# List of reservoirs in the United Kingdom

The following page lists the reservoirs in the United Kingdom.

## Reservoirs accounting for 90% storage

This list contains 273 individual reservoirs, which amount to approximately 90% of total reservoir storage in the United Kingdom, sourced from the Environmental Information Data Centre.
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| Rank | Name | Country | County | Grid Ref. Location | Maximum volume m$^3$ | Planning date | Completion date |
| 26 | Abberton | England | Essex | TL9810018300 51°49′41″N 0°52′24″E﻿ / ﻿51.828181°N 0.873431°E﻿ / 51.828181; 0.873431﻿ (Abberton Reservoir) | 39,000,000 | 1935 | 1939 |
| 175 | Agden | England | South Yorkshire | SK2610092300 53°25′37″N 1°36′31″W﻿ / ﻿53.426850°N 1.6086803°W﻿ / 53.426850; -1.6086803﻿ (Agden Reservoir) | 2,859,000 | 1864 | 1869 |
| 152 | Allerton Newton Fairburn | England | West Yorkshire | SE4500027200 53°44′21″N 1°19′09″W﻿ / ﻿53.739250°N 1.3192470°W﻿ / 53.739250; -1.3192470﻿ (Allerton Newton Fairburn) | 3,347,500 | NA | NA |
| 229 | Allt na Lairige | Scotland | Argyll and Bute | NN2530017400 56°19′00″N 4°49′34″W﻿ / ﻿56.316700°N 4.8262144°W﻿ / 56.316700; -4.8262144﻿ (Allt na Lairige) | 1,838,000 | 1943 | 1956 |
| 83 | Alton Water | England | Suffolk | TM1620035700 51°58′40″N 1°08′48″E﻿ / ﻿51.977682°N 1.1465962°E﻿ / 51.977682; 1.1465962﻿ (Alton Water) | 9,100,000 | 1974 | 1986 |
| 60 | Alwen Reservoir | Wales | Conwy | SH9550053000 53°03′50″N 3°33′39″W﻿ / ﻿53.063990°N 3.5609018°W﻿ / 53.063990; -3.5609018﻿ (Alwen Reservoir) | 14,754,000 | 1909 | 1921 |
| 135 | Anglezarke | England | Lancashire | SD6170016000 53°38′21″N 2°34′51″W﻿ / ﻿53.639105°N 2.5807524°W﻿ / 53.639105; -2.5807524﻿ (Anglezarke Reservoir) | 4,044,000 | 1850 | 1857 |
| 129 | Angram | England | North Yorkshire | SE0400076000 54°10′47″N 1°56′25″W﻿ / ﻿54.179767°N 1.9402122°W﻿ / 54.179767; -1.9402122﻿ (Angram Reservoir) | 4,737,000 | 1904 | 1918 |
| 119 | Ardingly | England | West Sussex | TQ3350028800 51°02′35″N 0°05′49″W﻿ / ﻿51.043051°N 0.097062417°W﻿ / 51.043051; -0.097062417﻿ (Ardingly Reservoir) | 5,206,000 | 1974 | 1979 |
| 210 | Ardleigh | England | Essex | TM0340028200 51°54′55″N 0°57′22″E﻿ / ﻿51.915170°N 0.95606328°E﻿ / 51.915170; 0.95606328﻿ (Ardleigh Reservoir) | 2,109,000 | 1964 | 1979 |
| 143 | Arlington | England | East Sussex | TQ5335207419 50°50′46″N 0°10′37″E﻿ / ﻿50.845975°N 0.17691709°E﻿ / 50.845975; 0.17691709﻿ (Arlington Reservoir) | 3,545,800 | 1969 | 1971 |
| 185 | Audenshaw No.1 | England | Greater Manchester | SJ9170096700 53°28′01″N 2°07′35″W﻿ / ﻿53.466973°N 2.1264940°W﻿ / 53.466973; -2.1264940﻿ (Audenshaw No.1) | 2,590,000 | 1875 | 1882 |
| 234 | Audenshaw No.2 | England | Greater Manchester | SJ9140096200 53°27′45″N 2°07′52″W﻿ / ﻿53.462474°N 2.1309991°W﻿ / 53.462474; -2.1309991﻿ (Audenshaw No.2) | 1,745,000 | 1875 | 1882 |
| 183 | Audenshaw No.3 | England | Greater Manchester | SJ9110096700 53°28′01″N 2°08′08″W﻿ / ﻿53.466963°N 2.1355320°W﻿ / 53.466963; -2.1355320﻿ (Audenshaw No.3) | 2,680,000 | 1877 | 1882 |
| 201 | Baddinsgill | Scotland | Scottish Borders | NT1286455787 55°47′15″N 3°23′28″W﻿ / ﻿55.787507°N 3.3910944°W﻿ / 55.787507; -3.3910944﻿ (Baddinsgill Reservoir) | 2,250,000 | 1926 | 1828 |
| 144 | Baitings | England | West Yorkshire | SE0100018900 53°40′00″N 1°59′11″W﻿ / ﻿53.666580°N 1.9863413°W﻿ / 53.666580; -1.9863413﻿ (Baitings Reservoir) | 3,523,000 | 1929 | 1956 |
| 168 | Bakethin | England | Northumberland | NY6430091300 55°12′53″N 2°33′45″W﻿ / ﻿55.214639°N 2.5626151°W﻿ / 55.214639; -2.5626151﻿ (Bakethin Reservoir) | 2,960,000 | 1971 | 1981 |
| 50 | Balderhead | England | County Durham | NY9280018400 54°33′39″N 2°06′46″W﻿ / ﻿54.560782°N 2.1128527°W﻿ / 54.560782; -2.1128527﻿ (Balderhead Reservoir) | 19,618,000 | 1959 | 1965 |
| 178 | Banbury | England | Greater London | TQ3620091400 51°36′18″N 0°02′05″W﻿ / ﻿51.604974°N 0.034668699°W﻿ / 51.604974; -0.034668699﻿ (Banbury Reservoir) | 2,779,000 | 1897 | 1903 |
| 166 | Banbury FSA | England | Greater London | TQ3620091400 51°36′18″N 0°02′05″W﻿ / ﻿51.604974°N 0.034668699°W﻿ / 51.604974; -0.034668699﻿ (Banbury FSA) | 3,040,000 | 2001 | 2012 |
| 202 | Barden Lower | England | North Yorkshire | SE0350056700 54°00′23″N 1°56′53″W﻿ / ﻿54.006312°N 1.9480887°W﻿ / 54.006312; -1.9480887﻿ (Barden Lower Reservoir) | 2,240,000 | 1854 | 1873 |
| 209 | Barden Upper | England | North Yorkshire | SE0120057800 54°00′58″N 1°58′59″W﻿ / ﻿54.016208°N 1.9831770°W﻿ / 54.016208; -1.9831770﻿ (Barden Upper Reservoir) | 2,112,000 | 1854 | 1873 |
| 261 | Barnacre North | England | Lancashire | SD5260047800 53°55′27″N 2°43′24″W﻿ / ﻿53.924153°N 2.7232767°W﻿ / 53.924153; -2.7232767﻿ (Barnacre North) | 344,000 | 1861 | 1878 |
| 264 | Barnacre South | England | Lancashire | SD5260047600 53°55′20″N 2°43′24″W﻿ / ﻿53.922355°N 2.7232456°W﻿ / 53.922355; -2.7232456﻿ (Barnacre South) | 248,000 | 1861 | 1878 |
| 268 | Barrow 1 | England | Somerset | ST5360067200 51°24′07″N 2°40′06″W﻿ / ﻿51.401921°N 2.6684067°W﻿ / 51.401921; -2.6684067﻿ (Barrow 1) | 157,000 | 1846 | 1850 |
| 265 | Barrow 2 | England | Somerset | ST5390067500 51°24′17″N 2°39′51″W﻿ / ﻿51.404643°N 2.6641335°W﻿ / 51.404643; -2.6641335﻿ (Barrow 2) | 245,000 | 1846 | 1850 |
| 208 | Barrow 3 | England | Somerset | ST5430068000 51°24′33″N 2°39′30″W﻿ / ﻿51.409171°N 2.6584480°W﻿ / 51.409171; -2.6584480﻿ (Barrow 3) | 2,160,000 | 1846 | 1850 |
| 191 | Bartley | England | West Midlands County | SP0020081200 52°25′44″N 1°59′55″W﻿ / ﻿52.428782°N 1.9984853°W﻿ / 52.428782; -1.9984853﻿ (Bartley Reservoir) | 2,400,000 | 1925 | 1930 |
| 267 | Beacons Reservoir | Wales | Powys | SN9870018580 51°51′24″N 3°28′20″W﻿ / ﻿51.856583°N 3.4722935°W﻿ / 51.856583; -3.4722935﻿ (Beacons Reservoir) | 160,000 | 1883 | 1897 |
| 96 | Beckingham FSA | England | Nottinghamshire | SK7950090500 53°24′19″N 0°48′20″W﻿ / ﻿53.405341°N 0.80563022°W﻿ / 53.405341; -0.80563022﻿ (Beckingham FSA) | 7,000,000 | 1960 | 1960 |
| 224 | Belmont | England | Blackburn with Darwen | SD6730016400 53°38′35″N 2°29′46″W﻿ / ﻿53.643081°N 2.4960998°W﻿ / 53.643081; -2.4960998﻿ (Belmont Reservoir) | 1,886,000 | 1824 | 1826 |
| 206 | Belvide | England | Staffordshire | SJ8650010200 52°41′22″N 2°12′04″W﻿ / ﻿52.689316°N 2.2011613°W﻿ / 52.689316; -2.2011613﻿ (Belvide Reservoir) | 2,196,000 | 1825 | 1833 |
| 239 | Ben Crom | Northern Ireland | County Down | SB4015582002 54°10′04″N 5°58′57″W﻿ / ﻿54.167845°N 5.9825162°W﻿ / 54.167845; -5.9825162﻿ (Ben Crom Reservoir) | 1,700,000 | 1945 | 1957 |
| 32 | Bewl Bridge | England | East Sussex | TQ6776832663 51°04′08″N 0°23′35″E﻿ / ﻿51.068782°N 0.39313386°E﻿ / 51.068782; 0.39313386﻿ (Bewl Bridge Reservoir) | 31,400,000 | 1967 | 1975 |
| 195 | Blackbrook | England | Leicestershire | SK4580017500 52°45′11″N 1°19′22″W﻿ / ﻿52.753180°N 1.3228607°W﻿ / 52.753180; -1.3228607﻿ (Blackbrook Reservoir) | 2,300,000 | 1901 | 1906 |
| 160 | Blackmoorfoot | England | West Yorkshire | SE0990013000 53°36′48″N 1°51′07″W﻿ / ﻿53.613459°N 1.8518301°W﻿ / 53.613459; -1.8518301﻿ (Blackmoorfoot) | 3,205,000 | 1869 | 1876 |
| 212 | Blackton | England | County Durham | NY9440018600 54°33′45″N 2°05′17″W﻿ / ﻿54.562600°N 2.0881146°W﻿ / 54.562600; -2.0881146﻿ (Blackton Reservoir) | 2,105,000 | 1876 | 1896 |
| 5 | Blackwater | Scotland | Highland | NN2475160292 56°42′05″N 4°51′50″W﻿ / ﻿56.701359°N 4.8639740°W﻿ / 56.701359; -4.8639740﻿ (Blackwater Reservoir) | 214,977,000 | 1904 | 1909 |
| 88 | Blagdon (Bristol) | England | Somerset | ST5100060000 51°20′13″N 2°42′17″W﻿ / ﻿51.336967°N 2.7047849°W﻿ / 51.336967; -2.7047849﻿ (Blagdon Lake) | 8,260,000 | 1888 | 1904 |
| 52 | Blithfield | England | Staffordshire | SK0600023500 52°48′32″N 1°54′45″W﻿ / ﻿52.809016°N 1.9124313°W﻿ / 52.809016; -1.9124313﻿ (Blithfield Reservoir) | 18,200,000 | 1892 | 1953 |
| 248 | Bosley | England | Cheshire | SJ9220065900 53°11′24″N 2°07′05″W﻿ / ﻿53.190130°N 2.1181929°W﻿ / 53.190130; -2.1181929﻿ (Bosley Reservoir) | 1,224,000 | 1826 | 1931 |
| 196 | Bottoms (Longdendale) | England | Derbyshire | SK0230097000 53°28′11″N 1°58′01″W﻿ / ﻿53.469732°N 1.9668196°W﻿ / 53.469732; -1.9668196﻿ (Bottoms Reservoir (Derbyshire)) | 2,300,000 | 1848 | 1877 |
| 78 | Bough Beech | England | Kent | TQ4940047700 51°12′32″N 0°08′15″E﻿ / ﻿51.208972°N 0.13741063°E﻿ / 51.208972; 0.13741063﻿ (Bough Beech Reservoir) | 10,018,000 | 1965 | 1968 |
| 220 | Branston Island | England | Lincolnshire | TF1000071000 53°13′29″N 0°21′14″W﻿ / ﻿53.224667°N 0.35378615°W﻿ / 53.224667; -0.35378615﻿ (Branston Island) | 2,000,000 | NA | NA |
| 246 | Brent | England | Greater London | TQ2160087100 51°34′11″N 0°14′49″W﻿ / ﻿51.569668°N 0.24686808°W﻿ / 51.569668; -0.24686808﻿ (Brent Reservoir) | 1,632,330 | 1819 | 1835 |
| 126 | Broomhead | England | South Yorkshire | SK2690095900 53°27′33″N 1°35′47″W﻿ / ﻿53.459168°N 1.5963348°W﻿ / 53.459168; -1.5963348﻿ (Broomhead Reservoir) | 4,937,282 | 1867 | 1929 |
| 69 | Brotherton Little Marsh to Birkin Holme Washland | England | North Yorkshire | SE5210025300 53°43′17″N 1°12′43″W﻿ / ﻿53.721515°N 1.2119357°W﻿ / 53.721515; -1.2119357﻿ (Brotherton Little Marsh to Birkin Holme Washland) | 11,320,000 | NA | NA |
| 102 | Burnhope | England | County Durham | NY8470039000 54°44′45″N 2°14′21″W﻿ / ﻿54.745724°N 2.2391942°W﻿ / 54.745724; -2.2391942﻿ (Burnhope Reservoir) | 6,438,182 | 1931 | 1937 |
| 132 | Burrator | England | Devon | SX5568768562 50°29′57″N 4°02′10″W﻿ / ﻿50.499032°N 4.0361770°W﻿ / 50.499032; -4.0361770﻿ (Burrator Reservoir) | 4,464,000 | 1891 | 1898 |
| 232 | Butterley | England | West Yorkshire | SE0470010500 53°35′28″N 1°55′50″W﻿ / ﻿53.591059°N 1.9304674°W﻿ / 53.591059; -1.9304674﻿ (Butterley Reservoir (Derbyshire)) | 1,773,000 | 1789 | 1794 |
| 28 | Caban Coch | Wales | Powys | SN9160063200 52°15′23″N 3°35′22″W﻿ / ﻿52.256256°N 3.5895197°W﻿ / 52.256256; -3.5895197﻿ (Caban Coch) | 36,865,000 | 1892 | 1904 |
| 218 | Caldecott Lake | England | Buckinghamshire | SP8990035800 52°00′48″N 0°41′29″W﻿ / ﻿52.013356°N 0.69150143°W﻿ / 52.013356; -0.69150143﻿ (Caldecott Lake) | 2,014,000 | 1967 | 1972 |
| 269 | Cantref Reservoir | Wales | Powys | SN9938015840 51°49′55″N 3°27′42″W﻿ / ﻿51.832079°N 3.4616252°W﻿ / 51.832079; -3.4616252﻿ (Cantref Reservoir) | 145,000 | 1884 | 1892 |
| 29 | Carsington | England | Derbyshire | SK2480051400 53°03′33″N 1°37′53″W﻿ / ﻿53.059279°N 1.6314139°W﻿ / 53.059279; -1.6314139﻿ (Carsington Water) | 36,000,000 | 1973 | 1992 |
| 75 | Catcleugh | England | Northumberland | NT7470003100 55°19′17″N 2°24′01″W﻿ / ﻿55.321313°N 2.4002361°W﻿ / 55.321313; -2.4002361﻿ (Catcleugh Reservoir) | 10,500,000 | 1888 | 1905 |
| 240 | Catterall Flood Storage | England | Lancashire | SD4680041300 53°51′55″N 2°48′38″W﻿ / ﻿53.865173°N 2.8104563°W﻿ / 53.865173; -2.8104563﻿ (Catterall Flood Storage) | 1,700,000 | NA | 1982 |
| 214 | Cavendish Dock | England | Cumbria | SD2120068300 54°06′16″N 3°12′24″W﻿ / ﻿54.104527°N 3.2066514°W﻿ / 54.104527; -3.2066514﻿ (Cavendish Dock) | 2,053,000 | 1863 | 1879 |
| 63 | Cawood Ings Wistow Lordship | England | North Yorkshire | SE6050036000 53°49′00″N 1°04′57″W﻿ / ﻿53.816769°N 1.0825621°W﻿ / 53.816769; -1.0825621﻿ (Cawood Ings Wistow Lordship) | 13,500,000 | NA | NA |
| 142 | Chasewater | England | Staffordshire | SK0360007600 52°39′58″N 1°56′54″W﻿ / ﻿52.666103°N 1.9482042°W﻿ / 52.666103; -1.9482042﻿ (Chasewater) | 3,691,000 | 1794 | 1797 |
| 108 | Cheddar | England | Somerset | ST4410053700 51°16′47″N 2°48′10″W﻿ / ﻿51.279686°N 2.8028357°W﻿ / 51.279686; -2.8028357﻿ (Cheddar Reservoir) | 6,140,000 | 1933 | 1938 |
| 270 | Chelker | England | North Yorkshire | SE0564051600 53°57′38″N 1°54′56″W﻿ / ﻿53.960456°N 1.9155302°W﻿ / 53.960456; -1.9155302﻿ (Chelker Reservoir) | 95,000 | NA | 1866 |
| 164 | Chelmarsh | England | Shropshire | SO7340087500 52°29′05″N 2°23′35″W﻿ / ﻿52.484765°N 2.3931329°W﻿ / 52.484765; -2.3931329﻿ (Chelmarsh Reservoir) | 3,063,320 | 1960 | 1963 |
| 273 | Chew Magna | England | Somerset | ST5660063200 51°21′58″N 2°37′29″W﻿ / ﻿51.366195°N 2.6247933°W﻿ / 51.366195; -2.6247933﻿ (Chew Magna Reservoir) | 43,000 | 1850 | 1850 |
| 47 | Chew Valley Lake | England | Somerset | ST5700060000 51°20′15″N 2°37′07″W﻿ / ﻿51.337453°N 2.6186602°W﻿ / 51.337453; -2.6186602﻿ (Chew Valley Lake) | 20,457,000 | 1939 | 1956 |
| 111 | Chrathaich | Scotland | Highland | NH3640020700 57°14′52″N 4°42′47″W﻿ / ﻿57.247645°N 4.7131125°W﻿ / 57.247645; -4.7131125﻿ (Chrathaich Reservoir) | 5,629,000 | 1928 | 1955 |
| 177 | Church Wilne | England | Derbyshire | SK4630032500 52°53′17″N 1°18′48″W﻿ / ﻿52.887970°N 1.3133319°W﻿ / 52.887970; -1.3133319﻿ (Church Wilne Reservoir) | 2,790,000 | NA | 1972 |
| 22 | Claerwen | Wales | Powys | SN8550065100 52°16′20″N 3°40′46″W﻿ / ﻿52.272093°N 3.6794917°W﻿ / 52.272093; -3.6794917﻿ (Claerwen Reservoir) | 48,686,000 | 1892 | 1952 |
| 116 | Clatworthy | England | Somerset | ST0430031400 51°04′26″N 3°22′03″W﻿ / ﻿51.073920°N 3.3673742°W﻿ / 51.073920; -3.3673742﻿ (Clatworthy Reservoir) | 5,364,000 | 1950 | 1958 |
| 197 | Clifton Ings Washlands | England | North Yorkshire | SE5870053100 53°58′14″N 1°06′24″W﻿ / ﻿53.970648°N 1.1066274°W﻿ / 53.970648; -1.1066274﻿ (Clifton Ings Washlands) | 2,300,000 | NA | NA |
| 34 | Colliford Lake | England | Cornwall | SX1790071000 50°30′37″N 4°34′11″W﻿ / ﻿50.510401°N 4.5696538°W﻿ / 50.510401; -4.5696538﻿ (Colliford Lake) | 29,100,000 | 1976 | 1983 |
| 127 | Colt Crag | England | Northumberland | NY9400078100 55°05′50″N 2°05′44″W﻿ / ﻿55.097285°N 2.0955583°W﻿ / 55.097285; -2.0955583﻿ (Colt Crag Reservoir) | 4,855,000 | 1863 | 1884 |
| 73 | Covenham | England | Lincolnshire | TF3463596017 53°26′37″N 0°01′32″E﻿ / ﻿53.443731°N 0.025611218°E﻿ / 53.443731; 0.025611218﻿ (Covenham Reservoir) | 10,900,000 | 1963 | 1978 |
| 24 | Cow Green | England | Durham | NY8120028900 54°39′17″N 2°17′34″W﻿ / ﻿54.654841°N 2.2929079°W﻿ / 54.654841; -2.2929079﻿ (Cow Green Reservoir) | 40,914,000 | 1958 | 1970 |
| 79 | Craig Goch | Wales | Powys | SN8960069800 52°18′55″N 3°37′15″W﻿ / ﻿52.315169°N 3.6209719°W﻿ / 52.315169; -3.6209719﻿ (Craig Goch Reservoir) | 9,583,000 | 1892 | 1904 |
| 136 | Cray | Wales | Powys | SN8850022000 51°53′07″N 3°37′17″W﻿ / ﻿51.885373°N 3.6214431°W﻿ / 51.885373; -3.6214431﻿ (Cray Reservoir) | 4,027,000 | 1898 | 1906 |
| 186 | Cropston | England | Leicestershire | SK5470011000 52°41′38″N 1°11′32″W﻿ / ﻿52.693928°N 1.1920904°W﻿ / 52.693928; -1.1920904﻿ (Cropston Reservoir) | 2,528,000 | 1865 | 1870 |
| 48 | Crowlands Cowbit Washes | England | Lincolnshire | TF2600016500 52°43′53″N 0°08′08″W﻿ / ﻿52.731468°N 0.13545822°W﻿ / 52.731468; -0.13545822﻿ (Crowlands Cowbit Washes) | 20,000,000 | NA | NA |
| 147 | Crummock Water | England | Cumbria | NY1510020800 54°34′31″N 3°18′54″W﻿ / ﻿54.575257°N 3.3148907°W﻿ / 54.575257; -3.3148907﻿ (Crummock Water) | 3,400,000 | NA | NA |
| 70 | Curry Moor Flood Storage Area | England | Somerset | ST3260027000 51°02′18″N 2°57′46″W﻿ / ﻿51.038387°N 2.9626802°W﻿ / 51.038387; -2.9626802﻿ (Curry Moor Flood Storage Area) | 11,283,000 | NA | NA |
| 44 | Daer | Scotland | South Lanarkshire | NS9757507812 55°21′13″N 3°37′01″W﻿ / ﻿55.353611°N 3.6169925°W﻿ / 55.353611; -3.6169925﻿ (Daer Reservoir) | 22,494,000 | 1948 | 1956 |
| 205 | Dale Dyke | England | South Yorkshire | SK2430091700 53°25′18″N 1°38′09″W﻿ / ﻿53.421543°N 1.6358144°W﻿ / 53.421543; -1.6358144﻿ (Dale Dyke Reservoir) | 2,210,000 | 1853 | 1875 |
| 118 | Damflask | England | South Yorkshire | SK2840090700 53°24′44″N 1°34′27″W﻿ / ﻿53.412351°N 1.5742116°W﻿ / 53.412351; -1.5742116﻿ (Damflask Reservoir) | 5,264,000 | 1864 | 1867 |
| 130 | Darwell | England | East Sussex | TQ7150021200 50°57′53″N 0°26′27″E﻿ / ﻿50.964696°N 0.44093306°E﻿ / 50.964696; 0.44093306﻿ (Darwell Reservoir) | 4,730,000 | 1937 | 1949 |
| 194 | Delph | England | Greater Manchester | SD7030015400 53°38′03″N 2°27′02″W﻿ / ﻿53.634273°N 2.4506272°W﻿ / 53.634273; -2.4506272﻿ (Delph Reservoir) | 2,326,700 | 1905 | 1921 |
| 80 | Derwent | England | Derbyshire | SK1730089800 53°24′17″N 1°44′28″W﻿ / ﻿53.404740°N 1.7412482°W﻿ / 53.404740; -1.7412482﻿ (Derwent Reservoir (Derbyshire)) | 9,470,000 | 1899 | 1916 |
| 19 | Derwent Reservoir | England | County Durham | NZ0250051400 54°51′27″N 1°57′45″W﻿ / ﻿54.857386°N 1.9625840°W﻿ / 54.857386; -1.9625840﻿ (Derwent Reservoir (Durham)) | 50,060,000 | 1950 | 1966 |
| 157 | Digley | England | West Yorkshire | SE1100007000 53°33′34″N 1°50′07″W﻿ / ﻿53.559507°N 1.8354124°W﻿ / 53.559507; -1.8354124﻿ (Digley Reservoir) | 3,260,000 | 1937 | 1954 |
| 258 | Doe Park | England | West Yorkshire | SE0780034200 53°48′15″N 1°52′59″W﻿ / ﻿53.804041°N 1.8830465°W﻿ / 53.804041; -1.8830465﻿ (Doe Park Reservoir) | 422,000 | 1857 | 1862 |
| 266 | Donolly Reservoir | Scotland | East Lothian | NT5780068700 55°54′34″N 2°40′36″W﻿ / ﻿55.909541°N 2.6766156°W﻿ / 55.909541; -2.6766156﻿ (Donolly Reservoir) | 209,000 | NA | NA |
| 123 | Dovestone | England | Greater Manchester | SE0160003600 53°31′45″N 1°58′38″W﻿ / ﻿53.529058°N 1.9773335°W﻿ / 53.529058; -1.9773335﻿ (Dovestone Reservoir) | 5,048,000 | 1958 | 1966 |
| 43 | Draycote Water | England | Warwickshire | SP4600070000 52°19′34″N 1°19′35″W﻿ / ﻿52.326175°N 1.3264618°W﻿ / 52.326175; -1.3264618﻿ (Draycote Water) | 22,730,000 | 1965 | 1969 |
| 42 | East Ings and Wood Holmes Washland Reservoir | England | North Yorkshire | SE5230024300 53°42′45″N 1°12′33″W﻿ / ﻿53.712507°N 1.2090737°W﻿ / 53.712507; -1.2090737﻿ (East Ings and Wood Holmes Washland Reservoir) | 23,700,000 | NA | NA |
| 251 | East Warwick | England | Greater London | TQ3480088500 51°34′45″N 0°03′22″W﻿ / ﻿51.579250°N 0.055985047°W﻿ / 51.579250; -0.055985047﻿ (East Warwick Reservoir) | 742,000 | 1853 | 1900 |
| 103 | Eccup | England | West Yorkshire | SE3080041800 53°52′17″N 1°31′59″W﻿ / ﻿53.871498°N 1.5330645°W﻿ / 53.871498; -1.5330645﻿ (Eccup Reservoir) | 6,410,000 | 1885 | 1897 |
| 153 | Eglwys Nunydd | Wales | Neath Port Talbot | SS7920085500 51°33′19″N 3°44′38″W﻿ / ﻿51.555411°N 3.7438321°W﻿ / 51.555411; -3.7438321﻿ (Eglwys Nunydd Reservoir) | 3,311,000 | 1957 | 1963 |
| 148 | Ennerdale Water | England | Cumbria | NY0890015300 54°31′29″N 3°24′33″W﻿ / ﻿54.524765°N 3.4090669°W﻿ / 54.524765; -3.4090669﻿ (Ennerdale Water) | 3,400,000 | 1902 | 1902 |
| 145 | Entwistle | England | Blackburn with Darwen | SD7200017500 53°39′12″N 2°25′30″W﻿ / ﻿53.653241°N 2.4251088°W﻿ / 53.653241; -2.4251088﻿ (Entwistle Reservoir) | 3,464,000 | 1832 | 1838 |
| 134 | Errwood | England | Derbyshire | SK0140075200 53°16′26″N 1°58′50″W﻿ / ﻿53.273783°N 1.9804662°W﻿ / 53.273783; -1.9804662﻿ (Errwood Reservoir) | 4,216,000 | 1930 | 1967 |
| 90 | Eyebrook | England | Leicestershire | SP8480094700 52°32′37″N 0°45′04″W﻿ / ﻿52.543560°N 0.75099918°W﻿ / 52.543560; -0.75099918﻿ (Eyebrook Reservoir) | 8,096,000 | 1937 | 1940 |
| 187 | Farmoor No. 1 | England | Oxfordshire | SP4450006800 51°45′29″N 1°21′24″W﻿ / ﻿51.758126°N 1.3566759°W﻿ / 51.758126; -1.3566759﻿ (Farmoor No. 1 Reservoir) | 2,505,000 | 1962 | 1967 |
| 122 | Farmoor No. 2 | England | Oxfordshire | SP4450006000 51°45′03″N 1°21′24″W﻿ / ﻿51.750934°N 1.3567780°W﻿ / 51.750934; -1.3567780﻿ (Farmoor No. 2 Reservoir) | 5,055,000 | 1962 | 1977 |
| 125 | Fernilee | England | Derbyshire | SK0130077700 53°17′47″N 1°58′55″W﻿ / ﻿53.296255°N 1.9819564°W﻿ / 53.296255; -1.9819564﻿ (Fernilee Reservoir) | 4,944,000 | 1930 | 1938 |
| 237 | Fernworthy | England | Devon | SX6710084300 50°38′35″N 3°52′52″W﻿ / ﻿50.643190°N 3.8809759°W﻿ / 50.643190; -3.8809759﻿ (Fernworthy Reservoir) | 1,727,300 | 1934 | 1942 |
| 141 | Fewston | England | North Yorkshire | SE1870054100 53°58′57″N 1°42′59″W﻿ / ﻿53.982621°N 1.7163354°W﻿ / 53.982621; -1.7163354﻿ (Fewston Reservoir) | 3,845,000 | 1874 | 1879 |
| 231 | Ffynnon Llugwy | Wales | Conwy | SH6920062400 53°08′34″N 3°57′25″W﻿ / ﻿53.142643°N 3.9569822°W﻿ / 53.142643; -3.9569822﻿ (Ffynnon Llugwy Reservoir) | 1,776,000 | 1915 | 1926 |
| 174 | Fiddler's Ferry P.S. Ash Lagoon D | England | Cheshire | SJ5520085500 53°21′52″N 2°40′29″W﻿ / ﻿53.364460°N 2.6746880°W﻿ / 53.364460; -2.6746880﻿ (Fiddler's Ferry P.S. Ash Lagoon D) | 2,900,000 | NA | NA |
| 154 | Fontburn | England | Northumberland | NZ0450093500 55°14′08″N 1°55′51″W﻿ / ﻿55.235687°N 1.9307831°W﻿ / 55.235687; -1.9307831﻿ (Fontburn Reservoir) | 3,279,000 | 1898 | 1903 |
| 64 | Foremark | England | Derbyshire | SK3290024400 52°48′58″N 1°30′48″W﻿ / ﻿52.816142°N 1.5132885°W﻿ / 52.816142; -1.5132885﻿ (Foremark Reservoir) | 13,193,490 | 1966 | 1977 |
| 76 | Fruid | Scotland | Scottish Borders | NT0968919217 55°27′30″N 3°25′47″W﻿ / ﻿55.458437°N 3.4296968°W﻿ / 55.458437; -3.4296968﻿ (Fruid Reservoir) | 10,438,000 | 1953 | 1968 |
| 82 | Garreg Ddu | Wales | Powys | SN9110063900 52°15′45″N 3°35′49″W﻿ / ﻿52.262447°N 3.5970679°W﻿ / 52.262447; -3.5970679﻿ (Garreg Ddu Reservoir) | 9,222,000 | 1892 | 1904 |
| 89 | Gladhouse | Scotland | Midlothian | NT2977853599 55°46′14″N 3°07′15″W﻿ / ﻿55.770608°N 3.1208736°W﻿ / 55.770608; -3.1208736﻿ (Gladhouse Reservoir) | 8,133,000 | NA | 1879 |
| 84 | Glen Finglas | Scotland | Stirling | NN5241009260 56°15′10″N 4°23′02″W﻿ / ﻿56.252852°N 4.3838037°W﻿ / 56.252852; -4.3838037﻿ (Glen Finglas Reservoir) | 9,043,000 | 1911 | 1965 |
| 243 | Glencorse | Scotland | Midlothian | NT2164763897 55°51′43″N 3°15′12″W﻿ / ﻿55.861862°N 3.2534157°W﻿ / 55.861862; -3.2534157﻿ (Glencorse Reservoir) | 1,673,000 | 1819 | 1824 |
| 236 | Gorple Upper | England | West Yorkshire | SD9240031400 53°46′44″N 2°07′01″W﻿ / ﻿53.778874°N 2.1168095°W﻿ / 53.778874; -2.1168095﻿ (Gorple Upper Reservoir) | 1,731,000 | 1928 | 1934 |
| 110 | Gouthwaite | England | North Yorkshire | SE1300069000 54°07′00″N 1°48′09″W﻿ / ﻿54.116708°N 1.8026204°W﻿ / 54.116708; -1.8026204﻿ (Gouthwaite Reservoir) | 5,810,789 | 1893 | 1901 |
| 17 | Grafham Water | England | Cambridgeshire | TL1700067000 52°17′19″N 0°17′10″W﻿ / ﻿52.288689°N 0.28606805°W﻿ / 52.288689; -0.28606805﻿ (Grafham Water) | 55,490,000 | 1961 | 1965 |
| 109 | Grassholme | England | County Durham | NY9380022400 54°35′48″N 2°05′51″W﻿ / ﻿54.596742°N 2.0974750°W﻿ / 54.596742; -2.0974750﻿ (Grassholme Reservoir) | 6,060,000 | 1876 | 1915 |
| 146 | Greenbooth | England | Greater Manchester | SD8530015200 53°37′59″N 2°13′26″W﻿ / ﻿53.633114°N 2.2237757°W﻿ / 53.633114; -2.2237757﻿ (Greenbooth Reservoir) | 3,405,000 | 1958 | 1962 |
| 45 | Grimwith | England | North Yorkshire | SE0600064200 54°04′25″N 1°54′35″W﻿ / ﻿54.073696°N 1.9097996°W﻿ / 54.073696; -1.9097996﻿ (Grimwith Reservoir) | 22,200,000 | 1856 | 1864 |
| 163 | Hallington East | England | Northumberland | NY9730076300 55°04′52″N 2°02′38″W﻿ / ﻿55.081140°N 2.0438290°W﻿ / 55.081140; -2.0438290﻿ (Hallington East Reservoir) | 3,116,740 | 1863 | 1872 |
| 149 | Hallington West | England | Northumberland | NY9650076000 55°04′42″N 2°03′23″W﻿ / ﻿55.078439°N 2.0563562°W﻿ / 55.078439; -2.0563562﻿ (Hallington West Reservoir) | 3,380,000 | 1876 | 1890 |
| 272 | Hampton - Sunnyside | England | Greater London | TQ1270069000 51°24′32″N 0°22′52″W﻿ / ﻿51.408835°N 0.38099829°W﻿ / 51.408835; -0.38099829﻿ (Hampton - Sunnyside Reservoir) | 71,000 | 1852 | 1855 |
| 36 | Hanningfield | England | Essex | TQ7330098400 51°39′28″N 0°30′14″E﻿ / ﻿51.657668°N 0.50402549°E﻿ / 51.657668; 0.50402549﻿ (Hanningfield Reservoir) | 27,721,000 | 1949 | 1957 |
| 13 | Haweswater | England | Cumbria | NY5000015500 54°31′56″N 2°46′27″W﻿ / ﻿54.532294°N 2.7741697°W﻿ / 54.532294; -2.7741697﻿ (Haweswater Reservoir) | 84,840,000 | 1880 | 1935 |
| 176 | Heaton Park | England | Greater Manchester | SD8250004700 53°32′19″N 2°15′56″W﻿ / ﻿53.538652°N 2.2655256°W﻿ / 53.538652; -2.2655256﻿ (Heaton Park Reservoir) | 2,800,000 | 1954 | 1955 |
| 263 | Hewenden | England | West Yorkshire | SE0740035600 53°49′00″N 1°53′21″W﻿ / ﻿53.816630°N 1.8890870°W﻿ / 53.816630; -1.8890870﻿ (Hewenden Reservoir) | 252,000 | 1842 | 1846 |
| 254 | High Maynard | England | Greater London | TQ3550089600 51°35′20″N 0°02′44″W﻿ / ﻿51.588967°N 0.045464928°W﻿ / 51.588967; -0.045464928﻿ (High Maynard Reservoir) | 659,000 | 1867 | 1870 |
| 181 | Hilfield Park | England | Hertfordshire | TQ1570096000 51°39′03″N 0°19′44″W﻿ / ﻿51.650897°N 0.32902291°W﻿ / 51.650897; -0.32902291﻿ (Hilfield Park Reservoir) | 2,728,000 | NA | 1955 |
| 189 | Hollingworth Lake | England | Greater Manchester | SD9350015300 53°38′03″N 2°05′59″W﻿ / ﻿53.634181°N 2.0997734°W﻿ / 53.634181; -2.0997734﻿ (Hollingworth Lake) | 2,468,000 | 1794 | 1800 |
| 213 | Hollowell | England | Northamptonshire | SP6900072400 52°20′43″N 0°59′19″W﻿ / ﻿52.345343°N 0.98853688°W﻿ / 52.345343; -0.98853688﻿ (Hollowell Reservoir) | 2,064,000 | 1936 | 1939 |
| 256 | Hopes | Scotland | East Lothian | NT5470062100 55°51′00″N 2°43′30″W﻿ / ﻿55.849963°N 2.7250932°W﻿ / 55.849963; -2.7250932﻿ (Hopes Reservoir) | 600,000 | NA | 1933 |
| 85 | Howden | England | Derbyshire | SK1700092500 53°25′44″N 1°44′44″W﻿ / ﻿53.429018°N 1.7456160°W﻿ / 53.429018; -1.7456160﻿ (Howden Reservoir) | 8,990,000 | 1899 | 1916 |
| 139 | Hury | England | County Durham | NY9650019600 54°34′18″N 2°03′20″W﻿ / ﻿54.571606°N 2.0556516°W﻿ / 54.571606; -2.0556516﻿ (Hury Reservoir) | 3,905,000 | 1876 | 1894 |
| 137 | Island Barn | England | Surrey | TQ1390067000 51°23′26″N 0°21′52″W﻿ / ﻿51.390619°N 0.36439363°W﻿ / 51.390619; -0.36439363﻿ (Island Barn Reservoir) | 4,011,000 | 1900 | 1911 |
| 215 | Jumbles | England | Greater Manchester | SD7350013900 53°37′15″N 2°24′08″W﻿ / ﻿53.620963°N 2.4021067°W﻿ / 53.620963; -2.4021067﻿ (Jumbles Reservoir) | 2,050,000 | 1971 | 1971 |
| 61 | Kellington Ings Reservoir | England | North Yorkshire | SE5910024500 53°42′49″N 1°06′22″W﻿ / ﻿53.713581°N 1.1060210°W﻿ / 53.713581; -1.1060210﻿ (Kellington Ings Reservoir) | 14,400,000 | NA | NA |
| 6 | Kielder | England | Northumberland | NY7080087500 55°10′51″N 2°27′36″W﻿ / ﻿55.180922°N 2.4600692°W﻿ / 55.180922; -2.4600692﻿ (Kielder Reservoir) | 199,000,000 | 1971 | 1981 |
| 159 | Killington | England | Cumbria | SD5900091000 54°18′47″N 2°37′54″W﻿ / ﻿54.312936°N 2.6317055°W﻿ / 54.312936; -2.6317055﻿ (Killington Reservoir) | 3,238,210 | 1817 | 1819 |
| 217 | Kinder | England | Derbyshire | SK0585088190 53°23′26″N 1°54′49″W﻿ / ﻿53.390517°N 1.9135015°W﻿ / 53.390517; -1.9135015﻿ (Kinder Reservoir) | 2,028,000 | 1899 | 1912 |
| 72 | King George V | England | Greater London | TQ3740096500 51°39′02″N 0°00′55″W﻿ / ﻿51.650510°N 0.015352701°W﻿ / 51.650510; -0.015352701﻿ (King George V Reservoir) | 10,981,000 | 1893 | 1912 |
| 51 | King George VI | England | Surrey | TQ0410073200 51°26′54″N 0°30′12″W﻿ / ﻿51.448229°N 0.50336831°W﻿ / 51.448229; -0.50336831﻿ (King George VI Reservoir) | 18,732,000 | 1936 | 1947 |
| 35 | Ladybower | England | Derbyshire | SK2000085500 53°21′58″N 1°42′03″W﻿ / ﻿53.365994°N 1.7009077°W﻿ / 53.365994; -1.7009077﻿ (Ladybower Reservoir) | 27,800,000 | 1920 | 1943 |
| 222 | Lamaload | England | Cheshire | SJ9710075300 53°16′29″N 2°02′42″W﻿ / ﻿53.274675°N 2.0449474°W﻿ / 53.274675; -2.0449474﻿ (Lamaload Reservoir) | 1,932,000 | 1958 | 1963 |
| 104 | Langsett | England | South Yorkshire | SE2140000200 53°29′53″N 1°40′44″W﻿ / ﻿53.498069°N 1.6788755°W﻿ / 53.498069; -1.6788755﻿ (Langsett Reservoir) | 6,401,000 | 1897 | 1904 |
| 259 | Leeming | England | West Yorkshire | SE0380034400 53°48′21″N 1°56′38″W﻿ / ﻿53.805882°N 1.9437800°W﻿ / 53.805882; -1.9437800﻿ (Leeming Reservoir) | 408,000 | 1872 | 1878 |
| 113 | Leigh Barrier (Medway) FSR | England | Kent | TQ5650046300 51°11′40″N 0°14′18″E﻿ / ﻿51.194493°N 0.23836213°E﻿ / 51.194493; 0.23836213﻿ (Leigh Barrier (Medway) FSR) | 5,580,000 | 1976 | 1982 |
| 128 | Leighton | England | North Yorkshire | SE1620078800 54°12′17″N 1°45′11″W﻿ / ﻿54.204694°N 1.7531441°W﻿ / 54.204694; -1.7531441﻿ (Leighton Reservoir) | 4,780,000 | 1908 | 1926 |
| 165 | Lindley Wood | England | North Yorkshire | SE2150049300 53°56′22″N 1°40′26″W﻿ / ﻿53.939372°N 1.6739758°W﻿ / 53.939372; -1.6739758﻿ (Lindley Wood Reservoir) | 3,045,000 | 1870 | 1874 |
| 167 | Linton Ings | England | North Yorkshire | SE4840060400 54°02′14″N 1°15′45″W﻿ / ﻿54.037317°N 1.2624729°W﻿ / 54.037317; -1.2624729﻿ (Linton Ings Reservoir) | 3,000,000 | NA | NA |
| 238 | Little Swinburne | England | Northumberland | NY9450077200 55°05′21″N 2°05′16″W﻿ / ﻿55.089204°N 2.0877054°W﻿ / 55.089204; -2.0877054﻿ (Little Swinburne Reservoir) | 1,721,000 | 1863 | 1879 |
| 41 | Llandegfedd | Wales | Monmouhtshire / Torfaen | ST3260098500 51°40′52″N 2°58′35″W﻿ / ﻿51.681200°N 2.9762550°W﻿ / 51.681200; -2.9762550﻿ (Llandegfedd Reservoir) | 24,492,000 | 1957 | 1964 |
| 121 | Llwyn-On | Wales | Rhondda Cynon Taf | SO0110011400 51°47′33″N 3°26′07″W﻿ / ﻿51.792479°N 3.4354039°W﻿ / 51.792479; -3.4354039﻿ (Llwyn-On Reservoir) | 5,066,000 | 1884 | 1926 |
| 95 | Llyn Alaw | Wales | Gwynedd | SH3740085400 53°20′26″N 4°26′37″W﻿ / ﻿53.340440°N 4.4437297°W﻿ / 53.340440; -4.4437297﻿ (Llyn Alaw Reservoir) | 7,400,000 | 1961 | 1965 |
| 230 | Llyn Aled | Wales | Conwy | SH9160057900 53°06′26″N 3°37′15″W﻿ / ﻿53.107241°N 3.6207301°W﻿ / 53.107241; -3.6207301﻿ (Llyn Aled Reservoir) | 1,777,000 | NA | 1934 |
| 93 | Llyn Arenig Fawr | Wales | Gwynedd | SH8500037900 52°55′34″N 3°42′44″W﻿ / ﻿52.926156°N 3.7121426°W﻿ / 52.926156; -3.7121426﻿ (Llyn Arenig Fawr Reservoir) | 7,488,000 | NA | 1830 |
| 18 | Llyn Brenig | Wales | Conwy / Denbighshire | SH9770054300 53°04′34″N 3°31′43″W﻿ / ﻿53.076098°N 3.5284979°W﻿ / 53.076098; -3.5284979﻿ (Llyn Brenig Reservoir) | 54,273,000 | 1973 | 1979 |
| 30 | Llyn Brianne | Wales | Powys | SN7910048500 52°07′18″N 3°46′02″W﻿ / ﻿52.121552°N 3.7673117°W﻿ / 52.121552; -3.7673117﻿ (Llyn Brianne Reservoir) | 32,882,000 | 1967 | 1972 |
| 23 | Llyn Celyn | Wales | Gwynedd | SH8592140424 52°56′57″N 3°41′58″W﻿ / ﻿52.949031°N 3.6993374°W﻿ / 52.949031; -3.6993374﻿ (Llyn Celyn Reservoir) | 40,959,000 | 1957 | 1965 |
| 21 | Clywedog Reservoir (Llyn Clywedog) | Wales | Powys | SN8980088500 52°29′00″N 3°37′27″W﻿ / ﻿52.483257°N 3.6242003°W﻿ / 52.483257; -3.6242003﻿ (Clywedog Reservoir) | 48,828,000 | 1963 | 1967 |
| 81 | Llyn Cowlyd | Wales | Conwy | SH7380063400 53°09′10″N 3°53′19″W﻿ / ﻿53.152737°N 3.8886457°W﻿ / 53.152737; -3.8886457﻿ (Llyn Cowlyd Reservoir) | 9,432,000 | 1891 | 1897 |
| 241 | Llyn Cwellyn | Wales | Gwynedd | SH5540055600 53°04′41″N 4°09′36″W﻿ / ﻿53.077993°N 4.1600815°W﻿ / 53.077993; -4.1600815﻿ (Llyn Cwellyn Reservoir) | 1,687,000 | NA | 1976 |
| 173 | Llyn Cwmystradllyn | Wales | Gwynedd | SH5620044300 52°58′36″N 4°08′35″W﻿ / ﻿52.976703°N 4.1431080°W﻿ / 52.976703; -4.1431080﻿ (Llyn Cwmystradllyn Reservoir) | 2,902,000 | 1959 | 1959 |
| 226 | Llyn Peris | Wales | Gwynedd | SH5870059900 53°07′03″N 4°06′46″W﻿ / ﻿53.117503°N 4.1127477°W﻿ / 53.117503; -4.1127477﻿ (Llyn Peris Reservoir) | 1,870,000 | 1973 | 1979 |
| 250 | Llyn Stwlan | Wales | Gwynedd | SH6660044400 52°58′49″N 3°59′18″W﻿ / ﻿52.980292°N 3.9883645°W﻿ / 52.980292; -3.9883645﻿ (Llyn Stwlan Reservoir) | 747,000 | 1952 | 1963 |
| 11 | Bala Lake (Llyn Tegid) | Wales | Gwynedd | SH9290035000 52°54′06″N 3°35′37″W﻿ / ﻿52.901732°N 3.5937195°W﻿ / 52.901732; -3.5937195﻿ (Llyn Tegid (Bala Lake) Reservoir) | 106,751,000 | 1803 | 1804 |
| 40 | Llyn Trawsfynydd | Wales | Gwynedd | SH6940038200 52°55′31″N 3°56′39″W﻿ / ﻿52.925281°N 3.9441860°W﻿ / 52.925281; -3.9441860﻿ (Llyn Trawsfynydd Reservoir) | 26,108,000 | 1924 | 1928 |
| 140 | Loch Achonachie | Scotland | Highland | NH4460054600 57°33′17″N 4°35′56″W﻿ / ﻿57.554706°N 4.5988314°W﻿ / 57.554706; -4.5988314﻿ (Loch Achonachie Reservoir) | 3,873,000 | 1943 | 1954 |
| 37 | Loch an Diamh | Scotland | Perth and Kinross | NN5086746354 56°35′07″N 4°25′47″W﻿ / ﻿56.585328°N 4.4298309°W﻿ / 56.585328; -4.4298309﻿ (Loch an Diamh Reservoir) | 27,052,000 | 1953 | 1959 |
| 57 | Loch Arklet | Scotland | Stirling | NN3778009120 56°14′49″N 4°37′11″W﻿ / ﻿56.246825°N 4.6195911°W﻿ / 56.246825; -4.6195911﻿ (Loch Arklet Reservoir) | 16,286,000 | 1902 | 1914 |
| 54 | Loch Bradan | Scotland | South Ayrshire | NX4205297297 55°14′40″N 4°29′10″W﻿ / ﻿55.244500°N 4.4860239°W﻿ / 55.244500; -4.4860239﻿ (Loch Bradan Reservoir) | 17,475,000 | 1908 | 1912 |
| 105 | Loch Drunkie | Scotland | Stirling | NN5425004390 56°12′35″N 4°21′05″W﻿ / ﻿56.209704°N 4.3514522°W﻿ / 56.209704; -4.3514522﻿ (Loch Drunkie Reservoir) | 6,346,000 | 1854 | 1864 |
| 4 | Loch Earn | Scotland | Perth and Kinross | NN6990024200 56°23′32″N 4°06′33″W﻿ / ﻿56.392099°N 4.1091174°W﻿ / 56.392099; -4.1091174﻿ (Loch Earn Reservoir) | 397,630,000 | 1943 | 1958 |
| 190 | Loch Eigheach Gaur | Scotland | Perth and Kinross | NN4610056900 56°40′42″N 4°30′49″W﻿ / ﻿56.678440°N 4.5136547°W﻿ / 56.678440; -4.5136547﻿ (Loch Eigheach Gaur Reservoir) | 2,461,000 | 1943 | 1953 |
| 1 | Loch Ericht | Scotland | Perth and Kinross | NN5080062700 56°43′55″N 4°26′25″W﻿ / ﻿56.732022°N 4.4403880°W﻿ / 56.732022; -4.4403880﻿ (Loch Ericht Reservoir) | 1,291,596,000 | 1912 | 1962 |
| 8 | Loch Garry | Scotland | Highland | NH2760002100 57°04′39″N 4°50′45″W﻿ / ﻿57.077537°N 4.8459025°W﻿ / 57.077537; -4.8459025﻿ (Loch Garry Reservoir) | 163,272,000 | 1943 | 1956 |
| 249 | Loch Gleann A'Bhearraidh | Scotland | Argyll and Bute | NM8446426911 56°23′07″N 5°29′35″W﻿ / ﻿56.385184°N 5.4930136°W﻿ / 56.385184; -5.4930136﻿ (Loch Gleann A'Bhearraidh Reservoir) | 774,000 | 1939 | 1939 |
| 2 | Loch Katrine | Scotland | Stirling | NN4433509530 56°15′10″N 4°30′51″W﻿ / ﻿56.252698°N 4.5141613°W﻿ / 56.252698; -4.5141613﻿ (Loch Katrine Reservoir) | 804,704,000 | 1848 | 1859 |
| 49 | Loch Loyne | Scotland | Highland | NH2010007900 57°07′36″N 4°58′25″W﻿ / ﻿57.126700°N 4.9736204°W﻿ / 57.126700; -4.9736204﻿ (Loch Loyne Reservoir) | 19,859,000 | 1938 | 1957 |
| 9 | Loch Luichart | Scotland | Highland | NH3650061500 57°36′50″N 4°44′19″W﻿ / ﻿57.613757°N 4.7386845°W﻿ / 57.613757; -4.7386845﻿ (Loch Luichart Reservoir) | 128,124,000 | 1943 | 1954 |
| 16 | Loch Lyon | Scotland | Perth and Kinross | NN4520041700 56°32′30″N 4°31′09″W﻿ / ﻿56.541721°N 4.5192239°W﻿ / 56.541721; -4.5192239﻿ (Loch Lyon Reservoir) | 59,270,000 | 1951 | 1958 |
| 58 | Loch Nant | Scotland | Argyll and Bute | NN0030024900 56°22′27″N 5°14′08″W﻿ / ﻿56.374101°N 5.2354396°W﻿ / 56.374101; -5.2354396﻿ (Loch Nant Reservoir) | 15,464,000 | 1959 | 1963 |
| 3 | Loch Quoich | Scotland | Highland | NH0710002300 57°04′16″N 5°11′01″W﻿ / ﻿57.071201°N 5.1837051°W﻿ / 57.071201; -5.1837051﻿ (Loch Quoich Reservoir) | 556,677,000 | 1928 | 1955 |
| 260 | Loch Spey | Scotland | Highland | NN5810093700 57°00′45″N 4°20′19″W﻿ / ﻿57.012555°N 4.3384944°W﻿ / 57.012555; -4.3384944﻿ (Loch Spey Reservoir) | 356,000 | 1918 | 1938 |
| 86 | Loch Thom | Scotland | Renfrewshire | NS2594872193 55°54′41″N 4°47′11″W﻿ / ﻿55.911261°N 4.7862577°W﻿ / 55.911261; -4.7862577﻿ (Loch Thom Reservoir) | 8,668,000 | 1824 | 1827 |
| 65 | Loch Vaich | Scotland | Highland | NH3460074900 57°44′00″N 4°46′47″W﻿ / ﻿57.733285°N 4.7796402°W﻿ / 57.733285; -4.7796402﻿ (Loch Vaich Reservoir) | 12,388,000 | 1943 | 1957 |
| 20 | Loch Venachar | Scotland | Stirling | NN5743905550 56°13′16″N 4°18′03″W﻿ / ﻿56.221084°N 4.3007086°W﻿ / 56.221084; -4.3007086﻿ (Loch Venachar Reservoir) | 49,358,000 | 1854 | 1857 |
| 211 | Lockwood | England | Greater London | TQ3530090200 51°35′40″N 0°02′53″W﻿ / ﻿51.594407°N 0.048118991°W﻿ / 51.594407; -0.048118991﻿ (Lockwood Reservoir) | 2,106,000 | 1893 | 1903 |
| 257 | Loganlea | Scotland | Midlothian | NT1944262397 55°50′53″N 3°17′17″W﻿ / ﻿55.848025°N 3.2881891°W﻿ / 55.848025; -3.2881891﻿ (Loganlea Reservoir) | 532,000 | 1847 | 1851 |
| 271 | Low Maynard | England | Greater London | TQ3550089600 51°35′20″N 0°02′44″W﻿ / ﻿51.588967°N 0.045464928°W﻿ / 51.588967; -0.045464928﻿ (Low Maynard Reservoir) | 80,000 | 1867 | 1870 |
| 124 | Marchlyn Mawr | Wales | Gwynedd | SH6170062200 53°08′20″N 4°04′08″W﻿ / ﻿53.138951°N 4.0689468°W﻿ / 53.138951; -4.0689468﻿ (Marchlyn Mawr Reservoir) | 5,017,000 | 1973 | 1979 |
| 14 | Megget | Scotland | Scottish Borders | NT1925822198 55°29′13″N 3°16′45″W﻿ / ﻿55.486890°N 3.2792883°W﻿ / 55.486890; -3.2792883﻿ (Megget Reservoir) | 63,722,000 | 1963 | 1983 |
| 162 | Meldon | England | Devon | SX5630091600 50°42′22″N 4°02′11″W﻿ / ﻿50.706230°N 4.0364604°W﻿ / 50.706230; -4.0364604﻿ (Meldon Reservoir) | 3,170,000 | 1962 | 1972 |
| 245 | Mickletown Washland | England | West Yorkshire | SE4150027100 53°44′19″N 1°22′20″W﻿ / ﻿53.738640°N 1.3723192°W﻿ / 53.738640; -1.3723192﻿ (Mickletown Washland Reservoir) | 1,655,000 | NA | NA |
| 227 | Midhope | England | South Yorkshire | SK2230099400 53°29′27″N 1°39′55″W﻿ / ﻿53.490841°N 1.6653653°W﻿ / 53.490841; -1.6653653﻿ (Midhope Reservoir) | 1,859,000 | 1895 | 1903 |
| 244 | Misson East FSA | England | Nottinghamshire | SK7090094900 53°26′46″N 0°56′02″W﻿ / ﻿53.446107°N 0.93397635°W﻿ / 53.446107; -0.93397635﻿ (Misson East FSA) | 1,670,000 | NA | NA |
| 233 | Misson West FSA | England | Nottinghamshire | SK6850094000 53°26′18″N 0°58′13″W﻿ / ﻿53.438336°N 0.97030047°W﻿ / 53.438336; -0.97030047﻿ (Misson West FSA) | 1,750,000 | NA | NA |
| 207 | More Hall | England | South Yorkshire | SK2870095800 53°27′29″N 1°34′09″W﻿ / ﻿53.458175°N 1.5692355°W﻿ / 53.458175; -1.5692355﻿ (More Hall Reservoir) | 2,172,989 | 1867 | 1929 |
| 7 | Loch Mullardoch | Scotland | Highland | NH2220031300 57°20′15″N 4°57′21″W﻿ / ﻿57.337439°N 4.9557405°W﻿ / 57.337439; -4.9557405﻿ (Mullardoch Reservoir) | 165,226,000 | 1943 | 1951 |
| 39 | Nant-y-Moch | Wales | Ceredigion | SN7540086200 52°27′34″N 3°50′07″W﻿ / ﻿52.459490°N 3.8352785°W﻿ / 52.459490; -3.8352785﻿ (Nant-y-Moch Reservoir) | 26,292,000 | 1955 | 1964 |
| 193 | Northampton Washlands | England | West Northamptonshire | SP7950060200 52°14′03″N 0°50′14″W﻿ / ﻿52.234265°N 0.83730834°W﻿ / 52.234265; -0.83730834﻿ (Northampton Washlands) | 2,340,000 | NA | NA |
| 107 | Ogston | England | Derbyshire | SK3780059900 53°08′06″N 1°26′11″W﻿ / ﻿53.134923°N 1.4364542°W﻿ / 53.134923; -1.4364542﻿ (Ogston Reservoir) | 6,180,000 | 1953 | 1958 |
| 198 | Oldbury Power Station | England | Gloucestershire | ST6000095000 51°39′08″N 2°34′46″W﻿ / ﻿51.652358°N 2.5795759°W﻿ / 51.652358; -2.5795759﻿ (Oldbury Power Station Reservoir) | 2,300,000 | NA | NA |
| 12 | Ouse Washes | England | Cambridgeshire | TL5000089000 52°28′42″N 0°12′26″E﻿ / ﻿52.478317°N 0.20724239°E﻿ / 52.478317; 0.20724239﻿ (Ouse Washes Reservoir) | 90,000,000 | NA | 1652 |
| 114 | Penygarreg | Wales | Powys | SN9030067400 52°17′37″N 3°36′36″W﻿ / ﻿52.293742°N 3.6099246°W﻿ / 52.293742; -3.6099246﻿ (Penygarreg Reservoir) | 5,558,000 | 1892 | 1904 |
| 53 | Pitsford | England | Northamptonshire | SP7550068900 52°18′47″N 0°53′38″W﻿ / ﻿52.313028°N 0.89392331°W﻿ / 52.313028; -0.89392331﻿ (Pitsford Reservoir) | 17,545,000 | 1946 | 1955 |
| 74 | Pontsticill (Taf Fechan) | Wales | Merthyr Tydfil / Powys | SO0610011800 51°47′49″N 3°21′47″W﻿ / ﻿51.796937°N 3.3630375°W﻿ / 51.796937; -3.3630375﻿ (Pontsticill (Taf Fechan) Reservoir) | 10,717,000 | 1921 | 1927 |
| 55 | Queen Elizabeth II | England | Surrey | TQ1180067100 51°23′31″N 0°23′40″W﻿ / ﻿51.391935°N 0.39453096°W﻿ / 51.391935; -0.39453096﻿ (Queen Elizabeth II Reservoir) | 16,809,000 | 1935 | 1967 |
| 33 | Queen Mary | England | Surrey | TQ0730069700 51°24′58″N 0°27′30″W﻿ / ﻿51.416173°N 0.45839646°W﻿ / 51.416173; -0.45839646﻿ (Queen Mary Reservoir) | 30,363,000 | 1911 | 1925 |
| 31 | Queen Mother | England | Berkshire | TQ0090076800 51°28′52″N 0°32′54″W﻿ / ﻿51.481166°N 0.54837454°W﻿ / 51.481166; -0.54837454﻿ (Queen Mother Reservoir) | 31,492,000 | 1945 | 1976 |
| 225 | Ravensthorpe | England | West Northamptonshire | SP6810070400 52°19′39″N 1°00′08″W﻿ / ﻿52.327477°N 1.0021509°W﻿ / 52.327477; -1.0021509﻿ (Ravensthorpe Reservoir) | 1,884,000 | 1880 | 1890 |
| 200 | Rhodeswood | England | Derbyshire | SK0440098200 53°28′50″N 1°56′07″W﻿ / ﻿53.480505°N 1.9351681°W﻿ / 53.480505; -1.9351681﻿ (Rhodeswood Reservoir) | 2,273,000 | 1848 | 1855 |
| 262 | River Shin | Scotland | Highland | NC5820005100 58°00′45″N 4°24′06″W﻿ / ﻿58.012378°N 4.4016958°W﻿ / 58.012378; -4.4016958﻿ (River Shin Reservoir) | 316,000 | 1954 | 1958 |
| 161 | River Till Controlled Washland | England | Nottinghamshire | SK7030077500 53°17′23″N 0°56′49″W﻿ / ﻿53.289812°N 0.94687140°W﻿ / 53.289812; -0.94687140﻿ (River Till Controlled Washland) | 3,200,000 | 1977 | 1990 |
| 106 | River Witham Flood Washlands | England | Lincolnshire | SK9520063800 53°09′46″N 0°34′39″W﻿ / ﻿53.162822°N 0.57753531°W﻿ / 53.162822; -0.57753531﻿ (River Witham Flood Washlands) | 6,300,000 | NA | NA |
| 100 | Rivington Lower | England | Lancashire | SD6300012400 53°36′25″N 2°33′38″W﻿ / ﻿53.606843°N 2.5606621°W﻿ / 53.606843; -2.5606621﻿ (Rivington Lower) | 6,516,000 | 1850 | 1857 |
| 27 | Roadford | England | Devon | SX4200090000 50°41′17″N 4°14′17″W﻿ / ﻿50.688140°N 4.2381365°W﻿ / 50.688140; -4.2381365﻿ (Roadford Reservoir) | 36,910,000 | 1976 | 1989 |
| 188 | Roundhill | England | North Yorkshire | SE1500077200 54°11′25″N 1°46′18″W﻿ / ﻿54.190351°N 1.7716197°W﻿ / 54.190351; -1.7716197﻿ (Roundhill Reservoir) | 2,503,000 | NA | 1910 |
| 170 | Rudyard | England | Staffordshire | SJ9450059600 53°08′01″N 2°05′01″W﻿ / ﻿53.133529°N 2.0836602°W﻿ / 53.133529; -2.0836602﻿ (Rudyard Reservoir) | 2,949,700 | NA | 1796 |
| 10 | Rutland Water | England | Rutland | SK9440008000 52°39′41″N 0°36′20″W﻿ / ﻿52.661511°N 0.60569370°W﻿ / 52.661511; -0.60569370﻿ (Rutland Water) | 124,000,000 | 1968 | 1976 |
| 242 | Scaling | England | North Yorkshire | NZ7490012800 54°30′18″N 0°50′41″W﻿ / ﻿54.504993°N 0.84482832°W﻿ / 54.504993; -0.84482832﻿ (Scaling Reservoir) | 1,682,000 | 1946 | 1958 |
| 91 | Scammonden | England | West Yorkshire | SE0530016700 53°38′48″N 1°55′17″W﻿ / ﻿53.646781°N 1.9212997°W﻿ / 53.646781; -1.9212997﻿ (Scammonden Reservoir) | 7,873,000 | 1965 | 1969 |
| 77 | Scar House | England | North Yorkshire | SE0580076900 54°11′16″N 1°54′45″W﻿ / ﻿54.187839°N 1.9126169°W﻿ / 54.187839; -1.9126169﻿ (Scar House Reservoir) | 10,069,000 | 1921 | 1936 |
| 171 | Seathwaite Tarn | England | Cumbria | SD2500098600 54°22′38″N 3°09′22″W﻿ / ﻿54.377355°N 3.1561370°W﻿ / 54.377355; -3.1561370﻿ (Seathwaite Tarn Reservoir) | 2,945,000 | 1900 | 1907 |
| 59 | Selset | England | County Durham | NY9180021100 54°35′06″N 2°07′42″W﻿ / ﻿54.585031°N 2.1283928°W﻿ / 54.585031; -2.1283928﻿ (Selset Reservoir) | 15,320,000 | 1955 | 1960 |
| 223 | Shustoke Lower | England | Warwickshire | SP2280091200 52°31′06″N 1°39′56″W﻿ / ﻿52.518210°N 1.6654290°W﻿ / 52.518210; -1.6654290﻿ (Shustoke Lower Reservoir) | 1,921,000 | 1870 | 1884 |
| 150 | Siblyback | England | Cornwall | SX2320070300 50°30′21″N 4°29′41″W﻿ / ﻿50.505737°N 4.4946487°W﻿ / 50.505737; -4.4946487﻿ (Siblyback Reservoir) | 3,364,000 | 1965 | 1969 |
| 62 | Silent Valley | Northern Ireland | County Down | SB3865978967 54°08′24″N 6°00′10″W﻿ / ﻿54.139876°N 6.0027439°W﻿ / 54.139876; -6.0027439﻿ (Silent Valley Reservoir) | 13,638,270 | 1910 | 1933 |
| 97 | Staines North | England | Surrey | TQ0500073600 51°27′06″N 0°29′25″W﻿ / ﻿51.451658°N 0.49030334°W﻿ / 51.451658; -0.49030334﻿ (Staines North Reservoir) | 6,940,000 | 1898 | 1902 |
| 94 | Staines South | England | Surrey | TQ0500072500 51°26′30″N 0°29′26″W﻿ / ﻿51.441771°N 0.49062937°W﻿ / 51.441771; -0.49062937﻿ (Staines South Reservoir) | 7,469,000 | 1898 | 1902 |
| 99 | Staunton Harold | England | Derbyshire | SK3767923473 52°48′27″N 1°26′33″W﻿ / ﻿52.807498°N 1.4424902°W﻿ / 52.807498; -1.4424902﻿ (Staunton Harold Reservoir) | 6,655,000 | 1958 | 1964 |
| 115 | Stithians | England | Cornwall | SW7190036400 50°11′01″N 5°11′47″W﻿ / ﻿50.183607°N 5.1965073°W﻿ / 50.183607; -5.1965073﻿ (Stithians Reservoir) | 5,420,000 | 1955 | 1967 |
| 68 | Stocks | England | Lancashire | SD7200054600 53°59′12″N 2°25′43″W﻿ / ﻿53.986684°N 2.4284992°W﻿ / 53.986684; -2.4284992﻿ (Stocks Reservoir) | 11,800,000 | 1910 | 1932 |
| 203 | Strines | England | South Yorkshire | SK2320090500 53°24′39″N 1°39′09″W﻿ / ﻿53.410806°N 1.6524541°W﻿ / 53.410806; -1.6524541﻿ (Strines Reservoir) | 2,239,000 | 1853 | 1869 |
| 184 | Sutton Bingham | England | Somerset | ST5540011400 50°54′01″N 2°38′08″W﻿ / ﻿50.900343°N 2.6356000°W﻿ / 50.900343; -2.6356000﻿ (Sutton Bingham Reservoir) | 2,600,000 | 1952 | 1955 |
| 138 | Swinsty | England | North Yorkshire | SE1960053400 53°58′35″N 1°42′10″W﻿ / ﻿53.976296°N 1.7026564°W﻿ / 53.976296; -1.7026564﻿ (Swinsty Reservoir) | 3,936,000 | 1871 | 1877 |
| 204 | Swithland | England | Leicestershire | SK5570014800 52°43′41″N 1°10′36″W﻿ / ﻿52.727983°N 1.1766534°W﻿ / 52.727983; -1.1766534﻿ (Swithland Reservoir) | 2,227,540 | 1890 | 1896 |
| 180 | "Tadcaster, Hackenby, North Ings and Cock Beck" | England | North Yorkshire | SE4950042000 53°52′19″N 1°14′55″W﻿ / ﻿53.871853°N 1.2486563°W﻿ / 53.871853; -1.2486563﻿ (Tadcaster, Hackenby, North Ings and Cock Beck Reservoir) | 2,748,750 | NA | NA |
| 66 | Talla | Scotland | Scottish Borders | NT1171721532 55°28′47″N 3°23′54″W﻿ / ﻿55.479603°N 3.3983738°W﻿ / 55.479603; -3.3983738﻿ (Talla Reservoir) | 12,020,000 | 1897 | 1905 |
| 67 | Talybont | Wales | Powys | SO1060020500 51°52′33″N 3°18′00″W﻿ / ﻿51.875877°N 3.3000529°W﻿ / 51.875877; -3.3000529﻿ (Talybont Reservoir) | 11,921,000 | 1930 | 1939 |
| 221 | Tanygrisiau | Wales | Gwynedd | SH6830044700 52°59′00″N 3°57′47″W﻿ / ﻿52.983408°N 3.9631826°W﻿ / 52.983408; -3.9631826﻿ (Tanygrisiau Reservoir) | 1,970,000 | 1952 | 1963 |
| 25 | Thirlmere | England | Cumbria | NY3100019000 54°33′41″N 3°04′07″W﻿ / ﻿54.561506°N 3.0685524°W﻿ / 54.561506; -3.0685524﻿ (Thirlmere Reservoir) | 40,714,000 | 1879 | 1894 |
| 92 | Thruscross | England | North Yorkshire | SE1520057800 54°00′58″N 1°46′10″W﻿ / ﻿54.015989°N 1.7695224°W﻿ / 54.015989; -1.7695224﻿ (Thruscross Reservoir) | 7,800,000 | 1955 | 1966 |
| 101 | Tittesworth | England | Staffordshire | SJ9930058700 53°07′32″N 2°00′43″W﻿ / ﻿53.125468°N 2.0119145°W﻿ / 53.125468; -2.0119145﻿ (Tittesworth Reservoir) | 6,440,000 | 1858 | 1858 |
| 98 | Torside | England | Derbyshire | SK0560098300 53°28′53″N 1°55′02″W﻿ / ﻿53.481393°N 1.9170845°W﻿ / 53.481393; -1.9170845﻿ (Torside Reservoir) | 6,700,000 | 1848 | 1864 |
| 192 | Tunstall | England | County Durham | NZ0650040800 54°45′44″N 1°54′02″W﻿ / ﻿54.762095°N 1.9005097°W﻿ / 54.762095; -1.9005097﻿ (Tunstall Reservoir) | 2,360,000 | 1873 | 1879 |
| 169 | Underbank | England | South Yorkshire | SK2530099200 53°29′20″N 1°37′13″W﻿ / ﻿53.488908°N 1.6201667°W﻿ / 53.488908; -1.6201667﻿ (Underbank Reservoir) | 2,955,000 | 1897 | 1904 |
| 71 | Usk | Wales | Carmarthenshire / Powys | SN8217428549 51°56′35″N 3°42′56″W﻿ / ﻿51.942925°N 3.7155557°W﻿ / 51.942925; -3.7155557﻿ (Usk Reservoir) | 11,235,000 | 1950 | 1955 |
| 182 | Vale House | England | Derbyshire | SK0326097420 53°28′25″N 1°57′08″W﻿ / ﻿53.473502°N 1.9523536°W﻿ / 53.473502; -1.9523536﻿ (Vale House Reservoir) | 2,688,000 | 1848 | 1870 |
| 15 | Vyrnwy | Wales | Powys | SJ0180019300 52°45′44″N 3°27′24″W﻿ / ﻿52.762346°N 3.4567214°W﻿ / 52.762346; -3.4567214﻿ (Vyrnwy Reservoir) | 59,852,000 | 1879 | 1888 |
| 252 | Walthamstow No.4 | England | Greater London | TQ3540089100 51°35′04″N 0°02′50″W﻿ / ﻿51.584498°N 0.047100199°W﻿ / 51.584498; -0.047100199﻿ (Walthamstow No.4 Reservoir) | 680,000 | 1853 | 1866 |
| 253 | Walthamstow No.5 | England | Greater London | TQ3550088600 51°34′48″N 0°02′45″W﻿ / ﻿51.579981°N 0.045850528°W﻿ / 51.579981; -0.045850528﻿ (Walthamstow No.5 Reservoir) | 680,000 | 1853 | 1866 |
| 179 | Walton - Bessborough | England | Surrey | TQ1220068000 51°24′00″N 0°23′19″W﻿ / ﻿51.399946°N 0.38850014°W﻿ / 51.399946; -0.38850014﻿ (Walton - Bessborough Reservoir) | 2,757,000 | 1898 | 1907 |
| 228 | Walton - Knight | England | Surrey | TQ1170068000 51°24′00″N 0°23′44″W﻿ / ﻿51.400044°N 0.39568466°W﻿ / 51.400044; -0.39568466﻿ (Walton - Knight Reservoir) | 1,857,000 | 1898 | 1907 |
| 216 | Waskerley | England | County Durham | NZ0250044300 54°47′37″N 1°57′46″W﻿ / ﻿54.793583°N 1.9626426°W﻿ / 54.793583; -1.9626426﻿ (Waskerley Reservoir) | 2,046,500 | 1877 | 1877 |
| 156 | Watergrove | England | Greater Manchester | SD9100017700 53°39′21″N 2°08′16″W﻿ / ﻿53.655715°N 2.1376509°W﻿ / 53.655715; -2.1376509﻿ (Watergrove Reservoir) | 3,273,000 | 1930 | 1938 |
| 120 | Wayoh | England | Lancashire | SD7370016400 53°38′36″N 2°23′57″W﻿ / ﻿53.643443°N 2.3992954°W﻿ / 53.643443; -2.3992954﻿ (Wayoh Reservoir) | 5,100,000 | 1865 | 1876 |
| 112 | Weirwood | England | East Sussex | TQ4060035300 51°05′59″N 0°00′24″E﻿ / ﻿51.099772°N 0.0066761370°E﻿ / 51.099772; 0.0066761370﻿ (Weirwood Reservoir) | 5,623,000 | 1950 | 1954 |
| 235 | Wentwood | Wales | Newport | ST4300092900 51°37′55″N 2°49′30″W﻿ / ﻿51.632009°N 2.8249355°W﻿ / 51.632009; -2.8249355﻿ (Wentwood Reservoir) | 1,739,000 | 1896 | 1904 |
| 117 | West Moor Reservoir | England | Somerset | ST4160032600 51°05′23″N 2°50′07″W﻿ / ﻿51.089725°N 2.8352377°W﻿ / 51.089725; -2.8352377﻿ (West Moor Reservoir) | 5,359,000 | NA | NA |
| 255 | West Warwick | England | Greater London | TQ3460088300 51°34′39″N 0°03′32″W﻿ / ﻿51.577501°N 0.058946209°W﻿ / 51.577501; -0.058946209﻿ (West Warwick Reservoir) | 639,000 | 1853 | 1900 |
| 151 | West Water | Scotland | Scottish Borders | NT1173052377 55°45′24″N 3°24′29″W﻿ / ﻿55.756672°N 3.4080668°W﻿ / 55.756672; -3.4080668﻿ (West Water Reservoir) | 3,364,000 | 1966 | 1969 |
| 199 | Wet Sleddale | England | Cumbria | NY5530011600 54°29′52″N 2°41′30″W﻿ / ﻿54.497744°N 2.6916824°W﻿ / 54.497744; -2.6916824﻿ (Wet Sleddale Reservoir) | 2,282,000 | 1880 | 1966 |
| 247 | White Holme | England | West Yorkshire | SD9710019900 53°40′32″N 2°02′43″W﻿ / ﻿53.675560°N 2.0453756°W﻿ / 53.675560; -2.0453756﻿ (White Holme Reservoir) | 1,601,000 | 1807 | 1816 |
| 133 | Whiteadder | Scotland | East Lothian | NT6540063500 55°51′48″N 2°33′16″W﻿ / ﻿55.863430°N 2.5543847°W﻿ / 55.863430; -2.5543847﻿ (Whiteadder Reservoir) | 4,239,000 | 1959 | 1968 |
| 172 | Widdop | England | West Yorkshire | SD9300033000 53°47′36″N 2°06′28″W﻿ / ﻿53.793263°N 2.1077415°W﻿ / 53.793263; -2.1077415﻿ (Widdop Reservoir) | 2,912,000 | 1872 | 1878 |
| 219 | Willen Lake | England | Buckinghamshire | SP8810040900 52°03′34″N 0°42′59″W﻿ / ﻿52.059485°N 0.71640948°W﻿ / 52.059485; -0.71640948﻿ (Willen Lake Reservoir) | 2,004,000 | 1967 | 1972 |
| 56 | William Girling | England | Greater London | TQ3670094100 51°37′45″N 0°01′35″W﻿ / ﻿51.629115°N 0.026400980°W﻿ / 51.629115; -0.026400980﻿ (William Girling Reservoir) | 16,500,000 | 1935 | 1951 |
| 46 | Wimbleball | England | Somerset | SS9670029300 51°03′13″N 3°28′31″W﻿ / ﻿51.053723°N 3.4752172°W﻿ / 51.053723; -3.4752172﻿ (Wimbleball Reservoir) | 21,541,000 | 1968 | 1979 |
| 87 | Winscar | England | South Yorkshire | SE1530002600 53°31′11″N 1°46′15″W﻿ / ﻿53.519852°N 1.7707125°W﻿ / 53.519852; -1.7707125﻿ (Winscar Reservoir) | 8,300,000 | 1970 | 1975 |
| 131 | Woodhead | England | Derbyshire | SK0820099400 53°29′28″N 1°52′40″W﻿ / ﻿53.491247°N 1.8778781°W﻿ / 53.491247; -1.8778781﻿ (Woodhead Reservoir) | 4,700,000 | 1848 | 1877 |
| 38 | Wraysbury | England | Surrey | TQ0250074500 51°27′37″N 0°31′34″W﻿ / ﻿51.460205°N 0.52600813°W﻿ / 51.460205; -0.52600813﻿ (Wraysbury Reservoir) | 26,910,000 | 1945 | 1970 |
| 158 | Yarrow | England | Lancashire | SD6240015500 53°38′05″N 2°34′12″W﻿ / ﻿53.634662°N 2.5701051°W﻿ / 53.634662; -2.5701051﻿ (Yarrow Reservoir) | 3,252,000 | 1850 | 1877 |
| 155 | Ystradfellte | Wales | Powys | SN9460017500 51°50′46″N 3°31′53″W﻿ / ﻿51.846116°N 3.5314738°W﻿ / 51.846116; -3.5314738﻿ (Ystradfellte Reservoir) | 3,277,000 | 1902 | 1914 |

## Largest in England and Wales (2012)

| 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 | Clywedog Reservoir | 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 | 4,050,000 |
| 14 | Roadford Lake | South West Water | Devon | 1989 | 36,910,000 | 2,987,000 |
| 15 | Carsington Water | Severn Trent Water | Derbyshire | 1992 | 36,331,000 | 3,000,000 |
| 16 | Caban Coch | Welsh Water | Powys | 1904 | 35,531,000 | 2,023,000 |
| 17 | Llyn Trawsfynydd | Magnox Ltd | Gwynedd | 1928 | 33,190,000 | 4,800,000 |
| 18 | Nant y Moch | Statkraft | Ceredigion | 1964 | 32,564,000 | 2,630,000 |
| 19 | Queen Mother Reservoir | Thames Water | Greater London | 1976 | 31,492,000 | 1,922,000 |
| 20 | Bewl Water | Southern Water | East Sussex | 1975 | 31,000,000 | 3,120,000 |
| 21 | Queen Mary Reservoir | Thames Water | Greater London | 1931 | 30,363,000 | 2,863,000 |
| 22 | Colliford Lake | South West Water | Cornwall | 1983 | 29,100,000 | 3,660,000 |
| 23 | Ladybower Reservoir | Severn Trent Water | Derbyshire | 1943 | 27,800,000 | 2,100,000 |
| 24 | Hanningfield Reservoir | Essex and Suffolk Water | Essex | 1957 | 27,721,000 | 3,536,000 |
| 25 | Wraysbury Reservoir | Thames Water | Greater London | 1970 | 26,910,000 | 2,023,000 |
| 26 | Abberton Reservoir | Essex and Suffolk Water | Essex | 1939 | 25,721,000 | 4,900,000 |
| 27 | Llandegfedd Reservoir | Welsh Water | Monmouthshire | 1965 | 24,660,000 | 1,760,445 |
| 28 | Draycote Water | Severn Trent Water | Warwickshire | 1969 | 22,730,000 | 2,430,000 |
| 29 | Grimwith Reservoir | Yorkshire Water | North Yorkshire | 1983 | 22,200,000 | 1,500,000 |
| 30 | Wimbleball Lake | South West Water | Somerset | 1979 | 21,541,000 | 1,620,000 |
| 31 | Chew Valley Lake | Bristol Water | Somerset | 1956 | 20,457,000 | 4,856,000 |
| 32 | Balderhead Reservoir | Northumbrian Water | County Durham | 1961 | 19,618,000 | 1,170,000 |
| 33 | King George VI Reservoir | Thames Water | Greater London | 1947 | 18,732,000 | 1,420,000 |
| 34 | Blithfield Reservoir | South Staffordshire Water | Staffordshire | 1953 | 18,172,000 | 3,190,000 |
| 35 | Pitsford Water | Anglian Water | Northamptonshire | 1956 | 17,545,000 | 3,030,000 |
| 36 | Queen Elizabeth II Reservoir | Thames Water | Greater London | 1962 | 16,809,000 | 1,283,000 |
| 37 | William Girling Reservoir | Thames Water | Greater London | 1951 | 16,500,000 | 1,350,000 |
| 38 | Pontsticill Reservoir | Welsh Water | Powys | 1927 | 15,640,000 | 1,412,000 |
| 39 | Selset Reservoir | Northumbrian Water | County Durham | 1960 | 15,320,000 | 1,110,000 |
| 40 | Alwen Reservoir | Welsh Water | Conwy | 1921 | 14,564,200 | 1,490,000 |
| 41 | King George V Reservoir | Thames Water | Greater London | 1912 | 13,970,000 | 1,720,000 |
| 42 | Foremark Reservoir | Severn Trent Water | Derbyshire | 1977 | 13,193,486 | 930,000 |
| 43 | Usk Reservoir | Welsh Water | Powys | 1955 | 12,253,000 | 1,160,000 |
| 44 | Stocks Reservoir | United Utilities | Lancashire | 1932 | 12,006,000 | 1,390,000 |
| 45 | Talybont Reservoir | Welsh Water | Powys | 1939 | 11,668,000 | 1,272,000 |
| 46 | Covenham Reservoir | Anglian Water | Lincolnshire | 1972 | 10,900,000 | 882,000 |
| 47 | Catcleugh Reservoir | Northumbrian Water | Northumberland | 1905 | 10,480,000 | 987,000 |
| 48 | Scar House Reservoir | Yorkshire Water | North Yorkshire | 1936 | 10,069,000 | 700,000 |