A study has been undertaken for three years for the determination of different physico chemical parameters of the water reservoir near Bahala Village Matsya Industrial area, Alwar. All the industrial effluents from Matsya Industrial area are released in this water reservoir. A total of seventeen parametres were studied and results have been presented. Most of the parameters such as nitrate, fluoride, hardness, total dissolved solids, BOD, COD etc had higher values than prescribed by WHO and ISI standards. This water is unfit for various purposes without treatment.

Keywords: TDS, DO, BOD, COD, WHO.