Where does our tap water come from?

Two thirds of drinking water in England and Wales comes from surface water - sources such as reservoirs, lakes and rivers. The rest of the water comes from ground water - underground geological formations that store rain water.

This water is then treated at treatments works before travelling through the water mains, often over substantial distances, to reach your home.

Further Reading

Monitoring groundwater

What could we possibly find in it?

Small traces of chemicals, microorganisms and bacteria may occasionally be present prior to treatment