To achieve its goal of ensuring water security in the city, the Chennai Metropolitan Development Authority (CMDA) is planning to conduct a detailed audit of the rainwater harvesting system across Chennai. This comes in the wake of Metro Water preparing a contingency plan to ensure uninterrupted water supply to the city as water levels in reservoirs are slowly dipping.

The development regulations of the CMDA states that rainwater harvesting is mandatory on all premises. The rainwater harvesting structures installed during the AIADMK regime in 2003 helped increase the ground water level in the city, as per a Metro Water monitoring report in 2011.