Last reviewed: 27.5.2011 - 7.43pm
To ensure London has enough water in the event of a drought, we've built a new water treatment works in Beckton, east London.
The Thames Gateway Water Treatment Works will, when required, take water from the tidal Thames and use a process called desalination to remove the salt, producing high-quality drinking water.
This is mainland UK's first desalination plant. It has been designed to be as efficient and sustainable as possible.
