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View Annual Sewage Data

You're looking at the totals that we have calculated for sewage in Pontypridd for 2025. It is an estimate, based on very poor quality live data from the Water Companies. This may not align with the 'official' reported sewage values from the water companies, which is reported in April following then end of the year - so 2025 numbers are reported in April 2026.

What's a potential overflow? If the CSO goes 'Offline' while its Overflowing, we don't know if it stopped overflowing until we get a 'Stop' event.

Totals for Pontypridd in 2025

Sewage13,622 hours

Monitoring offline0 hours

Potential pollution0 hours

Storm overflows67

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Constituencies near Pontypridd

Company	Site Name	Receiving Waterway	Overflow Days	Total Duration (hours)	Offline/Potential Pollution
Dwr Cymru Welsh Water	Cilfynydd WwTW Storm Overflow	River Taff	113	1,715h 52m	-
Dwr Cymru Welsh Water	River Row Abercynon Overflow	River Cynon	104	1,432h 51m	-
Dwr Cymru Welsh Water	Pontcynon Pipe Bridge Storm Overflow	River Cynon	70	911h 52m	-
Dwr Cymru Welsh Water	Tonteg Road Taff Vale Storm Overflow	River Taff	98	750h 2m	-
Dwr Cymru Welsh Water	Oxford Street Miskin Road Storm Overflow	River Cynon	81	744h 34m	-
Dwr Cymru Welsh Water	Parish Road Beddau Storm Overflow	Nant Myddlyn	107	710h 50m	-
Dwr Cymru Welsh Water	Dyffryn Isaf WwTW Storm Overflow	River Ely	54	671h 25m	-
Dwr Cymru Welsh Water	Abercynon Wood Road Storm Overflow	River Taff	52	639h 14m	-
Dwr Cymru Welsh Water	Glynmynach Street Storm Overflow	Nant Clydach	82	612h 25m	-
Dwr Cymru Welsh Water	Gyfeillon Gardens Storm Overflow	River Rhondda	109	536h 26m	-
Dwr Cymru Welsh Water	Unknown	Unknown	41	465h 18m	-
Dwr Cymru Welsh Water	Bethlehem View Fields Storm Overflow	Ewenni Fach River	65	457h 44m	-
Dwr Cymru Welsh Water	South of Lee Street Storm Overflow	River Rhondda	82	384h 55m	-
Dwr Cymru Welsh Water	Robert Street Storm Overflow	Nant Clydach	65	354h 20m	-
Dwr Cymru Welsh Water	Crossbrook Street Storm Overflow	River Taff	47	327h 6m	-
Dwr Cymru Welsh Water	Lanelay Park Storm Overflow	River Ely	74	275h 6m	-
Dwr Cymru Welsh Water	Treforest Lewistown Park Overflow	River Taff	66	270h 32m	-
Dwr Cymru Welsh Water	Miskin Road Railway Storm Overflow	River Cynon	55	241h 24m	-
Dwr Cymru Welsh Water	Old Parish Road Storm Overflow	Nant Clydach	66	224h 43m	-
Dwr Cymru Welsh Water	Llanharan Storage Storm Overflow	Ewenni Fach River	59	223h 44m	-
Dwr Cymru Welsh Water	Cardiff Road Talbot Green Storm Overflow	River Clun	68	212h 29m	-
Dwr Cymru Welsh Water	Clydach Road Ynysybwl Storm Overflow	Nant Clydach	32	178h 52m	-
Dwr Cymru Welsh Water	Ynysangharad Park Pontypridd Storm Overflow	River Taff	71	168h 9m	-
Dwr Cymru Welsh Water	Cribbyn-Ddu Street Junction Storm Overflow	River Clydach	20	160h 41m	-
Dwr Cymru Welsh Water	Lionel Terrace Storm Overflow	River Taff	25	142h 2m	-
Dwr Cymru Welsh Water	Duffryn Road Mountain Ash Overflow	River Cynon	28	95h 33m	-
Dwr Cymru Welsh Water	Heol Saelm Garages Storm Overflow	Nant Arian	29	76h 36m	-
Dwr Cymru Welsh Water	Clydach Terrace Storm overflow	Nant Clydach	31	76h 34m	-
Dwr Cymru Welsh Water	West Street Pontypridd Storm Overflow	River Taff	49	73h 2m	-
Dwr Cymru Welsh Water	Pavia Court Storm Overflow	River Rhondda	33	66h 14m	-
Dwr Cymru Welsh Water	Glassbrook Terrace Storm Overflow	River Cynon	31	65h 3m	-
Dwr Cymru Welsh Water	Castle Inn Bridge Storm Overflow	River Taff	21	60h 23m	-
Dwr Cymru Welsh Water	New Road Mountain Ash Storm Overflow	River Cynon	22	55h 1m	-
Dwr Cymru Welsh Water	Penrhiwceiber Station Storm Overflow	River Cynon	21	34h 44m	-
Dwr Cymru Welsh Water	Ynysybwl Road Taff Vale Overflow	River Taff	39	31h 1m	-
Dwr Cymru Welsh Water	Penycoedcae Storm Overflow	Tributary of Nant Tyrarlwudd	47	28h 25m	-
Dwr Cymru Welsh Water	Penrhiwceiber Point D Storm Overflow	River Cynon	17	27h 42m	-
Dwr Cymru Welsh Water	James Street Junction Overflow	River Taff	12	14h 45m	-
Dwr Cymru Welsh Water	Sheppard Street Storm Overflow	River Rhondda	11	13h 1m	-
Dwr Cymru Welsh Water	Cynon WwTW Storm Overflow	River Taff	3	11h 45m	-
Dwr Cymru Welsh Water	High Street Pontypridd Overflow	River Taff	7	10h 57m	-
Dwr Cymru Welsh Water	Heol Miles Storm Overflow	River Ely	14	10h 33m	-
Dwr Cymru Welsh Water	Mill Street Pontypridd Storm Overflow	River Rhondda	4	8h 45m	-
Dwr Cymru Welsh Water	Ty Mawr Road Pontypridd Overflow	River Rhondda	4	8h 33m	-
Dwr Cymru Welsh Water	Brynteg Park Storm Overflow	Nant Cymdda Bach	5	8h 5m	-
Dwr Cymru Welsh Water	Martins Terrace Abercynon Overflow	River Taff	7	7h 57m	-
Dwr Cymru Welsh Water	St Annes Drive Llantwit Fardre Overflow	Nant Clun	7	4h 49m	-
Dwr Cymru Welsh Water	Park Place Clifnydd 2 Storm Overflow	Nant Cae-Dudwg	7	4h 44m	-
Dwr Cymru Welsh Water	Ynysangharad Park Bridge Storm Overflow	River Taff	2	4h 15m	-
Dwr Cymru Welsh Water	Maesycoe Lanelay Crescent Storm Overflow	River Rhondda	7	3h 6m	-
Dwr Cymru Welsh Water	Park Hill Mountain Ash Overflow	River Cynon	3	2h 58m	-
Dwr Cymru Welsh Water	Llantwit Road Storm Overflow	River Taff	4	2h 29m	-
Dwr Cymru Welsh Water	Cardiff Road Mountain Ash Storm Overflow	River Cynon	4	1h	-
Dwr Cymru Welsh Water	Pwllgwaun Road Storm Overflow	River Rhondda	3	1h	-
Dwr Cymru Welsh Water	Bridgend Road Llanharan Overflow	River Ewenni	1	0h 21m	-
Dwr Cymru Welsh Water	Cardiff Road Pontypridd Storm Overflow	River Taff	1	0h 14m	-
Dwr Cymru Welsh Water	Hamilton Street Storm Overflow	River Cynon	0	0h	-
Dwr Cymru Welsh Water	Unknown	Unknown	0	0h	-
Dwr Cymru Welsh Water	Park Road Abercynon Storm Overflow	Sirhowy River	0	0h	-
Dwr Cymru Welsh Water	Cynon Terrace Penrhiwceiber Overflow	River Cynon	0	0h	-
Dwr Cymru Welsh Water	Low Row Cwmpennar Storm Overflow	Tributary of River Cynon	0	0h	-
Dwr Cymru Welsh Water	Park Place Cilfnydd 1 Storm Overflow	Nant Caedudwg	0	0h	-
Dwr Cymru Welsh Water	Poplar Road Rhydyfelin Overflow	River Taff	0	0h	-
Dwr Cymru Welsh Water	Bailey Street Storm Overflow	River Cynon	0	0h	-
Dwr Cymru Welsh Water	Woodland Street Storm Overflow	Afon River	0	0h	-
Dwr Cymru Welsh Water	Glyn Dwr Avenue Pontypridd Overflow	River Taff	0	0h	-
Dwr Cymru Welsh Water	Alexandra Road Pontypridd Overflow	River Taff	0	0h	-

Company

Site Name

Receiving Waterway

Overflow Days

Total Duration (hours)

Offline/Potential Pollution

Dwr Cymru Welsh Water

Cilfynydd WwTW Storm Overflow

River Taff

113

1,715h 52m

Dwr Cymru Welsh Water