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March for Clean Water

Pontypridd was polluted by sewage 3,090 times in 2023
lasting 22,581 hours - that's 2.61 years!
- but monitoring was disabled in some locations, so could be more

© OpenStreetMap contributors
Contains OS Data © Crown copyright & database right 2021-2023
© Top of the Poops 2021-2023
✔ means we have experimental daily data since 2023
Totals for Pontypridd in 2023
42 Sites polluted by Dwr Cymru Welsh Water
3,090 sewage dumps
22,581 h duration
That's 2.61 years! On average 8.5 times a day
Change Over Time
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Constituencies near Pontypridd
Waterways in Pontypridd

Pollution Summary 2023

Here are all the reported sewage overflow totals for Pontypridd in 2023. 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 52 CSO locations had reporting enabled for less than half the year, of which 1 had zero reporting.

Company Waterway Site Sewage Dumps Duration (Hours) Reporting %
Dwr Cymru Welsh Water River Taff Settled Storm at Cynon Valley Wastewater Treatment Works 167 2,789 99.8
Dwr Cymru Welsh Water River Taff Cilfynydd STW Cilfynydd Pontypridd Settled Storm 146 2,461 100
Dwr Cymru Welsh Water River Ely DUFFRYN ISAF SEWAGE TREATMENT WORKS 135 2,285 100
Dwr Cymru Welsh Water Ewenny Fach CSO at Hillside Avenue Llanharan 191 2,182 90.6
Dwr Cymru Welsh Water River Taff Tonteg Road, Upper Boat CSO and Pumping Station Emergency Overflow 160 1,486 100
Dwr Cymru Welsh Water River Taff CASTLE INN CSO ASSET NO 32280 157 1,277 97.1
Dwr Cymru Welsh Water Nant Myddlyn CSO ADJACENT TO PARISH ROAD BEDDA 166 1,254 98.3
Dwr Cymru Welsh Water Ewenni Fach CSO SOUTH OF RAILWAY LLANHAREN 124 1,227 100
Dwr Cymru Welsh Water River Cynon PONTCYNON PIPE BRIDGE CSO ABERCYNON 110 1,127 96.7
Dwr Cymru Welsh Water Nant Clydach Tank Near Pit CSO Ynysybwl 135 882 98.4
Dwr Cymru Welsh Water River Rhondda CSO at Pwllgwuan Syphons, Millfield, Pontypridd 137 599 98.4
Dwr Cymru Welsh Water Nant Clydach GLYN STREET CSO GLYN ST YNYSYBWL 117 558 98.6
Dwr Cymru Welsh Water River Ely Lanelay Park - CSO 117 550 100
Dwr Cymru Welsh Water River Taff Abercynon Wood Rd SPS 79 511 100
Dwr Cymru Welsh Water River Cynon CSO Opposite Miskin Hotel, far side of railway 102 425 98.9
Dwr Cymru Welsh Water River Cynon Oxford St CSO, Mountain Ash 69 409 49.4
Dwr Cymru Welsh Water River Clun Penygawsi CSO 60 351 100
Dwr Cymru Welsh Water River Rhondda A COMBINED SEWER OVERFLOW GYFEILLON 67 332 99.9
Dwr Cymru Welsh Water River Taff YNYSANGHARAD PARK CSO 91 319 99.9
Dwr Cymru Welsh Water Nant Clydach CSO at Clydach Rd, Ynysbwl 44 163 82.8
Dwr Cymru Welsh Water River Cynon Glassbrook Terrace CSO, Penrhiwceiber 57 132 99.3
Dwr Cymru Welsh Water River Taff Crossbrook St CSO, Pontypridd 60 128 95.8
Dwr Cymru Welsh Water River Taff Rhydfelin CSO Off Lionel Terrace 17 128 79.1
Dwr Cymru Welsh Water Nant Arian New Society Garage CSO 54 126 100
Dwr Cymru Welsh Water River Clun Via An Unnamed Ditch Talbot Green CSO 66 108 71.3
Dwr Cymru Welsh Water River Cynon Duffryn Rd Mount 2 CSO 32 96 99.8
Dwr Cymru Welsh Water River Rhondda Pellgwaun CSO 34 92 99.8
Dwr Cymru Welsh Water Nant Clydach CSO O/S 2 Clydach Terrace, Ynysybwl 25 90 81.5
Dwr Cymru Welsh Water Rhondda River Pavia Courth CSO, Pontypridd 70 80 98.6
Dwr Cymru Welsh Water Nant Tyrarlwudd Penycoedcae SPS 80 78 99.7
Dwr Cymru Welsh Water River Cynon Penrhiwceiber Point D CSO 49 70 99.6
Dwr Cymru Welsh Water River Cynon NEWTOWN COMMUNITY HALL CSO 34 63 99.7
Dwr Cymru Welsh Water R Cynon - Conf Aman R To Conf R Taff Station Terrace CSO, Penrhiwceiber 32 49 85.7
Dwr Cymru Welsh Water Nant Clydach Old Parish Road CSO, Ynysbwl 16 30 16.3
Dwr Cymru Welsh Water River Rhondda Lower Mill Street CSO Pontypridd 13 28 100
Dwr Cymru Welsh Water Nant Cymdda Bach Brynteg Park Pumping Station Beddau 8 21 100
Dwr Cymru Welsh Water River Taff Pontypridd West Street CSO 40 20 99.8
Dwr Cymru Welsh Water Nant Cae-Dudwg End of Park Place CSO, Cilfynydd 8 17 99.8
Dwr Cymru Welsh Water River Taff YNYSANGHARAD HIGH LEVEL RELIEF CSO 2 9 99.9
Dwr Cymru Welsh Water R Taff - Conf Rhondda R To Castle Street CSO at Treforest Llantwit Rd A 3 7 64.1
Dwr Cymru Welsh Water River Rhondda Lanelay Crescent CSO, Maesycoed 14 5 99.3
Dwr Cymru Welsh Water River Taff Sion Street Sewage Pumping Station 2 4 99.7
Dwr Cymru Welsh Water Taff Cardiff Road CSO, Pontypridd 0 0 39.2
Dwr Cymru Welsh Water River Cynon Abercynon Rugby Club CSO 0 0 99.5
Dwr Cymru Welsh Water Nant Cae-Dudwg PARK PLACE CSO 0 0 100
Dwr Cymru Welsh Water River Rhondda Pwllgwaun Rd CSO, pontypridd 0 0 100
Dwr Cymru Welsh Water River Taff Taff St CSO, Pontypridd 0 0 58.5
Dwr Cymru Welsh Water Culvert NEW ROAD SEWERAGE SYSTEM (REDESIGNE 0 0 0
Dwr Cymru Welsh Water River Cynon TOWN HALL 0 0 99.9
Dwr Cymru Welsh Water River Cynon No 10 Hamilton St CSO, Mountain Ash 0 0 40.7
Dwr Cymru Welsh Water River Cynon Cwmpennar CSO, Adj Low Rd, Mountain Ash 0 0 9.2
Dwr Cymru Welsh Water River Nant Felin Fach Llanharry SPS 0 0 100

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.

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