The map combines the following spatial data; Postal Sectors, Water Resource Zones (WRZs) and Enviroment Agency (EA) Water Bodies. It also uses the following datasets:

  • WRZ Water Deficit Designations (High/Medium/Low)
  • EA Water Stress Designations by Water Body (Seriously Water Stressed / Not Seriously Water Stressed)
  • EA Abstraction Reliability
  • NRW Abstraction Reliability.

Postal Sectors are coloured based on their WRZ Water Deficit Designation (Red = High, Amber = Medium, Green = Low).

By clicking on to a postal sector, users can view the WRZ water deficit designation, EA Water Stress Designation and EA/Natural Resource Wales (NRW) ‘percentage of time additional water may be available for consumptive abstraction’.

For the purposes of this map, the postal sector’s WRZ and EA water body region is the one that the centre point of the postal sector is located within.


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.

Postal Boundaries © GeoLytix copyright and database right 2012 Contains Ordnance Survey data © Crown copyright and database right 2012 Contains Royal Mail data © Royal Mail copyright and database right 2012 Contains National Statistics data © Crown copyright and database right 2012. GIS vector data. This dataset was first accessioned in the EDINA ShareGeo Open repository on 2014-03-14 and migrated to Edinburgh DataShare on 2017-02-22.

Related pages

RWG Water Efficiency Sub-group

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