velocity normally used for sanitary collection lines is A) 1.0 ft/sec B) 2.0 ft/sec
C) 5.0 ft/sec D) 10.0 ft/sec - ANSWER//B) 2.0 ft/sec Tools used for sewer
rodding include A) Lag screw B) Porcupine C) Wildebeest D) Set screw -
ANSWER//B) Porcupine What equipment is effective in removing an
emergency stoppage? A) Strip chart recorder B) Ultrasonic meter C) Front-
end loader D) Hand rodder - ANSWER//D) Hand rodder Employers must
provide employees with information about possible health effects from contact
with hazardous materials. This is called "right-to-know" legislation. Which
document provides "right-to-know"? A) Material Safety Data Sheet B) NPDES
permit C) Sewer ordinance D) Clean Water Act - ANSWER//A) Material Safety
Data Sheet What will happen if the discharge valve on a centrifugal pump is
partially closed? A) Amperage will increase, discharge head will increase B)
Amperage will decrease, discharge head will increase C) Amperage will
decrease, discharge head will remain constant D) Amperage will decrease,
discharge head will decrease - ANSWER//D) Amperage will decrease,
discharge head will decrease As the impeller wears on a pump, the pump
efficiency will A) Decrease B) Improve C) Increase D) Not change -
ANSWER//A) Decrease "Schedule 40" refers to pipe A) flow capacity B)
friction loss C) tubing strength D) wall thickness - ANSWER//D) wall thickness
centrifugal pump parts include A) diaphragm B) piston C) rotor D) volute -
ANSWER//D) volute When packing a centrifugal pump, the-packing gland
should be tightened A) slowly over a period of several hours B) to 20 ft-lb C)
with wrench and then backed off a quarter turn D) none of the above -
ANSWER//A) slowly over a period of several hours A venturi meter measures
quantity of fluid by A) difference in pressure between a constricted and a full-
size portion B) electronic measurement C) velocity of the fluid past a given
point D) weight of the fluid - ANSWER//A) difference in pressure between a
constricted and a full-size portion The gas most commonly associated with
septic wastewater is A) carbon dioxide B) carbon monoxide C) hydrogen
sulfide D) methane - ANSWER//C) hydrogen sulfide When sewer line grades
are too flat, an odor problem is likely to result. The most likely cause of the
odor problem is decreased velocity, which A) Allows decomposable solids to
settle B) Decreases the treatment time in the lines C) Increases the treatment
time of inorganic solids D) None of the above - ANSWER//A) Allows
decomposable solids to settle The formula for calculating the volume of a
cylinder is; A) V = L x W x H B) V = Distance/time C) V = D2 x .785 x D D) V =
D2 x 746 x D - ANSWER//C) V = D2 x .785 x D Biological activity in long,
sluggish-flow, flat-grade sewer lines will likely cause A) Concrete and metal
corrosion B) Oxygen deficiency in the air in manholes, sewers or wet wells. C)
Toxic gas production. D) All of the above. - ANSWER//All of the above. Tasks
performed by a collection system operator include A) Cleaning local treatment
plants. B) Maintaining collection system equipment. C) Making water
connections. D) None of the above. - ANSWER//B) Maintaining collection
, system equipment One cubic foot per second flow is equal to _______ gallons
per hour. A) 2,794 B) 3,500 C) 6,000 D) 26,928 - ANSWER//D) 26,928 On
A pump is delivering less than the expected rate of discharge. What can
cause this to happen? A) Discharge head too low B) Discharge head too high
C) Check valve open D) Pump is primed - ANSWER//B) Discharge head too
high Wearing rings are installed in a pump to - ANSWER//Concentrate wear
on an economically replaceable pan A lantern ring is a - ANSWER//Spacer
ring in a pump packing gland to improve seat water distribution Check valves
are used on the discharge side of centrifugal pumps to - ANSWER//Prevent
water in discharge line from flowing back What information must be on a
warning tag attached to a switch that has been locked out? -
ANSWER//Signature of person who locked out the switch, who is the only
person authorized to remove tag Enclosed, open, and semi-closed are terms
used for the designation and selection of - ANSWER//Impellers Leakage of
seal water around the packing on a centrifugal pump is required because it
acts as a(n) - ANSWER//Lubricant Hydrogen sulfide is a toxic gas that smells
like ____. At high concentrations of hydrogen sulfide, however, the sense of
smell is deadened and no odor is detected. A) Dead fish B) Fuel gas C)
Rotten cabbage D) Rotten eggs - ANSWER//Rotten Eggs Why are gasoline
and volatile solvents objectionable where present in a sewer? A) They
produce an explosion hazard B) They tend to cause the solids to vaporize C)
They will coagulate floatables and cause stoppages D) They represent
wasted recourses - ANSWER//A) They produce an explosion hazard
Biological activity in long, sluggish-flow, flat-grade sewer lines will likely A)
Decrease line sediment B) Create oxygen deficiency in the air in manholes,
sewers, or wet wells C) Stop toxic gas production D) Increase the "carrying
capacity" of the line - ANSWER//B) Create oxygen deficiency in the air in
manholes, sewers, or wet wells Task least likely to be preformed by collection
systems personnel is A) Cleaning sewer stoppages B) Making water
connections C) Inspecting/testing manholes D) Maintaining collection systems
equipment - ANSWER//B) Making water connections A pH of 6.0 is A) Acid B)
Alkaline C) Neutral D) Basic - ANSWER//A) Acid Biological hazards in
collection system operations include A) Noxious or toxic gases or vapors B)
Oxygen deficiency C) Physical injuries D) Hepatitis A - ANSWER//D) Hepatitis
A What must be checked before entering a manhole? A) Atmosphere in
manhole B) Safety equipment C) Proper barricades or warning devices
around a manhole D) All of the above - ANSWER//D) All of the above In
sewer maintenance, what is a pig? A) A bullet shaped object passed through
a force main B) A power rod C) Any foul smelling equipment D) The hydraulic
rodding truck - ANSWER//A) A bullet shaped object passed through a force
main The purpose pf ribs on the outside of a Wayne Sewer Ball is to -
ANSWER//C) Cause jet action to aid in the hydraulic flushing of the sewer line
Mechanical ventilation of a lift station is required to - ANSWER//Ensure safe
working access When opening a power rodder properly, do the following A)
Push the rodding tool into an obstruction and hold it there B) Rotate rod in one
position C) Make sure all the torque is out of a broken rod D) Rod past
dropped joints or through a crushed pipe - ANSWER//C) Make sure all the
torque is out of a broken rod You should get out of the manhole as soon as A)
Lower explosive level alarm activates B) H2S exceeds 5 ppm C) Flow
630 Questions (Wastewater
Treatment, Water Distribution & C,
Exams of Water and Wastewater
Engineering
A problem at the wastewater treatment plant B) A sanitary sewer leak C)
Exfiltration from a high water table D) Infiltration from a high water table -
ANSWER//D) Infiltration from a high water table What information would you
consider while clearing a stoppage in a sewer? A) Nothing-start adding
pressurized water to clear the stoppage B) Cause of stoppage C) Time of day
D) Staffing requirements - ANSWER//B) Cause of stoppage With the
completion of a sewer cleaning job, which one of the following must be done
at the manhole? A) Complete and sign timesheets B) Wash down the truck C)
Wash down street around work area, making sure the wash water is broomed
into the M.H. D) None of the above - ANSWER//Wash down street around
work area, making sure the wash water is broomed into the M.H. Lift station
failures include ________ failure. A) dip tube B) electrical system C) inverted
siphon D) All of the above - ANSWER//B) electrical system A kilowatt (KW) is
equivalent to A) .67 amperes at a voltage of 120 B) 746 watts C) 1.34
horsepower D) 1,000 megacycles - ANSWER//C) 1.34 horsepower Infiltration
my result from A) Bad joints B) Improper closed circuit television operation C)
Poor ventilation D) Direct downspout and drain connections - ANSWER//A)
Bad joints Grease in sewers is mechanically removed by A) High-pressure
jets B) Sawing C) Not usually a problem in sewers D) Power rodders -
ANSWER//A) High-pressure jets The most important reason for washing
hands thoroughly after taking a wastewater sample is to A) Avoid being
infected by pathogenic bacteria B) Avoid contaminating BOD bottles C) Avoid
smudging BOD bottles D) Avoid accidentally dropping any glassware -
ANSWER//A) Avoid being infected by pathogenic bacteria Roots can enter
collection systems through A) Air gaps B) Manhole covers C) Pipe cracks D)
Inflatable dams - ANSWER//C) Pipe cracks Which one of the following is a
property of chlorine gas? A) Heavier than air B) Harmless to humans C)
Highly flammable D) Lighter than air - ANSWER//A) Heavier than air What is a
mechanical means to remove material from a sewer? A) Herbicides B) Cutting
C) Pumping D) Sweeping - ANSWER//B) Cutting The purpose of a lift station
sign-in log is to A) Budget lift station visits B) Identify who makes changes in
station operation C) Track employee movement for disciplinary actions D) All
of the above - ANSWER//B) Identify who makes changes in station operation
What information would you consider while clearing a stoppage in a sewer? A)
Nothing-start adding pressurized water to clear the stoppage B) Cause of
stoppage C) Time of day D) Staffing requirements - ANSWER//B) Cause of
,stoppage What tools are used with a power rodder? A) Finger grips B)
Pruning shears C) Spring blades D) Videotape camera - ANSWER//C) Spring
blades Which of the following should be inspected when responding to a lift
station alarm? A) Amount of screenings and trash removals B) Wet well inlet
velocities C) Operation of gas masks D) Motor control center and power panel
- ANSWER//D) Motor control center and power panel The minimum scouring
velocity normally used for sanitary collection lines is A) 1.0 ft/sec B) 2.0 ft/sec
C) 5.0 ft/sec D) 10.0 ft/sec - ANSWER//B) 2.0 ft/sec Tools used for sewer
rodding include A) Lag screw B) Porcupine C) Wildebeest D) Set screw -
ANSWER//B) Porcupine What equipment is effective in removing an
emergency stoppage? A) Strip chart recorder B) Ultrasonic meter C) Front-
end loader D) Hand rodder - ANSWER//D) Hand rodder Employers must
provide employees with information about possible health effects from contact
with hazardous materials. This is called "right-to-know" legislation. Which
document provides "right-to-know"? A) Material Safety Data Sheet B) NPDES
permit C) Sewer ordinance D) Clean Water Act - ANSWER//A) Material Safety
Data Sheet What will happen if the discharge valve on a centrifugal pump is
partially closed? A) Amperage will increase, discharge head will increase B)
Amperage will decrease, discharge head will increase C) Amperage will
decrease, discharge head will remain constant D) Amperage will decrease,
discharge head will decrease - ANSWER//D) Amperage will decrease,
discharge head will decrease As the impeller wears on a pump, the pump
efficiency will A) Decrease B) Improve C) Increase D) Not change -
ANSWER//A) Decrease "Schedule 40" refers to pipe A) flow capacity B)
friction loss C) tubing strength D) wall thickness - ANSWER//D) wall thickness
centrifugal pump parts include A) diaphragm B) piston C) rotor D) volute -
ANSWER//D) volute When packing a centrifugal pump, the-packing gland
should be tightened A) slowly over a period of several hours B) to 20 ft-lb C)
with wrench and then backed off a quarter turn D) none of the above -
ANSWER//A) slowly over a period of several hours A venturi meter measures
quantity of fluid by A) difference in pressure between a constricted and a full-
size portion B) electronic measurement C) velocity of the fluid past a given
point D) weight of the fluid - ANSWER//A) difference in pressure between a
constricted and a full-size portion The gas most commonly associated with
septic wastewater is A) carbon dioxide B) carbon monoxide C) hydrogen
sulfide D) methane - ANSWER//C) hydrogen sulfide When sewer line grades
are too flat, an odor problem is likely to result. The most likely cause of the
odor problem is decreased velocity, which A) Allows decomposable solids to
settle B) Decreases the treatment time in the lines C) Increases the treatment
time of inorganic solids D) None of the above - ANSWER//A) Allows
decomposable solids to settle The formula for calculating the volume of a
cylinder is; A) V = L x W x H B) V = Distance/time C) V = D2 x .785 x D D) V =
D2 x 746 x D - ANSWER//C) V = D2 x .785 x D Biological activity in long,
sluggish-flow, flat-grade sewer lines will likely cause A) Concrete and metal
corrosion B) Oxygen deficiency in the air in manholes, sewers or wet wells. C)
Toxic gas production. D) All of the above. - ANSWER//All of the above. Tasks
performed by a collection system operator include A) Cleaning local treatment
plants. B) Maintaining collection system equipment. C) Making water
connections. D) None of the above. - ANSWER//B) Maintaining collection
, system equipment One cubic foot per second flow is equal to _______ gallons
per hour. A) 2,794 B) 3,500 C) 6,000 D) 26,928 - ANSWER//D) 26,928 On
A pump is delivering less than the expected rate of discharge. What can
cause this to happen? A) Discharge head too low B) Discharge head too high
C) Check valve open D) Pump is primed - ANSWER//B) Discharge head too
high Wearing rings are installed in a pump to - ANSWER//Concentrate wear
on an economically replaceable pan A lantern ring is a - ANSWER//Spacer
ring in a pump packing gland to improve seat water distribution Check valves
are used on the discharge side of centrifugal pumps to - ANSWER//Prevent
water in discharge line from flowing back What information must be on a
warning tag attached to a switch that has been locked out? -
ANSWER//Signature of person who locked out the switch, who is the only
person authorized to remove tag Enclosed, open, and semi-closed are terms
used for the designation and selection of - ANSWER//Impellers Leakage of
seal water around the packing on a centrifugal pump is required because it
acts as a(n) - ANSWER//Lubricant Hydrogen sulfide is a toxic gas that smells
like ____. At high concentrations of hydrogen sulfide, however, the sense of
smell is deadened and no odor is detected. A) Dead fish B) Fuel gas C)
Rotten cabbage D) Rotten eggs - ANSWER//Rotten Eggs Why are gasoline
and volatile solvents objectionable where present in a sewer? A) They
produce an explosion hazard B) They tend to cause the solids to vaporize C)
They will coagulate floatables and cause stoppages D) They represent
wasted recourses - ANSWER//A) They produce an explosion hazard
Biological activity in long, sluggish-flow, flat-grade sewer lines will likely A)
Decrease line sediment B) Create oxygen deficiency in the air in manholes,
sewers, or wet wells C) Stop toxic gas production D) Increase the "carrying
capacity" of the line - ANSWER//B) Create oxygen deficiency in the air in
manholes, sewers, or wet wells Task least likely to be preformed by collection
systems personnel is A) Cleaning sewer stoppages B) Making water
connections C) Inspecting/testing manholes D) Maintaining collection systems
equipment - ANSWER//B) Making water connections A pH of 6.0 is A) Acid B)
Alkaline C) Neutral D) Basic - ANSWER//A) Acid Biological hazards in
collection system operations include A) Noxious or toxic gases or vapors B)
Oxygen deficiency C) Physical injuries D) Hepatitis A - ANSWER//D) Hepatitis
A What must be checked before entering a manhole? A) Atmosphere in
manhole B) Safety equipment C) Proper barricades or warning devices
around a manhole D) All of the above - ANSWER//D) All of the above In
sewer maintenance, what is a pig? A) A bullet shaped object passed through
a force main B) A power rod C) Any foul smelling equipment D) The hydraulic
rodding truck - ANSWER//A) A bullet shaped object passed through a force
main The purpose pf ribs on the outside of a Wayne Sewer Ball is to -
ANSWER//C) Cause jet action to aid in the hydraulic flushing of the sewer line
Mechanical ventilation of a lift station is required to - ANSWER//Ensure safe
working access When opening a power rodder properly, do the following A)
Push the rodding tool into an obstruction and hold it there B) Rotate rod in one
position C) Make sure all the torque is out of a broken rod D) Rod past
dropped joints or through a crushed pipe - ANSWER//C) Make sure all the
torque is out of a broken rod You should get out of the manhole as soon as A)
Lower explosive level alarm activates B) H2S exceeds 5 ppm C) Flow
