©THESTAR 2024/2025 ALL RIGHTS RESERVED 12:43 PM.
Texas Class D Water Distribution study
guide Questions With Correct Answers 100%
Verified.
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?
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
1
, ©THESTAR 2024/2025 ALL RIGHTS RESERVED 12:43 PM.
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
According to state requirements all public water supply wells shall be provided with a raised
concrete sealing block screen vents and - Answer✔Flow Measuring Device
One method to determine the drawdown of a water well is - Answer✔An air line
The pH of the water indicates - Answer✔If it is more acid or base
Assuming you collect more than 1 bac-t sample monthly and your system receives notification
from the lab that one of the samples taken in the distribution system comes back positive your
repeat sample(s) must be taken within _____ hours and a total of _____ repeat samples must
be collected for each positive? - Answer✔24 hours and 3 repeat samples
Water that is considered neutral is expressed on the pH scale at - Answer✔7
Which of the following is a required step in collecting a routine distribution sample for
bacteriological testing? - Answer✔Use an approved, sterile sample container
Potable water means that the water is
A. Maintained at adequate pressure
B. Pathogen free
C. Contains a chlorine residual
D. All of the above
E. B & C only - Answer✔All of the above
Before a new or repaired water line is placed into service, it must be properly disinfected by
providing a chlorine dosage of __________________ and proper detention time - Answer✔50
mg/L
Should a public water supply systems distribution system drop below 20 psi, what is required of
the operator?
A. Nothing 20 psi is simply a goal
B. Immediately correct the problem or cause of low pressure
2
Texas Class D Water Distribution study
guide Questions With Correct Answers 100%
Verified.
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?
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
1
, ©THESTAR 2024/2025 ALL RIGHTS RESERVED 12:43 PM.
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
According to state requirements all public water supply wells shall be provided with a raised
concrete sealing block screen vents and - Answer✔Flow Measuring Device
One method to determine the drawdown of a water well is - Answer✔An air line
The pH of the water indicates - Answer✔If it is more acid or base
Assuming you collect more than 1 bac-t sample monthly and your system receives notification
from the lab that one of the samples taken in the distribution system comes back positive your
repeat sample(s) must be taken within _____ hours and a total of _____ repeat samples must
be collected for each positive? - Answer✔24 hours and 3 repeat samples
Water that is considered neutral is expressed on the pH scale at - Answer✔7
Which of the following is a required step in collecting a routine distribution sample for
bacteriological testing? - Answer✔Use an approved, sterile sample container
Potable water means that the water is
A. Maintained at adequate pressure
B. Pathogen free
C. Contains a chlorine residual
D. All of the above
E. B & C only - Answer✔All of the above
Before a new or repaired water line is placed into service, it must be properly disinfected by
providing a chlorine dosage of __________________ and proper detention time - Answer✔50
mg/L
Should a public water supply systems distribution system drop below 20 psi, what is required of
the operator?
A. Nothing 20 psi is simply a goal
B. Immediately correct the problem or cause of low pressure
2
