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Sirkali region is under Nagapattinam district of Tamilnadu, India. The water quality in this region is affected significantly by Tsunami, 2004. Historical data on groundwater quality of observation wells of the study area before Tsunami were collected (1966 – 2012) and groundwater samples after Tsunami were also collected and analyzed for water quality parameters. Spatial analysis of water quality parameters before and after Tsunami was carried out. Various maps were prepared using ILWIS. Results show that there is significant degradation in the water quality due to Tsunami in the study area. Vertical electrical soundings [VES] were conducted in the study area. Based on hydro geological conditions, the approximate depth to freshwater/saltwater interface of Sirkali taluk is 4.489 m.