Full list of latest reservoir levels across England

Reservoir levels in north-east and north-west England are at their lowest on record for this time of year, with some sites at only half their average long-term storage, new figures show.

Haweswater and Thirlmere in Cumbria are at 49% of their typical capacity due to a combination of dry weather and planned maintenance, while the Pennines group of reservoirs is down to 48%.

The Dee system in north Wales, which supplies many areas of the North West of England, has been affected by a lack of rainfall and a planned lowering of water for safety reasons, leaving it at 75% of capacity – a level classed by the Environment Agency as “exceptionally low”.

Storage across England as a whole stood at 77% at the end of May, down from 84% at the end of April and the lowest on record for the time of year – though some sites have reported normal or above normal levels.

Here is a full list of reservoir storage at the end of May 2025.

The figures have been published by the Environment Agency and show the current level as a proportion of the long-term average.

– Exceptionally low
Blagdon (Somerset): 73%
Blithfield (Staffordshire): 72%
Dee System (North Wales): 75%
Derwent Valley (Derbyshire): 65%
Haweswater & Thirlmere (Cumbria): 49%
Pennines Group 48%
Yorkshire Supply Group: 62%

– Notably low
Elan Valley Group (Powys): 68%
Kielder (Northumberland): 81%
Teesdale Group (County Durham): 69%

– Below normal
Ardingly (West Sussex): 88%
Bough Beech (Kent): 84%
Carsington & Ogston (Derbyshire): 86%
Chew Valley (Somerset): 82%
Clatworthy (Somerset): 79%
Clywedog (Powys): 93%
Colliford (Cornwall): 79%
Dove Group (Derbyshire): 92%
Grafham (Cambridgeshire): 91%
Rutland (Rutland): 89%
Wimbleball (Somerset): 82%

– Normal
Abberton (Essex): 93%
Bewl (Kent/East Sussex): 82%
Draycote (Warwickshire): 92%
Hanningfield (Essex): 92%
Lower Lee Group (north London): 93%
Lower Thames Group (Berkshire/west London): 94%
Roadford (Devon): 90%
Vyrnwy (Powys): 87%

– Above normal
Stithians (Cornwall) 94%

– Notably high
Farmoor (Oxfordshire): 99%