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Dŵr Cymru Welsh Water reservoir levels

We have no current figures for Dŵr Cymru Welsh Water. The most recent levels we hold were reported 9 Dec 2024. They are shown below, clearly dated, until Dŵr Cymru Welsh Water publishes again.

Every Dŵr Cymru Welsh Water reservoir we track

Alaw

98.6%

6,961 Ml

Last reported 9 Dec 2024

Aled

96.0%

1,726 Ml

Last reported 9 Dec 2024

Aled Combined

64.1%

0 Ml

Last reported 9 Dec 2024

Aled Isaf

15.5%

1,136 Ml

Last reported 9 Dec 2024

Alwen

71.2%

13,619 Ml

Last reported 9 Dec 2024

Arenig

100.0%

1,629 Ml

Last reported 9 Dec 2024

Beacons

100.0%

1,574 Ml

Last reported 9 Dec 2024

Big Five Agg.

69.7%

0 Ml

Last reported 9 Dec 2024

Blaen y Cwm

61.1%

1,205 Ml

Last reported 9 Dec 2024

Bodlyn

100.0%

439 Ml

Last reported 9 Dec 2024

Brenig

98.6%

62,639 Ml

Last reported 9 Dec 2024

Cantref

100.0%

1,272 Ml

Last reported 9 Dec 2024

Castell Nos

100.0%

72 Ml

Last reported 9 Dec 2024

Cefni

100.0%

1,636 Ml

Last reported 9 Dec 2024

Celyn

54.8%

80,930 Ml

Last reported 9 Dec 2024

Conwy

100.0%

721 Ml

Last reported 9 Dec 2024

Cowlyd

100.0%

10,889 Ml

Last reported 9 Dec 2024

Crai Reservoir

74.8%

4,202 Ml

Last reported 9 Dec 2024

Cwellyn

87.4%

1,687 Ml

Last reported 9 Dec 2024

Cwm Dulyn

100.0%

634 Ml

Last reported 9 Dec 2024

Cwmtillery

100.0%

214 Ml

Last reported 9 Dec 2024

Cwmystradllyn

98.5%

2,910 Ml

Last reported 9 Dec 2024

Cynwch

79.7%

678 Ml

Last reported 9 Dec 2024

Eiddew

100.0%

213 Ml

Last reported 9 Dec 2024

Elan Valley

66.4%

0 Ml

Last reported 9 Dec 2024

Ffynnon Llugwy

86.1%

2,078 Ml

Last reported 9 Dec 2024

Grwyne Fawr

66.8%

1,416 Ml

Last reported 9 Dec 2024

Lisvane

61.3%

334 Ml

Last reported 9 Dec 2024

Llandegfedd

43.0%

23,650 Ml

Last reported 9 Dec 2024

Llanishen

75.4%

1,305 Ml

Last reported 9 Dec 2024

Lluest Wenn

85.4%

1,198 Ml

Last reported 9 Dec 2024

Llwynon

99.7%

4,834 Ml

Last reported 9 Dec 2024

Llyn Brianne

96.5%

62,304 Ml

Last reported 9 Dec 2024

Llyn Craig y Pistyll

100.0%

356 Ml

Last reported 9 Dec 2024

Llyn Egnant

79.5%

995 Ml

Last reported 9 Dec 2024

Llyn Fawr

94.9%

880 Ml

Last reported 9 Dec 2024

Llyn Llygad Rheidol

100.0%

395 Ml

Last reported 9 Dec 2024

Llyn Teifi

94.0%

1,083 Ml

Last reported 9 Dec 2024

Llys y Fran

90.6%

10,242 Ml

Last reported 9 Dec 2024

Lower Carno

96.2%

795 Ml

Last reported 9 Dec 2024

Lower Lliedi Reservoir

100.0%

697 Ml

Last reported 9 Dec 2024

Marchlyn

95.7%

352 Ml

Last reported 9 Dec 2024

Morwynion

96.6%

349 Ml

Last reported 9 Dec 2024

Nant Moel

66.3%

285 Ml

Last reported 9 Dec 2024

Penderyn

86.8%

570 Ml

Last reported 9 Dec 2024

Pontsticill

84.3%

14,729 Ml

Last reported 9 Dec 2024

Rhymney Bridge 1

100.0%

57 Ml

Last reported 9 Dec 2024

Rhymney Bridge 2

99.1%

171 Ml

Last reported 9 Dec 2024

Rosebush Reservoir

100.0%

644 Ml

Last reported 9 Dec 2024

Shon Sheffrey

99.6%

339 Ml

Last reported 9 Dec 2024

Taf Fawr

99.8%

0 Ml

Last reported 9 Dec 2024

Taf Fechan

84.3%

14,729 Ml

Last reported 9 Dec 2024

Talybont

70.0%

11,245 Ml

Last reported 9 Dec 2024

Tecwyn

78.0%

619 Ml

Last reported 9 Dec 2024

Upper Carno

99.6%

338 Ml

Last reported 9 Dec 2024

Upper Lliedi Reservoir

95.4%

831 Ml

Last reported 9 Dec 2024

Usk Reservoir

80.6%

13,092 Ml

Last reported 9 Dec 2024

Wentwood

8.4%

1,880 Ml

Last reported 9 Dec 2024

Ystradfellte Reservoir

100.0%

2,150 Ml

Last reported 9 Dec 2024

Compare with

Northumbrian Water → Severn Trent Water →

Where this comes from. Reservoir data © the UK water companies, from their published reservoir-level reports and the Stream water-industry open data portal (CC BY 4.0). Thames Water London history via the London Datastore (Open Government Licence v2). Figures are exactly as published by Dŵr Cymru Welsh Water — reporting day and rounding are theirs, so "as of" dates differ row to row. Levels older than 21 days are marked "last reported" rather than treated as current.

Reservoir facts (coordinates, capacity, type, purpose, construction date and downstream gauge) from the UK Reservoir Inventory. Contains data supplied by UK Centre for Ecology & Hydrology (Durant & Counsell, 2018, Open Government Licence v3.0).