Fluoride (Fâˆ’) content varies from 0.60 to 1.80 mg/L in the coastal region between Chirala and Ongole of Andhra Pradesh, India. It exceeds the threshold limit of 1.20 mg/L in 20 % of the total groundwater samples. The aim of the present study is to assess the controlling factors of Fâˆ’ content. The study area experiences a dry climate and is underlain by Charnockite Group of rocks over which the river and coastal alluvium occur. The results of the study identify the four factors that control the high Fâˆ’ content. First one is related to alkalinity, leading to active dissolution and leaching of Fâˆ’-bearing minerals, which supports the positive correlation of Fâˆ’ with pH and HCO3 âˆ’. A longer water residence time in the clays is the second factor, which activates not only solubility and dissolution of Fâˆ’-bearing minerals, but also anion exchange between Fâˆ’ and OHâˆ’. Third factor is a result of higher Na+ due to impact of saline water, ion exchange between Na+ and Ca2+, and precipitation of CaCO3. This reduces the Ca2+ content, causing dissolution of CaF2 to maintain the chemical equilibria, which is supported by positive correlation between Na2+ and Fâˆ’. The influence of anthropogenic activities is the last factor, which acts as an additional source of Fâˆ’. Thus, the shallow groundwater shows higher content of Fâˆ’ and the hydrogeochemical facies also support this hypothesis. The study suggests the remedial measures to reduce the Fâˆ’ content.