pplymostofthisdrinkingwater(ChowdhuryandJakariya,).ThisinvolvesscreeningofwaterinmillionsofTW,andraisingcommunityawarenessaboutthehealthproblemsrelatedtochronicAsexposurefromdrinkingwater.AnoverallriskassessmentincludingacomponentofmitigationforAscontaminationshouldbebasedonaccuratedeterminationofAslevelsinTWwaterusingeconomicallyviablemethodsforAsscreening.FieldtestkitsofferamorepracticaltoolthandwaterhasemergedasthelargestenvironmentalhealthdisasterputtingatleastmillionpeopleatriskofcancerandotherAs-relateddiseases.RecentstudiesindicatetheoccurrenceofgeogenicAsintheCentralGangeticPlainsofUttarPradesh,Bihar,JharkhandandtheBrahmaputravalleyinAssam,andseveralregionsofMadhyaPradeshandChattisgarh,India(Chakrabortietal.,;Mukherjeeetal.,).Duringthepastfewyears,AshasalsobeendetectedingroundwatersofthesedimentaryaquifersoftheTeraiBeltinSouthernNepal(Bhattacharyaetal.,;Tand