WPC A"0Mb<G\R8Z_\!b[^FI%bѮ[f=Bt U&j}!y^1"v+[@ZP da^750@c<|^/L9-饕t窘}*Nu Ŏ.J@P?7x?kwi o*ICރHv~!ɡz:EP]պzI!3N6nfD۹ܹ<ɥy =S"IV>8}\%g54|Tݦwد\G߫+Όet. # UN % 0(Hw@[4Lexmark 2030 ColorFine 2WWLXTEX,,,,X0nL((9 Z 6Times New Roman RegularX($C:\WP61\WPWIN\TEMPLATE\STANDARD.WPT [\]^_`abcd3$4D4h $3|xd !  ݛ  January9,1998  SummaryofsuggestionsmadeduringtheJanuary7,1998NDWACWorkingGroupConferenceCallregardingchangestheDrinkingWaterCandidateContaminantList(CCL)OforMicroorganismsOI  Formicroorganisms,thefollowingsuggestionsweremadeduringtheJanuary7,1998NDWACWorkingGroupConferenceCallregardingchangestotheCCL.ThesesuggestedchangeswerelaterconfirmedviafollowupconferencecallsanddiscussionswithEPAmicrobiologistsandotherpersonnelinCincinnatiandHeadquarters.Thissummary,inandofitself,doesnotreflectthefinalrecommendationsonmicroorganisms.̀Viruses   0  RotavirusshouldbeaddedtotheCCLinlightofpubliccommentsreceivedandNtheNNaNLnLN񛀜M1986MNMongoingM   groundwateroccurrencesurveythatindicatesitisamoreprevalentproblemthanpreviouslythought. (#(# 0  HepatitisEshouldnotbeaddedtotheCCL.Thereisnotagreementwithcommenters 4 thatthevirusisaseriousprobleminotherpartsoftheworld,andevidenceindicatesthatitisnotfoundwithintheUnitedStates. (#(# Protozoa   0  ToxoplasmagondiishouldberemovedfromtheCCL.Theorganismisthesamesizeor  largerthangiardiaandthereforewouldbecontrolledbythesamemechanismsthatcontrolgiardiaandcrytosporidiumforwhichregulationsarecurrentlyunderdevelopment. (#(# 0  BlastocystisandEntamoebahistolyticashouldnotbeaddedtotheCCL,asoutbreaks X  МPhavePPhadPnotoccurredatall(blastocystis)orQhaveQQhadQnotoccurredinthelast30years(entamoebahistolytica). (#(#  X Algae $D # 0  BlueGreenAlgae(cyanobacteria)andrelatedtoxins,includingmicotoxinshouldbeadded &"% totheCCLR,RTS,STU.UVasV񛀜WtWXTXheyhavecausedoutbreaksandarenotcurrentlybeingtracked,andtheAgencyneedstolearnmoreabouttheseorganisms.TheWorkingGrouprecommendedthatY YfreshwateralgaeandrelatedtoxinsZZbelistedinlieuof[ [bluegreenalgae,\\becausetherearefreshwateralgae]inadditionto]]besides]bluegreenalgaethatproducetoxins. (#(# 0  PfiesteriashouldbeaddedtotheCCL.AllindicationsarethatPfiesteriashabitatis T,'+ estuarineorbrackishwater.Currentdataindicatethat,likemostotherdinoflagellates, @-(, theorganismgrowspoorlyinfreshwateranddoesnotelaboratetoxinsinfreshwaterconditions.Moreover,thesizerangesfrom5450%m,withthedormantcyststages760  %mindiameter.ThusfiltrationthatiseffectiveforremovingCryptosporidium(46%m)  wouldbeeffectiveforremovingPfiesteria.t(#(# &  Bacteria L  0  Aeromonashydrophila'L ; shouldremainontheCCL.Althoughithasnotcausedan $ t outbreak,aeromonasdoesgrowwellontheinside^of^thedrinkingwaterdistributionsystem,andresearchersneedtodetermineiftheharmfulstrains`_that_`__aabthatbacausediseaseagrowinwaterdistributionsystemsccd.dcandcacausediseaseac.c (#(# 0  PseudomonasaeruginosashouldbeontheCCL.Itisanorganismthatrequiresadditional   research. (#(# 0  Salmonella,Shigella,V.cholerae,Y.enterocolitica,E.ColiO157:H7,Campylobacter,and   theArcobacter,shouldnotbeincludedontheCCL.Theyareallaproductoffecal p contaminationandthereforewouldbeaddressedbytheTotalColiformRule,aswellasbytheSurfaceWaterTreatmentRule,andbytheupcomingGroundwaterDisinfectionRuleandEnhancedSurfaceWaterTreatmentRule. (#(# Indicators H 0  ColiphageshouldnotbeaddedtotheCCL.Theseorganismsposenohealththreat,but   areanindicatoroffecalcontaminationandassucharebeingconsideredforinclusionintheupcomingGroundwaterDisinfectionRule. (#(#