Our Drainage and Wastewater Management Plans
Our DWMP covers the whole of our operating region across Kent, Sussex, Hampshire and the Isle of Wight. It identifies the investment needed over the next 25 years to improve the performance of our 381 wastewater (sewerage) systems and create resilient and robust wastewater services for our 4.7 million customers. During the development of our DWMP, we worked with other organisations who have responsibilities for managing water within the 11 river basin management catchments in the South-East of England – see map below.
Our first DWMP (known as DWMP23) was produced following national guidance from WaterUK. It was published in May 2023.
The Environment Act 2021 set out new legal requirements for water companies (sewerage undertakers) to prepare, publish and maintain a Drainage and Sewerage Management Plan, known as the Drainage and Wastewater Management Plan (DWMP). The Government published new Guidelines for Statutory Drainage and Wastewater Management Plans (DWMPs) in May 2025.
We have commenced work to prepare our first statutory DWMP. We will provide further information on our programme for developing our next DWMP soon.
The 11 river basin catchments across our operating region
