During disaster, management of essential services is a daunting task. Water supply systems (WSS) are susceptible to natural disasters like earthquakes, floods and famine and also face threat from man-made disasters. Since water is the basic need of living being, restoring it is a major challenge to water engineers in such a scenarios. In such events, engineers learn lessons and take precautionary measures to avoid threats from such disasters. Ambernath Badlapur WSS faced the flood damage after unprecedented rainfall of 26 July 2005. The system collapsed due to failure of the source. Engineers from Maharashtra Jeevan Pradhikaran (MJP) restored water supply within a week's period after great hard work. However, functioning of water supply system post disaster is an important aspect of any WSS. A case study of post disaster work of Ambernath Badlapur WSS is presented here.