List of reservoirs in England and Wales by volume
The following page lists the largest reservoirs by volume in England and Wales.
| Rank | Name | Owner | Location | Year Built | Nominal volume m³ | Surface area m² | |
| 1 | Kielder Water | Northumbrian Water | Northumberland | 1981 | 199,000,000 | 10,860,000 | |
| 2 | Rutland Water | Anglian Water | Rutland | 1976 | 124,000,000 | 12,600,000 | |
| 3 | Haweswater | United Utilities | Cumbria | 1935 | 84,840,000 | 3,900,000 | |
| 4 | Llyn Celyn | Welsh Water | Gwynedd | 1965 | 80,930,850 | 3,300,000 | |
| 5 | Llyn Brianne | Welsh Water | Powys | 1972 | 64,400,000 | 2,096,000 | |
| 6 | Llyn Brenig | Welsh Water | Denbighshire | 1976 | 61,500,000 | 3,725,000 | |
| 7 | Lake Vyrnwy | Severn Trent Water | Powys | 1888 | 59,700,000 | 4,536,000 | |
| 8 | Grafham Water | Anglian Water | Cambridgeshire | 1965 | 57,800,000 | 6,280,000 | |
| 9 | Llyn Clywedog | Severn Trent Water | Powys | 1967 | 49,940,000 | 2,490,000 | |
| 10 | Cow Green Reservoir | Northumbrian Water | Teesdale | 1971 | 40,914,000 | 3,120,000 | |
| 11 | Thirlmere | United Utilities | Cumbria | 1894 | 40,714,999 | 3,290,000 | |
| 12 | Claerwen | Welsh Water | Powys | 1952 | 40,307,000 | 2,630,000 | |
| 13 | Derwent Reservoir | Northumbrian Water | County Durham | 1965 | 40,060,000 | 405,000 | |
| 14 | Roadford Lake | South West Water | Devon | 1989 | 36,910,000 | 2,987,000 | |
| 15 | Caban Coch | Welsh Water | Powys | 1904 | 35,531,000 | 2,023,000 | |
| 16 | Llyn Trawsfynydd | Magnox Ltd | Gwynedd | 1928 | 33,190,000 | 4,800,000 | |
| 17 | Nant y Moch | Statkraft | Ceredigion | 1964 | 32,564,000 | 2,630,000 | |
| 18 | Queen Mother Reservoir | Thames Water | Greater London | 1976 | 31,492,000 | 1,922,000 | |
| 19 | Bewl Water | Southern Water | Kent | 1975 | 31,000,000 | 3,120,000 | |
| 20 | Queen Mary Reservoir | Thames Water | Greater London | 1931 | 30,363,000 | 2,863,000 | |
| 21 | Colliford Lake | South West Water | Cornwall | 1983 | 29,100,000 | 3,660,000 | |
| 22 | Ladybower Reservoir | Severn Trent Water | Derbyshire | 1943 | 27,800,000 | 2,100,000 | |
| 23 | Hanningfield Reservoir | Essex and Suffolk Water | Essex | 1957 | 27,721,000 | 3,536,000 | |
| 24 | Wraysbury Reservoir | Thames Water | Greater London | 1970 | 26,910,000 | 2,023,000 | |
| 25 | Abberton Reservoir | Essex and Suffolk Water | Essex | 1939 | 25,721,000 | 4,900,000 | |
| 26 | Llandegfedd Reservoir | Welsh Water | Monmouthshire | 1965 | 24,660,000 | 1,760,445 | |
| 27 | Draycote Water | Severn Trent Water | Warwickshire | 1969 | 22,730,000 | 2,430,000 | |
| 28 | Grimwith Reservoir | Yorkshire Water | North Yorkshire | 1983 | 22,200,000 | 1,500,000 | |
| 29 | Wimbleball Lake | South West Water | Somerset | 1979 | 21,541,000 | 1,620,000 | |
| 30 | Chew Valley Lake | Bristol Water | Somerset | 1956 | 20,457,000 | 4,856,000 | |
| 31 | Balderhead Reservoir | Northumbrian Water | County Durham | 1961 | 19,618,000 | 1,170,000 | |
| 32 | King George VI Reservoir | Thames Water | Greater London | 1947 | 18,732,000 | 1,420,000 | |
| 33 | Blithfield Reservoir | South Staffordshire Water | Staffordshire | 1953 | 18,172,000 | 3,190,000 | |
| 34 | Pitsford Water | Anglian Water | Northamptonshire | 1956 | 17,545,000 | 3,030,000 | |
| 35 | Queen Elizabeth II Reservoir | Thames Water | Greater London | 1962 | 16,809,000 | 1,283,000 | |
| 36 | William Girling Reservoir | Thames Water | Greater London | 1951 | 16,500,000 | 1,350,000 | |
| 37 | Pontsticill Reservoir | Welsh Water | Powys | 1927 | 15,640,000 | 1,412,000 | |
| 38 | Selset Reservoir | Northumbrian Water | County Durham | 1960 | 15,320,000 | 1,110,000 | |
| 39 | Alwen Reservoir | Welsh Water | Conwy | 1921 | 14,564,200 | 1,490,000 | |
| 40 | King George V Reservoir | Thames Water | Greater London | 1912 | 13,970,000 | 1,720,000 | |
| 41 | Foremark Reservoir | Severn Trent Water | Derbyshire | 1977 | 13,193,486 | 930,000 | |
| 42 | Usk Reservoir | Welsh Water | Powys | 1955 | 12,253,000 | 1,160,000 | |
| 43 | Stocks Reservoir | United Utilities | Lancashire | 1932 | 12,006,000 | 1,390,000 | |
| 44 | Talybont Reservoir | Welsh Water | Powys | 1939 | 11,668,000 | 1,272,000 | |
| 45 | Covenham Reservoir | Anglian Water | Lincolnshire | 1972 | 10,900,000 | 882,000 | |
| 46 | Catcleugh Reservoir | Northumbrian Water | Northumberland | 1905 | 10,480,000 | 107,000 | |
| 47 | Scar House Reservoir | Yorkshire Water | North Yorkshire | 1936 | 10,069,000 | 700,000 |