Top of the Poops | Senedd Constituency Sewage Map | Afan Ogwr Rhondda

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Totals for Afan Ogwr Rhondda in 2025

144 Sites polluted by Dwr Cymru Welsh Water

7,377 sewage dumps

45,980 hours duration

That's 5.32 years. On average 20.2 times a day

Change Over Time

Senedd Constituencies near Afan Ogwr Rhondda

Westminster Constituencies within Afan Ogwr Rhondda

To see live data by overflow, go to the Westminster Constituency, then 'live data'

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Pollution Summary 2025

Here are all the reported sewage overflow totals for Afan Ogwr Rhondda 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 1 of the total 156 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.

Company	Waterway	Site	Sewage Dumps	Duration (Hours)	Reporting %
Dwr Cymru Welsh Water	Rhondda River Fawr	REGENT ST CSO TREORCHY RHONDDA	154	2,155	99.9
Dwr Cymru Welsh Water	River Llynfi	LLETTY BRONGU STW LLANGYNWYD MAESTG	130	2,015	99.9
Dwr Cymru Welsh Water	Ogwr Fach	DIMBATH AVE BLACKMILL BRIDGEND CSO	119	1,861	99.9
Dwr Cymru Welsh Water	River Garw	BETTWS ROAD CSO LLANGEINOR	124	1,850	96.8
Dwr Cymru Welsh Water	Ogwr Fach	Blackmill CSO & Storage Tanks Br'Nd	87	1,821	99.9
Dwr Cymru Welsh Water	Ogwr Fawr	CSO BELOW CEMETERY RD OGMORE VALE	139	1,820	73.7
Dwr Cymru Welsh Water	River Ely	ELY VALLEY ROAD CSO,	113	1,118	99.8
Dwr Cymru Welsh Water	River Rhondda	Brook Street Combined Sewer Overflow	149	1,099	99.9
Dwr Cymru Welsh Water	River Kenfig	Marlas STW SPS	70	1,080	99.5
Dwr Cymru Welsh Water	River Garw	STATION ROW CSO PONTYRHYL BRIDGEND	97	1,078	98.5
Dwr Cymru Welsh Water	River Afan	Abercregan PS	64	1,065	99.9
Dwr Cymru Welsh Water	River Garw	Fenton Place CSO Pont Y Cymer	121	994	99.9
Dwr Cymru Welsh Water	Swansea Bay	AFAN WWTW	74	968	99.9
Dwr Cymru Welsh Water	Rhondda Fawr	Station Rd CSO, Dinas, Porth	120	919	95.8
Dwr Cymru Welsh Water	River Rhondda Fach	Ferndale Road CSO Tylorstown RCT	86	903	99.4
Dwr Cymru Welsh Water	Ogwr Fawr	Nant Y Moel Junior School CSO	123	874	99.9
Dwr Cymru Welsh Water	River Rhondda Fach	R/O Tylorstown Primary School CSO, Tylorstown	115	868	98.1
Dwr Cymru Welsh Water	River Llynfi	Maesteg South CSO Asset 95015	107	794	99.9
Dwr Cymru Welsh Water	River Rhondda Fach	Rear of Fir St CSO, Ferndale	114	794	98.9
Dwr Cymru Welsh Water	Rhondda Fawr	Ton Pentre PS CSOTont Pentre RCT	128	779	99.6
Dwr Cymru Welsh Water	Ogwr Fawr	CSO BLANDY TERRACE ADJ ST JOHN ST	103	722	99.9
Dwr Cymru Welsh Water	Nant Clydach	A CSO at Clydach Vale Davies Street	122	709	98.9
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	Ogwr Fach	CSO At Farmland Nr Elm Street	74	603	99.4
Dwr Cymru Welsh Water	Nant-Y-Ci, The Ogwr Fawr	TY YR AFON CSO TY YR AFON PANTARWEL	61	596	99.9
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	River Rhondda Fawr	Rear of Richards Terrace CSO	50	562	89.9
Dwr Cymru Welsh Water	River Rhondda Fach	Ferndale Banana Tip CSO Additional	82	555	89.3
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	Rhondda Fawr River	CSO GYLFACH ROAD PORTH RHONDDA	94	420	99.9
Dwr Cymru Welsh Water	River Tawe	CSO 104 NEWBRIDGE ROAD PUMPING STAT	43	414	99.8
Dwr Cymru Welsh Water	River Rhondda Fach	CSO OPP 37 EDMONDES ST TYLORSTOWN	63	376	99.4
Dwr Cymru Welsh Water	Ffrwd Wyllt	CSO No 134 Goytre Bryn Afan	100	352	98.7
Dwr Cymru Welsh Water	River Rhondda Fach	CSO at CROSS STREET YNYSHIR R-C-T	99	348	99.9
Dwr Cymru Welsh Water	River Rhondda Fach	Rear of Blake St CSO, Maerdy	77	337	96.9
Dwr Cymru Welsh Water	River Llynfi	Hermon Road CSO Asset 52425 Maesteg	81	330	99.9
Dwr Cymru Welsh Water	Rhondda Fawr River	GLANNANT ST/DINAS ROAD CSO	85	318	99.2
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	River Rhondda Fawr	CSO at Junct Ystrad/Church Road Ystrad	125	281	93.1
Dwr Cymru Welsh Water	River Rhondda Fach	Station Rd CSO, Ferndale	97	278	99
Dwr Cymru Welsh Water	Rhondda Fawr River	Blaencwm Rd/Tydraw Terrace CSO	74	268	99.1
Dwr Cymru Welsh Water	Rhondda River	CSO at Rear of George Street, Treherbert	73	267	97.7
Dwr Cymru Welsh Water	River Rhondda Fach	FERNDALE BANANA TIP CSO	75	260	98.7
Dwr Cymru Welsh Water	River Rhondda Fach	Aberrhondda Road CSO	62	247	98.3
Dwr Cymru Welsh Water	Ogwr Fawr	SWO East Bank Behind Gilead C Nant	88	217	93.6
Dwr Cymru Welsh Water	Rhondda Fawr	CSO O/S Welcome Inn, Tylacelyn Rd, Penygraig	82	215	99
Dwr Cymru Welsh Water	Croeserw Brook	CSO 122 18 DUKE STREET AFAN	34	212	99.6
Dwr Cymru Welsh Water	River Rhondda Fach	Ferndale Banana Tip No.1 CSO	22	212	23.1
Dwr Cymru Welsh Water	River Rhondda Fach	Highfield Industrial Estate CSO, Ferndale	63	209	97.8
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	Rhondda Fawr	Gelligaled Pk CSO Ystrad Rhondda	62	184	99.1
Dwr Cymru Welsh Water	Rhondda Fach	CSO at Blaenllechau School St	58	173	71
Dwr Cymru Welsh Water	Nant Clydach	Railway Terrace CSO, Clydach Vale	60	166	97.1
Dwr Cymru Welsh Water	River Llynfi	SLAUGHTER HOUSE CSO ASSET 52415	41	154	99.9
Dwr Cymru Welsh Water	River Rhondda	A Combined Sewer Overflow, Trehafod	13	152	94.5
Dwr Cymru Welsh Water	Rhondda Fach	FERNDALE BANANA TIP SSO OLD SCHOOL	37	152	99.9
Dwr Cymru Welsh Water	River Afan	CSO No 115 Scotts Yard Cwmafan	53	145	96.5
Dwr Cymru Welsh Water	River Ely	CSO at Mill Street, Tonyrefail	51	141	99.4
Dwr Cymru Welsh Water	Swansea Bay	AFAN WWTW PHOENIX WHARF HARBOUR RD	21	138	75.9
Dwr Cymru Welsh Water	Rhondda R - Source To Conf River Rhondda Fach	Penygraig Rd CSO, Penygraig	75	137	99
Dwr Cymru Welsh Water	River Ogwr Fawr	CSO Car Park New Ogmore Vale School	18	137	98.1
Dwr Cymru Welsh Water	River Rhondda Fach	Maerdy Station Road CSO	44	127	99.5
Dwr Cymru Welsh Water	River Afan	Britannia Inn CSO, Cwmafan	47	126	99
Dwr Cymru Welsh Water	Rhondda Fach River	PONTYGWAITH BRIDGE CSO ASSET 71188	55	123	97.7
Dwr Cymru Welsh Water	Ogwr Fach Via A Surface Water Sewer	Rear of Dan-Y-Bryn CSO, Gilfach Goch	61	117	93.4
Dwr Cymru Welsh Water	Ogwr Fawr	CSO at E E.Bank Opp SWO Northern	19	112	96.8
Dwr Cymru Welsh Water	River Ely	CSO at Tonyrefail, Waunrhydd Road	39	112	98.8
Dwr Cymru Welsh Water	River Rhondda	Llwynypia Rd CSO, Tonypandy	73	105	99.1
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	Rhondda Fach	CSO at Blaenllechau Commercial & George St Jn	26	86	99.5
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	Rhondda River Fawr	Llwynypia SPS	45	57	99.9
Dwr Cymru Welsh Water	Rhondda Fawr	REES STREET PUMPING STATION GELLI	39	44	99.9
Dwr Cymru Welsh Water	River Rhondda	CSO AT CADWGAN TERRACE TREHAFOD	16	41	99.9
Dwr Cymru Welsh Water	Rhondda Fawr	CSO to rear of 8 Griffin Park	13	40	62
Dwr Cymru Welsh Water	Swansea Bay	ABBEY SPS BRITISH STEEL SITE	10	39	99.4
Dwr Cymru Welsh Water	River Rhondda	Trehafod Pumping Station	51	39	99.9
Dwr Cymru Welsh Water	Nant Y Twlc	CSO at Bridgend Road Garth (Point 23)	39	39	97.4
Dwr Cymru Welsh Water	Rhondda River Via A Culvert	Rees Street 71 CSO, Pentre	81	37	96.1
Dwr Cymru Welsh Water	River Rhondda Fach	CSO at Wattstown-Bailey St Land Recla	15	35	71.1
Dwr Cymru Welsh Water	River Rhondda Fach	Blaenllechau Long Row CSO	14	33	80.5
Dwr Cymru Welsh Water	River Rhondda	Herbert St CSO	16	29	99.3
Dwr Cymru Welsh Water	Rhondda Fawr	CSO at Penycraig - Tylacelyn Road	42	27	99.2
Dwr Cymru Welsh Water	Rhondda River Via A Culvert	Old Brithweunydd Road CSO, Tonypandy	38	26	99.9
Dwr Cymru Welsh Water	River Llynfi	Church Street CSO, Maesteg	23	25	80.6
Dwr Cymru Welsh Water	Ogwr Fawr	CORBETT STREET CSO OGMORE VALE	10	23	99.9
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	Nant Clydach	CSO at Tonypandy, Rear of De Winton St	11	17	99.9
Dwr Cymru Welsh Water	River Afan	Afan St CSO	27	16	98
Dwr Cymru Welsh Water	Rhondda Fawr	Treherbert Bute/Corbett/David St Junction CSO	5	15	99.8
Dwr Cymru Welsh Water	Rhondda Fawr	CSO OFF YNYSCYNON ROAD TREALAW	16	15	99.4
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	Rhondda Fach	Cwmparc Railway Terrace CSO	15	13	99.7
Dwr Cymru Welsh Water	River Afan	Blaengwnfi Stormwater Overflow Cham	16	12	99
Dwr Cymru Welsh Water	Rhondda Fach	Dolgwilym River Bridge CSO	13	11	99.8
Dwr Cymru Welsh Water	River Garw	CSO at Victoria Street	15	10	99.5
Dwr Cymru Welsh Water	River Rhondda Fach	James Terrace CSO	8	10	99.9
Dwr Cymru Welsh Water	River Rhondda	River Terrace CSO, Treorchy, Rhondda	23	10	99.9
Dwr Cymru Welsh Water	River Ely	CSO at Tynybryn Road Tonyrefail R-C-T	9	10	99.8
Dwr Cymru Welsh Water	River Rhondda Fawr	Treherbert Ind Est CSO Treherbert	7	8	99.9
Dwr Cymru Welsh Water	River Afan	Pontrhydyfen Road Bridge CSO	19	7	97.5
Dwr Cymru Welsh Water	Rhondda R - Source To Conf River Rhondda Fach	Penygraig Nantgwyn St/Hill St Jn CSO	24	7	99.5
Dwr Cymru Welsh Water	River Llynfi	CSO Cwmfelin (Point 26)	14	5	77.7
Dwr Cymru Welsh Water	River Rhondda Fawr	LEWIS STREET CSO & PUMPING STATION	8	5	99.9
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 Ely	CSO at Penrhiwfer Ashdale Rd CSO, rear of No23	6	4	99.8
Dwr Cymru Welsh Water	Rhondda Fawr River	Rear of William St CSO, Ystrad	7	3	99.8
Dwr Cymru Welsh Water	River Llynfi Via Culvert	Heol Y Llwyni CSO	6	2	99.7
Dwr Cymru Welsh Water	Rhondda Fach	CSO at FURNACE ROAD PONTYGWAITH RCT	9	2	97.7
Dwr Cymru Welsh Water	Nant Y Ffosp	Oakfield Terrace CSO, Nantymoel	8	2	100
Dwr Cymru Welsh Water	River Cynon	Pentre - Llewellyn Street CSO	6	2	99.6
Dwr Cymru Welsh Water	Neath Estuary	BRITON FERRY SPS INNER DOCK NEATH	2	1	99.9
Dwr Cymru Welsh Water	River Rhondda	Cymmer Rd CSO, Porth	4	1	100
Dwr Cymru Welsh Water	Nant Muchydd	Capel Farm PS Emergency Tonyrefai	1	1	99.9
Dwr Cymru Welsh Water	Rhondda Fach River	JUNCT OF BRONDEG AND PENRHYS ST CSO	2	1	99.7
Dwr Cymru Welsh Water	River Ely	Tonyrefail, Mill St CSO	4	1	100
Dwr Cymru Welsh Water	Nant Ystradffernol Via A Culvert	Blaen-y-Cwm Terrace CSO	3	1	90.7
Dwr Cymru Welsh Water	Ogwr Fawr Via A Culverted Watercourse	CSO at End of Railway Terrace, Ogmore Vale	4	1	97.3
Dwr Cymru Welsh Water	Rhondda Fawr	ELISABETH CLOSE CSO PENTRE RCT	2	1	99.9
Dwr Cymru Welsh Water	Rhondda Fawr	CSO at 136 Tyntyla Road, Tonypandy	3	0	99.8
Dwr Cymru Welsh Water	Nant Cymparc	Junction of Sunnyhill & Park Crescent CSO, Cwmparc	3	0	99.3
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	Rhondda Fawr River	2 Clarence St CSO, Pentre	1	0	98.7
Dwr Cymru Welsh Water	Nant Abercerdin Via Surface Water Sewer	CSO Nr Glannant, Heol Heulog	1	0	100
Dwr Cymru Welsh Water	River Rhondda Fach	CSO at Ferndale btw Taff St & Station Rd	1	0	100
Dwr Cymru Welsh Water	River Ely	Mill St CSO, Tonyrefail	1	0	57.8
Dwr Cymru Welsh Water	Ogwr Fawr	OGWR FAWR CSO OGMORE VALE	1	0	79.2
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
Dwr Cymru Welsh Water	River Rhondda Fach	Blaenllechau Taff St CSO	0	0	99.7
Dwr Cymru Welsh Water	River Cynon	CSO Meadow Street Pontycymmer	0	0	100
Dwr Cymru Welsh Water	Rhondda Fach River	East Rd CSO Tylorstown	0	0	99.8
Dwr Cymru Welsh Water	River Rhondda Fawr	GELLI CROSSING PUMPING STATION RHON	0	0	99.9
Dwr Cymru Welsh Water	Rhonda Fawr River	TREORCHY CSO - M/H AT SIDE OF BOYS	0	0	100
Dwr Cymru Welsh Water	Rhondda River	Treherbert - Opposite Railway CSO	0	0	100
Dwr Cymru Welsh Water	Rhondda Fawr	Treherbert Pumping Station, Park Close	0	0	99.9

It's a Dirty Business

Afan Ogwr Rhondda

Polluted by sewage 7,377 times in 2025 lasting 45,980 hours - That's 5.32 years!

Monitoring fell below 50% in some locations so could be more

Afan Ogwr Rhondda

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Totals for Afan Ogwr Rhondda in 2025

144 Sites polluted by Dwr Cymru Welsh Water

Change Over Time

Senedd Constituencies near Afan Ogwr Rhondda

Westminster Constituencies within Afan Ogwr Rhondda

Take Action

We need your support!

Pollution Summary 2025

Data Sources & Accuracy

Media Queries

Please Support Us

It's a Dirty Business

Afan Ogwr Rhondda Polluted by sewage 7,377 times in 2025 lasting 45,980 hours - That's 5.32 years! Monitoring fell below 50% in some locations so could be more

Afan Ogwr Rhondda

Select Another Constituency

Totals for Afan Ogwr Rhondda in 2025

144 Sites polluted by Dwr Cymru Welsh Water

Change Over Time

Senedd Constituencies near Afan Ogwr Rhondda

Westminster Constituencies within Afan Ogwr Rhondda

Take Action

We need your support!

Pollution Summary 2025

Data Sources & Accuracy

Media Queries

Please Support Us

Afan Ogwr Rhondda

Polluted by sewage 7,377 times in 2025 lasting 45,980 hours - That's 5.32 years!

Monitoring fell below 50% in some locations so could be more