List of dams and reservoirs in the United Kingdom

• Bollinhurst Reservoir
• Bosley Reservoir, Bosley
• Horse Coppice Reservoir
• Lamaload Reservoir, east of Macclesfield
• Lymm Dam, Lymm.
• Ridgegate Reservoir and Trentabank Reservoir, south-east of Macclesfield
• Sutton Reservoir, south of Macclesfield

• Argal and College Reservoirs, Falmouth
• Boscathnoe Reservoir, Penzance
• Bussow Reservoir, St Ives
• Cargenwen Reservoir
• Colliford Lake, Bodmin Moor
• Crowdy Reservoir, Bodmin Moor
• Drift Reservoir, Penzance
• Porth Reservoir, Newquay
• Siblyback Lake, Bodmin Moor
• Stithians Reservoir
• Upper Tamar Lake (Devon and Cornwall)

• Balderhead Reservoir
• Blackton Reservoir
• Burnhope Reservoir
• Derwent Reservoir
• Grassholme Reservoir
• Hisehope Reservoir
• Hurworth Burn Reservoir
• Hury Reservoir
• Selset Reservoir
• Smiddy Shaw Reservoir
• Tunstall Reservoir
• Waskerley Reservoir

• Borrans Reservoir, north of Windermere (town)
• Castle Carrock Reservoir
• Chapelhouse Reservoir, south-east of Uldale
• Cow Green Reservoir east of Dufton Fell
• Dubbs Reservoir, north of Windermere (town)
• Ennerdale Water
• Fisher Tarn east of Kendal
• Harlock Reservoir, Pennington Reservoir, Poaka Beck Reservoir west of the town of Ulverston
• Haweswater Reservoir
• Hayeswater
• Kentmere Reservoir
• Killington Reservoir
• Meadley Reservoir, by Flat Fell, Ennerdale, Cumbria
• Simpson Ground Reservoir, east of Newby Bridge
• Thirlmere
• Wet Sleddale Reservoir

• Butterley Reservoir
• Codnor Reservoir
• Carsington Water
• Combs Reservoir
• Errwood Reservoir
• Fernilee Reservoir
• Foremark Reservoir
• Hurst Reservoir
• Kinder Reservoir
• Linacre Reservoirs
  • Upper Reservoir
  • Middle Reservoir
  • Lower Reservoir
• Longdendale Chain of reservoirs
  • Arnfield Reservoir
  • Hollingworth Reservoir now drained and a nature reserve
  • Bottoms Reservoir
  • Valehouse Reservoir
  • Rhodeswood Reservoir
  • Torside Reservoir
  • Woodhead Reservoir
• Loscoe Dam
• Mossy Lea Reservoir
• Ogston Reservoir
• Staunton Harold Reservoir
• Swineshaw Reservoir (Derbyshire)
• Toddbrook Reservoir
• Upper Derwent Valley
  • Ladybower Reservoir
  • Derwent Reservoir with Birchinlee
  • Howden Reservoir Eastern half is in Sheffield (South Yorkshire)
• Upper Swineshaw Reservoir (Derbyshire)

• Avon Dam Reservoir
• Burrator Reservoir
• Challacombe/Bray Reservoir
• Butter Brook Reservoir
• Darracott Reservoir
• Fernworthy Reservoir
• Gammaton Reservoirs
• Holywell Reservoir
• Jennetts Reservoir
• Kennick Reservoir
• Lower Tamar Lake
• Melbury Reservoir
• Meldon Reservoir
• River Tavy Reservoir
• Roadford Lake
• Slade Reservoir
• Squabmoor reservoir
• Tottiford Reservoir
• Trenchford Reservoir
• Upper Tamar Lake (Devon and Cornwall)
• Venford Reservoir
• Wheal Jewell Reservoir
• Wistlandpound Reservoir

• Bolton:
  • Belmont Reservoir
  • Bryan Hey Reservoir
  • Dean Mills Reservoir
  • High Rid Reservoir
  • Lower Rivington Reservoir
  • Rumworth Lodge Reservoir
  • Upper Rivington Reservoir
• Bury
  • Lowercroft Reservoir
  • Manchester, Bolton and Bury Reservoir (Elton Reservoir)
• Manchester:
  • Gorton Reservoirs
  • Heaton Park Reservoir
• Oldham:
  • Ashworth Moor Reservoir
  • Besom Hill Reservoir
  • Black Moss Reservoir (Greater Manchester)
  • Brownhouse Wham Reservoir
  • Brushes Clough Reservoir
  • Castleshaw Reservoir
  • Chew_Reservoir
  • Crook Gate Reservoir
  • Diggle Reservoir
  • Dovestones Reservoir
  • Dowry Reservoir
  • Greenfield Reservoir
  • Hamer Pasture Reservoir
  • New Years Bridge Reservoir
  • Readycon Dean Reservoir
  • Strinesdale Reservoir
  • Yeoman Hey Reservoir
• Rochdale:
  • Ashworth Moor Reservoir
  • Blackstone Edge Reservoir
  • Chelburn Reservoir
  • Greenbooth Reservoir
  • Hanging Lees Reservoir
  • Hollingworth Lake
  • Kitcliffe Reservoir
  • Light Hazzles Reservoir
  • Lower Chelburn Reservoir
  • Naden Reservoirs (Higher, Middle and Lower)
  • Norman Hill Reservoir
  • Ogden Reservoir
  • Piethorne Reservoir
  • Rooden Reservoir
  • Watergrove Reservoir
• Tameside:
  • Audenshaw Reservoirs
  • Brushes Reservoir
  • Denton Reservoirs
  • Godley Reservoir
  • Higher Swineshaw Reservoir
  • Lower Swineshaw Reservoir
  • Swineshaw Reservoirs
  • Walkerwood Reservoir
• Wigan:
  • Worthington Lakes

• Anglezarke Reservoir
• Belmont Reservoir
• Black Moss Reservoirs
• Calf Hey Reservoir
• Cowm Reservoir
• Delph Reservoir
• Dingle Reservoir
• Foulridge Reservoir
• High Bullough Reservoir
• Holden Wood Reservoir
• Jumbles Reservoir
• Lower Rivington Reservoir
• Lower Roddlesworth Reservoir
• Lower Ogden Reservoir
• Rake Brook Reservoir
• Spring Mill Reservoir
• Springs Reservoir
• Stocks Reservoir
• Turton and Entwistle Reservoir
• Upper Ogden Reservoir
• Upper Rivington Reservoir
• Upper Roddlesworth Reservoir
• Walves Reservoir
• Ward's Reservoir (Blue Lagoon)
• Watersheddles Reservoir (owned by Yorkshire Water)
• Wayoh Reservoir
• Yarrow Reservoir

• Blackbrook Reservoir
• Eyebrook Reservoir (Corby)
• Cropston Reservoir
• Knipton Reservoir
• Nanpantan Reservoir
• Saddington Reservoir
• Staunton Harold Reservoir
• Swithland Reservoir
• Thornton Reservoir

• Brent Reservoir (also known as the Welsh Harp)
• Grand Junction Reservoir
• Stain Hill Reservoirs
• Stoke Newington West Reservoir
• Sunnyside Reservoir

The following reservoirs form the Lee Valley Reservoir Chain.

• King George's Reservoir, London Borough of Enfield (also known as King George V Reservoir)
• William Girling Reservoir, London Borough of Enfield
• Banbury Reservoir, London Borough of Waltham Forest
• Lockwood Reservoir, London Borough of Waltham Forest
• High Maynard Reservoir, London Borough of Waltham Forest
• Low Maynard Reservoir, London Borough of Waltham Forest
• Walthamstow Reservoirs, London Borough of Waltham Forest, five linked numbered reservoirs
• East Warwick Reservoir, London Borough of Waltham Forest
• West Warwick Reservoir, London Borough of Waltham Forest

• Barby Storage Reservoir
• Boddington Reservoir, Oxford canal supply reservoir, Upper Boddington[1]
• Cransley Reservoir (Kettering)
• Daventry Reservoir in Daventry Country Park
• Drayton Reservoir (Daventry)
• Hollowell reservoir Hollowell
• Naseby Reservoir, Grand Union Canal supply, Naseby[2]
• Pitsford Water
• Ravensthorpe Reservoir
• Stanford Reservoir, between Stanford-on-Avon and South Kilworth
• Sulby Reservoir
• Sywell Reservoir
• Thorpe Malsor Reservoir (Kettering)
• Welford Reservoir

• Bakethin Reservoir
• Catcleugh Reservoir
• Colt Crag Reservoir
• Fontburn
• Hallington Reservoirs
• Little Swinburne Reservoir
• Kielder Water
• Whittle Dene

• Angram Reservoir
• Beaver Dyke Reservoirs
• Chelker Reservoir
• Cod Beck Reservoir
• Elslack Reservoir
• Embsay Reservoir
• Fewston Reservoir
• Gouthwaite Reservoir
• Grimwith Reservoir
• Laneshaw Reservoir
• Leighton Reservoir
• Lindley Wood Reservoir
• Lockwood Beck Reservoir
• Lower Barden Reservoir
• Lumley Moor Reservoir
• March Ghyll Reservoir
• Mossy Moor Reservoir
• Oulston Reservoir
• Roundhill Reservoir
• Scaling Dam Reservoir
• Scar House Reservoir
• Scargill Reservoir
• Swinsty Reservoir
• Ten Acre Reservoir
• Thornton Steward Reservoir
• Thruscross Reservoir
• Upper Barden Reservoir
• Winterburn Reservoir

• Ashford Reservoir
• Barrow Gurney Tanks
• Blagdon Lake
• Chard Reservoir
• Cheddar Reservoir
• Chew Valley Lake
• Clatworthy Reservoir
• Durleigh reservoir
• Hawkridge Reservoir
• Leigh Reservoir
• Litton Reservoirs
• Luxhay Reservoir
• Nutscale Reservoir
• Otterhead Lakes
• Sutton Bingham Reservoir
• Wimbleball Lake

• Agden Reservoir
• Broadstone Reservoir
• Broomhead Reservoir
• Dale Dyke Reservoir
• Damflask Reservoir
• Elsecar Reservoir
• Harthill Reservoir, feeder for the Chesterfield canal[4]
• Howden Reservoir Western half is in Derbyshire
• Ingbirchworth Reservoir
• Langsett Reservoir
• Midhope Reservoir
• More Hall Reservoir
• Pebley Reservoir (Sheffield)
• Redmires Reservoirs
• Rivelin Dams
• Royd Moor Reservoir
• Scout Dyke Reservoir
• Snailsden Reservoir
• Strines Reservoir
• Ulley Reservoir
• Underbank Reservoir
• Weecher Reservoir
• Wharncliffe Reservoir
• Windleden Reservoirs
• Winscar Reservoir
• Worsbrough Reservoir

• Bathpool Park Lake
• Belvide Reservoir
• Betley Hall Reservoir
• Blithfield Reservoir
• Bromley Mill Pool
• Brookleys Lake
• Canwell Estate Reservoir
• Chasewater
• Gailey Reservoir
• Gap Pool
• Hales Hall Pool
• Hatherton Reservoir
• Hanch Reservoir
• Holly Bush Lake
• Knypersley Reservoir
• Minster Pool
• Rudyard Lake
• Stowe Pool
• Swinfen Lake
• Tixall Park Pool
• Trentham Gardens Lake
• Tittesworth Reservoir

• Bessborough Reservoir
• Island Barn Reservoir
• King George VI Reservoir
• Knight Reservoir
• Molesey Reservoirs
• Queen Elizabeth II Reservoir
• Queen Mary Reservoir
• Queen Mother Reservoir
• Staines Reservoirs
• Wraysbury Reservoir

• Draycote Water
• Napton Reservoir, Grand Union Canal[5]
• Oldbury Reservoir
• Packington Lakes, Grand Union Canal
• Shustoke Reservoirs
• Stockton Reservoir, Grand Union Canal
• Wormleighton Reservoir

• Bartley Reservoir (Birmingham)
• Brookvale Park Lake (Birmingham)
• Edgbaston Reservoir (Birmingham)
• Frankley Reservoir (Birmingham)
• Lifford Reservoir (Birmingham)
• Netherton Reservoir, Dudley
• Olton Reservoir, Solihull
• Perry Barr Reservoir (covered) (Birmingham)
• Witton Lakes (Birmingham)
• see also Elan Valley Reservoirs (Wales) which were built by, and supply, Birmingham

• Ardsley Reservoir
• Baitings Reservoir
• Bilberry Reservoir
• Blackmoorfoot Reservoir
• Black Moss Reservoir
• Blakeley Reservoir
• Booth Dean Upper Reservoir
• Booth Dean Lower Reservoir
• Booth Wood Reservoir
• Boshaw Whams Reservoir
• Brownhill Reservoir
• Butterley Reservoir
• Chelker Reservoir
• Cupwith Reservoir
• Dean Head Upper Reservoir
• Dean Head Lower Reservoir
• Dean Head Reservoir
• Deer Hill Reservoir
• Digley Reservoir
• Doe Park Reservoir
• Eccup Reservoir
• Eldwick Reservoir
• Elslack Reservoir
• Gorple Lower Reservoir
• Gorple Upper Reservoir
• Graincliffe Reservoir
• Green Withens Reservoir
• Hewenden Reservoir
• Holme Styes Reservoir
• Keighley Moor Reservoir
• Leeming Reservoir
• Leeshaw Reservoir
• Lower Laithe Reservoir
• March Ghyll Reservoir
• March Hey Reservoir
• Mixenden Reservoir
• Ogden Reservoir
• Panorama Reservoir
• Ponden Reservoir
• Ramsden Reservoir
• Redbrook Reservoir
• Reva Reservoir
• Riding Wood Reservoir
• Ringstone Edge Reservoir
• Ryburn Reservoir
• Scammonden Reservoir
• Silsden Reservoir
• Stubden Reservoir
• Sunnydale Reservoir
• Swellands Reservoir
• Thornton Moor Reservoir
• Walshaw Dean Reservoirs
• Warland Reservoir (Mostly in West Yorkshire, partly in Greater Manchester)
• Warley Moor Reservoir
• Weecher Reservoir
• Wessenden Reservoir
• Wessenden Head Reservoir
• Widdop Reservoir
• Yateholme Reservoir

• Braeside Reservoir
• Cattofield Reservoir
• Mannofield Reservoir
• Slopefield Reservoir
• Smithfield Reservoir

• Bluehills Reservoir
• Clochandighter Reservoir
• Garlogie Dam
• Inchgarth Reservoir - Cults
• Loch of Aboyne
• Loch Saugh
• Silver Dam aka Culter Compensation Dam

• Backwater Reservoir
• Brewlands Reservoir
• Crombie Reservoir
• Den of Ogil
• Glenogil
• Kinnaird Lake
• Ledcrieff Loch
• Linrathen
• Linrathen Clear Water Storage
• Loch Auchintaple or Auchintaple Loch
• Loch Lee
• Loch Shandra
• Long Loch
• Monikie Clear Water Basin
• Monikie North Pond
• Monikie South (Island) Pond
• Piperdam Loch

• Allt na Lairige - Glen Fyne
• Ardlussa Fishing Loch - Isle of Jura
• Asgog Loch - Tighnabruaich
• Aucha Lochy - Campbeltown
• Auchengaich Reservoir - Glen Fruin
• Beochlich - 9 km NW of Inveraray
• Bishop's Glen Reservoir (also known as Dunoon Reservoir) - Dunoon
• Blackmill Loch - Minard
• Cam Loch - North Knapdale
• Craignafeich Reservoirs - Tighnabruaich
• Crarae Reservoir - Minard
• Crosshill Loch - Campbeltown
• Cruachan Reservoir - Loch Awe
• Daill Loch - North Knapdale
• Dhu Loch - Bute
• Feorlin - Minard
• Gleann Dubh - Barcaldine
• Gleann Loch - North Knapdale
• Helensburgh No. 1 Reservoir - Helensburgh
• Helensburgh No. 2 Reservoir - Helensburgh
• Kilduskland Reservoir - Ardrishaig
• Kirk Dam - Bute
• Knockruan Loch - Campbeltown
• Leorin Loch - Port Ellen, Islay
• Lindowan Reservoir - Kilcreggan
• Loch A' Bharain - North Knapdale
• Loch A' Chaorainn - South Knapdale
• Loch Allan - Port Askaig, Islay
• Loch a'Mhuillin - North Knapdale
• Loch an Add - North Knapdale
• Loch an Droighinn - Kilchrenan
• Loch an Sgoltaire - Isle of Colonsay
• Loch an Torr - Dervaig, Isle of Mull
• Loch Ascog - Isle of Bute
• Loch Assapol - Bunessan, Isle of Mull
• Loch Awe - part of the Awe hydroelectric scheme
• Loch Ba - Gruline, Isle of Mull
• Loch Bearnoch - Lochdon, Isle of Mull
• Loch Beinn Uraraidh - Port Ellen, Islay
• Loch Cam - Bridgend, Isle of Islay
• Loch Chaorunn - South Knapdale
• Loch Ciaran - Clachan, North Kintyre
• Loch Clachaig - North Knapdale
• Loch Eck - Cowal
• Loch Fad - Bute
• Loch Finlas - 4 km SW Luss
• Loch Gearach - Port Charlotte, Islay
• Loch Glashan - Lochgair, Mid-Argyll
• Loch Gleann - Oban
• Loch Iarnan - Port Ellen, Islay
• Loch Leacann - Furnace
• Loch Lebdgei (Dubh Loch) - North Knapdale
• Loch Lebgei - North Knapdale
• Loch Na Bric - North Knapdale
• Loch na Creige Crainde - North Knapdale
• Loch Na Faoilinn - North Knapdale
• Loch Na Sreinge - 9 km NE of Kilmelford
• Loch Nam Ban - Port Askaig, Islay
• Loch Nam Breac Buidhe - North Knapdale
• Loch Nan Torran - South Knapdale
• Loch Righeachan - Inveraray
• Loch Skerrols - Bridgend, Isle of Islay
• Loch Sloy (Reservoir) - 6 km N of Arrochar
• Loch Tarsan - Glen Lean, Cowal
• Loch Tralaig - Kilmelford
• Loch Turamin (New Loch) - Isle of Colonsay
• Loch Uigeadail - Port Ellen, Islay
• Lochan A' Ghurrabain - Tobermory, Isle of Mull
• Lochan Duin - North Knapdale
• Lochan Ghlas - Garelochhead
• Lochan Gleann Astaile - Isle of Jura
• Lochan Lasgainn Mor - Kilmelford
• Lower Glen Shira - 12 km NE of Inveraray
• Luachrach Loch - Oban
• Main Glen Shira - 13 km NE of Inveraray
• Mishnish Lochs - Tobermory, Isle of Mull
• Nant Reservoir - Kilchrenan
• Oude Reservoir - Kilmelford
• Powder Mill Dam - Tighnabruaich
• Sholum Lochs - Port Ellen, Islay
• Still Loch - Ardrishaig
• Strathduie Water - Campbeltown

• Carsfad Loch
• Clatteringshaws Loch
• Glenkiln Reservoir
• Kettleton Reservoir
• Black Esk Dam
• Winterhope Reservoir

• Afton Reservoir
• Corsehouse Reservoir
• Craigendunton Reservoir
• Glenbuck Loch
• Loch Finlas

• Balgray Reservoir
• Littleton Reservoir
• Ryat Linn Reservoir
• Waulkmill Glen Reservoir
• Walton Dam
• Glanderston Dam
• Snypes Dam
• Kirkton Dam
• Harelaw Reservoir, Fereneze Golf Course
• Harelaw Reservoir, Eaglesham Moor
• Rouken Glen Pond
• Craighall Reservoir
• Commore Dam
• White Loch
• Black Loch
• Brother Loch
• Little Loch
• Pilmuir Reservoir
• Loch Craig
• Bennan Loch
• Corsehouse Reservoir (on the border with East Ayrshire)
• Long Loch
• Loch Goin
• Dunwan Loch
• High Dam
• Picketlaw Reservoir
• Caplaw Dam (on the border with Renfrewshire)
• Netherplace Reservoir (at the dye works)
• Glenburn Reservoir

• Clubbiedean Reservoir
• Harlaw Reservoir
• Threipmuir Reservoir
• Torduff Reservoir
• Bonaly Reservoir

• Ballo Reservoir
• Clatto Reservoir
• Cameron Reservoir
• Castlehill Reservoir
• Drumain Reservoir
• Holl Reservoir
• Harperleas Reservoir
• Stenhouse Loch
• Carriston Reservoir
• Donald Rose Reservoir
• Carlhurlie Reservoir

• Blackwater Reservoir, near Kinlochleven
• Clunas Reservoir
• Loch Benevean
• Loch Laggan and Loch Treig - both part of the Lochaber hydroelectric scheme
• Loch Monar - part of the Strathfarrar hydroelectric scheme
• Loch Quoich and Loch Garry - both part of the Glen Garry hydroelectric scheme
• Loch Loyne and Loch Cluanie - both part of the Glen Moriston hydroelectric scheme
• Loch Mullardoch - part of the Glen Affric hydroelectric scheme
• Loch Glascarnoch

• Edgelaw Reservoir
• Gladhouse Reservoir
• Glencorse Reservoir
• North Esk Reservoir
• Rosebery Reservoir
• Loganlea Reservoir

• Auldmuir Reservoir
• Barcraigs Reservoir
• Busbie Muir Reservoir
• Caaf Reservoir
• Camphill Reservoir
• Cuffhill Reservoir
• Glenburn Reservoir
• Kelly Reservoir
• Knockendon Reservoir
• Kirkleegreen Reservoir
• Mill Glen Reservoir
• Muirhead Reservoir
• Munnoch Reservoir
• Outerwards Reservoir
• Skelmorlie Lower Reservoir
• Skelmorlie Upper Reservoir

• Birkenburn
• Broadwood Loch
• Daer
• Dalmacoulter
• Forrestburn
• Glenhove No. 1
• Glenhove No. 2
• Hillend Loch
• Lilly Loch
• Roughrigg
• Strathclyde Park
• Townhead Reservoir
• West Corrie

• Dunalastair Water
• Loch Tummel - part of the Tummel Valley hydroelectric scheme
• Loch Turret Reservoir and Glenturret Dam. Near Crieff
• Lower Glendevon Reservoir
• Upper Glendevon Reservoir

• Alemoor Loch
• Baddinsgill Reservoir
• Fruid Reservoir
• Megget Reservoir
• Talla Reservoir
• Westwater Reservoir

• Bradan Service Reservoir
• Collenan
• Glendrissaigh
• Loch Bradan
• Loch Riecawr
• Loch Spallander
• Loch Spouts
• Penwhapple
• Raith

• Cochno Loch
• Jaw Reservoir
• Greenside Reservoir
• Carman Reservoir
• Kilmannan Reservoir (on the border with Stirling)
• Burncrooks Reservoir (on the border with Stirling)

• Llyn Bodgynydd - supply for the Pandora lead mine (disused)
• Llyn Brenig - part of Dee Regulation system - also in Denbighshire
• Llyn Coedty - water supply for Dolgarrog hydroelectric station
• Llyn Conwy - water supply for Llanrwst and Betws-y-Coed
• Llyn Cowlyd - water supply for Conwy and Colwyn Bay and for Dolgarrog hydroelectric station
• Llyn Crafnant - water supply for Llanrwst
• Llyn Dulyn - water supply for Llandudno
• Llyn Melynllyn - water supply for Llandudno
• Llyn Parc - supply for the Aberllyn mine (disused)
• Llyn Elsi - water supply for Betws-y-Coed (disused)

• Aled Isaf Reservoir
• Alwen Reservoir
• Llyn Aled
• Llyn Alwen
• Llyn Brenig - part of the River Dee regulation system
• Llyn Celyn - part of the River Dee regulation system.
• Pendinas Reservoir
• Bala Lake (Llyn Tegid)
• Nant-y-Ffrith Reservoir

• Llyn Anafon - water supply for Llanfairfechan, Dwygyfylchi and Penmaenmawr
• Llyn Arenig Fach
• Llyn Arenig Fawr - water supply for Bala town
• Llynnau Barlwyd - supply to Llechwedd slate quarry
• Llyn Bodlyn - water supply to Barmouth.
• Llyn Bowydd - supply to the Blaenau Ffestiniog slate quarries
• Llyn Cwm Corsiog - supply for Rhosydd slate quarry (disused)
• Llyn Cwellyn - water supply to Bangor and parts of south Anglesey
• Marchlyn Mawr - header reservoir for the Dinorwig power station hydroelectric system.
• Llyn Peris
• Llyn Padarn - part of the Dinorwig hydroelectric system
• Llyn Stwlan - built for the hydroelectric Ffestiniog Power Station
• Llyn Trawsfynydd - built for the Maentwrog hydroelectric Power Station

• Taff Fawr reservoirs- a chain of three reservoirs supplying the Rhondda and Taff valley and Cardiff with water
  • Beacons Reservoir
  • Cantref Reservoir
  • also see Llwyn-on Reservoir in Merthyr Tydfil
• Taff Fechan reservoirs - a chain of four reservoirs also supplying the Taff valley and Cardiff with water
  • Upper Neuadd Reservoir
  • Lower Neuadd Reservoir
  • Doly y gaer Reservoir[9]
  • Pontsticill Reservoir
• Elan Valley Reservoirs - a group of reservoirs supplying Birmingham and parts of the West Midlands conurbation with drinking water
  • Claerwen Reservoir
  • Craig-goch Reservoir
  • Penygarreg Reservoir
  • Garreg-ddu Reservoir
  • Caban-coch Reservoir
• Lake Vyrnwy (Llyn Efyrnwy) - supplies water to the Liverpool area
• Talybont Reservoir
• Ystradfellte Reservoir
• Clywedog Reservoir (Llyn Clywedog)