ILLINOIS CLASS D WATER LICENSE
CERTIFICATION EXAM 2024 FULL QUESTION
SET ONE HUNDRED PERCENT VERIFIED
◉ If the water level in tower 1 is 118 feet what will the pressure reading
be at the base Answer: 51.1 psi
◉ What is the definition of potable water Answer: Water that does not
contain objectable pollution, contamination, or infective agents and is
considered safe for drinking
◉ What is the first item used when installing a service line to a
customer? Answer: Corporation stop
◉ If a meter to a residence is located in the basement what should be
located between the water main and the house Answer: curb stop
◉ A 5/8" x 3/4" water meter serves a residence. Over a period of years
the meter __________ in recording actual water used Answer: Decreases
◉ To isolate part of a distribution system what type of valve is
commonly used? Answer: Gate valve
,◉ Trihalomethanes (THMs) are caused by? Answer: Reaction of
chlorinated water with numeric materials found in surface water sources
◉ The longer the contact time water and chlorine residuals enjoy the
________ the THM level will probably be Answer: Higher
◉ THM's should be eliminated from finished water because they cause ?
Answer: Cancer
◉ The maximum contaminant level for THM's is? Answer: .080 mg/l
◉ When collecting THM samples one sample must be taken at a site
where the water has been in the distribution system the longest time
Answer: True
◉ An applicant for a class d test who has graduated high school but has
no approved training credits must have ____________ "hands on"
experience Answer: 6 months
◉ What type of water main is most likely to become contaminated from
gasoline saturated soil Answer: PVC
◉ What type of materials must not be used as backfill for water mains?
Answer: Cinders
, ◉ Nitrate in levels above _________ mg/L can cause "blue baby"
disease Answer: 10
◉ A boil order must be issued if systems pressure drops below 20 psi or
if contaminated of any part of the system is suspected. Why? Answer: It
is a regulation of the IEPA, and to protect the health of water consumers
◉ A boil order should be issued for? Answer: Until further notice
◉ Upon the issuance of a boil order the IEPA regional office should be
notified of the order because ________________? Answer: It's a state
regulation
◉ The "C" factor of a pipe is _______________? Answer: The
smoothness of the interior of a pipe
◉ The higher the "C" factor of a pipe the _____________ the pipe and
the greater the carrying capacity of the pipe Answer: Smoother
◉ A distribution system that is "looped" instead of having dead ends will
help prevent Answer: Tastes and odors, "dirty" water, and chlorine
depletion
CERTIFICATION EXAM 2024 FULL QUESTION
SET ONE HUNDRED PERCENT VERIFIED
◉ If the water level in tower 1 is 118 feet what will the pressure reading
be at the base Answer: 51.1 psi
◉ What is the definition of potable water Answer: Water that does not
contain objectable pollution, contamination, or infective agents and is
considered safe for drinking
◉ What is the first item used when installing a service line to a
customer? Answer: Corporation stop
◉ If a meter to a residence is located in the basement what should be
located between the water main and the house Answer: curb stop
◉ A 5/8" x 3/4" water meter serves a residence. Over a period of years
the meter __________ in recording actual water used Answer: Decreases
◉ To isolate part of a distribution system what type of valve is
commonly used? Answer: Gate valve
,◉ Trihalomethanes (THMs) are caused by? Answer: Reaction of
chlorinated water with numeric materials found in surface water sources
◉ The longer the contact time water and chlorine residuals enjoy the
________ the THM level will probably be Answer: Higher
◉ THM's should be eliminated from finished water because they cause ?
Answer: Cancer
◉ The maximum contaminant level for THM's is? Answer: .080 mg/l
◉ When collecting THM samples one sample must be taken at a site
where the water has been in the distribution system the longest time
Answer: True
◉ An applicant for a class d test who has graduated high school but has
no approved training credits must have ____________ "hands on"
experience Answer: 6 months
◉ What type of water main is most likely to become contaminated from
gasoline saturated soil Answer: PVC
◉ What type of materials must not be used as backfill for water mains?
Answer: Cinders
, ◉ Nitrate in levels above _________ mg/L can cause "blue baby"
disease Answer: 10
◉ A boil order must be issued if systems pressure drops below 20 psi or
if contaminated of any part of the system is suspected. Why? Answer: It
is a regulation of the IEPA, and to protect the health of water consumers
◉ A boil order should be issued for? Answer: Until further notice
◉ Upon the issuance of a boil order the IEPA regional office should be
notified of the order because ________________? Answer: It's a state
regulation
◉ The "C" factor of a pipe is _______________? Answer: The
smoothness of the interior of a pipe
◉ The higher the "C" factor of a pipe the _____________ the pipe and
the greater the carrying capacity of the pipe Answer: Smoother
◉ A distribution system that is "looped" instead of having dead ends will
help prevent Answer: Tastes and odors, "dirty" water, and chlorine
depletion
