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

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What istheprimary purposeoftheSDWA? -RCORRECTANSWER - To
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create uniform national standards for drinking water quality
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WhosetsMaximumContaminantsLevels(MCLs)?-RCORRECTANSWER-USEPA
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What are someofthe dutiesof theEPA? -CORRECT ANSWER-
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SetsMCLs,delegatesenforcementofSDWAtostateagencies,providesgrantfunds,monitorsstateactivi ties,
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provides continued research
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Whatisstateprimacy? -RCORRECT ANSWER-
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Givingtheauthority to thestateto implement andenforce regulations
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True orFalse: Staterequirements must beat leastas stringentas thosesetbyUSEPA - CORRECT
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ANSWER -True.
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A public water system is a systemthat supplies pipedwater forhuman 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. - i i i i i i i i i i i i i i




CORRECTANSWER -15,25, 60 i i i i




What is annontransient, noncommunity publicwatersystem? Giveanexampleofone. - CORRECT
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ANSWER -
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Establishments with their own private water systems that serve an average of 25 persons that do not liv e at the i i i i i i i i i i i i i i i i i i i i




location, but the same people use the water for more than6 months per year. Example: school or 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 water
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occasionally and for short periods of time. Example: Motel or Park
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What is acommunity public water system?Give anexample ofone.- CORRECT ANSWER-
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Establishments with their own water supply that serve more than 15 homes. Example: HOA, or municip al i i i i i i i i i i i i i i i i




water utilities
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, Which ofthepublic watersystems arerequiredtoonly monitor for nitrate, nitrite, andmicrobiologicalc
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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 - MCLsora
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treatment technique requirementforcontaminants thatmay be foundin drinkingwater and could have an
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adverse health effect on humans
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What does the National Secondary Drinking Water Regulations (NPDWRs) specify? - CORRECT ANSWER - water
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contaminantsRthatmayadverselyaffectaesthetic qualitiesofthewatersuchas taste,odororcolo r
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Whenmust anagencypostapublic notification? - CORRECT ANSWER-
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When the water system violates any of the operating, monitoring or reporting requirements or if they e xceed
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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 ater
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piping for at least 6 hrs
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TrueorFalse:systemoperatorsarerequiredtoregularlycollectandtestwatersamples.- CORRECT
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ANSWER -true
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True orFalse:Waterquality cannotchangeafterit enterthe distributionsystem.-CORRECT ANSWER- false -
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blending, season, operational changes i i i




What are the4methodsofcollecting samples? - CORRECT ANSWER-
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Grabsample,compositesample,timecompositesample,flow-proportionalcompositesample
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What is a grab sample? - CORRECT ANSWER -A singlesample at a single location
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What is acomposite sample? -CORRECT ANSWER-
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A seriesofgrabsamples at oneplace and at different times
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