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Texas Class D Water Distribution study guide Questions
with Answers (100% Correct 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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, 2
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
© 2025 All rights reserved
Texas Class D Water Distribution study guide Questions
with Answers (100% Correct 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?
© 2025 All rights reserved
, 2
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
© 2025 All rights reserved
