Texas Class D Water Distribution study
guide Exam 2026 Questions and Answers
What is the name of the State Agency responsible for enforcing the Safe Drinking
Water Act? - Answer -Texas Commission on Environmental Quality
what Minerals are associated with water hardness? - Answer -Calcium and
magnesium
A public water system MUST at all times provide?
A. Adequate quantity of water
B. Adequate water pressure
c. Adequate disinfection
D. All of the above - Answer -D. All of the above
A Source of groundwater would be? - Answer -Aquifer
Fecal Coliform organisms sometimes found in water supplies are an indication
that?
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, A. The water Supply is Contaminated
B. Harmful Bacteria may be present
C. Possible pathogenic organisms are in the water
D. The water is unsuitable for drinking
E. All of the above - Answer -E. All of the above
A disease that may be spread by inadequately disinfected water is - Answer -
Dysentery
A Common Chemical used in the disinfection of a small water Supply is - Answer -
Calcium hypochlorite
A public water Supply system should maintain a system residual pressure of 20 psi
and a minimum normal operating pressure of _____ - Answer -35 psi
The amount of chlorine in mg/L that is used by reacting with iron, organics or
bacteria is called - Answer -Demand
The MOST important treatment in water is - Answer -Disinfection
Which of the following would be considered part(s) of a hypo-chlorinator system -
Answer -Solution feed pump
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guide Exam 2026 Questions and Answers
What is the name of the State Agency responsible for enforcing the Safe Drinking
Water Act? - Answer -Texas Commission on Environmental Quality
what Minerals are associated with water hardness? - Answer -Calcium and
magnesium
A public water system MUST at all times provide?
A. Adequate quantity of water
B. Adequate water pressure
c. Adequate disinfection
D. All of the above - Answer -D. All of the above
A Source of groundwater would be? - Answer -Aquifer
Fecal Coliform organisms sometimes found in water supplies are an indication
that?
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, A. The water Supply is Contaminated
B. Harmful Bacteria may be present
C. Possible pathogenic organisms are in the water
D. The water is unsuitable for drinking
E. All of the above - Answer -E. All of the above
A disease that may be spread by inadequately disinfected water is - Answer -
Dysentery
A Common Chemical used in the disinfection of a small water Supply is - Answer -
Calcium hypochlorite
A public water Supply system should maintain a system residual pressure of 20 psi
and a minimum normal operating pressure of _____ - Answer -35 psi
The amount of chlorine in mg/L that is used by reacting with iron, organics or
bacteria is called - Answer -Demand
The MOST important treatment in water is - Answer -Disinfection
Which of the following would be considered part(s) of a hypo-chlorinator system -
Answer -Solution feed pump
©COPYRIGHT 2025, ALL RIGHTS RESERVED 2
