D2 water distribution test questions with 100%
Correct Solutions
What is the primary purpose of the SDWA? - ANSWER To create uniform national
standards for drinking water quality
Who sets Maximum Contaminants Levels (MCLs)? - ANSWER USEPA
What are some of the duties of the EPA? - ANSWER Sets MCLs, delegates enforcement
of SDWA to state agencies, provides grant funds, monitors state activities, provides
continued research
What is state primacy? - ANSWER Giving the authority to the state to implement and
enforce regulations
True or False: State requirements must be at least as stringent as those set by USEPA -
ANSWER True.
A public water system is a system that supplies piped water for human consumption and
that has at least ___ service connections or serves ___ or more persons for ___ or more
days of the year. - ANSWER 15, 25, 60
What is an nontransient, noncommunity public water system? Give an example of one. -
ANSWER Establishments with their own private water systems that serve an average of
25 persons that do not live at the location, but the same people use the water for more
than 6 months per year. Example: school or factory
What is a transient, noncommunity public water system? Give an example of one. -
ANSWER Establishments with own water system and serve at least 25 persons a day but
,these people only use the water occasionally and for short periods of time. Example:
Motel or Park
What is a community public water system? Give an example of one. - ANSWER
Establishments with their own water supply that serve more than 15 homes. Example:
HOA, or municipal water utilities
Which of the public water systems are required to only monitor for nitrate, nitrite, and
microbiological contamination? - ANSWER transient, noncommunity
What does the National Primary Drinking Water Regulations (NPDWRs) specify? -
ANSWER MCLs or a treatment technique requirement for contaminants that may be
found in drinking water and could have an adverse health effect on humans
What does the National Secondary Drinking Water Regulations (NPDWRs) specify? -
ANSWER water contaminants that may adversely affect aesthetic qualities of the water
such as taste, odor or color
When must an agency post a public notification? - ANSWER When the water system
violates any of the operating, monitoring or reporting requirements or if they exceed
the MCL
Lead and Copper Rule (LCR) - ANSWER Requires that samples be collected at customers
taps after the water has remained undisturbed in the water piping for at least 6 hrs
True or False: system operators are required to regularly collect and test water samples.
- ANSWER true
True or False: Water quality cannot change after it enter the distribution system. -
ANSWER false -blending, season, operational changes
, What are the 4 methods of collecting samples? - ANSWER Grab sample, composite
sample, time composite sample, flow-proportional composite sample
What is a grab sample? - ANSWER A single sample at a single location
What is a composite sample? - ANSWER A series of grab samples at one place and at
different times
What is a time composite sample? - ANSWER Equal volumes at regular intervals
What is a flow proportional composite sample? - ANSWER Adjusting the sample size
proportional to the flow
How do you select a sample point? - ANSWER As close to the main as possible
True or false: It is required for samples to be taken from groundwater under the direct
influence of surface water. - ANSWER true
What are Sanitary Surveys? - ANSWER On site annual inspection of a water system's
facilities and operation.
What are some the requirements that the State establishes to ensure proper water
system operation? - ANSWER Operator Certification, sanitary surveys, enforcement
What are the 3 main areas of concern to distribution operators? - ANSWER
microbiological safety, disinfection by products, lead
Correct Solutions
What is the primary purpose of the SDWA? - ANSWER To create uniform national
standards for drinking water quality
Who sets Maximum Contaminants Levels (MCLs)? - ANSWER USEPA
What are some of the duties of the EPA? - ANSWER Sets MCLs, delegates enforcement
of SDWA to state agencies, provides grant funds, monitors state activities, provides
continued research
What is state primacy? - ANSWER Giving the authority to the state to implement and
enforce regulations
True or False: State requirements must be at least as stringent as those set by USEPA -
ANSWER True.
A public water system is a system that supplies piped water for human consumption and
that has at least ___ service connections or serves ___ or more persons for ___ or more
days of the year. - ANSWER 15, 25, 60
What is an nontransient, noncommunity public water system? Give an example of one. -
ANSWER Establishments with their own private water systems that serve an average of
25 persons that do not live at the location, but the same people use the water for more
than 6 months per year. Example: school or factory
What is a transient, noncommunity public water system? Give an example of one. -
ANSWER Establishments with own water system and serve at least 25 persons a day but
,these people only use the water occasionally and for short periods of time. Example:
Motel or Park
What is a community public water system? Give an example of one. - ANSWER
Establishments with their own water supply that serve more than 15 homes. Example:
HOA, or municipal water utilities
Which of the public water systems are required to only monitor for nitrate, nitrite, and
microbiological contamination? - ANSWER transient, noncommunity
What does the National Primary Drinking Water Regulations (NPDWRs) specify? -
ANSWER MCLs or a treatment technique requirement for contaminants that may be
found in drinking water and could have an adverse health effect on humans
What does the National Secondary Drinking Water Regulations (NPDWRs) specify? -
ANSWER water contaminants that may adversely affect aesthetic qualities of the water
such as taste, odor or color
When must an agency post a public notification? - ANSWER When the water system
violates any of the operating, monitoring or reporting requirements or if they exceed
the MCL
Lead and Copper Rule (LCR) - ANSWER Requires that samples be collected at customers
taps after the water has remained undisturbed in the water piping for at least 6 hrs
True or False: system operators are required to regularly collect and test water samples.
- ANSWER true
True or False: Water quality cannot change after it enter the distribution system. -
ANSWER false -blending, season, operational changes
, What are the 4 methods of collecting samples? - ANSWER Grab sample, composite
sample, time composite sample, flow-proportional composite sample
What is a grab sample? - ANSWER A single sample at a single location
What is a composite sample? - ANSWER A series of grab samples at one place and at
different times
What is a time composite sample? - ANSWER Equal volumes at regular intervals
What is a flow proportional composite sample? - ANSWER Adjusting the sample size
proportional to the flow
How do you select a sample point? - ANSWER As close to the main as possible
True or false: It is required for samples to be taken from groundwater under the direct
influence of surface water. - ANSWER true
What are Sanitary Surveys? - ANSWER On site annual inspection of a water system's
facilities and operation.
What are some the requirements that the State establishes to ensure proper water
system operation? - ANSWER Operator Certification, sanitary surveys, enforcement
What are the 3 main areas of concern to distribution operators? - ANSWER
microbiological safety, disinfection by products, lead
