Class A Water Operator| exam questions
ys ys ys ys ys ys
and answers
ys
HowysmanyysTrainingysHoursysandysexperienceysforysaysclassysDysWaterysOperatorys-yscorrectysanswers-
16ysHoursysTrainingysandysNoysExperience
HowysmanyysTrainingysHoursysandysexperienceysforysaysclassysCysWaterysOperatorys-yscorrectysanswers-
36ysHoursysTrainingysandys1ysyearysExperience
HowysmanyysTrainingysHoursysandysexperienceysforysaysclassysBysWaterysOperatorys-yscorrectysanswers-
100ysHoursysTrainingysandys3ysyearsysExperienceys(mustysincludeys1ysyearysofyshandsysonysexperience)
HowysmanyysTrainingysHoursysandysexperienceysforysaysclassysAysWaterysOperatorys-yscorrectysanswers-
200ysHoursysTrainingysandys5ysyearsysExperienceys(mustysincludeys2ysyearsysofyshandsysonysexperience)
HowysmanyysTrainingysHoursysandysexperienceysforysaysClassysCysLabysOperatorys-yscorrectysanswers-
32ysHoursysandysnoysexperience
HowysmanyysTrainingysHoursysandysexperienceysforysaysClassysBysLabysOperatorys-yscorrectysanswers-
32yshoursysofysCysandys32yshoursysofysBysandys6ysmonthsysexperience.ys***associateysinysscienceyscanyssubstituteys3
2hrsysofysCyslevelystraining
HowysmanyysTrainingysHoursysandysexperienceysforysaysClassysAysLabysOperatorys-yscorrectysanswers-
32yshoursysofysBysandys1ysyearysexperience.ys***MustysincludeysaysBachelorysinysscience
HowysmanyysTrainingysHoursysandysexperienceysforysaysClassysCysDistributionysOperatorys-yscorrectysanswers-
36hoursysandys1ysyearysexperience
HowysmanyysTrainingysHoursysandysexperienceysforysaysDistributionysTechnicianys-yscorrectysanswers-
8yshoursysandysnoystraining.
CommunityysWaterysSystemys-yscorrectysanswers-
Ayspublicyswateryssupplyysthatyshasysatysleastys15ysserviceysconnectionsysorysservesys25ysorysmoreyspersonsysonysaysr
egularysbasis
PrimaryysContaminantsys-yscorrectysanswers-
ContaminantsysidentifiesysbyystheysEPAysasysharmfulystoysumalyshealth
MaximumysContainmentysLevelys(MCL)ys-yscorrectysanswers-
Theyslevelysinyswhichyscontaminantsysmustysnotysexceedysoryspublicysnotificationysisysrequired.
Cryptosporidiumys-yscorrectysanswers-
Aysmicrosocpicysparasiteysthatyscanysbeysfoundysinyswater.ysItysproducesyscystsysthatysareysveryysresistantystoysharsh
ysenvironmentalysconditions.ysItysisysresponsibleysforysintestinalysillnessyscalledyscryptosporidiosis.ysSymptomsysi
ncludeysdiarrhea,yscramps,ysgas,ysbodilyysdiscomfort,ysfatigue,ysandysweightysloss.ysOccursysoneysweekysafterysex
posureysandyscanyslastysforys1-4ysweeks
DisinfectionysProfilingys-yscorrectysanswers-
Ayswateryssystemysassessesystheyslevelysofysdisinfectionyscurrentlyysprovidedysandysthenysdeterminesystheysimpac
tysaysproposedyschangeysinysdisinfectionyspracticeyswouldyshave.
E.yscoliys-yscorrectysanswers-
Aysbacteriumysthatysisyscommonlyysusedysasysanysindicatorysofyshumanyshealthysriskysfromysharmfulysmicroysorgani
smsysthatyscanysbeyspresentysinyswater.ysSymptomsysincludeysseveryscrampsysandysdiarrhea.ysBloodysisysoftenyssee
nysinystheysstool.ysSymptomsysbeginys1-9ysdaysysafterysexposureysandyslastysaysweekysorysless.
Giardiays-yscorrectysanswers-
Aysmicroscopicysparasiteysthatyscanysbeysfoundysinyswater.ysItysproducesyscystsysthatysareysresistantystoysharshysenvi
ronmentalysconditions.ysGiardiayscausesysintestinalysillnessyscalledysgiardiasis.ysSymptomsyssimularystoyscryptos
, poridiosis.ysVomition,yschills,ysheadacheysandysfeverysmayysalsoysoccur.ysSymptomsysbeginysoneysweekysafterysex
posureysandyscanyslastysupystoysaysmonth.
HardysWaterys-yscorrectysanswers-
Ayscharacteristicysofyswateryscausedysmainlyysbyystheyssaltsysofyscalciumys(Ca++)ysandysmagnesiumys(Mg++).ysUnd
esirableysdueystoysformationysofyssoapyscurds,ysincreaseysuseysofyssoap,ysandysscaleysdepositsysinysboilersysandyswa
terysheaters.ysDefinesysasyshavingyshardnessysofys100mg/Lysorysgreater
MaximumysResidualysDisinfectantysLevelys(MDRLs)ys-yscorrectysanswers-
Theyshighestyslevelysofysdisinfectantysallowedysinysdrinkingyswater.ysStandardsyssetysbyystheysUSysEPA
MicrobialysPathogensys-yscorrectysanswers-Micro-organismsysthatyscauseysdisease
SafeysDrinkingysWaterysActys(SDWA)ys-yscorrectysanswers-
AnysActyspassedysbyystheysUSysCongressysinys1974.ysItysestablishesysayscooperativeysprogramysamongyslocal,ysstate,
ysandysfederalysagenciesystoysensureyssafeysdrinkingyswaterysforyscustomers.
Chys1ys-ysOneysgallonysofyswaterysweighsys-yscorrectysanswers-8.34yspounds
Chys1-ysTheysaverageysdomesticyswaterysusageysperyspersonysperysdayysisysusuallyyssomewhereysinystheysrangeysofys-
yscorrectysanswers-100-130ysgallons
Chys1ys-
Probablyystheysmostysimportantyssourceysofysinformationystoysuseyswhenysimplementingyschangesysinysprocessysc
ontrolysatysayswaterysplantysisys-yscorrectysanswers-LabysResults
Chys1ys-ysTheysmostysimportantysdutyysofysayswaterysplantysoperatorysisystoys-yscorrectysanswers-
Helpystoysprotectystheyshealthysandyswell-beingysofystheyscommunity
Apparentyscolorys-yscorrectysanswers-Theyscolorysvisibleysinyswater
Trueyscolorys-yscorrectysanswers-
Dissolvedysmaterialyscontributionystoyscolorysandysisysnotysremovedysthroughyssimpleysfiltrationys(i.e.yscoffeeysorys
tea).ysMeasureysinysColorysUnitsys(CUs)ysusingysaysclearysglassystubeyscalledysaysNesslerystub.
Turbidityys-yscorrectysanswers-
Particlesyssuspendedysinyswater.ysTheseysparticlesyscanysbeysremovedysthroughysfiltration.ysThisysisysconsideredysa
ysprimaryyscontaminantysbyystheysEPA.ysTheseysparticlesyscanyssurroundysandysprotectysharmfulysmicroorganisms
ysfromysbeingysdestroyedysbyyschlorination.
NephelometricysTurbidityysUnitys(NTUs)ys-yscorrectysanswers-Aysmeasureysofysturbidity
H+ys-yscorrectysanswers-hydrogenysion
OH-ys-yscorrectysanswers-hydroxideysion
CarbonateysHardnessys(CH)ys-yscorrectysanswers-
Temporaryyshardnessyswhichysisysalwaysysalkalinity.ysCalciumysandysmagnesiumysionyscombineyswithyscarbonate
,ysbicarbonate,ysandyshydroxideysionsystoysformyscarbonateyshardness.ysCarbonateysHardnessysprecipitatesysoutys
withysheat.
NoncarbonateysHardnessys(NCH)ys-yscorrectysanswers-
PermanentysHardness.ysCalciumysandysmagnesiumyscombineyswithyssulfateysandyschlorideysionsystheysresultysisys
non-carbonateyshardness.ys(Noncarbonateyshardnessys=ystotalyshardnessys-ystotalysalkalinity)
Alkalinityys-yscorrectysanswers-
TheysabilityystoysresistyschangesysinyspHysinysresponseystoysdiluteysacidsysorysdiluteysbases.ysWhileyspHystendsystoysbe
yshighyswithyshighysalkalinity,ysitysisysnotysalwaysystheyscase.ysAlkalinityyscanysbeyspresentysinyslowyspHysconditionsysa
syswell.
ChemicalysionsysthatysformysAlkalinityys-yscorrectysanswers-Hydroxideys(OH-),yscarbonateys(CO3--
),ysandysbicarbonateys(HCO-).ysTheyspHysofyswaterysdeterminesyswhichysofystheseysthreeysionsysareyspresent
Totalysalkalinityys(T-alk)ys-yscorrectysanswers-
Theystotalysamountysofysalkalinityyspresent).ysHasysayspHysofysbetweenys4.5-
14.0.ysWateryswithyspHyslessysthanys4.5yshasyszeroysalkalinity.
ys ys ys ys ys ys
and answers
ys
HowysmanyysTrainingysHoursysandysexperienceysforysaysclassysDysWaterysOperatorys-yscorrectysanswers-
16ysHoursysTrainingysandysNoysExperience
HowysmanyysTrainingysHoursysandysexperienceysforysaysclassysCysWaterysOperatorys-yscorrectysanswers-
36ysHoursysTrainingysandys1ysyearysExperience
HowysmanyysTrainingysHoursysandysexperienceysforysaysclassysBysWaterysOperatorys-yscorrectysanswers-
100ysHoursysTrainingysandys3ysyearsysExperienceys(mustysincludeys1ysyearysofyshandsysonysexperience)
HowysmanyysTrainingysHoursysandysexperienceysforysaysclassysAysWaterysOperatorys-yscorrectysanswers-
200ysHoursysTrainingysandys5ysyearsysExperienceys(mustysincludeys2ysyearsysofyshandsysonysexperience)
HowysmanyysTrainingysHoursysandysexperienceysforysaysClassysCysLabysOperatorys-yscorrectysanswers-
32ysHoursysandysnoysexperience
HowysmanyysTrainingysHoursysandysexperienceysforysaysClassysBysLabysOperatorys-yscorrectysanswers-
32yshoursysofysCysandys32yshoursysofysBysandys6ysmonthsysexperience.ys***associateysinysscienceyscanyssubstituteys3
2hrsysofysCyslevelystraining
HowysmanyysTrainingysHoursysandysexperienceysforysaysClassysAysLabysOperatorys-yscorrectysanswers-
32yshoursysofysBysandys1ysyearysexperience.ys***MustysincludeysaysBachelorysinysscience
HowysmanyysTrainingysHoursysandysexperienceysforysaysClassysCysDistributionysOperatorys-yscorrectysanswers-
36hoursysandys1ysyearysexperience
HowysmanyysTrainingysHoursysandysexperienceysforysaysDistributionysTechnicianys-yscorrectysanswers-
8yshoursysandysnoystraining.
CommunityysWaterysSystemys-yscorrectysanswers-
Ayspublicyswateryssupplyysthatyshasysatysleastys15ysserviceysconnectionsysorysservesys25ysorysmoreyspersonsysonysaysr
egularysbasis
PrimaryysContaminantsys-yscorrectysanswers-
ContaminantsysidentifiesysbyystheysEPAysasysharmfulystoysumalyshealth
MaximumysContainmentysLevelys(MCL)ys-yscorrectysanswers-
Theyslevelysinyswhichyscontaminantsysmustysnotysexceedysoryspublicysnotificationysisysrequired.
Cryptosporidiumys-yscorrectysanswers-
Aysmicrosocpicysparasiteysthatyscanysbeysfoundysinyswater.ysItysproducesyscystsysthatysareysveryysresistantystoysharsh
ysenvironmentalysconditions.ysItysisysresponsibleysforysintestinalysillnessyscalledyscryptosporidiosis.ysSymptomsysi
ncludeysdiarrhea,yscramps,ysgas,ysbodilyysdiscomfort,ysfatigue,ysandysweightysloss.ysOccursysoneysweekysafterysex
posureysandyscanyslastysforys1-4ysweeks
DisinfectionysProfilingys-yscorrectysanswers-
Ayswateryssystemysassessesystheyslevelysofysdisinfectionyscurrentlyysprovidedysandysthenysdeterminesystheysimpac
tysaysproposedyschangeysinysdisinfectionyspracticeyswouldyshave.
E.yscoliys-yscorrectysanswers-
Aysbacteriumysthatysisyscommonlyysusedysasysanysindicatorysofyshumanyshealthysriskysfromysharmfulysmicroysorgani
smsysthatyscanysbeyspresentysinyswater.ysSymptomsysincludeysseveryscrampsysandysdiarrhea.ysBloodysisysoftenyssee
nysinystheysstool.ysSymptomsysbeginys1-9ysdaysysafterysexposureysandyslastysaysweekysorysless.
Giardiays-yscorrectysanswers-
Aysmicroscopicysparasiteysthatyscanysbeysfoundysinyswater.ysItysproducesyscystsysthatysareysresistantystoysharshysenvi
ronmentalysconditions.ysGiardiayscausesysintestinalysillnessyscalledysgiardiasis.ysSymptomsyssimularystoyscryptos
, poridiosis.ysVomition,yschills,ysheadacheysandysfeverysmayysalsoysoccur.ysSymptomsysbeginysoneysweekysafterysex
posureysandyscanyslastysupystoysaysmonth.
HardysWaterys-yscorrectysanswers-
Ayscharacteristicysofyswateryscausedysmainlyysbyystheyssaltsysofyscalciumys(Ca++)ysandysmagnesiumys(Mg++).ysUnd
esirableysdueystoysformationysofyssoapyscurds,ysincreaseysuseysofyssoap,ysandysscaleysdepositsysinysboilersysandyswa
terysheaters.ysDefinesysasyshavingyshardnessysofys100mg/Lysorysgreater
MaximumysResidualysDisinfectantysLevelys(MDRLs)ys-yscorrectysanswers-
Theyshighestyslevelysofysdisinfectantysallowedysinysdrinkingyswater.ysStandardsyssetysbyystheysUSysEPA
MicrobialysPathogensys-yscorrectysanswers-Micro-organismsysthatyscauseysdisease
SafeysDrinkingysWaterysActys(SDWA)ys-yscorrectysanswers-
AnysActyspassedysbyystheysUSysCongressysinys1974.ysItysestablishesysayscooperativeysprogramysamongyslocal,ysstate,
ysandysfederalysagenciesystoysensureyssafeysdrinkingyswaterysforyscustomers.
Chys1ys-ysOneysgallonysofyswaterysweighsys-yscorrectysanswers-8.34yspounds
Chys1-ysTheysaverageysdomesticyswaterysusageysperyspersonysperysdayysisysusuallyyssomewhereysinystheysrangeysofys-
yscorrectysanswers-100-130ysgallons
Chys1ys-
Probablyystheysmostysimportantyssourceysofysinformationystoysuseyswhenysimplementingyschangesysinysprocessysc
ontrolysatysayswaterysplantysisys-yscorrectysanswers-LabysResults
Chys1ys-ysTheysmostysimportantysdutyysofysayswaterysplantysoperatorysisystoys-yscorrectysanswers-
Helpystoysprotectystheyshealthysandyswell-beingysofystheyscommunity
Apparentyscolorys-yscorrectysanswers-Theyscolorysvisibleysinyswater
Trueyscolorys-yscorrectysanswers-
Dissolvedysmaterialyscontributionystoyscolorysandysisysnotysremovedysthroughyssimpleysfiltrationys(i.e.yscoffeeysorys
tea).ysMeasureysinysColorysUnitsys(CUs)ysusingysaysclearysglassystubeyscalledysaysNesslerystub.
Turbidityys-yscorrectysanswers-
Particlesyssuspendedysinyswater.ysTheseysparticlesyscanysbeysremovedysthroughysfiltration.ysThisysisysconsideredysa
ysprimaryyscontaminantysbyystheysEPA.ysTheseysparticlesyscanyssurroundysandysprotectysharmfulysmicroorganisms
ysfromysbeingysdestroyedysbyyschlorination.
NephelometricysTurbidityysUnitys(NTUs)ys-yscorrectysanswers-Aysmeasureysofysturbidity
H+ys-yscorrectysanswers-hydrogenysion
OH-ys-yscorrectysanswers-hydroxideysion
CarbonateysHardnessys(CH)ys-yscorrectysanswers-
Temporaryyshardnessyswhichysisysalwaysysalkalinity.ysCalciumysandysmagnesiumysionyscombineyswithyscarbonate
,ysbicarbonate,ysandyshydroxideysionsystoysformyscarbonateyshardness.ysCarbonateysHardnessysprecipitatesysoutys
withysheat.
NoncarbonateysHardnessys(NCH)ys-yscorrectysanswers-
PermanentysHardness.ysCalciumysandysmagnesiumyscombineyswithyssulfateysandyschlorideysionsystheysresultysisys
non-carbonateyshardness.ys(Noncarbonateyshardnessys=ystotalyshardnessys-ystotalysalkalinity)
Alkalinityys-yscorrectysanswers-
TheysabilityystoysresistyschangesysinyspHysinysresponseystoysdiluteysacidsysorysdiluteysbases.ysWhileyspHystendsystoysbe
yshighyswithyshighysalkalinity,ysitysisysnotysalwaysystheyscase.ysAlkalinityyscanysbeyspresentysinyslowyspHysconditionsysa
syswell.
ChemicalysionsysthatysformysAlkalinityys-yscorrectysanswers-Hydroxideys(OH-),yscarbonateys(CO3--
),ysandysbicarbonateys(HCO-).ysTheyspHysofyswaterysdeterminesyswhichysofystheseysthreeysionsysareyspresent
Totalysalkalinityys(T-alk)ys-yscorrectysanswers-
Theystotalysamountysofysalkalinityyspresent).ysHasysayspHysofysbetweenys4.5-
14.0.ysWateryswithyspHyslessysthanys4.5yshasyszeroysalkalinity.
