Welcome to the Drainage and Wastewater Management Plan (DWMP) customer portal

The DWMP is made up of a lot of individual documents, and they are all available here.

The purpose of the DWMP Portal is to display our plan geographically to allow our customers to view their forecasted risks up to 2050. The plan is modelled, it does not display live or historic information.

The customer portal has been designed to make the findings of the DWMP more accessible and can be accessed using the link at the bottom of this page.

What are we showing on the portal?

The DWMP covers wastewater drainage. It does not cover risks which may come from sources we do not own such as highway gullies and rivers. Despite this, drainage is extremely complex and often risks are shared with other drainage owners such as the Local Authorities and the Environment Agency. That is why we are developing a plan to address these risks in partnership with other organisations so there is a joined up and sustainable approach to reducing risks.

Modelling has been completed for a range of assessments to understand and reduce risks to our customers.

The results shown on the portal assume we are not doing anything to reduce risk. We do maintain and monitor our network daily and naturally, we are looking at how we can manage these risks through a wide range of solutions and in partnership with other organisations. In short, the results shown are the ‘worst case’ scenario.

Our assessments can be broken down into three main categories:

Sewer flooding – focusses on the forecasted flood risk from sewers. It includes flood risk due to rainfall, climate change, population growth, urban development, structural failures and blockages.

Environment – focusses on the risk to the environment from the wastewater network which occurs as a result too much rainfall, climate change, population growth, urban development, structural failures or a blockage.

Sewer condition - refers to the integrity of the sewer network and incorporates the risk associated with blocked sewers and collapsed sewers.


Please be aware that the portal will not work on internet explorer.

Frequently asked questions

  • Understanding different risks helps us to understand areas that we may need to prioritise across the North West.

    From an ever changing coastline in the west to the tranquillity of our moors of the Pennines, as well as everything in between; the North West has a real mixture of landscapes with many new and changing challenges facing us. Climate change and accommodating a growing population are just an example of some of these challenges and these all have an impact on the risks we face. Developing the DWMP has highlighted how risks may change over time in the face of these pressures - this is what we are sharing with you on this customer portal.

    To demonstrate what the drainage and wastewater challenge is for the North West, we have categorised our main risk areas into assessments. The results of these assessments have been grouped into three levels of priority:

    No concern - where modelled results for that drainage area have identified that there is no concern.

    Potential area of focus - where modelled results for that drainage area have identified that the area could become an area of focus and so we should continue to monitor.

    Area of focus - where modelled results for that drainage area have identified it as an area of focus so we should continue to actively monitor.

    For each assessment, the results have been reviewed fairly across the region so potential investment is not only focussed on larger areas with naturally higher results. This does mean that the results for smaller areas may appear to be slightly inflated. To review how each assessment was carried out, please refer to the main document.

  • A drainage area is an area which drains to a wastewater treatment works via our sewer network and pumping stations. Seeing where your wastewater ultimately ends up may surprise you as some drainage areas are large - it may be a long journey! But when planning for drainage and wastewater it makes sense for us to plan for an area in this way as each acts as an individual system. All information shown on the customer portal is the risk for that drainage area, there is no property specific information.

  • Information is not displayed for some drainage areas for a number of reasons:

    • Our modelling has shown that the risk in that area is considered minimal and so a detailed assessment was not required. This does not mean the area will be forgotten, we will be re-running the first stage assessments for every drainage area on an annual basis once the previous year’s data is reviewed. This will identify any new risk assessments that may be required.

    • Property blight – we have to protect our customer’s personal data and only share information that cannot be identified to specific properties. This has meant that for our very small catchments (below a population equivalent of 250), no information will be displayed.

      • We must extend this further for our sewer flood risk information as this flooding directly impacts property. We have to consider the impact to our customers who may experience or are predicted to experience sewer flooding. This is not a nice experience and we work hard to avoid flooding from our sewers. We have shared information where our modelling suggests sewer flooding may be a concern, however to abide by the General Data Protection Regulation (GDPR) and to protect our customers interests, information for sewer flood risk is only presented where the population equivalent is over 2,000.

    • The DWMP covers areas served by the public sewer network. There will be no information for areas served by private drainage.