ALAM, M. Jahid1, BHATTACHARYA, Prosun2, AHMED, Kazi Matin3, AKTER, Nargis1, VON BRÖMSSEN, Mattias4, ISLAM, Md Tahmidul5, SHARMA, Sanjeev6, HASIN, Morshedul3 and RUSSEL KHAN, Eheteshamul7, (1)WASH Section, UNICEF Bangladesh, Sher-E-Bangla Nagar, Dhaka, 1207, Bangladesh, (2)Department of Sustainable Development, Environmental Science and Engineering, KTH Royal Institute of Technology, Teknikringen 10B, Stockholm, SE-100 44, SWEDEN, (3)Department of Geology, University of Dhaka, Dhaka, 1000, Bangladesh, (4)Soil and Water Environment, Ramböll Sweden AB, Stockholm, SE-104 62, Sweden, (5)KTH-International Groundwater Arsenic Research Group, Department of Sustainable Development, Environmental Science and Engineering, KTH Royal Institute of Technology, Teknikringen 10B, Stockholm, 11428, SWEDEN, (6)ExcelDots AB, Svartviksslingan 90, Stockholm, SE-16739, SWEDEN, (7)Department of Public Health Engineering, 14 Shaheed Captain Monsur Ali Sarani, Kakrail, Dhaka, 1000, Bangladesh