Top of the Poops | Constituency Sewage Map

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View Annual Sewage Data

You're looking at the totals that we have calculated for sewage in Pontypridd so far for 2026. It is an estimate, based on very poor quality live data from the Water Companies. The water companies report their sewage to the Environment Agency every year in April. You can see the last reported year in the other page

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.

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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	95	1,756h 45m	-
Dwr Cymru Welsh Water	Parish Road Beddau Storm Overflow	Nant Myddlyn	114	1,547h 5m	-
Dwr Cymru Welsh Water	River Row Abercynon Overflow	River Cynon	63	1,067h 20m	-
Dwr Cymru Welsh Water	Glynmynach Street Storm Overflow	Nant Clydach	70	891h 30m	-
Dwr Cymru Welsh Water	Dyffryn Isaf WwTW Storm Overflow	River Ely	46	694h 15m	-
Dwr Cymru Welsh Water	Tonteg Road Taff Vale Storm Overflow	River Taff	64	632h 48m	-
Dwr Cymru Welsh Water	Pontcynon Pipe Bridge Storm Overflow	River Cynon	54	584h 13m	-
Dwr Cymru Welsh Water	Abercynon Wood Road Storm Overflow	River Taff	44	437h 30m	-
Dwr Cymru Welsh Water	Robert Street Storm Overflow	Nant Clydach	45	264h 50m	-
Dwr Cymru Welsh Water	Llanharan Storage Storm Overflow	Ewenni Fach River	39	249h 14m	-
Dwr Cymru Welsh Water	Crossbrook Street Storm Overflow	River Taff	37	183h 39m	-
Dwr Cymru Welsh Water	Bethlehem View Fields Storm Overflow	Ewenni Fach River	47	120h 59m	-
Dwr Cymru Welsh Water	Lanelay Park Storm Overflow	River Ely	43	102h 12m	-
Dwr Cymru Welsh Water	Treforest Lewistown Park Overflow	River Taff	14	100h 11m	-
Dwr Cymru Welsh Water	Cynon WwTW Storm Overflow	River Taff	7	95h 15m	-
Dwr Cymru Welsh Water	Miskin Road Railway Storm Overflow	River Cynon	24	91h 30m	-
Dwr Cymru Welsh Water	South of Lee Street Storm Overflow	River Rhondda	25	91h 16m	-
Dwr Cymru Welsh Water	Gyfeillon Gardens Storm Overflow	River Rhondda	46	82h 9m	-
Dwr Cymru Welsh Water	James Street Junction Overflow	River Taff	18	81h 56m	-
Dwr Cymru Welsh Water	Old Parish Road Storm Overflow	Nant Clydach	28	57h 17m	-
Dwr Cymru Welsh Water	Cribbyn-Ddu Street Junction Storm Overflow	River Clydach	13	56h 40m	-
Dwr Cymru Welsh Water	Ynysangharad Park Pontypridd Storm Overflow	River Taff	54	53h 26m	-
Dwr Cymru Welsh Water	Oxford Street Miskin Road Storm Overflow	River Cynon	16	43h 15m	-
Dwr Cymru Welsh Water	Clydach Road Ynysybwl Storm Overflow	Nant Clydach	15	38h 44m	-
Dwr Cymru Welsh Water	Cardiff Road Talbot Green Storm Overflow	River Clun	14	32h 28m	-
Dwr Cymru Welsh Water	Penycoedcae Storm Overflow	Tributary of Nant Tyrarlwudd	27	26h 21m	-
Dwr Cymru Welsh Water	Ynysybwl Road Taff Vale Overflow	River Taff	27	26h 20m	-
Dwr Cymru Welsh Water	Glassbrook Terrace Storm Overflow	River Cynon	11	12h 41m	-
Dwr Cymru Welsh Water	Pavia Court Storm Overflow	River Rhondda	6	11h 27m	-
Dwr Cymru Welsh Water	Heol Saelm Garages Storm Overflow	Nant Arian	8	11h	-
Dwr Cymru Welsh Water	Duffryn Road Mountain Ash Overflow	River Cynon	3	8h 31m	-
Dwr Cymru Welsh Water	Lionel Terrace Storm Overflow	River Taff	4	7h 30m	-
Dwr Cymru Welsh Water	Park Road Abercynon Storm Overflow	Sirhowy River	4	7h 23m	-
Dwr Cymru Welsh Water	Clydach Terrace Storm overflow	Nant Clydach	7	6h 28m	-
Dwr Cymru Welsh Water	Penrhiwceiber Point D Storm Overflow	River Cynon	10	5h 27m	-
Dwr Cymru Welsh Water	New Road Mountain Ash Storm Overflow	River Cynon	5	4h 13m	-
Dwr Cymru Welsh Water	West Street Pontypridd Storm Overflow	River Taff	3	3h 28m	-
Dwr Cymru Welsh Water	Bailey Street Storm Overflow	River Cynon	2	2h 59m	-
Dwr Cymru Welsh Water	Castle Inn Bridge Storm Overflow	River Taff	3	2h 43m	-
Dwr Cymru Welsh Water	Penrhiwceiber Station Storm Overflow	River Cynon	5	2h 23m	-
Dwr Cymru Welsh Water	Heol Miles Storm Overflow	River Ely	3	1h 59m	-
Dwr Cymru Welsh Water	Ty Mawr Road Pontypridd Overflow	River Rhondda	3	1h 14m	-
Dwr Cymru Welsh Water	Poplar Road Rhydyfelin Overflow	River Taff	1	0h 23m	-
Dwr Cymru Welsh Water	Sheppard Street Storm Overflow	River Rhondda	1	0h 15m	-
Dwr Cymru Welsh Water	Park Place Clifnydd 2 Storm Overflow	Nant Cae-Dudwg	1	0h 15m	-
Dwr Cymru Welsh Water	Martins Terrace Abercynon Overflow	River Taff	1	0h 13m	-
Dwr Cymru Welsh Water	Maesycoe Lanelay Crescent Storm Overflow	River Rhondda	0	0h	-
Dwr Cymru Welsh Water	Hamilton Street Storm Overflow	River Cynon	0	0h	-
Dwr Cymru Welsh Water	St Annes Drive Llantwit Fardre Overflow	Nant Clun	0	0h	-
Dwr Cymru Welsh Water	High Street Pontypridd Overflow	River Taff	0	0h	-
Dwr Cymru Welsh Water	Unknown	Unknown	0	0h	-
Dwr Cymru Welsh Water	Bridgend Road Llanharan Overflow	River Ewenni	0	0h	-
Dwr Cymru Welsh Water	Brynteg Park Storm Overflow	Nant Cymdda Bach	0	0h	-
Dwr Cymru Welsh Water	Cynon Terrace Penrhiwceiber Overflow	River Cynon	0	0h	-
Dwr Cymru Welsh Water	Cardiff Road Pontypridd Storm Overflow	River Taff	0	0h	-
Dwr Cymru Welsh Water	Low Row Cwmpennar Storm Overflow	Tributary of River Cynon	0	0h	-
Dwr Cymru Welsh Water	Llantwit Road Storm Overflow	River Taff	0	0h	-
Dwr Cymru Welsh Water	Cardiff Road Mountain Ash 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	Mill Street Pontypridd Storm Overflow	River Rhondda	0	0h	-
Dwr Cymru Welsh Water	Alexandra Road Pontypridd Overflow	River Taff	0	0h	-
Dwr Cymru Welsh Water	Unknown	Unknown	0	0h	-
Dwr Cymru Welsh Water	Ynysangharad Park Bridge Storm Overflow	River Taff	0	0h	-
Dwr Cymru Welsh Water	Park Place Cilfnydd 1 Storm Overflow	Nant Caedudwg	0	0h	-
Dwr Cymru Welsh Water	Park Hill Mountain Ash Overflow	River Cynon	0	0h	-
Dwr Cymru Welsh Water	Pwllgwaun Road Storm Overflow	River Rhondda	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

1,756h 45m

Dwr Cymru Welsh Water

Parish Road Beddau Storm Overflow