Where our water comes from

Our region, like much of the South East is “seriously water-stressed”, which means a very high proportion of the water in the environment is already in use.

Our short film below illustrates the journey rainwater makes and why groundwater is so important.

We supply 2.6 billion litres of drinking water to nine million people across London and the Thames Valley every day.

Thirty-five per cent of the water we supply is pumped from natural underground reservoirs called aquifers. The other 65 per cent is pumped from rivers. However, the vast majority of river water is supplied from aquifers, making groundwater our most important source of water.

For water to reach the aquifer, the ground needs to be saturated so it soaks through to the rocks beneath. As a result, winter is the most important time for replenishing supplies.

Ever wondered how the water that you drink gets to your tap? Or what happens when you flush the loo or empty your sink?

Our water cycles will show you the journey that your water takes - from it forming in the clouds to being returned to the rivers.

Launch our water cycles

In this section

Reservoir levels and rainfall figures North London Artificial Recharge Scheme Thames Gateway Water Treatment Works