At present, arsenic contamination is considered to be a dangerous environmental threat and a serious health risk. Arsenic contamination of drinking water is a significant healthy problem in rural areas of Bangladesh. In Bangladesh more than 90% of rural households depend on water supply from the groundwater source for drinking and other domestic usage (BGS, 2001). Due to arsenic contamination in groundwater and the extent and severity of this problem has placed a large part of the country in a most vulnerable situation. screening of 4.7 million tube - wells in arsenic affected upazilas showed...