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The objective of the study is to investigate the fluoride pollution of groundwater in the South east coastal regions of Tamil Nadu, India. Totally 36 ground water samples have been collected from open dug well, hand pump and bore wells in the east coastal region from Rameshwaram to Thiruvanmiyur during the year 2011. Samples were analysed to find out the fluoride ion along with physical and Chemical Parameters. The fluoride content of ground water ranges from 0.02 to 1.54ppm suggests domestically not suitable. All the samples observed low amount of fluoride (< 0.5mg/l) in the study area. Four out of 36 samples (Kottaipaattinam, Vedharaniyam, poombukar and Aaraiyankuppam) observed within the permissible WHO limit for safe drinking water (O.5-1.5 mg/l). Two samples (Adhirampattinam(1.54mg/l), Aalappakam(1.53mg/l)) exceed the limit for fluoride in drinking water set by the WHO.. Understand the hydro geochemistry of fluoride in groundwater by the mechanisms of mobilization of fluoride with correlation coefficient taken in the study area.