Texas Class D Water Distribution study
guide Questions & Answers
What is the name of the State Agency responsible for enforcing the Safe Drinking Water
Act? - ANSWERSTexas Commission on Environmental Quality
what Minerals are associated with water hardness? - ANSWERSCalcium 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 - ANSWERSD. All of the above
A Source of groundwater would be? - ANSWERSAquifer
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 - ANSWERSE. All of the above
A disease that may be spread by inadequately disinfected water is -
ANSWERSDysentery
A Common Chemical used in the disinfection of a small water Supply is -
ANSWERSCalcium hypochlorite
A public water Supply system should maintain a system residual pressure of 20 psi and
a minimum normal operating pressure of _____ - ANSWERS35 psi
, The amount of chlorine in mg/L that is used by reacting with iron, organics or bacteria is
called - ANSWERSDemand
The MOST important treatment in water is - ANSWERSDisinfection
Which of the following would be considered part(s) of a hypo-chlorinator system -
ANSWERSSolution feed pump
According to state requirements all public water supply wells shall be provided with a
raised concrete sealing block screen vents and - ANSWERSFlow Measuring Device
One method to determine the drawdown of a water well is - ANSWERSAn air line
The pH of the water indicates - ANSWERSIf 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? - ANSWERS24 hours and 3
repeat samples
Water that is considered neutral is expressed on the pH scale at - ANSWERS7
Which of the following is a required step in collecting a routine distribution sample for
bacteriological testing? - ANSWERSUse 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 - ANSWERSAll 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 -
ANSWERS50 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
C. Notify the mayor and city council
D. Notify the Regional TCEQ office and issue a "Boil Water Notice"
E. Both B and D - ANSWERSBoth B and D
guide Questions & Answers
What is the name of the State Agency responsible for enforcing the Safe Drinking Water
Act? - ANSWERSTexas Commission on Environmental Quality
what Minerals are associated with water hardness? - ANSWERSCalcium 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 - ANSWERSD. All of the above
A Source of groundwater would be? - ANSWERSAquifer
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 - ANSWERSE. All of the above
A disease that may be spread by inadequately disinfected water is -
ANSWERSDysentery
A Common Chemical used in the disinfection of a small water Supply is -
ANSWERSCalcium hypochlorite
A public water Supply system should maintain a system residual pressure of 20 psi and
a minimum normal operating pressure of _____ - ANSWERS35 psi
, The amount of chlorine in mg/L that is used by reacting with iron, organics or bacteria is
called - ANSWERSDemand
The MOST important treatment in water is - ANSWERSDisinfection
Which of the following would be considered part(s) of a hypo-chlorinator system -
ANSWERSSolution feed pump
According to state requirements all public water supply wells shall be provided with a
raised concrete sealing block screen vents and - ANSWERSFlow Measuring Device
One method to determine the drawdown of a water well is - ANSWERSAn air line
The pH of the water indicates - ANSWERSIf 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? - ANSWERS24 hours and 3
repeat samples
Water that is considered neutral is expressed on the pH scale at - ANSWERS7
Which of the following is a required step in collecting a routine distribution sample for
bacteriological testing? - ANSWERSUse 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 - ANSWERSAll 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 -
ANSWERS50 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
C. Notify the mayor and city council
D. Notify the Regional TCEQ office and issue a "Boil Water Notice"
E. Both B and D - ANSWERSBoth B and D
