D2 WATER DISTRIBUTION TEST QUESTIONS
WITH CORRECT ANSWERS 2025
What is the primary purpose of the SDWA? -RCORRECT ANSWER -
To create uniform national standards for drinking water quality
Who sets Maximum Contaminants Levels (MCLs)? -RCORRECT ANSWER -USEPA
What are some of the duties of the EPA? - CORRECT ANSWER -
Sets MCLs, delegates enforcement of SDWA to state agencies, provides grant funds, monitors state activi
ties, provides continued research
What is state primacy? -RCORRECT 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 -
CORRECT ANSWER -True.
A public water system is a system that supplies piped water for human consumption and that has at leas
t service connections or serves or more persons for or more days of the year. -
CORRECT ANSWER -15, 25, 60
What is an nontransient, noncommunity public water system? Give an example of one. -
CORRECT ANSWER -
Establishments with their own private water systems that serve an average of 25 persons that do not liv
e 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. - CORRECT ANSWER -
Establishments with own water system and serve at least 25 persons a day but these people only use th
e water occasionally and for short periods of time. Example: Motel or Park
What is a community public water system? Give an example of one. - CORRECT ANSWER -
Establishments with their own water supply that serve more than 15 homes. Example: HOA, or municip
al water utilities
, Which of the public water systems are required to only monitor for nitrate, nitrite, and microbiological c
ontamination? - CORRECT ANSWER -transient, noncommunity
What does the National Primary Drinking Water Regulations (NPDWRs) specify? - CORRECT 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? - CORRECT ANSWER -
water contaminantsRthat may adversely affect aesthetic qualities of the water such as taste, odor or colo
r
When must an agency post a public notification? - CORRECT ANSWER -
When the water system violates any of the operating, monitoring or reporting requirements or if they e
xceed the MCL
Lead and Copper Rule (LCR) - CORRECT ANSWER -
Requires that samples be collected at customers taps after the water has remained undisturbed in the w
ater piping for at least 6 hrs
True or False: system operators are required to regularly collect and test water samples. -
CORRECT ANSWER -true
True or False: Water quality cannot change after it enter the distribution system. - CORRECT ANSWER -
false -blending, season, operational changes
What are the 4 methods of collecting samples? - CORRECT ANSWER -
Grab sample, composite sample, time composite sample, flow-proportional composite sample
What is a grab sample? - CORRECT ANSWER -A single sample at a single location
What is a composite sample? - CORRECT ANSWER -
A series of grab samples at one place and at different times
WITH CORRECT ANSWERS 2025
What is the primary purpose of the SDWA? -RCORRECT ANSWER -
To create uniform national standards for drinking water quality
Who sets Maximum Contaminants Levels (MCLs)? -RCORRECT ANSWER -USEPA
What are some of the duties of the EPA? - CORRECT ANSWER -
Sets MCLs, delegates enforcement of SDWA to state agencies, provides grant funds, monitors state activi
ties, provides continued research
What is state primacy? -RCORRECT 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 -
CORRECT ANSWER -True.
A public water system is a system that supplies piped water for human consumption and that has at leas
t service connections or serves or more persons for or more days of the year. -
CORRECT ANSWER -15, 25, 60
What is an nontransient, noncommunity public water system? Give an example of one. -
CORRECT ANSWER -
Establishments with their own private water systems that serve an average of 25 persons that do not liv
e 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. - CORRECT ANSWER -
Establishments with own water system and serve at least 25 persons a day but these people only use th
e water occasionally and for short periods of time. Example: Motel or Park
What is a community public water system? Give an example of one. - CORRECT ANSWER -
Establishments with their own water supply that serve more than 15 homes. Example: HOA, or municip
al water utilities
, Which of the public water systems are required to only monitor for nitrate, nitrite, and microbiological c
ontamination? - CORRECT ANSWER -transient, noncommunity
What does the National Primary Drinking Water Regulations (NPDWRs) specify? - CORRECT 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? - CORRECT ANSWER -
water contaminantsRthat may adversely affect aesthetic qualities of the water such as taste, odor or colo
r
When must an agency post a public notification? - CORRECT ANSWER -
When the water system violates any of the operating, monitoring or reporting requirements or if they e
xceed the MCL
Lead and Copper Rule (LCR) - CORRECT ANSWER -
Requires that samples be collected at customers taps after the water has remained undisturbed in the w
ater piping for at least 6 hrs
True or False: system operators are required to regularly collect and test water samples. -
CORRECT ANSWER -true
True or False: Water quality cannot change after it enter the distribution system. - CORRECT ANSWER -
false -blending, season, operational changes
What are the 4 methods of collecting samples? - CORRECT ANSWER -
Grab sample, composite sample, time composite sample, flow-proportional composite sample
What is a grab sample? - CORRECT ANSWER -A single sample at a single location
What is a composite sample? - CORRECT ANSWER -
A series of grab samples at one place and at different times
