The award was given to CMWSSB for effective distribution of drinking water in developing countries in the year 2013-14, a state government release here said.
The award was presented by the President of the European Commission Jose Manuel Barroso, also former Prime Minister of Portugal, it added.
In 2013-14, for the second consecutive year, Chennai had received lower rainfall, resulting is low storage levels in reservoirs, it said adding that the then Chief Minister J Jayalalithaa had taken steps to address the shortage.
