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Se's presence in groundwater and surface water depends largely on soil characteristics, and anthropogenic factors relating to that area (Giri 2019). Underground water of a seleniferous region showed 2.54–69.53 μg/l of Se, whereas a nonseleniferous region was characterized by 0.25–8.63 μg/l (Dhillon and Dhillon 1991). Freshwater showed a higher level (0.06–400 mg Se/l) of Se than saltwater (0.04–0.12 mg Se/l) (Schutz and Turekian 1965; Höghberg 1986). At high altitudes, groundwater contains 0.03–0.12 and 0.00–0.11 mg/l Se in summer and winter, respectively. During summer and winter, river water contains 0.06–0.32 and 0.28–0.46 mg/l Se (Giri 2019).