Top of the Poops | Constituency Sewage Map - Live Data| Cardiff South and Penarth

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You're looking at the totals that we have calculated for sewage in Cardiff South and Penarth so far for 2026. It is an estimate, based on very poor quality live data from the Water Companies. The water companies report their sewage to the Environment Agency every year in April. You can see the last reported year in the other page

What's a potential overflow? If the CSO goes 'Offline' while its Overflowing, we don't know if it stopped overflowing until we get a 'Stop' event.

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Company	Site Name	Receiving Waterway	Overflow Days	Total Duration (hours)	Offline/Potential Pollution
Dwr Cymru Welsh Water	Cardiff Central Storm Overflow	Severn Estuary	32	221 h 45m	-
Dwr Cymru Welsh Water	Stonylands Storm Overflow	Sully Brook	16	107 h 35m	-
Dwr Cymru Welsh Water	Penarth Head Storm Overflow	Severn Estuary	16	44 h 28m	-
Dwr Cymru Welsh Water	Cardiff Eastern Short Sea Outfall Storm Overflow	Severn Estuary	13	34 h 45m	-
Dwr Cymru Welsh Water	Cardiff Eastern Long Sea Outfall Storm Overflow	Severn Estuary	13	34 h 45m	-
Dwr Cymru Welsh Water	Cardiff Western District Storm Overflow	River Ely	5	31 h 15m	-
Dwr Cymru Welsh Water	Brockhill Rise Storm Overflow	Bristol Channel	10	27 h 45m	-
Dwr Cymru Welsh Water	Penarth Kymin Storm Overflow	Bristol Channel	5	10 h 19m	-
Dwr Cymru Welsh Water	St Cadoc's Avenue Dinas Powys Storm Overflow	Cadoxton River	4	9 h 27m	-
Dwr Cymru Welsh Water	Grangetown Storm Overflow	River Taff	2	5 h 30m	-
Dwr Cymru Welsh Water	Sully Moors Road Storm Overflow	Tributary of Sully Brook	1	1 h 30m	-
Dwr Cymru Welsh Water	Havelock Street Cardiff Storm Overflow	River Taff	1	1 h 14m	-
Dwr Cymru Welsh Water	Penarth Road Storm Overflow	River Ely	3	1 h 5m	-
Dwr Cymru Welsh Water	Harrowby Street Storm Overflow	River Taff Estuary	1	0 h 45m	-
Dwr Cymru Welsh Water	Park Street Cardiff Storm Overflow	River Taff	1	0 h 15m	-
Dwr Cymru Welsh Water	Ocean Park Storm Overflow	Severn Estuary	0	0 h	-
Dwr Cymru Welsh Water	Penarth Marina Storm Overflow	Severn Estuary	0	0 h	-
Dwr Cymru Welsh Water	Maple Road Storm Overflow	Culvert to a Tributary of Sully Brook	0	0 h	-
Dwr Cymru Welsh Water	Countess Place Penarth Overflow	The Sully Brook	0	0 h	-
Dwr Cymru Welsh Water	Penarth Cogan Storm Overflow	River Ely Estuary	0	0 h	-
Dwr Cymru Welsh Water	Argae Lane Storm Overflow	Culvert Leading to Coldbrook	0	0 h	-
Dwr Cymru Welsh Water	Cornerswell Road Penarth Storm Overflow	The Sully Brook	0	0 h	-
Dwr Cymru Welsh Water	Cogan Flooding Relief Storm Overflow	River Ely via Cowslip	0	0 h	-
Dwr Cymru Welsh Water	Cog Moors WwTW Storm Overflow	Coastal Waters - Lavernock Point	0	0 h	-
Dwr Cymru Welsh Water	Unknown	Unknown	0	0 h	-

It's a Dirty Business

Cardiff South and Penarth - Live Sewage

Polluted by sewage 532 hours in 2026 so far..

Cardiff South and Penarth - Live Sewage

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It's a Dirty Business

Cardiff South and Penarth - Live Sewage Polluted by sewage 532 hours in 2026 so far..

Cardiff South and Penarth - Live Sewage

Which Year?

Select Another Constituency

View Annual Sewage Data

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Constituencies near Cardiff South and Penarth

Daily Data

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Totals so far

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Cardiff South and Penarth - Live Sewage

Polluted by sewage 532 hours in 2026 so far..