Water operator “D”water CORRECT
QUESTIONS AND ANSWERS 2024-2025
What is the name of the State Agency responsible for enforcing the Safe Drinking Water Program in
Texas? ANSWER-Texas Commission on Environmental Quality (formally known as TNRCC)
What minerals are associated with water hardness? ANSWER-calcium and magnesium
A public water system MUST at all times provide - ANSWER-Adequate quantity of water
Adequate water pressure
Adequate Disinfection
All of the Above
A source of Groundwater would be - ANSWER-Aquifer
Fecal cooliform organisms sometimes found in water supplies are an indication ANSWER-The Water
supply is contaminated
Harmful bacteria may be present
Possible pathogenic organisms are in the water
The water is unsuitable for drinking
, All the above
A disease that May be spread by inadequately disinfected water is - ANSWER-dysentery
One method to determine the drawdown of a water well is - ANSWER-An air line
The pH of water indicates - ANSWER-If it is more acid or base
Assuming you collect more than one bacteriological 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 (excluding weekends) and a total of_______________________repeat
samples must be collected for each positive? ANSWER-24 hours & 3 repeat samples for each positive
Water that is considered neutral is expressed on the pH scale at - ANSWER-7.0
Which of the following is a required step in collecting a routine distribution sample for bacteriological
testing? ANSWER-Use of an approved, sterile sample container
Potable water means the water is - ANSWER-Maintained at adequate pressure
Pathogen free
Contains a chlorine residual
All the above
Which of the following is an acceptable disinfection residual at the far reaches of the distribution system
- ANSWER-0.2 mg/L free chlorine residual
0.5 mg/L chloramine residual for a surface water supply.
0.8 mg/L chloramine residual when using chloramine treatment
QUESTIONS AND ANSWERS 2024-2025
What is the name of the State Agency responsible for enforcing the Safe Drinking Water Program in
Texas? ANSWER-Texas Commission on Environmental Quality (formally known as TNRCC)
What minerals are associated with water hardness? ANSWER-calcium and magnesium
A public water system MUST at all times provide - ANSWER-Adequate quantity of water
Adequate water pressure
Adequate Disinfection
All of the Above
A source of Groundwater would be - ANSWER-Aquifer
Fecal cooliform organisms sometimes found in water supplies are an indication ANSWER-The Water
supply is contaminated
Harmful bacteria may be present
Possible pathogenic organisms are in the water
The water is unsuitable for drinking
, All the above
A disease that May be spread by inadequately disinfected water is - ANSWER-dysentery
One method to determine the drawdown of a water well is - ANSWER-An air line
The pH of water indicates - ANSWER-If it is more acid or base
Assuming you collect more than one bacteriological 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 (excluding weekends) and a total of_______________________repeat
samples must be collected for each positive? ANSWER-24 hours & 3 repeat samples for each positive
Water that is considered neutral is expressed on the pH scale at - ANSWER-7.0
Which of the following is a required step in collecting a routine distribution sample for bacteriological
testing? ANSWER-Use of an approved, sterile sample container
Potable water means the water is - ANSWER-Maintained at adequate pressure
Pathogen free
Contains a chlorine residual
All the above
Which of the following is an acceptable disinfection residual at the far reaches of the distribution system
- ANSWER-0.2 mg/L free chlorine residual
0.5 mg/L chloramine residual for a surface water supply.
0.8 mg/L chloramine residual when using chloramine treatment
