It is very essential to know the concentration of fluoride in drinking water. In this study, fluoride concentration and some other parameters of the ground water of Tengakhat circle of Dibrugarh district, Assam was measured. 35 water samples were collected from different villages of the circle. The sources of all the water samples were hand tube wells, motor pumps and deep tube wells. Ground water of the region was found slightly acidic in nature. Fluoride level varies from .0785 mg/L to .8152 mg/L. Calcium and magnesium concentration were found quite low.
