5/15/25, 9:44 AM ILLINOIS CLASS D WATER LICENSE EXAM (ACTUAL EXAM 2025) | ALL QUESTIONS AND CORRECT ANSWERS | VERIFIED …
ILLINOIS CLASS D WATER LICENSE EXAM
(ACTUAL EXAM 2025) | ALL QUESTIONS AND
CORRECT ANSWERS | VERIFIED ANSWERS |
ALREADY GRADED A+ | LATEST EXAM
Two Towers are both 125 Both will be equal
feet high, when full,
contain 122 feet of water.
Tower 1 holds 150,000
gallons. Tower 2 holds
500,000 gallons. Each has
a pressure gauge at the
base. Which will register
the most pressure in psi?
If the water level in tower 1 51.1 psi
is 118 feet what will the
pressure reading be at the
base
Water that does not contain objectable pollution,
What is the definition of
contamination, or infective agents and is considered
potable water
safe for drinking
What is the first item used Corporation stop
when installing a service
line to a customer?
1/15
, 5/15/25, 9:44 AM ILLINOIS CLASS D WATER LICENSE EXAM (ACTUAL EXAM 2025) | ALL QUESTIONS AND CORRECT ANSWERS | VERIFIED …
If a meter to a residence is curb stop
located in the basement
what should be located
between the water main
and the house
A 5/8" x 3/4" water meter Decreases
serves a residence. Over a
period of years the meter
_ _____in recording actual
water used
To isolate part of a Gate valve
distribution system what
type of valve is commonly
used?
Trihalomethanes (THMs) Reaction of chlorinated water with numeric materials
are caused by? found in surface water sources
The longer the contact Higher
time water and chlorine
residuals enjoy the ________
the THM level will
probably be
THM's should be Cancer
eliminated from finished
water because they cause
?
The maximum contaminant .080 mg/l
level for THM's is?
When collecting THM True
samples one sample must
be taken at a site where
the water has been in the
distribution system the
longest time
2/15
ILLINOIS CLASS D WATER LICENSE EXAM
(ACTUAL EXAM 2025) | ALL QUESTIONS AND
CORRECT ANSWERS | VERIFIED ANSWERS |
ALREADY GRADED A+ | LATEST EXAM
Two Towers are both 125 Both will be equal
feet high, when full,
contain 122 feet of water.
Tower 1 holds 150,000
gallons. Tower 2 holds
500,000 gallons. Each has
a pressure gauge at the
base. Which will register
the most pressure in psi?
If the water level in tower 1 51.1 psi
is 118 feet what will the
pressure reading be at the
base
Water that does not contain objectable pollution,
What is the definition of
contamination, or infective agents and is considered
potable water
safe for drinking
What is the first item used Corporation stop
when installing a service
line to a customer?
1/15
, 5/15/25, 9:44 AM ILLINOIS CLASS D WATER LICENSE EXAM (ACTUAL EXAM 2025) | ALL QUESTIONS AND CORRECT ANSWERS | VERIFIED …
If a meter to a residence is curb stop
located in the basement
what should be located
between the water main
and the house
A 5/8" x 3/4" water meter Decreases
serves a residence. Over a
period of years the meter
_ _____in recording actual
water used
To isolate part of a Gate valve
distribution system what
type of valve is commonly
used?
Trihalomethanes (THMs) Reaction of chlorinated water with numeric materials
are caused by? found in surface water sources
The longer the contact Higher
time water and chlorine
residuals enjoy the ________
the THM level will
probably be
THM's should be Cancer
eliminated from finished
water because they cause
?
The maximum contaminant .080 mg/l
level for THM's is?
When collecting THM True
samples one sample must
be taken at a site where
the water has been in the
distribution system the
longest time
2/15
