2025 D2 WATER DISTRIBUTION TEST QUESTIONS WITH CORRECT ANSWERS 2025/2026

D2WATERDISTRIBUTIONTEST QUESTIONS WITH v v v v v




CORRECT ANSWERS 2025 v v v



What is the primary purpose of the SDWA? -RCORRECT ANSWER - To
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create uniform national standards for drinking water quality
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Who sets Maximum Contaminants Levels (MCLs)? -RCORRECT ANSWER -USEPA
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What are some of the duties of the EPA? - CORRECT ANSWER -
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Sets MCLs, delegates enforcement of SDWA to state agencies, provides grant funds, monitors state activi
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ties, provides continued research
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What is state primacy? -RCORRECT ANSWER -
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Giving the authority to the state to implement and enforce regulations
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True or False: State requirements must be at least as stringent as those set by USEPA -
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CORRECT ANSWER -True.
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A public water system is a system that supplies piped water for human consumption and that has at leas t
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service connections or serves or more persons for or more days of the year. -
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CORRECT ANSWER -15, 25, 60 v v v v




What is an nontransient, noncommunity public water system? Give an example of one. -
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CORRECT ANSWER -
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Establishments with their own private water systems that serve an average of 25 persons that do not liv e
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at the location, but the same people use the water for more than 6 months per year. Example: school or
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factory
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What is a transient, noncommunity public water system? Give an example of one. - CORRECT ANSWER -
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Establishments with own water system and serve at least 25 persons a day but these people only use th e
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water occasionally and for short periods of time. Example: Motel or Park
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What is a community public water system? Give an example of one. - CORRECT ANSWER -
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Establishments with their own water supply that serve more than 15 homes. Example: HOA, or municip
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al water utilities
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, Which of the public water systems are required to only monitor for nitrate, nitrite, and microbiological c
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ontamination? - CORRECT ANSWER -transient, noncommunity
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What does the National Primary Drinking Water Regulations (NPDWRs) specify? - CORRECT ANSWER -
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MCLs or a treatment technique requirement for contaminants that may be found in drinking water and
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could have an adverse health effect on humans
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What does the National Secondary Drinking Water Regulations (NPDWRs) specify? - CORRECT ANSWER -
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water contaminantsRthat may adversely affect aesthetic qualities of the water such as taste, odor or colo r
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When must an agency post a public notification? - CORRECT ANSWER -
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When the water system violates any of the operating, monitoring or reporting requirements or if they e
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xceed the MCL
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Lead and Copper Rule (LCR) - CORRECT ANSWER -
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Requires that samples be collected at customers taps after the water has remained undisturbed in the w
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ater piping for at least 6 hrs
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True or False: system operators are required to regularly collect and test water samples. -
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CORRECT ANSWER -true
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True or False: Water quality cannot change after it enter the distribution system. - CORRECT ANSWER -
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false -blending, season, operational changes
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What are the 4 methods of collecting samples? - CORRECT ANSWER -
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Grab sample, composite sample, time composite sample, flow-proportional composite sample
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What is a grab sample? - CORRECT ANSWER -A single sample at a single location
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What is a composite sample? - CORRECT ANSWER -
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A series of grab samples at one place and at different times
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