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Abstract. Groundwater has been a very potential resource to humanity for ages, but human activities have led to the degradation of this resource. One of the major activities is letting the untreated sewage into freshwater storage tanks or river without proper treatment. Due to this activity, the freshwater is also getting contaminated by mixing wastewater and making the whole water unable to use. This mixing in the unlined storage tanks leads to the possibility of sewage infiltration into the ground, which causes deterioration of groundwater quality. This problem was identified in Kovilpatti, Tamil Nadu, India and an attempt was undertaken to access the quality and suitability of groundwater. Twenty-two groundwater samples have been collected and tested for various physicochemical parameters. The result shows that the TDS concentration has been on the upward, which causes groundwater quality deterioration. Hence, proper management is required to minimize the transport of contaminants. A proper treatment facility must be constructed at the earliest to treat sewage generated in the Kovilpatti municipality.