This study was aimed to investigate the trophic status of Porur lake of Chennai city. Physico-chemical parameters for unfiltered surface water samples were analyzed by the methods of APHA (2005). The sample was collected from 1999 to 2001. By determining the water quality status from the result we can come to a conclusion that the Porur lake was at rim to be eutrophicated. This study will give a special emphasis on the determination of the levels of pollution and the identification of polluted lakes and providing some probable remedial measures for polluted lake of Chennai city.