India is a country where sacred practices have been associated to water bodies such as immersion of idols of god and goddess into the water bodies during the festivals of Vinayaka Chathurthi, Durga Puja and Saraswati Puja. These religious practices are responsible for the contamination of water bodies. The present investigation has been carried out to assess the quality of water at an idol immersion site i.e. Boat Club, Yamuna Bazar 3, Yamuna River, Delhi during the year 2009 at three different time periods i.e. during pre-idol immersion (one month before the idol immersion at the site), immersion and post- idol immersion (one month after the idol immersion at the site). The parameters being analyzed include total hardness (TH), dissolved oxygen (DO), biological oxygen demand (BOD) and chemical oxygen demand (COD). During these investigations, it has been observed that there is an increase in the values of TH, BOD and COD during immersion and post immersion that carries a negative impact on the water quality of the River Yamuna

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