Phytoplankton studies at two lakes report the highest diversity in Antrolli Lake. Phytoplanktons were recorded as being highest during summer and less during rainy seasons. Guttigere Lake records 9 species and Antrolli Lake records 52 species, 1 species is common for both the lakes. A total of 32 families were recorded, in that Phacaceae is dominant. As Chlorophyta records the highest number of species, Dinoflagellate and Zygonematophyceae record the lowest number of species. Hydrobiological studies in two lakes with various physiochemical parameters like temperature, pH, TDS, Electrochemical conductivity, Total alkalinity, and Carbonates. Hydro carbonates, Dissolved oxygen, Chlorides, and Chemical Oxygen Demand were conducted monthly from March to August which includes summer and rainy seasons of the two lakes. Some major tests were conducted once in three months i.e. during the summer and rainy seasons and recorded highest in the summer season only. Antrolli Lake has fewer chemical constituents than Guttigere. So Antrolli Lake has good water which is fit for drinking as per the above results from our study.