Arsenic contamination of ground water has been reported from Malda, Murshidabad, Nadia, North & South 24 Parganas, Barddhaman, Hugly, Howrah and Kolkata. Seventy nine blocks of nine districts of West Bengal are affected with the arsenic problem. It is suspected that 6 million people are exposed to arsenic contaminated water (>50g/l) (IARC 2004). Earliest report of arsenic related health problem in West Bengal has been published from School of Tropical Medicine, Kolkata.