Receiving watercourse
Severn Estuary
19 monitored storm overflows on the Severn Estuary are listed in the National Storm Overflow Hub. Operated by Dwr Cymru Welsh Water and Wessex Water.
This watercourse is part of our featured River Severn coverage — that page aggregates the whole river, including tributaries and estuary stretches.
19
Storm overflows
0
Active right now
0
Monitors offline
291
Spill events · 12 months
3,814h
Recorded discharge · 12 months
0
Open discrepancies
Every monitored overflow· 19
Each links to its full record — spill history, nearby water-quality sampling, citizen reports, and pre-filled accountability letters.
- WXW00300Wessex Waterinactive
- Barry Town Long Sea Storm OverflowDwr Cymru Welsh Waterinactive
- Penarth Head Storm OverflowDwr Cymru Welsh Waterinactive
- Caldicot Storm OverflowDwr Cymru Welsh Waterinactive
- Machen Close St Mellons Storm OverflowDwr Cymru Welsh Waterinactive
- Cardiff Eastern Short Sea Outfall Storm OverflowDwr Cymru Welsh Waterinactive
- WXW00096Wessex Waterinactive
- Cardiff Eastern Long Sea Outfall Storm OverflowDwr Cymru Welsh Waterinactive
- WXW00875Wessex Waterinactive
- Magor Storm OverflowDwr Cymru Welsh Waterinactive
- WXW00140Wessex Waterinactive
- Barry Town Short Sea Storm OverflowDwr Cymru Welsh Waterinactive
- WXW01300Wessex Waterinactive
- Western Valley LG Tanks Storm OverflowDwr Cymru Welsh Waterinactive
- Ocean Park Storm OverflowDwr Cymru Welsh Waterunknown
- Sanderling Close Storm OverflowDwr Cymru Welsh Waterinactive
- WXW01136Wessex Waterinactive
- Cardiff Central Storm OverflowDwr Cymru Welsh Waterinactive
- Penarth Marina Storm OverflowDwr Cymru Welsh Waterunknown
Seen something?
Sewage debris, foam, dead fish — citizen sightings are cross-referenced against the official discharge data above and strengthen the public record.