The BEST Undertaking may not have lived up to its name, wasting thousands of litres of drinking water to wash its buses, but it’s the Mumbai Metro that is setting the best example in water conservation with a three-pronged approach: Firstly, it has cut the amount of water used to wash the interior of the trains from 200 litres per rake to 20 litres – a whopping 90% cut. Water is also used to wash the exteriors, but 80% of that water is then reused for gardening or other purposes. What’s more, most of the water used for washing is sourced from rainwater harvesting.

To make cleaning easier and reduce water usage, a chemical solution is being used on the floors of the Metro trains to repel dirt. As a result, water consumption has gone down by 90%