1|Page
TEXAS CLASS D WATER FINAL EXAM 2026 EXAM 2
VERSIONS ACCURATE ACTUAL EXAM ||VERIFIED
QUESTIONS||FREQUENTLY TESTED QUESTIONS
WITH DETAILED ANSWERS | GUARANTEED PASS |
GRADED A+ | NEWEST EXAM!!!
Which of the following is part of a hypochlorination
system?
a) solution feed pump
b) gas cylinder
c) rotameter
d) injector/ejector
e) all of the above - Answers-a) solution feed pump
An elevated storage tank should be protected against
corrosion by:
a) painting
b) cathodic protection
c) water stabilization
d) all of the above
e) galvanizing - Answers-d) all of the above (painting,
cathodic protection, and water stabilization)
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The pH of water indicates whether it is acidic or basic and
is expressed by a scale of numbers ranging from:
a) 0 - 7
b) 0 - 14
c) 1 - 7
d) 1 - 14
e) none of the above - Answers-b) 0 - 14
Before a new main is placed into service, it must be
properly disinfected with a minimum chlorine dosage of:
a) 50 mg/L
b) 30 mg/L
c) 40 mg/L
d) 75 mg/L
e) 25 mg/L - Answers-a) 50 mg/L
A common chemical used for disinfecting a small public
water supply is:
a) soda ash
b) copper sulfate
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c) sodium hypochlorite
d) fluoride
e) sodium chloride - Answers-c) sodium hypochlorite
Gravity filters will remove which of the following from
surface water supplies:
a) turbidity
b) taste and odors
c) nitrates
d) hardness
e) chlorides - Answers-a) turbidity
If you added 3.5 mg/L of chlorine to your storage tank and
30 minutes later measured the residual at 1.2 mg/L, what
was the chlorine demand in the tank?
a) 4.2
b) 2.9
c) 0.3
d) 2.3
e) 4.7 - Answers-d) 2.3
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When fecal coliform organisms are found in a water
supply, it is an indication that:
a) the water supply is contaminated
b) pathogenic organisms might be present
c) the water may be unsuitable for drinking
d) follow-up sampling must take place
e) all of the above - Answers-e) all of the above
Which of the following is an acceptable level of residual
chlorine in the far reaches of a distribution system?
a) 0.2 mg/L of free chlorine for a small GWS
b) 0.5 mg/L of chloramine for a large SWS
c) 1.0 mg/L of combined when using ammoniation facilities
d) 1.0 mg/L of total for a large SWS
e) all of the above - Answers-e) all of the above
The purpose of an air line on a well is to:
a) aerate the well
b) determine the depth of the aquifer
c) inject chlorine into the well
d) allow the well to breathe
TEXAS CLASS D WATER FINAL EXAM 2026 EXAM 2
VERSIONS ACCURATE ACTUAL EXAM ||VERIFIED
QUESTIONS||FREQUENTLY TESTED QUESTIONS
WITH DETAILED ANSWERS | GUARANTEED PASS |
GRADED A+ | NEWEST EXAM!!!
Which of the following is part of a hypochlorination
system?
a) solution feed pump
b) gas cylinder
c) rotameter
d) injector/ejector
e) all of the above - Answers-a) solution feed pump
An elevated storage tank should be protected against
corrosion by:
a) painting
b) cathodic protection
c) water stabilization
d) all of the above
e) galvanizing - Answers-d) all of the above (painting,
cathodic protection, and water stabilization)
,2|Page
The pH of water indicates whether it is acidic or basic and
is expressed by a scale of numbers ranging from:
a) 0 - 7
b) 0 - 14
c) 1 - 7
d) 1 - 14
e) none of the above - Answers-b) 0 - 14
Before a new main is placed into service, it must be
properly disinfected with a minimum chlorine dosage of:
a) 50 mg/L
b) 30 mg/L
c) 40 mg/L
d) 75 mg/L
e) 25 mg/L - Answers-a) 50 mg/L
A common chemical used for disinfecting a small public
water supply is:
a) soda ash
b) copper sulfate
,3|Page
c) sodium hypochlorite
d) fluoride
e) sodium chloride - Answers-c) sodium hypochlorite
Gravity filters will remove which of the following from
surface water supplies:
a) turbidity
b) taste and odors
c) nitrates
d) hardness
e) chlorides - Answers-a) turbidity
If you added 3.5 mg/L of chlorine to your storage tank and
30 minutes later measured the residual at 1.2 mg/L, what
was the chlorine demand in the tank?
a) 4.2
b) 2.9
c) 0.3
d) 2.3
e) 4.7 - Answers-d) 2.3
, 4|Page
When fecal coliform organisms are found in a water
supply, it is an indication that:
a) the water supply is contaminated
b) pathogenic organisms might be present
c) the water may be unsuitable for drinking
d) follow-up sampling must take place
e) all of the above - Answers-e) all of the above
Which of the following is an acceptable level of residual
chlorine in the far reaches of a distribution system?
a) 0.2 mg/L of free chlorine for a small GWS
b) 0.5 mg/L of chloramine for a large SWS
c) 1.0 mg/L of combined when using ammoniation facilities
d) 1.0 mg/L of total for a large SWS
e) all of the above - Answers-e) all of the above
The purpose of an air line on a well is to:
a) aerate the well
b) determine the depth of the aquifer
c) inject chlorine into the well
d) allow the well to breathe
