For instance, the total coliform level in Kammasandra Lake is 240 million MPN/100ml; in Seegehalli Lake, it is 2.4 million MPN/100ml; in Varthur Lake, it is found to be 17 million MPN/100ml; and in Kammagondanahalli Lake it is 2.2 million MPN/100ml. Groundwater experts say while the lake water is not directly being used for drinking purposes, it can contaminate shallow water aquifers in the area, rendering them unfit for drinking too.