Groundwater acts as a lifeline in the coastal regions to meet out the domestic, drinking, irrigational and industrial needs. Groundwater samples were collected from different locations in and around Ramanathapuram District and analyzed for their physicochemical parameters. To investigate the hydrogeochemical characteristics of groundwater and its suitability, thirty groundwater samples were collected from Ramanathapuam District for the period of January 2022 (winter) and April 2022 (summer) seasons respectively. The water quality assessment has been carried out by evaluating the physicochemical parameters such as Electrical Conductivity (EC), Bicarbonate (HCO3), Calcium (Ca), Magnesium(Mg), Chloride (Cl), Sodium (Na), Potassium (K) and Sulphate (SO4). The main objectives are to study about the spatial variations of cations and anions of the water type and by using USSL diagram whether it is suitable for irrigation or not.