WATER DISTRIBUTION PRACTICE TEST
D1 /D2 QUESTIONS WITH CORRECT
ANSWERS 2025
TheRonlyRabsolutelyRreliableRmethodRofRbackflowRpreventionRisRtheRuseRofR-RCORRECTRANSWERR-AirRGap
TheRbubblesRformedRinRaRpositiveRmultipleRtubeRfermentationRtestRareR-RCORRECTRANSWERR-
CarbonRDioxide
TheRmaximumRrateRofRwithdrawalRofRgasRfromRaR150lbRchlorineRcylinderRinR24-hoursRisR-
RCORRECTRANSWERR-40Rlbs
IfRyouRencounterRaRliquidRchlorineRleakRinRaRoneRtoneRcontainer,RwhatRactionRshouldRyouRtakeRfirst,RtoRredu
ceRtheRseverityRofRtheRleak?R-RCORRECTRANSWERR-RotateRtheRcontainerRtoRplaceRtheRleakRatRtheRtop
TheRmostRcommonlyRusedRwaterRdisinfectantRinRtheRUnitedRStatesRisR-RCORRECTRANSWERR-Chlorine
WhenRcollectingRaRdistributionRsystemRsample,RtheRwaterRshouldRbeRallowedRtoRrunRforRaRperiodRofRtimeRp
riorRtoRsampleRcollection.RHowRlongR-RCORRECTRANSWERR-
AsRlongRasRnecessaryRtoRpermitRcleaningRofRserviceRline
SampleRbottlesRwichRareRfurnishedRbyRaRcertifiedRlaboratoryRforRcollectionRofRbacteriologicalRsamplesR-
RCORRECTRANSWERR-AreRreadyRtoRuse
TheRdifferenceRbetweenRwaterRpressureRupstreamRandRdownstreamRofRaRpumpRwhenRitRisRnotRinRoperatio
nsRisRknowRasRtheR-RCORRECTRANSWERR-TotalRstaticRhead
ARdeviceRthatRautomaticallyRshutsRoffRflowRinRanRelevatedRstorageRtankRwhenRtheRwaterRlevelRinRtheRtankRr
eacheRaRpresetRlevelRisRtermedRaR-RCORRECTRANSWERR-AltitudeRvalve
InRanRoccupiedRtrenchRrequiringRpersonalRegressRwhatRisRtheRmaximumRallowableRdistanceRbetweenRaRwo
rkerRandRanRexitRletterR-RCORRECTRANSWERR-25Rfeet
, ARwaterRbearingRformationRinRtheRsoilRisRreferredRtoRasR-RCORRECTRANSWERR-AnRaquifer
TheRdistanceRbetweenRtheRstaticRwaterRlevelRandRtheRpumpingRwaterRlevelRisRtermedRtheR-
RCORRECTRANSWERR-Drawdown
ToRpreventRtheRentryRofRsurfaceRcontaminationRintoRaRwellRisRtheRpurposeRofR-RCORRECTRANSWERR-
SanitaryRseal
TheRpresenceRofRcoliformRbacteriaRinRaRdistributionRsystemR-RCORRECTRANSWERR-
IndicatesRthatRpathogenicRorganismsRmayRbeRpresentRalso
TheRmostRcommonRvalveRtypeRinRwaterRdistributionRsystemRisRtheR-RCORRECTRANSWERR-GateRvalve
ARVenturiRisRaRdeviceRusedRtoR-RCORRECTRANSWERR-MeasureRwaterRflow
BackspinRisRoccurringRafterRwellRshutRdownRthisRindicatesR-RCORRECTRANSWERR-ARfaultyRcheckRvalve
ARphRreadingRofR6.0RunitsRindicatesRtheRwaterRsampleRisR-RCORRECTRANSWERR-SlightlyRacidic
ChlorineRgasR-RCORRECTRANSWERR-IsRheavierRthanRair
TheRchangeRinRwhat'reRdemandRduringRtheRcourseRofRaRdayRisRcalledR-RCORRECTRANSWERR-
DiurnalRvariation
CatholicRprotectionRisRaRsystemRusedRforR-RCORRECTRANSWERR-MetallicRcorrosionRinhibition
TheRelevationRofRtheRfreeRsurfaceRinRaRwaterRtableRwellRwichRisRnotRrunningRisRcalledR-RCORRECTRANSWERR-
StaticRwaterRlevel
D1 /D2 QUESTIONS WITH CORRECT
ANSWERS 2025
TheRonlyRabsolutelyRreliableRmethodRofRbackflowRpreventionRisRtheRuseRofR-RCORRECTRANSWERR-AirRGap
TheRbubblesRformedRinRaRpositiveRmultipleRtubeRfermentationRtestRareR-RCORRECTRANSWERR-
CarbonRDioxide
TheRmaximumRrateRofRwithdrawalRofRgasRfromRaR150lbRchlorineRcylinderRinR24-hoursRisR-
RCORRECTRANSWERR-40Rlbs
IfRyouRencounterRaRliquidRchlorineRleakRinRaRoneRtoneRcontainer,RwhatRactionRshouldRyouRtakeRfirst,RtoRredu
ceRtheRseverityRofRtheRleak?R-RCORRECTRANSWERR-RotateRtheRcontainerRtoRplaceRtheRleakRatRtheRtop
TheRmostRcommonlyRusedRwaterRdisinfectantRinRtheRUnitedRStatesRisR-RCORRECTRANSWERR-Chlorine
WhenRcollectingRaRdistributionRsystemRsample,RtheRwaterRshouldRbeRallowedRtoRrunRforRaRperiodRofRtimeRp
riorRtoRsampleRcollection.RHowRlongR-RCORRECTRANSWERR-
AsRlongRasRnecessaryRtoRpermitRcleaningRofRserviceRline
SampleRbottlesRwichRareRfurnishedRbyRaRcertifiedRlaboratoryRforRcollectionRofRbacteriologicalRsamplesR-
RCORRECTRANSWERR-AreRreadyRtoRuse
TheRdifferenceRbetweenRwaterRpressureRupstreamRandRdownstreamRofRaRpumpRwhenRitRisRnotRinRoperatio
nsRisRknowRasRtheR-RCORRECTRANSWERR-TotalRstaticRhead
ARdeviceRthatRautomaticallyRshutsRoffRflowRinRanRelevatedRstorageRtankRwhenRtheRwaterRlevelRinRtheRtankRr
eacheRaRpresetRlevelRisRtermedRaR-RCORRECTRANSWERR-AltitudeRvalve
InRanRoccupiedRtrenchRrequiringRpersonalRegressRwhatRisRtheRmaximumRallowableRdistanceRbetweenRaRwo
rkerRandRanRexitRletterR-RCORRECTRANSWERR-25Rfeet
, ARwaterRbearingRformationRinRtheRsoilRisRreferredRtoRasR-RCORRECTRANSWERR-AnRaquifer
TheRdistanceRbetweenRtheRstaticRwaterRlevelRandRtheRpumpingRwaterRlevelRisRtermedRtheR-
RCORRECTRANSWERR-Drawdown
ToRpreventRtheRentryRofRsurfaceRcontaminationRintoRaRwellRisRtheRpurposeRofR-RCORRECTRANSWERR-
SanitaryRseal
TheRpresenceRofRcoliformRbacteriaRinRaRdistributionRsystemR-RCORRECTRANSWERR-
IndicatesRthatRpathogenicRorganismsRmayRbeRpresentRalso
TheRmostRcommonRvalveRtypeRinRwaterRdistributionRsystemRisRtheR-RCORRECTRANSWERR-GateRvalve
ARVenturiRisRaRdeviceRusedRtoR-RCORRECTRANSWERR-MeasureRwaterRflow
BackspinRisRoccurringRafterRwellRshutRdownRthisRindicatesR-RCORRECTRANSWERR-ARfaultyRcheckRvalve
ARphRreadingRofR6.0RunitsRindicatesRtheRwaterRsampleRisR-RCORRECTRANSWERR-SlightlyRacidic
ChlorineRgasR-RCORRECTRANSWERR-IsRheavierRthanRair
TheRchangeRinRwhat'reRdemandRduringRtheRcourseRofRaRdayRisRcalledR-RCORRECTRANSWERR-
DiurnalRvariation
CatholicRprotectionRisRaRsystemRusedRforR-RCORRECTRANSWERR-MetallicRcorrosionRinhibition
TheRelevationRofRtheRfreeRsurfaceRinRaRwaterRtableRwellRwichRisRnotRrunningRisRcalledR-RCORRECTRANSWERR-
StaticRwaterRlevel