Storm overflows

Storm overflows

We are aware of our customers' increasing concern about the effect storm overflows have on our rivers and the sea.

Storm overflows have always been part of the sewerage network in the UK because the majority of sewers carry both rainwater and foul sewage and they prevent properties from flooding following intense rainfall. We are now getting more intense rainfall storms due to climate change, so this means the frequency of overflow operations is increasing.

On this page you can find more information about what storm overflows are, how they work and their environmental impact. We also outline what we’re doing to improve the system and how you can help us to eliminate any negative impact that could be caused by storm overflows.

The background

The impact

The next steps