WATER DISTRIBUTION OPERATOR TEST
EXAM 2026 NEWEST STUDY QUESTIONS
WITH CORRECT SOLUTIONS
GUARANTEED PASS RATED A+
,WATER DISTRIBUTION OPERATOR TEST EXAM 2026
NEWEST STUDY QUESTIONS WITH CORRECT
SOLUTIONS GUARANTEED PASS RATED A+
which of the following will occur in the water if organic material is left behind inside a water
main after repair?
a) chlorine demand will increase and chlorine residual will decrease
b) the alkalinity will decrease and the pH will go up
c) tuberculation will occur
d) chlorine residual will go up - Answer>>> a) chlorine demand will increase and chlorine
residual will decrease
Pumps, tanks and water mains that may have been contaminated must be disinfected. Following
disinfection they should not be put to use to supply consumers until
a) the pH of the water is below 6
b) the lines have been back siphoned
c) negative bacteriological test results have been obtained
d) chemical tests of the water have been completed - Answer>>> c) negative bacteriological test
results have been obtained
when comparing the chlorine residuals found in different parts of the distribution system where
would you expect the residual to be the lowest?
a) a point nearest the point of chlorine application
b) a point farthest from the point of chlorine application
c) a point with the shortest residence time in the pipe
d) the point where the water enters the distribution system from the treatment plant - Answer>>>
b) a point farthest from the point of chlorine application
, which of the following is a problem that may occur if the tap to a customer service line is placed
at the top of the water main ?
a) the customers line will be subject to corrosion
b) the customer may get sediment or dirt in their service line
c) the water pressure will be too high
d) the customer may get air in their service line - Answer>>> D) the customer may get air in
their service line
if water is being chlorinated to accomplish the degree of disinfection desired and to maintain the
residual chlorine after a specified contact time, sufficient chlorine dosage must be added to
satisfy the
a) chlorine demand
b) buffer capacity
c) oxygen demand
d) suspended solids - Answer>>> a) chlorine demand
the disinfection power of chlorine depends upon a number of factors. Which of the following has
no known relation to the disinfection power of chlorine?
a) residual chlorine concentration
b) hardness
c) contact time
d) pH - Answer>>> b) hardness
one advantage of "hot or wet tapping" over "dry tapping" a water line is that
a) it is less dangerous because it is not done under pressure
b) no specialized tools are required
c) there is less chance of contamination entering the water main
EXAM 2026 NEWEST STUDY QUESTIONS
WITH CORRECT SOLUTIONS
GUARANTEED PASS RATED A+
,WATER DISTRIBUTION OPERATOR TEST EXAM 2026
NEWEST STUDY QUESTIONS WITH CORRECT
SOLUTIONS GUARANTEED PASS RATED A+
which of the following will occur in the water if organic material is left behind inside a water
main after repair?
a) chlorine demand will increase and chlorine residual will decrease
b) the alkalinity will decrease and the pH will go up
c) tuberculation will occur
d) chlorine residual will go up - Answer>>> a) chlorine demand will increase and chlorine
residual will decrease
Pumps, tanks and water mains that may have been contaminated must be disinfected. Following
disinfection they should not be put to use to supply consumers until
a) the pH of the water is below 6
b) the lines have been back siphoned
c) negative bacteriological test results have been obtained
d) chemical tests of the water have been completed - Answer>>> c) negative bacteriological test
results have been obtained
when comparing the chlorine residuals found in different parts of the distribution system where
would you expect the residual to be the lowest?
a) a point nearest the point of chlorine application
b) a point farthest from the point of chlorine application
c) a point with the shortest residence time in the pipe
d) the point where the water enters the distribution system from the treatment plant - Answer>>>
b) a point farthest from the point of chlorine application
, which of the following is a problem that may occur if the tap to a customer service line is placed
at the top of the water main ?
a) the customers line will be subject to corrosion
b) the customer may get sediment or dirt in their service line
c) the water pressure will be too high
d) the customer may get air in their service line - Answer>>> D) the customer may get air in
their service line
if water is being chlorinated to accomplish the degree of disinfection desired and to maintain the
residual chlorine after a specified contact time, sufficient chlorine dosage must be added to
satisfy the
a) chlorine demand
b) buffer capacity
c) oxygen demand
d) suspended solids - Answer>>> a) chlorine demand
the disinfection power of chlorine depends upon a number of factors. Which of the following has
no known relation to the disinfection power of chlorine?
a) residual chlorine concentration
b) hardness
c) contact time
d) pH - Answer>>> b) hardness
one advantage of "hot or wet tapping" over "dry tapping" a water line is that
a) it is less dangerous because it is not done under pressure
b) no specialized tools are required
c) there is less chance of contamination entering the water main
