Where water comes from

We rely on rain for our water supply. More than two thirds (almost 70%) of the water we supply comes from boreholes – deep wells which collect rainwater after it has filtered through rock layers.

This ‘groundwater’ is mostly found in huge chalk deposits which are widespread across our region.

A further 23% comes from rivers and the remaining seven per cent from reservoirs.


We rely on winter rainfall to refill reservoirs and top up groundwater storage to see us through the dry, summer months.

Find out more information about how we manage our water resources and how we plan to secure water supplies for our customers during the next 25 years.