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Abstract-
Water is essential for all living organisms for their existence and metabolic process. Unethical human intervention in natural system and over exploitation of groundwater resources induces degradation of its quality. In many instances groundwater is used directly for drinking as well as for other purposes, hence the evaluation of groundwater quality is extremely important. The present study is aimed to analyze the underground water quality at Aligarh. In this study 80 water samples were collected from 40 places and analyzed for 14 water quality parameters for pre-monsoon and post-monsoon seasons (2012). The water quality index of these samples ranges from 18.92 to 74.67 pre-monsoon and 16.82 to 70.34 during post-monsoon. The study reveals that 50 % of the area under study falls in moderately polluted category. The ground water of Aligarh city needs some treatment before consumption and it also needs to be protected from contamination.