Studies are made to  evaluates the status of coliform bacteria in the Shoolkere lake, Bangalore, Karnataka. Microorganisms are widely distributed in nature and are found in most natural waters. Water contamination with pathogens and pollutants create many health problems for the people consuming the water in studded area. As such, water quality in relation to human health is an important fact and water borne infections are most common. Considering the increasing urban population and the resulting urban liquid sewage, an attempt has been made to ascertain the bacteriological quality of Shoolkere Lake. The study was carried out for a period of three years (January 2010 to December 2012) giving the monthly variation of Total coliform and Faecal coliform using Membrane Filter (MF) technique. The bacteriological observations indicated the highest peak of total coliform and fecal coliform load showed the maximum count in premonsoon and monsoon season which declined subsequently in postmonsoon season. The bacteriological analysis in the present study indicated that coliform showed significant seasonal variation. The implication of the present result is that the coliform count is above the permissible limits of WHO standards and hence the water poses a health risk to the people consuming it.