D2 water distribution test
with questions and well
verified answers actual
exam!!! 2026
What is the primary purpose of the SWDA? - 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
with questions and well
verified answers actual
exam!!! 2026
What is the primary purpose of the SWDA? - 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
