Water Distribution Operation and Maintenance Exam with
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verified detailed answers || ||
Chlorination is the most common means of disinfection used today to protect the public's
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health - ✔✔True || ||
As water mains and reservoirs become older, they require less maintenance - ✔✔False
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Routine water quality monitoring consists of collecting samples at remote locations in the
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system and testing fro chlorine residual and coliforms. - ✔✔True
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Existing contaminant limits mar be modified is EPA's ongoing research reveals new
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information about the effects of a particular substance - ✔✔True || || || || || || || || ||
Reservoirs that are not heavily used can be a source of taste, odor, and contamination
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problems - ✔✔True || ||
When someone contacts you complaining that their drinking water looks muddy tastes bad,
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or smells bad, you need not be concerned - ✔✔False
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The lack of circulation in a dead end creates nearly ideal conditions for degrading water
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quality - ✔✔True || ||
Groundwaters are more succeptible to contamination that surface waters - ✔✔False || || || || || || || || || ||
A water supply that is satisfactory for one purpose, might be entirely unsatisfactory for
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another - ✔✔True || ||
, Chloramines are considered a more powerful disinfectant than chlorine - ✔✔True
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Under what conditions should water mains be located adjacent to sewer lines? - ✔✔When
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physical conditions or soil conditions prevent minimum separation distances from being
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met
How can corrosion be prevented on the insides of cement or metal pipes - ✔✔Line with
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asphalt or coal tar coatings || || || ||
What influences the knowledge and skills required to work as a water distribution system
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operator in a given system? - ✔✔The size of the water distribution system
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What are organics? - ✔✔Chemical substances that are based on the element carbon
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Why are chloramines more effective against biofilms than chlorine? - ✔✔More persistent
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1.3 Why have drinking water quality standards been prepared and used? - ✔✔To provide
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the needed quality control and ensure the acceptability of the product
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1.5.3 Why is water quality monitoring of distribution systems important? - ✔✔To identify
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when and where water quality changes occur in the system
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1.5.2.1 When water lines are being repaired, how can possible contamination of the water
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line be prevented? - ✔✔Keep the hole dewatered
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What are pathogens? - ✔✔disease causing organisms
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verified detailed answers || ||
Chlorination is the most common means of disinfection used today to protect the public's
|| || || || || || || || || || || || || ||
health - ✔✔True || ||
As water mains and reservoirs become older, they require less maintenance - ✔✔False
|| || || || || || || || || || || ||
Routine water quality monitoring consists of collecting samples at remote locations in the
|| || || || || || || || || || || || ||
system and testing fro chlorine residual and coliforms. - ✔✔True
|| || || || || || || || ||
Existing contaminant limits mar be modified is EPA's ongoing research reveals new
|| || || || || || || || || || || ||
information about the effects of a particular substance - ✔✔True || || || || || || || || ||
Reservoirs that are not heavily used can be a source of taste, odor, and contamination
|| || || || || || || || || || || || || || ||
problems - ✔✔True || ||
When someone contacts you complaining that their drinking water looks muddy tastes bad,
|| || || || || || || || || || || ||
or smells bad, you need not be concerned - ✔✔False
|| || || || || || || || || ||
The lack of circulation in a dead end creates nearly ideal conditions for degrading water
|| || || || || || || || || || || || || || ||
quality - ✔✔True || ||
Groundwaters are more succeptible to contamination that surface waters - ✔✔False || || || || || || || || || ||
A water supply that is satisfactory for one purpose, might be entirely unsatisfactory for
|| || || || || || || || || || || || || ||
another - ✔✔True || ||
, Chloramines are considered a more powerful disinfectant than chlorine - ✔✔True
|| || || || || || || || || ||
Under what conditions should water mains be located adjacent to sewer lines? - ✔✔When
|| || || || || || || || || || || || || ||
physical conditions or soil conditions prevent minimum separation distances from being
|| || || || || || || || || || ||
met
How can corrosion be prevented on the insides of cement or metal pipes - ✔✔Line with
|| || || || || || || || || || || || || || || ||
asphalt or coal tar coatings || || || ||
What influences the knowledge and skills required to work as a water distribution system
|| || || || || || || || || || || || || ||
operator in a given system? - ✔✔The size of the water distribution system
|| || || || || || || || || || || ||
What are organics? - ✔✔Chemical substances that are based on the element carbon
|| || || || || || || || || || || ||
Why are chloramines more effective against biofilms than chlorine? - ✔✔More persistent
|| || || || || || || || || || ||
1.3 Why have drinking water quality standards been prepared and used? - ✔✔To provide
|| || || || || || || || || || || || || ||
the needed quality control and ensure the acceptability of the product
|| || || || || || || || || ||
1.5.3 Why is water quality monitoring of distribution systems important? - ✔✔To identify
|| || || || || || || || || || || || ||
when and where water quality changes occur in the system
|| || || || || || || || ||
1.5.2.1 When water lines are being repaired, how can possible contamination of the water
|| || || || || || || || || || || || || ||
line be prevented? - ✔✔Keep the hole dewatered
|| || || || || || ||
What are pathogens? - ✔✔disease causing organisms
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