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Drainage and wastewater management plan

Our 25-year strategic plan for wastewater assets

What is a Drainage and Wastewater Management Plan (DWMP)?

Our Drainage and Wastewater management plans set out our 25-year plan for our wastewater services. They provide us with the opportunity to understand the impact on our network from things such as:

  • Population growth: New housing developments and increased occupancy of exisiting homes
  • Climate change: More volatile weather, severe rainfall events, longer dry periods
  • Urban creep: Paving over urban areas such as parks and gardens, removed natural soakways for rainwater run off

The way we respond to these challenges will shape the future for our customers and the region where we live and work for years to come. It is essential that the plan is fit for purpose for both our environment and our customers.

View our plans

A new storm water storage tank is being built

Our current plan DWMP 23

Our first DWMP was published in 2023 and can be found here.

Learn more about DWMP 23
Two SWW employees walking towards water storage tanks

Our next plan DWMP 28

Cycle 2 of the DWMP process is now underway and will be published for consultation in autumn 2027.

Learn more about DWMP 28

Our investment programme

Our Turning the Tide programme will invest £760m to target storm overflows throughout the region, finding tailor-made solutions for each place.
Our investment programme image