Top of the Poops | Constituency | Merthyr Tydfil and Aberdare| Polluted by Dwr Cymru Welsh Water

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✔ means we have experimental daily data since 2023

Totals for Merthyr Tydfil and Aberdare in 2024

73 Sites polluted by Dwr Cymru Welsh Water

3,304 sewage dumps

18,740 hours duration

That's 2.17 years! On average 9.1 times a day

Change Over Time

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Constituencies near Merthyr Tydfil and Aberdare

Waterways in Merthyr Tydfil and Aberdare

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Pollution Summary 2024

Here are all the reported sewage overflow totals for Merthyr Tydfil and Aberdare in 2024. 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 9 of the total 77 CSO locations had reporting enabled for less than half the year. Of these 1 had zero reporting.

Company	Waterway	Site	Sewage Dumps	Duration (Hours)	Reporting %
Dwr Cymru Welsh Water	River Camnant	Hirwaun Wastewater Treatment Works	156	2,899	74
Dwr Cymru Welsh Water	River Cynon	MIKES FIELD CSO ABERAMAN	135	1,847	99.8
Dwr Cymru Welsh Water	River Cynon	CSO ABERAMAN IND EST ABERAMAN	94	1,076	80.3
Dwr Cymru Welsh Water	Taf Fechan	PONTSTICILL WWTW	98	1,055	99.8
Dwr Cymru Welsh Water	River Cynon	CSO Opposite Arthurs Place Trecynon	120	1,014	99.8
Dwr Cymru Welsh Water	Taff Bargoed	CSO at Bedlinog- Bowling Green	100	820	98.6
Dwr Cymru Welsh Water	River Cynon	Penderyn CSO - Tank In Field Raked Scre	97	679	97.8
Dwr Cymru Welsh Water	River Dare	A CSO AT FIELD ADJACENT TO DAVID ST	100	670	97.6
Dwr Cymru Welsh Water	Morlais Brook	A CSO AT WATERLOO HOUSE MERTHYR	121	659	96.5
Dwr Cymru Welsh Water	Taff	CSO PONT RHUN MERTHYR TYDFIL	94	609	96.3
Dwr Cymru Welsh Water	Pandy Brook	TRELEWIS CSO - REAR OF GLYNBARGOED	134	566	96.2
Dwr Cymru Welsh Water	River Cynon	CSO At Bottom Monk Street	88	477	99.8
Dwr Cymru Welsh Water	Nant-Y-Derlwyn	ABERDARE FORECOURT CSO LLWYDCOED	76	416	99.8
Dwr Cymru Welsh Water	Morlais Brook	CSO at The Bont, Merthyr Tydfil	90	412	96.3
Dwr Cymru Welsh Water	Taff Fechan	PONTSTICILL WWTW	24	385	99.9
Dwr Cymru Welsh Water	River Cynon	CSO at West Bank Of River South Of A455 Br	89	377	99.8
Dwr Cymru Welsh Water	Unnamed Leading To River Cynon	Llwydcoed CSO Side of Llwydcoed Motors	70	368	98.9
Dwr Cymru Welsh Water	Aberdare Canal	Pant-Y-Cerdin CSO, Aberdare	107	359	96.6
Dwr Cymru Welsh Water	River Taff	A CSO AT JACKSONS BRIDGE	93	347	99.8
Dwr Cymru Welsh Water	Nant Morlais	Rocky Rd CSO Merthyr Tydfil	78	341	92.9
Dwr Cymru Welsh Water	River Cynon	CSO AT BOTTOM MONK STREET (Station St Aberdare)	83	273	99.8
Dwr Cymru Welsh Water	Pentrebach Brook	Dixs Field CSO, Pentrebach, Merthyr	73	263	97.2
Dwr Cymru Welsh Water	River Taff	CSO COLLEGE CAR PK MERTHYR TYDFIL	53	236	99.8
Dwr Cymru Welsh Water	River Cynon	Cwmbach CSO - Outside Bro Deg	75	213	97.8
Dwr Cymru Welsh Water	River Aman	PLEASANT VIEW CSO	71	210	82.5
Dwr Cymru Welsh Water	Aman R - Source To Conf River Cynon	Aberaman Park Industrial Estate CSO, Aberdare	47	206	99.3
Dwr Cymru Welsh Water	River Taff	Merthyr Tydfil Georgetown Lines Bridge CSO	36	192	82.7
Dwr Cymru Welsh Water	River Taff	Gellideg Tai Mawr Rd CSO, Merthyr Tydfil	50	191	99.4
Dwr Cymru Welsh Water	Morlais Brook	CSO TREVITHICK MONUMENT MERTHYR	76	166	97.2
Dwr Cymru Welsh Water	River Taff	Quakers Yard CSO, Fiddlers Elbow St, Cynon	30	161	99.1
Dwr Cymru Welsh Water	River Taff	Quakers Yard CSO, Greenfield Victoria Bridge	34	156	46.6
Dwr Cymru Welsh Water	River Cynon	Cwmbach Bro Deg Near No44	56	122	98.4
Dwr Cymru Welsh Water	Goitre Brook	Goitre Lane CSO	21	72	99.5
Dwr Cymru Welsh Water	To Nant Gwrangon	CSO at Rhigos- Heol Pendarren	40	68	98.9
Dwr Cymru Welsh Water	Nant Gwawr	CSO at No20 Glancynon Terrace, Aberaman	88	67	41.8
Dwr Cymru Welsh Water	River Dare	CSO Off Glan Road (St John the Baptist Church)	20	62	63.9
Dwr Cymru Welsh Water	River Cynon	Aberaman Curre St CSO	35	56	99.5
Dwr Cymru Welsh Water	River Cynon River	Aberaman Wind St CSO Nr Mardy lodge	47	54	98.7
Dwr Cymru Welsh Water	River Cynon	HIRWAUN - REAR OF BUTE TERRACE	20	53	99.3
Dwr Cymru Welsh Water	River Taff	CSO Avenue De Clichy, Merthyr	26	53	99.8
Dwr Cymru Welsh Water	River Cynon	CSO at Hirwaun Trenant No 66 Rear of Garden	14	51	9.3
Dwr Cymru Welsh Water	River Cynon	CSO at Cwmbach Side of Police House	36	50	99.6
Dwr Cymru Welsh Water	River Cynon	Elizabeth St CSO	30	41	79.8
Dwr Cymru Welsh Water	River Cynon	Canal Rd CSO, Cwmbach	15	37	98.7
Dwr Cymru Welsh Water	River Cynon	ABERNANT RUGBY CLUB CSO	29	36	99.8
Dwr Cymru Welsh Water	River Cynon	CSO at Rear of No12 Bonhaul, Cwmbach	15	35	98.9
Dwr Cymru Welsh Water	River Cynon	CSO at Aberaman	16	34	99.7
Dwr Cymru Welsh Water	River Cynon	Cwmbach SPS	6	28	99.8
Dwr Cymru Welsh Water	Taf Fechan	High St CSO, Cefn Coed	32	25	99.1
Dwr Cymru Welsh Water	Nant Wenallt And Then To River Cynon	Forge Tip CSO Aberdare	23	23	79.7
Dwr Cymru Welsh Water	River Cynon	Cwmbach Sion Terrace No 11 CSO	17	17	99.1
Dwr Cymru Welsh Water	River Aman	CSO at Junction of David St & Pant Rd, Aberaman	4	16	85.8
Dwr Cymru Welsh Water	River Taff	TROEDYRHIW PS	4	11	99
Dwr Cymru Welsh Water	River Aman	Incline Row CSO, Aberaman	10	8	80.7
Dwr Cymru Welsh Water	River Taff	Phyllis Street CSO, Troedyrhiw	6	8	99.7
Dwr Cymru Welsh Water	Morlais Brook	Brewers Arms CSO, Balaclava Rd, Dowlais	16	8	84.1
Dwr Cymru Welsh Water	River Cynon	Penywaun - Rear Of 37/39 Erw L	13	7	98.1
Dwr Cymru Welsh Water	Gadlys Feeder	GLADLYS TUDOR TERRACE CSO	21	7	99.3
Dwr Cymru Welsh Water	River Cynon	Abercwmboi Parkview Capcoch Infant School CSO	11	6	98.9
Dwr Cymru Welsh Water	River Cynon	No. 29 Maeshyfryd CSO, Cwmbach	7	4	99.4
Dwr Cymru Welsh Water	River Cynon	CSO at Rear Of St Winifreds Church Hirwa	3	4	99.6
Dwr Cymru Welsh Water	River Cynon	CSO at Cwmbach Bryngolwg No 45	3	3	99.4
Dwr Cymru Welsh Water	Unnamed Leading To Aman River	Aberaman Cynon St rear of	6	2	99.6
Dwr Cymru Welsh Water	Un Leading To Nant Morlais	Dowlais Market St & High St Junction	2	2	97.1
Dwr Cymru Welsh Water	River Taff	CSO WILLOW GAS WORKS MERTHYR TYDFIL	2	1	94.3
Dwr Cymru Welsh Water	River Aman	CSO at Aberaman Cardiff Road No 104	5	1	8.9
Dwr Cymru Welsh Water	River Cynon	No 1 Wellington St CSO, Robertstown	1	1	42.1
Dwr Cymru Welsh Water	River Taff	3rd Trunk CSO South of Glan Yr Afon	3	1	20.9
Dwr Cymru Welsh Water	River Taff	Troedyrhiw, Yew Street CSO	2	0	31.5
Dwr Cymru Welsh Water	Nant-Y-Derlwyn	Trecynon, Harriet St CSO	3	0	98.7
Dwr Cymru Welsh Water	Unnamed Stream And Thence To River Cynon	CSO at HIRWAUN - ON TRAMWAY	2	0	82.1
Dwr Cymru Welsh Water	Morlais Brook	CSO AT DOWLAIS BALACLAVA ROAD	1	0	99.2
Dwr Cymru Welsh Water	Aman R - Source To Conf River Cynon	Fforchaman Street CSO	1	0	36.3
Dwr Cymru Welsh Water	Bargoed Taf	CSO at QUAKERS YARD - NEAR PUBLIC HOU	0	0	94
Dwr Cymru Welsh Water	River Taff	TRUNK CSO 2A OFF ABERFAN ROAD	0	0	99.7
Dwr Cymru Welsh Water	River Cynon	CSO at Hirwaun Trenant No70 Rear of Garden	0	0	0
Dwr Cymru Welsh Water	Morlais Brook	Balaclava Rd CSO, Dowlais	0	0	99.7

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. This 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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Merthyr Tydfil and Aberdare Polluted by sewage 3,304 times in 2024 lasting 18,740 hours - That's 2.17 years! Monitoring was disabled in some locations, so could be more

Merthyr Tydfil and Aberdare