The coastal region of Lagos, Nigeria has a long coastline with the Atlantic Ocean. Most of the groundwater aquifer in this region are used for irrigation purposes. However, the region is threatened by the problem of saltwater intrusion, due to high extraction rate of groundwater. It is very vital to mention that the analysis of this study was based on geochemical analysis of samples from the coastal parts of Lagos. The main aim of this study is to find out whether salinization of the selected wells is solely from saltwater intrusion or from other sources. In this regard, hydro-chemical data from previous investigations were analyzed and inferences made by graphical representation of chemical parameters measured. Samples from the coastal had the highest Intrusions e.g. Victoria Island and CMS.
