We monitored the quality of ground water of Tinsukia town master plan area of the Tinsukia district, Assam which is a major industrial town of North – East India. In this study, fluoride concentration along with metals - calcium and magnesium and some physico-chemical properties were measured. Using Elico Ion Analyzer (Model: LI 126) and ORION 9609BNWP electrode, fluoride concentrations were measured and EDTA Titrimetric method was employed to measure the metals -calcium and magnesium. pH was measured at the time of collection of water samples with pocket pH meter(HANNA made). 30 water samples were collected from different locations of the study area. All the water samples were collected from hand tube wells, motor pumps and public water supply schemes. Ground water of the study area is found slightly acidic in nature. Fluoride level varies from 0.0912 mg/L to 0.2283 mg/L. In all the water samples fluoride concentration is found quite below than the acceptable range 0.6 mgL-1 to 1.2 mgL-1. No case of dental or skeletal Fluorosis is found in this area.
