Groundwater analysis is carried out to identify the quality of groundwater due to increase in population, industrial growth in Chennai city. Intrusion of seawater was determined using hydro geochemical ions to know the origin of salinity in the coastal areas of Chennai city. Samples were collected monthly in the year of 2012 from the coastal areas of Chennai city and analyzed. The distribution of ions indicates that variation of sodium and chloride are more towards the seashore and calcium and bicarbonate are dominating ions in the interior part of the Chennai city. Gibbs plot indicates that evaporation is the dominating process towards the coastal areas. Piper diagram indicates that field I and II were the dominating faces. Integrated GIS Analysis was assessed to determine the quality of water and intrusion of seawater based on ionic ratio.
