An attempt was made in the present study to develop a standardized scale to analyses the livelihood security of farmers in Kolar district after the implementation of K.C. Valley project where sewage treated water is supplied from Bangalore is filling the tanks of Kolar district. The livelihood security scale consists of seven dimensions viz., food security, economic security, health security, social security, ecological security, psychological security and physical security and the scale was considered highly reliable and valid. The livelihood scale consists of 47 statements were administered to 32 farmers of Malur taluk during 2020-2021. It is found that farmers have been spread over better to average (69.45 %) level of livelihood category followed by poor livelihood category (30.55 %).