Texas Class D Water Distribution study
guide
A physical connection between a potable water supply and a house well would be -
Correct Answer-A cross connection
Excessive nitrates in drinking water can cause a condition that affects infants under the
age of 6 months the condition is called - Correct Answer-Blue Baby
A public water system is required to take samples of water for bacteriological analysis.
The organism that is used as an indicator is called - Correct Answer-Coliform
Chlorine dosage is demand plus desired _______________ - Correct Answer-Residual
What is the name of the State Agency responsible for enforcing the Safe Drinking Water
Act? - Correct Answer-Texas Commission on Environmental Quality
what Minerals are associated with water hardness? - Correct 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 - Correct Answer-D. All of the above
A Source of groundwater would be? - Correct Answer-Aquifer
The amount of chlorine in mg/L that is used by reacting with iron, organics or bacteria is
called - Correct Answer-Demand
The MOST important treatment in water is - Correct Answer-Disinfection
Which of the following would be considered part(s) of a hypo-chlorinator system -
Correct 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 - Correct Answer-Flow Measuring
Device
One method to determine the drawdown of a water well is - Correct Answer-An air line
The pH of the water indicates - Correct 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? - Correct Answer-24 hours
and 3 repeat samples
Water that is considered neutral is expressed on the pH scale at - Correct Answer-7
Which of the following is a required step in collecting a routine distribution sample for
bacteriological testing? - Correct 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 - Correct 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 -
Correct Answer-50 mg/L
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 - Correct Answer-E. All of the above
A disease that may be spread by inadequately disinfected water is - Correct Answer-
Dysentery
A Common Chemical used in the disinfection of a small water Supply is - Correct
Answer-Calcium hypochlorite
A public water Supply system should maintain a system residual pressure of 20 psi and
a minimum normal operating pressure of _____ - Correct Answer-35 psi
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
guide
A physical connection between a potable water supply and a house well would be -
Correct Answer-A cross connection
Excessive nitrates in drinking water can cause a condition that affects infants under the
age of 6 months the condition is called - Correct Answer-Blue Baby
A public water system is required to take samples of water for bacteriological analysis.
The organism that is used as an indicator is called - Correct Answer-Coliform
Chlorine dosage is demand plus desired _______________ - Correct Answer-Residual
What is the name of the State Agency responsible for enforcing the Safe Drinking Water
Act? - Correct Answer-Texas Commission on Environmental Quality
what Minerals are associated with water hardness? - Correct 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 - Correct Answer-D. All of the above
A Source of groundwater would be? - Correct Answer-Aquifer
The amount of chlorine in mg/L that is used by reacting with iron, organics or bacteria is
called - Correct Answer-Demand
The MOST important treatment in water is - Correct Answer-Disinfection
Which of the following would be considered part(s) of a hypo-chlorinator system -
Correct 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 - Correct Answer-Flow Measuring
Device
One method to determine the drawdown of a water well is - Correct Answer-An air line
The pH of the water indicates - Correct 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? - Correct Answer-24 hours
and 3 repeat samples
Water that is considered neutral is expressed on the pH scale at - Correct Answer-7
Which of the following is a required step in collecting a routine distribution sample for
bacteriological testing? - Correct 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 - Correct 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 -
Correct Answer-50 mg/L
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 - Correct Answer-E. All of the above
A disease that may be spread by inadequately disinfected water is - Correct Answer-
Dysentery
A Common Chemical used in the disinfection of a small water Supply is - Correct
Answer-Calcium hypochlorite
A public water Supply system should maintain a system residual pressure of 20 psi and
a minimum normal operating pressure of _____ - Correct Answer-35 psi
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
