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Naturally occurring arsenic (As) in groundwater of sedimentary aquifer has emerged as a global problem, and issue of major environmental health concern. Most groundwater from the Terai Basin of Nepal is contaminated by excess arsenic. Such groundwater is widely used for drinking and irrigation purpose and makes easy means of direct entrance of arsenic into human body and food chain; and that affects human health adversely. This paper evaluates the state of arsenic contamination in the six Terai districts of Nepal ...