Abertawe

Polluted by sewage 2,266 times in 2025 lasting 10,228 hours - That's 1.18 years!

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Totals for Abertawe in 2025

73 Sites polluted by Dwr Cymru Welsh Water

2,266 sewage dumps

10,228 hours duration

Sewage pollution map of Abertawe: 10,228 hours in 2025

That's 1.18 years. On average 6.2 times a day

Change Over Time

Constituency for Abertawe

Nearby Constituencies

Waterways in Abertawe

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Pollution Summary 2025

Here are all the reported sewage overflow totals for Abertawe 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 place 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	Inco CSO Clydach Swansea	114	1,083	99.2
Dwr Cymru Welsh Water	Neath Estuary	FABIAN WAY SPS FABIAN WAY SWANSEA	60	974	99.9
Dwr Cymru Welsh Water	River Tawe	CSO Ynysforgan Roundabout	81	861	99.9
Dwr Cymru Welsh Water	River Llan	Cuckoo Mill SPS	48	774	98.1
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	Nant-Bran	Felin Fran CSO Walters Rd Llansamle	58	398	98.1
Dwr Cymru Welsh Water	Nant-Y-Fendrod	Samlet Rd CSO 103	56	353	99
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	River Tawe	Pentrechwyth Rd CSO	58	291	99.4
Dwr Cymru Welsh Water	River Llan	CWMBACH ROAD CSO COCKETT SWANSEA	79	277	98.9
Dwr Cymru Welsh Water	Lower Clydach River	Canal CSO. Towpath Off Hebron Road, Clydach	69	224	99.3
Dwr Cymru Welsh Water	Lower Clydach River	Storm Overflow at Heol Eithrim	51	216	97.5
Dwr Cymru Welsh Water	River Llan	CSO, Denver R’D Into Culvert Swansea	89	150	99.9
Dwr Cymru Welsh Water	Clyne River	Railway Inn SPS, Killay	21	146	99.9
Dwr Cymru Welsh Water	Surface Water Sewer To Cwm Gelli Stream	CSO 64A PENLANFACH BRYNHYFRYD	65	145	100
Dwr Cymru Welsh Water	Nant Bran	PENIEL GREEN CSO PENIEL GREEN ROAD	33	122	99.4
Dwr Cymru Welsh Water	Swansea Bay	OUTFALL A (CSO 201) JUN OF MUMBLES	13	110	97.5
Dwr Cymru Welsh Water	Swansea Bay	Duns Lane/Park street CSO	26	105	99.7
Dwr Cymru Welsh Water	Sea Outfall	BALDWINS CRESCENT SPS	42	102	99.9
Dwr Cymru Welsh Water	Swansea Bay	Swansea Waste Water Treatment Works	10	100	99.9
Dwr Cymru Welsh Water	River Llan	Blaenymaes Drive CSO	44	97	99
Dwr Cymru Welsh Water	Swansea Bay	SWO. NEAR NORTON AVENUE (POINT	71	90	98.9
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	Clyne River	HEN PARC LANE PUMPING STATION	21	69	97.6
Dwr Cymru Welsh Water	Estuarial Waters Of Swansea Ba	SWO. NEAR H.M. PRISON (POINT 6	35	67	99.9
Dwr Cymru Welsh Water	An River Llan	BLAEN Y MAES POINT 65 CSO SWANSEA	36	66	99.8
Dwr Cymru Welsh Water	River Tawe	Bonymaen Rd CSO	52	64	98.4
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	To Crymlyn Brook Via A Surface Water Culvert	Skewen SPS Park Avenue Lonlas Neath	20	57	99.9
Dwr Cymru Welsh Water	River Tawe	Opp 74 Bonymaen Rd CSO, Swansea ,	49	56	98.6
Dwr Cymru Welsh Water	Culvert Of Burlais Brook	CSO 119 CWM ROAD HAFOD SWANSEA	56	52	99.8
Dwr Cymru Welsh Water	Sea Outfall	TEMPORARY INCREASED DIS. FROM	10	30	99.5
Dwr Cymru Welsh Water	River Llan	Skomer Place CSO, Blaen Y Maes	24	27	99.8
Dwr Cymru Welsh Water	Nant-Y-Fendrod	DRUMAU FARM BIRCHGROVE RD P.S. CSO	14	26	99.9
Dwr Cymru Welsh Water	Crymlyn Bog	CSO HALFWAY CRYMLYN ROAD PS	12	26	95.6
Dwr Cymru Welsh Water	Cwmrhydyceirw Brook Via Surface Water Network	CSO 80 Pentrpoeth Rd Morriston	51	21	100
Dwr Cymru Welsh Water	Nant Bran Via Culverted Watercourse	Heol Dulais CSO at Birchgrove	11	20	99.5
Dwr Cymru Welsh Water	River Clyne	CSO SKETTY PARK DRIVE SWANSEA ,	12	18	99.9
Dwr Cymru Welsh Water	River Llan	Station Road CSO, Pen Y Cwm Swansea	32	18	98.5
Dwr Cymru Welsh Water	Nant Cwm Gelli	MYNYDDGARNLLWYD CSO SWANSEA	27	15	99.8
Dwr Cymru Welsh Water	Nant Bran Via Culvert	Trallwyn Community Centre CSO	31	14	95.2
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	Swansea Bay	OUTFALL D1 (CSO 10) JUN OF MUMBLES	11	5	99.9
Dwr Cymru Welsh Water	Nant Bran	Adj 27 Bethel Rd Llansamlet CSO	5	4	91.7
Dwr Cymru Welsh Water	Surface Water Culvert, An Nant Bran	Birchgrove Road CSO	9	4	95.9
Dwr Cymru Welsh Water	Washinghouse Brook	ELMGROVE ROAD CSO	3	3	99.9
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	FAIRWOOD RD/LYNDEN TREE P H SWANSEA	9	2	98.5
Dwr Cymru Welsh Water	Estuarial Waters Of Swansea Ba	SWO. QUEENS DOCK (POINT 92 NEW	10	2	99.9
Dwr Cymru Welsh Water	Swansea Bay	Sketty Green CSO	3	2	100
Dwr Cymru Welsh Water	River Llan	Camarthen Rd CSO	3	1	99.8
Dwr Cymru Welsh Water	Brynmill Stream	Singleton Park Point 24 CSO	3	1	99.9
Dwr Cymru Welsh Water	Limeslade Bay	LIMESLADE PUMPING STATION SWANSEA	5	1	99.8
Dwr Cymru Welsh Water	Nant Y Fendrod - Headwaters To Conf With Tawe	Birchgrove CSO	4	1	99.8
Dwr Cymru Welsh Water	Nant Melyn Via The Surface Water Sewer	CSO 72 Slate St Morriston Swansea	4	1	100
Dwr Cymru Welsh Water	Langland Bay	LANGLAND SPS LANGLAND SWANSEA	3	1	100
Dwr Cymru Welsh Water	River Tawe	Heol Y Nant/Sybil Street Clydach CSO	4	1	79.2
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	Swansea Bay	Storm Overflow at Outfall G via CSO 16	2	0	100
Dwr Cymru Welsh Water	Swansea Bay	OUTFALL E (CSO 14) JUN OF MUMBLES R	2	0	99.8
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	Caswell Bay	CASWELL BAY CAR PARK SPS CASWELL	0	0	99.7
Dwr Cymru Welsh Water	River Llan	Kingsway CSO	0	0	85
Dwr Cymru Welsh Water	Swansea Bay	OFF LLIPUT LANE POINT 130 CSO SWAN	0	0	100
Dwr Cymru Welsh Water	River Tawe	CSO at QUARRY ROAD CLYDACH (POINT 125)	0	0	75.9
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

Annual figures up to and including 2025 come from official water company returns. The 2026 figure is our own estimate, derived continuously from the companies' live data feeds.

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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