Environmental Impact

Map views to support Water Efficiency

The interactive Water Efficiency maps below show the collated national geographical boundaries relating to the management of water resources. Bringing together three levels of detail, regional, area and zonal, they provide a high level national reference. These have been designed to be used in conjunction with the Water Efficiency dashboard, which is available to view on the MOSL Portal.

These outputs have been developed in conjunction with the Retailer Wholesaler Group (RWG) Water Efficiency sub group and RWG Water Efficiency Action Plan to support Headline Action 2: “Better use and smarter sharing of data”. These outputs will support collaboration between wholesalers, retailers and the water resource regional groups by providing greater visibility of national non-household demand. This will in turn improve our understanding of how to best support customers in reducing water wastage and forecasting demand.

The three supporting map views show geographic boundaries and summary attributes for the six water resource planning regions, 23 water company-based water stress areas in England and the 138 water resource zones in England and Wales.

These map views use collated geographic boundary data provided by each of the water companies as part of Water Resource Management Plan 19 (WRMP19) from water companies and Environment Agency water stress designations 2021.

The information contained within these Water Efficiency maps is provided to MOSL by water companies and the Environment Agency, and MOSL gives no warranty and accepts no responsibly or liability for the accuracy of completeness of the information on this website. We will not be liable for any reliance on the information on this website or for the non-availability of the website. The boundaries shown are indicative and are not intended to be used at the individual premise level. MOSL takes no responsibility for determining supply boundaries. For specific queries relating to supply please contact the relevant water companies directly.

You will need to be logged into your MOSL account to view these maps. If you do not have an account, this can be requested by trading parties and industry stakeholders using the 'Sign up' button in the top navigation bar.

Water Resource Planning Regions

Names and boundaries of the six regional water efficiency groups.


Water Stress Areas

Names, boundaries and designations of the 23 water company-based Water Stress Areas in England.


Water Resource Zones

Names, boundaries and water deficit categorisations of the 138 Water Resource Zones (WRZs) in England and Wales.


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