WATER DISTRIBUTION EXAM SAMPLE TEXT QUESTIONS
WITH CORRECT ANSWERS | 2025/2026
What is the federal law that protects public water supplies from harmful contaminants? -
CORRECT ANSWER -SDWA Safe Drinking Water Act
MCL stands for - CORRECT ANSWER -Maximum Contaminant Level
True or False?
Primary regulations are mandatory - CORRECT ANSWER -TRUE
Secondary regulations are about what 3 things? - CORRECT ANSWER -Taste
Odor
Color of water
True or False?
Secondary regulations are mandatory - CORRECT ANSWER -FALSE
What is the minimum pressure that must be maintained at all times in a distribution system? -
CORRECT ANSWER -20 PSI
The limit for velocity in a system is? - CORRECT ANSWER -5 ft/sec
The spoil pile should be located how far back from the trench wall? - CORRECT ANSWER -2 feet
(min)
,True or False?
A vent in a chlorine room should be located near the ceiling. - CORRECT ANSWER -FALSE
An area is considered unsafe when the oxygen level drops to below
a) 19.5%
b) 20.2%
c) 10.5%
d) 19.25% - CORRECT ANSWER -a) 19.5%
The most common valve used in a distribution
system is
a) butterfly
b) gate
c) ball
d) check - CORRECT ANSWER -b) gate
A chain of custody is required for a sample
a) from collection to disposal
b) from collection to the lab
c) from the lab to disposal
d) all of the above - CORRECT ANSWER -b) from the collection to the lab
, 1 (one) cubic foot of water is _____ lbs
a) 7.48
b) 8.34
c) 27
d) 62.38 - CORRECT ANSWER -d) 62.38
How should a CL2 (chlorine) storage room be vented?
a) mechanically at the floor
b) mechanically at the ceiling
c) in the middle of the wall
d) no ventilation is required - CORRECT ANSWER -a) mechanically at the floor
If a chlorine leak develops in a room where you are working, you should
a) quickly leave the room
b) crawl on the floor and quickly leave the room
c) close your mouth, hold your head as high as possible and quickly leave the room
d) call 911, then leave the room - CORRECT ANSWER -c) close your mouth, hold your head as
high as possible and quickly leave the room
a beard could prevent proper use of what safety equipment?
a) goggles
b) fire extinguisher
WITH CORRECT ANSWERS | 2025/2026
What is the federal law that protects public water supplies from harmful contaminants? -
CORRECT ANSWER -SDWA Safe Drinking Water Act
MCL stands for - CORRECT ANSWER -Maximum Contaminant Level
True or False?
Primary regulations are mandatory - CORRECT ANSWER -TRUE
Secondary regulations are about what 3 things? - CORRECT ANSWER -Taste
Odor
Color of water
True or False?
Secondary regulations are mandatory - CORRECT ANSWER -FALSE
What is the minimum pressure that must be maintained at all times in a distribution system? -
CORRECT ANSWER -20 PSI
The limit for velocity in a system is? - CORRECT ANSWER -5 ft/sec
The spoil pile should be located how far back from the trench wall? - CORRECT ANSWER -2 feet
(min)
,True or False?
A vent in a chlorine room should be located near the ceiling. - CORRECT ANSWER -FALSE
An area is considered unsafe when the oxygen level drops to below
a) 19.5%
b) 20.2%
c) 10.5%
d) 19.25% - CORRECT ANSWER -a) 19.5%
The most common valve used in a distribution
system is
a) butterfly
b) gate
c) ball
d) check - CORRECT ANSWER -b) gate
A chain of custody is required for a sample
a) from collection to disposal
b) from collection to the lab
c) from the lab to disposal
d) all of the above - CORRECT ANSWER -b) from the collection to the lab
, 1 (one) cubic foot of water is _____ lbs
a) 7.48
b) 8.34
c) 27
d) 62.38 - CORRECT ANSWER -d) 62.38
How should a CL2 (chlorine) storage room be vented?
a) mechanically at the floor
b) mechanically at the ceiling
c) in the middle of the wall
d) no ventilation is required - CORRECT ANSWER -a) mechanically at the floor
If a chlorine leak develops in a room where you are working, you should
a) quickly leave the room
b) crawl on the floor and quickly leave the room
c) close your mouth, hold your head as high as possible and quickly leave the room
d) call 911, then leave the room - CORRECT ANSWER -c) close your mouth, hold your head as
high as possible and quickly leave the room
a beard could prevent proper use of what safety equipment?
a) goggles
b) fire extinguisher
