Top of the Poops | Constituency Sewage Map | Aberafan Maesteg

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Live data for Aberafan Maesteg in 2026

So far this year (as of 18 May 2026, 12:00) there has been 7,318 hours of sewage overflows, from 59 CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway s

Totals for Aberafan Maesteg in 2025

50 Sites polluted by Dwr Cymru Welsh Water

2,625 sewage dumps

16,407 hours duration

That's 1.9 years. On average 7.2 times a day

Change Over Time

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Constituencies near Aberafan Maesteg

Waterways in Aberafan Maesteg

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Pollution Summary 2025

Here are all the reported sewage overflow totals for Aberafan Maesteg 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 Llynfi	LLETTY BRONGU STW LLANGYNWYD MAESTG	130	2,015	99.9
Dwr Cymru Welsh Water	River Kenfig	Marlas STW SPS	70	1,080	99.5
Dwr Cymru Welsh Water	River Afan	Abercregan PS	64	1,065	99.9
Dwr Cymru Welsh Water	Swansea Bay	AFAN WWTW	74	968	99.9
Dwr Cymru Welsh Water	River Llynfi	Maesteg South CSO Asset 95015	107	794	99.9
Dwr Cymru Welsh Water	River Llynfi	27 Talbot Street CSO, Maesteg	132	700	98.2
Dwr Cymru Welsh Water	River Llynfi	SPELTER CSO ASSET 52423	78	699	94.1
Dwr Cymru Welsh Water	River Afan	CSO No. 109 at Cymmer SPS	123	657	99.7
Dwr Cymru Welsh Water	River Llyfni	CAERAU STH CSO ASSET 52420 MAESTEG	49	648	99.9
Dwr Cymru Welsh Water	Llynfi River	CSO Greenfield Street	135	635	99.9
Dwr Cymru Welsh Water	River Alyn	Cwmafan RFC CSO	65	605	98.3
Dwr Cymru Welsh Water	River Llynfi	CAERAU ROAD CSO ASSET 52427 MAESTEG	50	583	99.8
Dwr Cymru Welsh Water	River Afan	CSO 101 THE WAUN 200M U/S FOOTBRIDGE	91	564	99.2
Dwr Cymru Welsh Water	Nant Y Twlc	CSO HEOL FAEN GARTH (POINT 22)	113	537	98.2
Dwr Cymru Welsh Water	Nant Cwm-Clais	CSO at rear of Ynys Y Wern	85	480	98.3
Dwr Cymru Welsh Water	River Llynfi	CSO STH OF GREENFIELD TERRACE PONT	90	473	99.9
Dwr Cymru Welsh Water	River Pelenna	CSO No 110 Tonmawr	92	462	99.4
Dwr Cymru Welsh Water	River Tawe	CSO 104 NEWBRIDGE ROAD PUMPING STAT	43	414	99.8
Dwr Cymru Welsh Water	Ffrwd Wyllt	CSO No 134 Goytre Bryn Afan	100	352	98.7
Dwr Cymru Welsh Water	River Llynfi	Hermon Road CSO Asset 52425 Maesteg	81	330	99.9
Dwr Cymru Welsh Water	River Afan	CSO at O/S 54 YNYS STREET	54	304	99.5
Dwr Cymru Welsh Water	River Corrwg	CSO 129 Glyncorrwg CSO Glyncorrwg	73	286	99.9
Dwr Cymru Welsh Water	Croeserw Brook	CSO 122 18 DUKE STREET AFAN	34	212	99.6
Dwr Cymru Welsh Water	Ffrwd Wyllt	GLANDYRRRYN CLOSE CSO PORT TALBOT	35	191	99.9
Dwr Cymru Welsh Water	River Llynfi	CSO Caerau Square (Point 10)	87	187	82.3
Dwr Cymru Welsh Water	River Llynfi	SLAUGHTER HOUSE CSO ASSET 52415	41	154	99.9
Dwr Cymru Welsh Water	River Afan	CSO No 115 Scotts Yard Cwmafan	53	145	96.5
Dwr Cymru Welsh Water	Swansea Bay	AFAN WWTW PHOENIX WHARF HARBOUR RD	21	138	75.9
Dwr Cymru Welsh Water	River Afan	Britannia Inn CSO, Cwmafan	47	126	99
Dwr Cymru Welsh Water	River Pelenna	CSO 103 Under R'Dbr Pontrhydyfen	59	103	98.9
Dwr Cymru Welsh Water	River Afan	Duffryn CSO	30	95	99.9
Dwr Cymru Welsh Water	River Afan	CSO NO 126 MOORS ST CULVERT AFAN	38	83	99.8
Dwr Cymru Welsh Water	River Afan	CSO 107 Below Alder Terrace Afan	42	78	97.5
Dwr Cymru Welsh Water	Swansea Bay	ABBEY SPS BRITISH STEEL SITE	10	39	99.4
Dwr Cymru Welsh Water	Nant Y Twlc	CSO at Bridgend Road Garth (Point 23)	39	39	97.4
Dwr Cymru Welsh Water	River Llynfi	Church Street CSO, Maesteg	23	25	80.6
Dwr Cymru Welsh Water	Neath Estuary	GIANTS GRAVE SPS PILL TERRACE	11	20	99.9
Dwr Cymru Welsh Water	River Llynfi Via Surface Water Sewer	Castle Street CSO	16	20	96.1
Dwr Cymru Welsh Water	River Afan	Afan St CSO	27	16	98
Dwr Cymru Welsh Water	River Afan	CSO 108 REAR 16 MARGAM ST CYMMER	27	14	99.9
Dwr Cymru Welsh Water	River Cynffig Via Surface Water Sewer	Hazel Grove SPS	5	14	99.7
Dwr Cymru Welsh Water	River Afan	Blaengwnfi Stormwater Overflow Cham	16	12	99
Dwr Cymru Welsh Water	River Afan	Pontrhydyfen Road Bridge CSO	19	7	97.5
Dwr Cymru Welsh Water	River Llynfi	CSO Cwmfelin (Point 26)	14	5	77.7
Dwr Cymru Welsh Water	River Pelenna	CSO 117 Playground 3 Morgan Trce	5	5	98.6
Dwr Cymru Welsh Water	River Llynfi	CSO at Maesteg Market (Point 18)	17	4	100
Dwr Cymru Welsh Water	River Llynfi Via Culvert	Heol Y Llwyni CSO	6	2	99.7
Dwr Cymru Welsh Water	Neath Estuary	BRITON FERRY SPS INNER DOCK NEATH	2	1	99.9
Dwr Cymru Welsh Water	Kenfig/Sea Via Sker Surface Water Sewer	HEOL FACH CSO NORTH CORNELLY	1	0	77.2
Dwr Cymru Welsh Water	River Fach	Lon-Y-Caridan CSO	1	0	96.7
Dwr Cymru Welsh Water	Arnallt Brook	CSO 123 MARGAM PS NR BROMBILL ST	0	0	99.9
Dwr Cymru Welsh Water	Neath Estuary	GEORGES ROW SPS GEORGES ROW NEATH	0	0	99.9
Dwr Cymru Welsh Water	Sea Via Sker Outfall	GREEN ACRES PS SOUTH CLOVELLY	0	0	99.9
Dwr Cymru Welsh Water	River Llynfi	HEARTS OF OAK COTTAGES (STORM) MA	0	0	83.7
Dwr Cymru Welsh Water	Sea Via Sker Surface Water Sewer	South Cornelly Green Avres PS	0	0	99.9

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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© 2020-2025 Top-Of-The-Poops CC-BY-SA 4.0,
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Contains Water UK National Storm Overflow Hub Data CC-BY-SA 4.0 and analysis © 2025 Top-Of-The-Poops

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