Top of the Poops | Constituency Sewage Map | Swansea West

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Live data for Swansea West in 2026

So far this year (as of 15 Aug 2026, 07:16) there has been 572 hours of sewage overflows, from 39 CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway s

Totals for Swansea West in 2025

32 Sites polluted by Dwr Cymru Welsh Water

1,010 sewage dumps

4,225 hours duration

That's 5.87 months. On average 2.8 times a day

Change Over Time

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Constituencies near Swansea West

Waterways in Swansea West

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Pollution Summary 2025

Here are all the reported sewage overflow totals for Swansea West in 2025. Sometimes sewage can be being dumped for months at a time.

Reporting refers to how much of the time the monitoring was active. In this constituency all the declared CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway s appeared to have monitoring enabled for more than 50% of the year

Company	Waterway	Site	Sewage Dumps	Duration (Hours)	Reporting %
Dwr Cymru Welsh Water	River Tawe	CSO Ynysforgan Roundabout	81	861	99.9
Dwr Cymru Welsh Water	River Tawe Esturial Waters	OUTFALL 'M' THE TAWE BARRAGE SWANS	68	695	99.9
Dwr Cymru Welsh Water	River Tawe	CSO Ynystawe (Point 86 New Ma)	96	688	97.8
Dwr Cymru Welsh Water	River Tawe	WYCHTREE STREET CSO MORRISTON	79	663	99.9
Dwr Cymru Welsh Water	River Tawe	CSO 70 A4067 Nthbnd Landore Swansea	92	315	99.9
Dwr Cymru Welsh Water	Culvert Of Bwrlais Brook	CWMBWRLA CSO CWMBWRLA RBOUT SWANSEA	53	292	99
Dwr Cymru Welsh Water	Surface Water Sewer To Cwm Gelli Stream	CSO 64A PENLANFACH BRYNHYFRYD	65	145	100
Dwr Cymru Welsh Water	River Llan	Blaenymaes Drive CSO	44	97	99
Dwr Cymru Welsh Water	River Clyne	CSO NO 34 REAR OF FURZELAND DRIVE S	20	75	97.7
Dwr Cymru Welsh Water	Culvert Of Cwm Gelli Stream	BRYNHYFRYD CSO LLANGYFELACH ROAD	54	74	99.9
Dwr Cymru Welsh Water	Estuarial Waters Of Swansea Ba	SWO. NEAR H.M. PRISON (POINT 6	35	67	99.9
Dwr Cymru Welsh Water	Nant Melyn Via The Surface Water Sewer	CSO 73 CROWN ST MORRISTON SWANSEA	53	58	99.3
Dwr Cymru Welsh Water	Culvert Of Burlais Brook	CSO 119 CWM ROAD HAFOD SWANSEA	56	52	99.8
Dwr Cymru Welsh Water	River Llan	Skomer Place CSO, Blaen Y Maes	24	27	99.8
Dwr Cymru Welsh Water	Cwmrhydyceirw Brook Via Surface Water Network	CSO 80 Pentrpoeth Rd Morriston	51	21	100
Dwr Cymru Welsh Water	River Clyne	CSO SKETTY PARK DRIVE SWANSEA ,	12	18	99.9
Dwr Cymru Welsh Water	Nant Cwm Gelli	MYNYDDGARNLLWYD CSO SWANSEA	27	15	99.8
Dwr Cymru Welsh Water	River Llan	Cadleroad Road CSO	21	12	99.6
Dwr Cymru Welsh Water	Nant Cwmgelli Via Surface Water Drains	CSO at Penlan Cresent (Point 52A) Swansea	25	11	99.7
Dwr Cymru Welsh Water	River Llan	Mynydd Newydd Rd CSO	9	7	100
Dwr Cymru Welsh Water	Culvert Of Cwm Gelli Stream	CSO 69 TRWYDDFA ROAD SWANSEA	16	6	99.8
Dwr Cymru Welsh Water	River Llan Via Surface Water Sewer	FFORD-Y-BRAIN/PORT TALBOT PLACE CSO	6	3	99.9
Dwr Cymru Welsh Water	River Llan Via Surface Water Sewer	Cadle Common CSO	2	3	99.9
Dwr Cymru Welsh Water	Swansea Bay	Sketty Green CSO	3	2	100
Dwr Cymru Welsh Water	Brynmill Stream	Singleton Park Point 24 CSO	3	1	99.9
Dwr Cymru Welsh Water	Nant Melyn Via The Surface Water Sewer	CSO 72 Slate St Morriston Swansea	4	1	100
Dwr Cymru Welsh Water	A Culvert Of Burlais Brook	CSO 60 Gors Avenue Swansea	4	1	100
Dwr Cymru Welsh Water	Brynmill Stream	CSO AT GLANBRYDAN AVENUE	2	1	100
Dwr Cymru Welsh Water	Nant Melyn Via The Surface Water Sewer	CSO 81 CWM BATH ROAD MORRISTON	2	0	99.7
Dwr Cymru Welsh Water	River Clyne	CSO NO 21 DERWEN FAWR ROAD SKETTY S	1	0	100
Dwr Cymru Welsh Water	River Tawe	CSO Near Chemical Rd. Morriston	1	0	99.8
Dwr Cymru Welsh Water	Swansea Bay	OUTFALL K (CSO 264) JUN OF MUMBLES	1	0	100
Dwr Cymru Welsh Water	Sea	BRYNYMOR ROAD/WESTBURY RD POINT 28	0	0	100
Dwr Cymru Welsh Water	Cwm Gelli Stream, River Tawe	CSO 69A Heol Nant Gelli Swansea	0	0	96.6

Data Sources & Accuracy

EDM (Event Duration Monitoring) data and Consented Discharges to Controlled Waters with Conditions from Environment Agency & Data Map Wales, and Scottish Water

Experimental derived data from Thames Water API, Some data may be missing or inaccurate. Live sewage data from Stream Water API

Uses Environment Agency rainfall data from the real-time data API (Beta) - Rainfall data is delayed by up to two days.

This website is intended to provide an accurate representation of the Environment Agency data. The data is hard to use, and thus some errors may have been made. If you find something that is incorrect, please raise an issue at the GitHub issues page and we'll endeavour to fix it quickly.

This project is not associated, approved or endorsed by any of the companies whose logos you see here.

Analysing sewage pollution by the Water Industry

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