Drinking water supply will be affected in the few areas of the city under the Manjeera Phase III and IV system on Saturday due to power shut down at Sadasivpet 33 KV sub-station. The areas are Lingampally reservoir, Khanapur, Hydernagar, Gudimalkapur, S. R. Nagar, KPHB Colony, Qutbullapur and Sainikpuri, said a press release from the HMWSSB.