Dwr Cymru Welsh Water

Welsh Water — serves 3 million people across most of Wales and parts of Herefordshire. Major rivers: Wye, Usk, Tawe, Teifi, Conwy. Regulated by Natural Resources Wales rather than the Environment Agency.

Dwr Cymru Welsh Water operates 2,336 monitored storm overflows. 3 are currently spilling. In the last 30 days the network has discharged a cumulative 6 weeks across 1,560 events on average. The Truth Engine has 5 open flags against them right now.

📍 View on national map →📄 Download Truth Report (PDF)⬇ Overflows · CSV

2,336

Storm overflows

Active right now

Monitors offline

Open flags

390

Spills · last 7 days

6 weeks

Cumulative discharge · 30 days

1.1 h

Avg event length · 30 days

Spills · last 24 hours

Most-discharged-into watercourses

The 12 watercourses with the most Dwr Cymru Welsh Water overflows discharging into them.

River Dee56 overflows
River Taff54 overflows
Afon Lwyd46 overflows
River Wye45 overflows
River Cynon43 overflows
Unnamed Watercourse41 overflows
River Ebbw38 overflows
River Teifi37 overflows
River Rhymni37 overflows
Menai Strait36 overflows
River Tawe33 overflows
Sirhowy River28 overflows

Dwr Cymru Welsh Water

Most-discharged-into watercourses

Currently spilling· 3

River Alaw

Nant Cledlyn

Tributary of Afon Marlais

Truth Engine flags against Dwr Cymru Welsh Water· 5 open