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Fluoride, an important aspect of the aquatic ecology influences not only the biological productivity but also the quality of water. Furthermore, quantum of anthropogenic influences and global volcanic activity also exerts an overwhelming effect on the concentration of fluoride in natural waters. Besides, ground water also contains higher concentrations of fluoride owing to leaching from rocks. Surinsar-Mansar ramsar site in NW Himalayas includes two lakes where Lake Mansar is the biggest one and is an only one source of fresh water to support the livelihood and biodiversity of its vicinity. Thus, the contamination in the water or imbalance in the chemistry of the lake has been always proved as the main source of epidemics in the area. Besides drinking facility, the lake provides a heavy flush of water for the agriculture practice and livestock of the area. Since Lake Mansar is a closed lacustrine system receiving water from sub-terranean springs and rains due to western disturbances in sub-continent India, hence the present study was initiated to see the fluctuation in the fluoride concentration in the lake.
