Abstract : The water samples were collected from two selected stations of the river Noyyal for the analysis of physicochemical characteristics and planktons. The study clearly indicates that the station I was unpolluted zone where as station II was found to be highly polluted as the number of parameters exceeded the tolerable limit. In addition, the phytoplankton were available in plenty at station I but only pollutant resistant species of plankton were identified at station II. The results were tabulated and discussed.