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.

Totals for Pontypridd in 2026

Sewage11,477 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	104	1,875h 48m	-
Dwr Cymru Welsh Water	Parish Road Beddau Storm Overflow	Nant Myddlyn	141	1,740h 56m	-
Dwr Cymru Welsh Water	River Row Abercynon Overflow	River Cynon	75	1,226h 17m	-
Dwr Cymru Welsh Water	Glynmynach Street Storm Overflow	Nant Clydach	79	926h 4m	-
Dwr Cymru Welsh Water	Dyffryn Isaf WwTW Storm Overflow	River Ely	57	855h 44m	-
Dwr Cymru Welsh Water	Tonteg Road Taff Vale Storm Overflow	River Taff	86	788h 29m	-
Dwr Cymru Welsh Water	Pontcynon Pipe Bridge Storm Overflow	River Cynon	66	693h 23m	-
Dwr Cymru Welsh Water	Abercynon Wood Road Storm Overflow	River Taff	48	452h 45m	-
Dwr Cymru Welsh Water	Robert Street Storm Overflow	Nant Clydach	57	349h 49m	-
Dwr Cymru Welsh Water	Llanharan Storage Storm Overflow	Ewenni Fach River	50	332h 27m	-
Dwr Cymru Welsh Water	Crossbrook Street Storm Overflow	River Taff	48	246h 4m	-
Dwr Cymru Welsh Water	Bethlehem View Fields Storm Overflow	Ewenni Fach River	59	195h 57m	-
Dwr Cymru Welsh Water	Gyfeillon Gardens Storm Overflow	River Rhondda	72	188h 4m	-
Dwr Cymru Welsh Water	Lanelay Park Storm Overflow	River Ely	63	158h 27m	-
Dwr Cymru Welsh Water	Ynysangharad Park Pontypridd Storm Overflow	River Taff	76	143h 9m	-
Dwr Cymru Welsh Water	South of Lee Street Storm Overflow	River Rhondda	32	124h 57m	-
Dwr Cymru Welsh Water	Miskin Road Railway Storm Overflow	River Cynon	31	122h 39m	-
Dwr Cymru Welsh Water	Treforest Lewistown Park Overflow	River Taff	19	114h 41m	-
Dwr Cymru Welsh Water	Castle Inn Bridge Storm Overflow	River Taff	14	104h 26m	-
Dwr Cymru Welsh Water	Cynon WwTW Storm Overflow	River Taff	7	95h 15m	-
Dwr Cymru Welsh Water	James Street Junction Overflow	River Taff	20	83h	-
Dwr Cymru Welsh Water	Cribbyn-Ddu Street Junction Storm Overflow	River Clydach	15	75h 22m	-
Dwr Cymru Welsh Water	Old Parish Road Storm Overflow	Nant Clydach	33	71h 50m	-
Dwr Cymru Welsh Water	Park Road Abercynon Storm Overflow	Sirhowy River	9	70h 8m	-
Dwr Cymru Welsh Water	Cardiff Road Talbot Green Storm Overflow	River Clun	20	63h 54m	-
Dwr Cymru Welsh Water	Clydach Road Ynysybwl Storm Overflow	Nant Clydach	19	59h 24m	-
Dwr Cymru Welsh Water	Oxford Street Miskin Road Storm Overflow	River Cynon	23	50h 46m	-
Dwr Cymru Welsh Water	Ynysybwl Road Taff Vale Overflow	River Taff	33	36h 19m	-
Dwr Cymru Welsh Water	Penycoedcae Storm Overflow	Tributary of Nant Tyrarlwudd	33	35h 50m	-
Dwr Cymru Welsh Water	Heol Saelm Garages Storm Overflow	Nant Arian	13	29h	-
Dwr Cymru Welsh Water	Clydach Terrace Storm overflow	Nant Clydach	12	23h 43m	-
Dwr Cymru Welsh Water	Pavia Court Storm Overflow	River Rhondda	13	20h 4m	-
Dwr Cymru Welsh Water	Glassbrook Terrace Storm Overflow	River Cynon	13	13h 40m	-
Dwr Cymru Welsh Water	Penrhiwceiber Point D Storm Overflow	River Cynon	12	12h 25m	-
Dwr Cymru Welsh Water	St Annes Drive Llantwit Fardre Overflow	Nant Clun	3	11h 27m	-
Dwr Cymru Welsh Water	Lionel Terrace Storm Overflow	River Taff	5	11h 13m	-
Dwr Cymru Welsh Water	Penrhiwceiber Station Storm Overflow	River Cynon	6	10h 37m	-
Dwr Cymru Welsh Water	Heol Miles Storm Overflow	River Ely	6	10h 27m	-
Dwr Cymru Welsh Water	Mill Street Pontypridd Storm Overflow	River Rhondda	2	9h 59m	-
Dwr Cymru Welsh Water	Duffryn Road Mountain Ash Overflow	River Cynon	3	8h 31m	-
Dwr Cymru Welsh Water	Brynteg Park Storm Overflow	Nant Cymdda Bach	1	8h 14m	-
Dwr Cymru Welsh Water	Llantwit Road Storm Overflow	River Taff	1	6h 59m	-
Dwr Cymru Welsh Water	New Road Mountain Ash Storm Overflow	River Cynon	6	4h 42m	-
Dwr Cymru Welsh Water	Ty Mawr Road Pontypridd Overflow	River Rhondda	4	4h 30m	-
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	Maesycoe Lanelay Crescent Storm Overflow	River Rhondda	1	1h 43m	-
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	Hamilton Street Storm Overflow	River Cynon	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	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	Cardiff Road Mountain Ash Storm Overflow	River Cynon	0	0h	-
Dwr Cymru Welsh Water	Unknown	Unknown	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	-
Dwr Cymru Welsh Water	High Street Pontypridd Overflow	River Taff	0	0h	-
Dwr Cymru Welsh Water	Cardiff Road Pontypridd Storm Overflow	River Taff	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	-
Dwr Cymru Welsh Water	Ynysangharad Park Bridge Storm 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

104

1,875h 48m

Dwr Cymru Welsh Water