Storm Overflows Improvement Plan

A summary of our plan

We are committed to completely eliminating the discharge of untreated sewage, starting with storm overflows that discharge most frequently and those that have any environmental impact.

We plan to spend £150 million on storm overflows between 2022 and 2025 to reduce their impact on the environment, which we estimate will help us to achieve around a 25% reduction in the number of hours they operate for.

What does the plan involve?

Our aim is to address the problem of storm overflows by prioritising investment based on impact, while also delivering solutions at an affordable pace and in a way that has a low operational and embedded carbon footprint and maximises a multitude of benefits.

Our plan explains how we are:

• increasing monitoring
• increasing the separation of rainwater from foul water
• increasing treatment capacity for combined sewage
• increasing storage for combined sewage

Achieving these four goals will enable us to better deal with extreme weather conditions, which will help reduce the operation of storm overflows and protect our rivers and the sea.