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Reservoir levels in Wales
How full the reservoirs in Wales are, as each water company publishes it. 13 of the figures below are current (reported in the last 21 days).
There is no single figure for Wales: the companies report on different days and in different ways, so each is shown as published.
Reservoir levels are about water supply, not flood risk.
Dŵr Cymru Welsh Water, which runs most of Wales's reservoirs, has published no levels since
9 Dec 2024. Its figures are shown below, clearly dated. Natural Resources Wales
receives a weekly copy, but
its catalogue entry
marks it for internal use only and not for re-use, so it cannot be shown here.
The last twelve months
0% 25% 50% 75% 100% Dec Feb Apr Jun Aug Oct Hafren Dyfrdwy Hafren Dyfrdwy: 49.3% on 26 Oct 2026 Clywedog Clywedog: 67.0% on 2 Nov 2026 Elan Valley Elan Valley: 68.3% on 2 Nov 2026 Elan Valley 68% Clywedog 67% Hafren Dyfrdwy 49% Percent full, as each company published it week by week. Welsh Water has no line: it has published nothing since 9 Dec 2024.
Where they are
Hafren Dyfrdwy
49.3% full
— Hafren Dyfrdwy’s own published figure, as of 26 Oct 2026.
49.3%
—
As of 26 Oct 2026
27.9%
176 Ml
As of 26 Oct 2026
61.8%
49,936 Ml
As of 26 Oct 2026
51.2%
296 Ml
As of 26 Oct 2026
96.8%
139 Ml
As of 26 Oct 2026
0.0%
103 Ml
As of 26 Oct 2026
100.0%
39 Ml
As of 26 Oct 2026
72.2%
102 Ml
As of 26 Oct 2026
41.8%
283 Ml
As of 26 Oct 2026
46.6%
578 Ml
As of 26 Oct 2026
48.5%
606 Ml
As of 26 Oct 2026
43.9%
782 Ml
As of 26 Oct 2026
Hafren Dyfrdwy reservoir levels →
Published by English water companies
Reservoirs that stand in Wales but are reported by an English company. Hafren Dyfrdwy also publishes a
Clywedog figure, shown in its own section; the two companies report on different days. Severn Trent's Elan Valley
figure covers the Elan Valley reservoirs, which supply Birmingham; Welsh Water's own Elan Valley row is the older one.
67.0%
49,936 Ml
As of 2 Nov 2026
68.3%
99,500 Ml
As of 2 Nov 2026
Dŵr Cymru Welsh Water
59 reservoirs, last reported 9 Dec 2024
98.6%
6,961 Ml
Last reported 9 Dec 2024
96.0%
1,726 Ml
Last reported 9 Dec 2024
64.1%
0 Ml
Last reported 9 Dec 2024
15.5%
1,136 Ml
Last reported 9 Dec 2024
71.2%
13,619 Ml
Last reported 9 Dec 2024
100.0%
1,629 Ml
Last reported 9 Dec 2024
100.0%
1,574 Ml
Last reported 9 Dec 2024
69.7%
—
Last reported 9 Dec 2024
61.1%
1,205 Ml
Last reported 9 Dec 2024
100.0%
439 Ml
Last reported 9 Dec 2024
98.6%
62,639 Ml
Last reported 9 Dec 2024
100.0%
1,272 Ml
Last reported 9 Dec 2024
100.0%
72 Ml
Last reported 9 Dec 2024
100.0%
1,636 Ml
Last reported 9 Dec 2024
54.8%
80,930 Ml
Last reported 9 Dec 2024
100.0%
721 Ml
Last reported 9 Dec 2024
100.0%
10,889 Ml
Last reported 9 Dec 2024
74.8%
4,202 Ml
Last reported 9 Dec 2024
87.4%
1,687 Ml
Last reported 9 Dec 2024
100.0%
634 Ml
Last reported 9 Dec 2024
100.0%
214 Ml
Last reported 9 Dec 2024
98.5%
2,910 Ml
Last reported 9 Dec 2024
79.7%
678 Ml
Last reported 9 Dec 2024
100.0%
213 Ml
Last reported 9 Dec 2024
66.4%
0 Ml
Last reported 9 Dec 2024
86.1%
2,078 Ml
Last reported 9 Dec 2024
66.8%
1,416 Ml
Last reported 9 Dec 2024
61.3%
334 Ml
Last reported 9 Dec 2024
43.0%
23,650 Ml
Last reported 9 Dec 2024
75.4%
1,305 Ml
Last reported 9 Dec 2024
85.4%
1,198 Ml
Last reported 9 Dec 2024
99.7%
4,834 Ml
Last reported 9 Dec 2024
96.5%
62,304 Ml
Last reported 9 Dec 2024
100.0%
356 Ml
Last reported 9 Dec 2024
79.5%
995 Ml
Last reported 9 Dec 2024
94.9%
880 Ml
Last reported 9 Dec 2024
100.0%
395 Ml
Last reported 9 Dec 2024
94.0%
1,083 Ml
Last reported 9 Dec 2024
90.6%
10,242 Ml
Last reported 9 Dec 2024
96.2%
795 Ml
Last reported 9 Dec 2024
100.0%
697 Ml
Last reported 9 Dec 2024
95.7%
352 Ml
Last reported 9 Dec 2024
96.6%
349 Ml
Last reported 9 Dec 2024
66.3%
285 Ml
Last reported 9 Dec 2024
86.8%
570 Ml
Last reported 9 Dec 2024
84.3%
14,729 Ml
Last reported 9 Dec 2024
100.0%
57 Ml
Last reported 9 Dec 2024
99.1%
171 Ml
Last reported 9 Dec 2024
100.0%
644 Ml
Last reported 9 Dec 2024
99.6%
339 Ml
Last reported 9 Dec 2024
99.8%
0 Ml
Last reported 9 Dec 2024
84.3%
14,729 Ml
Last reported 9 Dec 2024
70.0%
11,245 Ml
Last reported 9 Dec 2024
78.0%
619 Ml
Last reported 9 Dec 2024
99.6%
338 Ml
Last reported 9 Dec 2024
95.4%
831 Ml
Last reported 9 Dec 2024
80.6%
13,092 Ml
Last reported 9 Dec 2024
8.4%
1,880 Ml
Last reported 9 Dec 2024
100.0%
2,150 Ml
Last reported 9 Dec 2024
Dŵr Cymru Welsh Water reservoir levels →
Rain behind the levels
How the last 3, 6 and 12 months of rain in Wales compare with the 1991–2020 average, and every
Welsh rain gauge's own figure: rainfall in Wales . River levels, warnings and more:
Wales .
