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Groundwater is generally presumed to be good for human consumption and is used as a main source of drinking water.Although there are numerous reasons for groundwater pollution,anthropogenic sources are considered as the prime ones.In this study,twenty-two groundwater samples were collected from the flood plains of upper Palar River during the pre- and post-monsoon seasons to assess the extent of pollution and effects on human health.Physico-chemical characteristics of groundwater were analyzed and compared with those of drinking water standards recommended by the World Health Organization (WHO) and the Bureau of Indian Standards (BIS).The Pipers trilinear diagram shows the nature of alkali earth with the high contents of alkalies and prevailing sulphate in the present samples.The univariate statistics and correlation analysis were performed to find out the relationships between the variables.The tannery effluents,solid wastes and sewage were suspected to be the predominant sources of pollution in the area.