Top of the Poops | Constituency Sewage Map | Blaenau Gwent and Rhymney

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Live data for Blaenau Gwent and Rhymney in 2026

So far this year (as of 18 May 2026, 12:00) there has been 5,391 hours of sewage overflows, from 98 CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway s

Totals for Blaenau Gwent and Rhymney in 2025

78 Sites polluted by Dwr Cymru Welsh Water

2,795 sewage dumps

12,151 hours duration

That's 1.41 years. On average 7.7 times a day

Change Over Time

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Constituencies near Blaenau Gwent and Rhymney

Waterways in Blaenau Gwent and Rhymney

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Pollution Summary 2025

Here are all the reported sewage overflow totals for Blaenau Gwent and Rhymney 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 4 of the total 93 CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway locations had reporting enabled for less than half the year. Of these 4 had zero reporting.

Company	Waterway	Site	Sewage Dumps	Duration (Hours)	Reporting %
Dwr Cymru Welsh Water	River Clydach	BRYNMAWR STW BLACKROCK BRYNMAWR	122	1,583	99.9
Dwr Cymru Welsh Water	River Rhymney	Abertysswg Rugby Playing Field CSO	92	793	99
Dwr Cymru Welsh Water	Nant Bargoed	Deri, Darran Valley CSO	68	764	99.9
Dwr Cymru Welsh Water	River Ebbw	RIVERSIDE DOCTORS SURGERY EBBW VALE CSO	102	758	99.9
Dwr Cymru Welsh Water	River Sirhowy	Tredegar Park Place CSO	161	709	94.9
Dwr Cymru Welsh Water	River Bargoed	Bedwellty Road CSO	155	667	97.7
Dwr Cymru Welsh Water	River Rhymney	A CSO AT PONTLOTTYN	89	572	99.9
Dwr Cymru Welsh Water	River Rhymney	CSO At New Tredegar Adj Rhosyn Gwyn	38	440	99.9
Dwr Cymru Welsh Water	River Ebbw	The Square Street, Abertillery CSO	52	344	96
Dwr Cymru Welsh Water	River Sirhowy	CSO 32075 Opposite Garibaldi Bridge	75	302	99.1
Dwr Cymru Welsh Water	River Ebbw Fawr	CWM SSO	49	299	99.6
Dwr Cymru Welsh Water	Ebbw Fach River	Abertillery Six Bells Colliery No. 2 CSO	34	252	97
Dwr Cymru Welsh Water	River Sirhowy	A CSO AT REAR OF CHURCH SQ TREDEGAR	79	250	99.8
Dwr Cymru Welsh Water	River Rhymney	CSO NEAR RHYMNEY STATION	58	244	99.2
Dwr Cymru Welsh Water	River Sirhowy	CSO at Tredegar, South of Pochin Crescent	39	233	91.1
Dwr Cymru Welsh Water	River Sirhowy	CSO OPP 1 DUKESTOWN ROAD TREDEGAR	60	228	99.9
Dwr Cymru Welsh Water	River Ebbw Fach	Berea Close CSO, Blaina	46	211	97.5
Dwr Cymru Welsh Water	Ebbw Fawr	CSO at Ebbw Vale Victoria Reclamation Scheme	26	201	99.6
Dwr Cymru Welsh Water	River Sirhowy	CSO Opposite White Lion Cottages	55	199	99.3
Dwr Cymru Welsh Water	Nant Yr Ystruth	CSO at LIBRARY ON HIGH STREET BLAINA	60	190	97.9
Dwr Cymru Welsh Water	River Sirhowy	CSO at Tredegar, Edward Terrace Nr River Bridge	69	190	99
Dwr Cymru Welsh Water	River Rhymney	CSO AT REAR OF MEMORIAL HOSPITAL	58	188	99
Dwr Cymru Welsh Water	Sirhowy River	CSO at Tredegar, Vicarage Road Rear of Hill Rest	56	178	99.3
Dwr Cymru Welsh Water	Nant Bargoed Rhymney	CSO AT ABERBARGOED VIADUCT	18	168	99.9
Dwr Cymru Welsh Water	River Rhymney	Rhymney Carno St Bute House CSO	48	144	99.2
Dwr Cymru Welsh Water	Rhymney R - Source To Conf Nant Bargod Rhymni	Pontlottyn Newydd Farm CSO	43	128	99.7
Dwr Cymru Welsh Water	Ebbw River	CSO 29 OPP THE CROFT STEELWORKS RD	45	122	66.6
Dwr Cymru Welsh Water	Rhymney R - Source To Conf Nant Bargod Rhymni	Pontlottyn Recreation Ground CSO	46	110	99.3
Dwr Cymru Welsh Water	Ebbw Fawr	GOSPEL HALL CSO BEAUFOR RD EBBW VA	49	106	99.9
Dwr Cymru Welsh Water	River Rhymney	CSO BARGOED	55	101	99.9
Dwr Cymru Welsh Water	River Rhymney	CSO Nr Bethania Cottages	54	99	69.5
Dwr Cymru Welsh Water	Sirhowy River	CSO 32084 Scwrfa Road, Tredegar	43	96	99.9
Dwr Cymru Welsh Water	River Clydach	Opp Bridge End Inn CSO	44	94	99
Dwr Cymru Welsh Water	River Tillery	Glan Ebbw terrace CSO, Abertillery	37	88	99.1
Dwr Cymru Welsh Water	River Ebbw	Ebbw Vale PontyGof	38	84	93.6
Dwr Cymru Welsh Water	Ebbw Fach R - Source To Conf Ebbw R	CSO AT ABERTILLERY FOUNDARY BRIDGE NR CAR PARK	34	80	99.3
Dwr Cymru Welsh Water	Ebbw Fawr	CSO 31 ADJ STEELWORKS RD CAR PARK	21	79	99.9
Dwr Cymru Welsh Water	Ebbw Fach	Abertillery Six Bells Colliery No.1 CSO	10	72	99.6
Dwr Cymru Welsh Water	Ebbw River	Allotment Rd CSO	13	72	99.9
Dwr Cymru Welsh Water	River Sirhowy	CSO at Tredegar, Railway View, opposite No13	52	64	99.5
Dwr Cymru Welsh Water	Ebbw River	Tredegar Rd Nr 62A, Ebbw Vale	29	64	99.7
Dwr Cymru Welsh Water	River Rhymney	CSO Opposite Bowen Ind Estate, Aberbargoed	36	60	99.7
Dwr Cymru Welsh Water	Ebbw Fach	South Griffin Colliery CSO	17	52	99.5
Dwr Cymru Welsh Water	River Sirhowy	WVTS-Tredegar (MH G57) CSO	21	46	100
Dwr Cymru Welsh Water	River Rhymney	CSO at rear of Margaret St., Gilfach	24	44	96.9
Dwr Cymru Welsh Water	Sirhowy River	Tredegar Vale Terrace R/O 61	40	42	99.7
Dwr Cymru Welsh Water	Sirhowy River	Morgan St CSO, Tredegar	38	42	99.6
Dwr Cymru Welsh Water	Nant Melyn/Rasa Brook	Coedcae House CSO	18	32	99.2
Dwr Cymru Welsh Water	River Sirhowy	CSO at Tredegar, Vale Terrace R/O 101 U/S Garage	31	29	92.1
Dwr Cymru Welsh Water	River Sirhowy	CSO at Tredegar, Brompton SSO 1 MH No GN86A	10	27	99.7
Dwr Cymru Welsh Water	Ebbw Fach	Abertillery Park View Terrace CSO	14	27	99.9
Dwr Cymru Welsh Water	Ebbw Fawr	CSO Adj to The Institute	13	25	99.9
Dwr Cymru Welsh Water	Ebbw River	CWM (EBBW VALE) CSO	25	22	99.4
Dwr Cymru Welsh Water	River Ebbw Fach	West Side Sewer CSO	15	15	99.4
Dwr Cymru Welsh Water	Ebbw Fach	CSO at Abertillery Six Bells	22	14	99.3
Dwr Cymru Welsh Water	Ebbw Fawr	CSO at Opp No 11 Brynhyfryd Terr Ebbw Vale	20	14	99.9
Dwr Cymru Welsh Water	Sirhowy River	Tredegar Ladies Row CSO o/s School Entrance	10	9	99.6
Dwr Cymru Welsh Water	Ebbw River	Excelsior Street (rear lane)	8	8	93.2
Dwr Cymru Welsh Water	River Ebbw	Cwn Marine St CSO	7	7	99.8
Dwr Cymru Welsh Water	River Ebbw Fach	WVTS-Nantyglo Station SSO	8	7	99.9
Dwr Cymru Welsh Water	River Ebbw Fach	CSO at Limestone Road	5	7	100
Dwr Cymru Welsh Water	Culverted River Fac	CSO at Nantyglo Market Rd under crash barrier	8	6	99.8
Dwr Cymru Welsh Water	River Rhymney	A CSO AT BIRTHDIR NEAR STATION	3	5	99.9
Dwr Cymru Welsh Water	Ebbw River	Brooklyn Terrace CSO	16	4	99.7
Dwr Cymru Welsh Water	Ebbw River	CSO AT LLANHILLETH DISUSED COLLIERY	15	4	99.7
Dwr Cymru Welsh Water	Rhymney	Bargoed Colliery CSO	10	4	99.9
Dwr Cymru Welsh Water	Ebbw Fawr	Beaufort Terrace CSO	7	3	96.1
Dwr Cymru Welsh Water	River Bargoed	63 Bedwellty Rd CSO	10	2	100
Dwr Cymru Welsh Water	Ebbw Fawr	CSO at Ebbw Vale Junction of Tredegar Rd & Harcourt St	5	1	99.8
Dwr Cymru Welsh Water	Ebbw River	Commercial Rd	4	1	99.9
Dwr Cymru Welsh Water	Rasa Brook	Under Flyover	3	0	99.1
Dwr Cymru Welsh Water	Ebbw Fach River	Abertillery Victoria Road Six Bells CSO	2	0	93.6
Dwr Cymru Welsh Water	River Sirhowy	CSO at Tredegar, Vale Terrace R/O 123	2	0	100
Dwr Cymru Welsh Water	Ebbw Fach	OLD SOUTH GRIFFIN COLLIERY CSO	2	0	99.9
Dwr Cymru Welsh Water	River Ebbw Fach	Abertillery Six Bells Rd	1	0	100
Dwr Cymru Welsh Water	River Tillery	CSO at R/O ST MICHAELS CHURCH ABERTILLERY	1	0	99.9
Dwr Cymru Welsh Water	River Tillery	Commercial St CSO, Abertillery	1	0	100
Dwr Cymru Welsh Water	Rhymney River	New Tredegar Birch Grove	1	0	99.3
Dwr Cymru Welsh Water	River Rhymney	Aberbargoed CSO	0	0	96.3
Dwr Cymru Welsh Water	Sirhowy River	CSO AT REAR OF NO1 ALEXANDRA PLACE	0	0	0
Dwr Cymru Welsh Water	River Ebbw	CSO NO.32031 EBBW VALE RUGBY GROUND	0	0	98.4
Dwr Cymru Welsh Water	Ebbw Fawr	CSO O/S Beaufort Arms, Beaufort Rd, Ebbw Vale	0	0	0
Dwr Cymru Welsh Water	Ebbw Fawr	CSO at Ebbw Vale Beaufort Rd & Badminton Grove Junction	0	0	0
Dwr Cymru Welsh Water	Ebbw Fawr Via A Surface Water Culvert	CSO at Ebbw Vale Queens Square	0	0	100
Dwr Cymru Welsh Water	River Ebbw	CSO at R/O PH Beaufort Rd / R/O 23 Lillian Grove	0	0	100
Dwr Cymru Welsh Water	Ebbw River	CSO at Rear of 4 Harcourt Street, Ebbw Vale	0	0	99.7
Dwr Cymru Welsh Water	River Sirhowy	CSO at St James Close Maes-Y-Coed,Tredegar	0	0	100
Dwr Cymru Welsh Water	Ebbw Fach	Castle St CSO, Abertillery	0	0	99.7
Dwr Cymru Welsh Water	Ebbw River	Lambs Square CSO	0	0	100
Dwr Cymru Welsh Water	River Ebbw	Lambs Square/Lower Square	0	0	97.6
Dwr Cymru Welsh Water	Ebbw Fach	Nantyglo Farm Rd/Market Rd Junction CSO	0	0	100
Dwr Cymru Welsh Water	River Tillery	Tillery St No9 CSO, Abertillery	0	0	100
Dwr Cymru Welsh Water	Unnamed Drain To Ebbw Fach	WVTS-Cwmtillery CSO	0	0	0

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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