Aberdâr

Polluted by sewage 1,661 times in 2025 lasting 7,679 hours

Monitoring was disabled in some locations, so could be more

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Totals for Aberdâr in 2025

41 Sites polluted by Dwr Cymru Welsh Water

1,661 sewage dumps

7,679 hours duration

Sewage pollution map of Aberdâr: 7,679 hours in 2025

That's 10.67 months. On average 4.6 times a day

Change Over Time

Constituency for Aberdâr

Nearby Constituencies

Waterways in Aberdâr

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Pollution Summary 2025

Here are all the reported sewage overflow totals for Aberdâr 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 3 of the total 45 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 3 had zero reporting.

Company	Waterway	Site	Sewage Dumps	Duration (Hours)	Reporting %
Dwr Cymru Welsh Water	River Cynon	MIKES FIELD CSO ABERAMAN	121	1,591	99.9
Dwr Cymru Welsh Water	River Cynon	CSO ABERAMAN IND EST ABERAMAN	112	1,282	99.9
Dwr Cymru Welsh Water	River Cynon	CSO Opposite Arthurs Place Trecynon	96	554	99.8
Dwr Cymru Welsh Water	River Dare	A CSO AT FIELD ADJACENT TO DAVID ST	98	525	98.5
Dwr Cymru Welsh Water	River Cynon	CSO at West Bank Of River South Of A455 Br	88	449	99.9
Dwr Cymru Welsh Water	River Cynon	CSO At Bottom Monk Street	93	444	99.8
Dwr Cymru Welsh Water	Nant-Y-Derlwyn	ABERDARE FORECOURT CSO LLWYDCOED	77	426	99.9
Dwr Cymru Welsh Water	Aberdare Canal	Pant-Y-Cerdin CSO, Aberdare	100	424	97.3
Dwr Cymru Welsh Water	River Cynon	CSO AT BOTTOM MONK STREET (Station St Aberdare)	84	307	98.7
Dwr Cymru Welsh Water	River Aman	PLEASANT VIEW CSO	90	273	92.5
Dwr Cymru Welsh Water	River Cynon	Cwmbach CSO - Outside Bro Deg	70	214	98.4
Dwr Cymru Welsh Water	River Cynon	Penywaun - Rear Of 37/39 Erw L	52	176	98.8
Dwr Cymru Welsh Water	River Cynon	CSO at Hirwaun Trenant No 66 Rear of Garden	66	152	91
Dwr Cymru Welsh Water	River Cynon	Cwmbach Bro Deg Near No44	52	150	99.1
Dwr Cymru Welsh Water	River Dare	CSO Off Glan Road (St John the Baptist Church)	42	117	99.6
Dwr Cymru Welsh Water	River Cynon	HIRWAUN - REAR OF BUTE TERRACE	40	88	97
Dwr Cymru Welsh Water	River Cynon	ABERNANT RUGBY CLUB CSO	50	85	99.8
Dwr Cymru Welsh Water	Aman R - Source To Conf River Cynon	Aberaman Park Industrial Estate CSO, Aberdare	29	61	99.7
Dwr Cymru Welsh Water	River Cynon	Cwmbach Sion Terrace No 11 CSO	19	51	99.2
Dwr Cymru Welsh Water	River Cynon River	Aberaman Wind St CSO Nr Mardy lodge	48	44	99.8
Dwr Cymru Welsh Water	River Cynon	CSO at Cwmbach Side of Police House	24	42	99.5
Dwr Cymru Welsh Water	River Cynon	Aberaman Curre St CSO	32	38	99.8
Dwr Cymru Welsh Water	River Cynon	Elizabeth St CSO	27	33	99.3
Dwr Cymru Welsh Water	River Aman	CSO at Aberaman Cardiff Road No 104	23	25	99.6
Dwr Cymru Welsh Water	River Cynon	Canal Rd CSO, Cwmbach	16	23	98.6
Dwr Cymru Welsh Water	River Cynon	CSO at Rear of No12 Bonhaul, Cwmbach	12	22	99.2
Dwr Cymru Welsh Water	Nant Wenallt And Then To River Cynon	Forge Tip CSO Aberdare	27	21	99.6
Dwr Cymru Welsh Water	Nant Gwawr	CSO at No20 Glancynon Terrace, Aberaman	25	10	88.5
Dwr Cymru Welsh Water	River Cynon	Cwmbach SPS	3	10	99.9
Dwr Cymru Welsh Water	River Cynon	Cwmpennar CSO, Adj Low Rd, Mountain Ash	5	8	94.2
Dwr Cymru Welsh Water	River Aman	Incline Row CSO, Aberaman	6	5	99.7
Dwr Cymru Welsh Water	River Aman	CSO at Junction of David St & Pant Rd, Aberaman	2	4	88
Dwr Cymru Welsh Water	River Cynon	Abercwmboi Parkview Capcoch Infant School CSO	7	3	100
Dwr Cymru Welsh Water	Gadlys Feeder	GLADLYS TUDOR TERRACE CSO	6	3	91.1
Dwr Cymru Welsh Water	River Cynon	No 1 Wellington St CSO, Robertstown	7	2	100
Dwr Cymru Welsh Water	River Cynon	CSO at Aberaman	3	1	99.3
Dwr Cymru Welsh Water	Aman R - Source To Conf River Cynon	Fforchaman Street CSO	2	1	99.9
Dwr Cymru Welsh Water	River Cynon	CSO at Cwmbach Bryngolwg No 45	2	0	99.9
Dwr Cymru Welsh Water	Unnamed Leading To Aman River	Aberaman Cynon St rear of	2	0	99.8
Dwr Cymru Welsh Water	River Cynon	No. 29 Maeshyfryd CSO, Cwmbach	2	0	100
Dwr Cymru Welsh Water	Unnamed Stream And Thence To River Cynon	CSO at HIRWAUN - ON TRAMWAY	1	0	95.4
Dwr Cymru Welsh Water	River Cynon	CSO at Hirwaun Trenant No70 Rear of Garden	0	0	0
Dwr Cymru Welsh Water	River Cynon	CSO at Rear Of St Winifreds Church Hirwa	0	0	0
Dwr Cymru Welsh Water	Unnamed Leading To River Cynon	Llwydcoed CSO Side of Llwydcoed Motors	0	0	0
Dwr Cymru Welsh Water	Nant-Y-Derlwyn	Trecynon, Harriet St CSO	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

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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