ILLINOIS CLASS D WATER LICESNE
EXAM 2026 LATEST UPDATE QUESTIONS
AND CORRECT VERIFIED ANSWERS
ALREADY GRADED A+
If calcium hypochlorite and oily rags are allowed to come into contact with
each other what will occur? - ANS-Ignition and flash fire will occur
When collecting a bacti. Sample The water should be collected after the
Fossett has run for at least? - ANS-A period long enough to
adequately flush out the service line to the main
Poly-pigging of a water main forms what purpose? Disinfected the water
main, seals the inside of the main with a smooth coding, both, or neither?
- ANS-Neither
If a small public water supply pumps 3,000,000 gallons of water in a 30
day period. It's expenses total $8770. How much does it cost this public
water supply to produce 1000 gallons of water? And is this, compared to
the national average, considered high? - ANS-$2.92 per thousand
gallons. And yes it is a high cost
An elevator water tank sits on a bluff overlooking a river valley. The water
level in this tank is 144 feet above the base of the tower. A part of the
distribution system serves homes along the banks of the river. These
homes are 102 feet lower than the base of the water tower. What is the
average system pressure in psi at these homes - ANS-106.5 psi
If a home has a higher pressure than 80 psi what should they install? -
ANS-A pressure reducing valve on their service lines
A 4 inch water main 5000 feet in length than to be flushed long enough to
completely change out the water in the main. How long would it take to
, completely fuss out this line if the fire hydrant the end of the line is
flowing at a rate of 325 gallons per minute? - ANS-10 minutes
What is the invert of the pipe? - ANS-The lowest point of the exterior
of a pipe or conduit
What is OSHA? - ANS-Occupational safety and health administration
What is a specific capacity as related to groundwater - ANS-Weight of a
particle, substance, or chemical solution relation to the weight of
an equal volume of water
What is static water level - ANS-The elevation or level of the water
table and the well pump is not operating
What is a well casting vent - ANS-It allows air to enter well during
drawdown to prevent vacuum conditions, vents excess air during well
recovery
Sounding tube - ANS-Permits insertions of water lever measuring device
device, also used to add cleaning agents
Gravel tube - ANS-Permits operator to see level of gravel and add gravel
as necessary
Pump pedestal - ANS-Supports the weight of the pumping unit
Pump motor base seal - ANS-Provides water tight seal between the motor
base and the concrete support pedestal
Sampling taps - ANS-Permits sampling if pumped water
EXAM 2026 LATEST UPDATE QUESTIONS
AND CORRECT VERIFIED ANSWERS
ALREADY GRADED A+
If calcium hypochlorite and oily rags are allowed to come into contact with
each other what will occur? - ANS-Ignition and flash fire will occur
When collecting a bacti. Sample The water should be collected after the
Fossett has run for at least? - ANS-A period long enough to
adequately flush out the service line to the main
Poly-pigging of a water main forms what purpose? Disinfected the water
main, seals the inside of the main with a smooth coding, both, or neither?
- ANS-Neither
If a small public water supply pumps 3,000,000 gallons of water in a 30
day period. It's expenses total $8770. How much does it cost this public
water supply to produce 1000 gallons of water? And is this, compared to
the national average, considered high? - ANS-$2.92 per thousand
gallons. And yes it is a high cost
An elevator water tank sits on a bluff overlooking a river valley. The water
level in this tank is 144 feet above the base of the tower. A part of the
distribution system serves homes along the banks of the river. These
homes are 102 feet lower than the base of the water tower. What is the
average system pressure in psi at these homes - ANS-106.5 psi
If a home has a higher pressure than 80 psi what should they install? -
ANS-A pressure reducing valve on their service lines
A 4 inch water main 5000 feet in length than to be flushed long enough to
completely change out the water in the main. How long would it take to
, completely fuss out this line if the fire hydrant the end of the line is
flowing at a rate of 325 gallons per minute? - ANS-10 minutes
What is the invert of the pipe? - ANS-The lowest point of the exterior
of a pipe or conduit
What is OSHA? - ANS-Occupational safety and health administration
What is a specific capacity as related to groundwater - ANS-Weight of a
particle, substance, or chemical solution relation to the weight of
an equal volume of water
What is static water level - ANS-The elevation or level of the water
table and the well pump is not operating
What is a well casting vent - ANS-It allows air to enter well during
drawdown to prevent vacuum conditions, vents excess air during well
recovery
Sounding tube - ANS-Permits insertions of water lever measuring device
device, also used to add cleaning agents
Gravel tube - ANS-Permits operator to see level of gravel and add gravel
as necessary
Pump pedestal - ANS-Supports the weight of the pumping unit
Pump motor base seal - ANS-Provides water tight seal between the motor
base and the concrete support pedestal
Sampling taps - ANS-Permits sampling if pumped water
