Rhondda polluted by sewage 3,726 times in 2023 - lasting 22,257 hours
- 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 Rhondda in 2023
61 Sites polluted by Dwr Cymru Welsh Water
3,726 sewage dumps
22,257 h duration
That's 2.58 years! On average 10.2 times a day
Change Over Time

Pollution Summary 2023

Here are all the reported sewage overflow totals for Rhondda 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 3 of the total 72 CSO locations had reporting enabled for less than half the year, of which 3 had zero reporting.

Company Waterway Site Sewage Dumps Duration (Hours) Reporting %
Dwr Cymru Welsh Water Rhondda River Fawr REGENT ST CSO TREORCHY RHONDDA 177 2,276 99.8
Dwr Cymru Welsh Water River Rhondda Brook Street Combined Sewer Overflow 202 2,008 99.9
Dwr Cymru Welsh Water Nant Clydach A CSO at Clydach Vale Davies Street 152 1,243 98.3
Dwr Cymru Welsh Water Rhondda Fawr Ton Pentre PS CSOTont Pentre RCT 178 1,241 95.6
Dwr Cymru Welsh Water River Rhondda Fach CSO at CROSS STREET YNYSHIR R-C-T 135 1,199 100
Dwr Cymru Welsh Water Rhondda River Via A Culvert Rees Street 71 CSO, Pentre 89 1,186 33.1
Dwr Cymru Welsh Water River Rhondda Fawr Rear of Richards Terrace CSO 108 1,141 99.2
Dwr Cymru Welsh Water River Rhondda Fach R/O Tylorstown Primary School CSO, Tylorstown 142 1,118 98.7
Dwr Cymru Welsh Water River Rhondda Fach Maerdy Station Road CSO 124 883 95.9
Dwr Cymru Welsh Water River Rhondda Fach Ferndale Road CSO Tylorstown RCT 91 860 99.1
Dwr Cymru Welsh Water River Rhondda Fach Station Rd CSO, Ferndale 142 855 98.7
Dwr Cymru Welsh Water River Rhondda Fach Ferndale Banana Tip CSO Additional 65 744 72.1
Dwr Cymru Welsh Water River Rhondda Fach Rear of Fir St CSO, Ferndale 111 686 98.7
Dwr Cymru Welsh Water Rhondda Fawr Station Rd CSO, Dinas, Porth 122 616 89.7
Dwr Cymru Welsh Water Rhondda Fawr Gelligaled Pk CSO Ystrad Rhondda 123 615 98.3
Dwr Cymru Welsh Water Rhondda Fawr River CSO GYLFACH ROAD PORTH RHONDDA 123 608 96
Dwr Cymru Welsh Water Nant Clydach CSO at Tonypandy, Rear of De Winton St 86 506 98.5
Dwr Cymru Welsh Water Rhondda Fach CSO at Blaenllechau School St 97 479 98.3
Dwr Cymru Welsh Water River Rhondda Fach FERNDALE BANANA TIP CSO 101 437 98.9
Dwr Cymru Welsh Water Rhondda R - Source To Conf River Rhondda Fach Penygraig Rd CSO, Penygraig 100 368 98.3
Dwr Cymru Welsh Water River Rhondda Fach Rear of Blake St CSO, Maerdy 69 362 99.2
Dwr Cymru Welsh Water Rhondda Fawr River GLANNANT ST/DINAS ROAD CSO 89 327 99.1
Dwr Cymru Welsh Water Rhondda Fach FERNDALE BANANA TIP SSO OLD SCHOOL 91 254 100
Dwr Cymru Welsh Water Rhondda Fawr CSO O/S Welcome Inn, Tylacelyn Rd, Penygraig 100 246 99.1
Dwr Cymru Welsh Water River Rhondda Fach Blaenllechau Taff St CSO 64 238 97.5
Dwr Cymru Welsh Water Nant Clydach Railway Terrace CSO, Clydach Vale 67 174 99.6
Dwr Cymru Welsh Water River Rhondda A Combined Sewer Overflow, Trehafod 13 162 95.1
Dwr Cymru Welsh Water River Rhondda Fach Highfield Industrial Estate CSO, Ferndale 36 158 96.3
Dwr Cymru Welsh Water Rhondda Fawr River Blaencwm Rd/Tydraw Terrace CSO 42 154 99.6
Dwr Cymru Welsh Water Rhondda River CSO at Rear of George Street, Treherbert 46 125 56.9
Dwr Cymru Welsh Water River Rhondda Llwynypia Rd CSO, Tonypandy 73 124 99.1
Dwr Cymru Welsh Water Rhondda Fach River PONTYGWAITH BRIDGE CSO ASSET 71188 61 107 98.1
Dwr Cymru Welsh Water River Rhondda Fach CSO OPP 37 EDMONDES ST TYLORSTOWN 39 104 96.6
Dwr Cymru Welsh Water Rhondda Fawr CSO to rear of 8 Griffin Park 36 103 100
Dwr Cymru Welsh Water River Rhondda Trehafod Pumping Station 80 87 99.8
Dwr Cymru Welsh Water Rhondda Fawr REES STREET PUMPING STATION GELLI 35 54 99.8
Dwr Cymru Welsh Water Rhondda River Via A Culvert Old Brithweunydd Road CSO, Tonypandy 57 49 99.8
Dwr Cymru Welsh Water Rhondda Fach CSO at Blaenllechau Commercial & George St Jn 15 45 99.1
Dwr Cymru Welsh Water River Rhondda River Terrace CSO, Treorchy, Rhondda 44 39 100
Dwr Cymru Welsh Water Rhondda Fawr CSO at Penycraig - Tylacelyn Road 35 33 94
Dwr Cymru Welsh Water Rhondda Fawr CSO OFF YNYSCYNON ROAD TREALAW 13 23 100
Dwr Cymru Welsh Water Rhondda River Fawr Llwynypia SPS 9 23 100
Dwr Cymru Welsh Water Rhondda Fach Cwmparc Railway Terrace CSO 15 23 99.8
Dwr Cymru Welsh Water River Rhondda Fach CSO at Wattstown-Bailey St Land Recla 7 22 18.7
Dwr Cymru Welsh Water River Rhondda Fach Blaenllechau Long Row CSO 7 21 99.9
Dwr Cymru Welsh Water River Rhondda Fach Aberrhondda Road CSO 14 18 40.5
Dwr Cymru Welsh Water River Rhondda Fach James Terrace CSO 17 18 96.7
Dwr Cymru Welsh Water River Rhondda Fawr Treherbert Ind Est CSO Treherbert 8 13 99.9
Dwr Cymru Welsh Water Rhondda Fawr Treherbert Bute/Corbett/David St Junction CSO 8 11 100
Dwr Cymru Welsh Water Rhondda Fach Dolgwilym River Bridge CSO 5 10 99.9
Dwr Cymru Welsh Water Rhondda Fach River JUNCT OF BRONDEG AND PENRHYS ST CSO 6 9 100
Dwr Cymru Welsh Water River Rhondda Fawr LEWIS STREET CSO & PUMPING STATION 11 8 100
Dwr Cymru Welsh Water Rhondda Fawr ELISABETH CLOSE CSO PENTRE RCT 11 8 100
Dwr Cymru Welsh Water Rhondda Fawr River Rear of William St CSO, Ystrad 5 6 99.1
Dwr Cymru Welsh Water Rhondda R - Source To Conf River Rhondda Fach Penygraig Nantgwyn St/Hill St Jn CSO 14 5 99.6
Dwr Cymru Welsh Water Nant Ystradffernol Via A Culvert Blaen-y-Cwm Terrace CSO 8 4 99.7
Dwr Cymru Welsh Water River Rhondda Fach Ferndale Banana Tip No.1 CSO 2 1 1.9
Dwr Cymru Welsh Water River Rhondda Fach CSO at Ferndale btw Taff St & Station Rd 3 0 100
Dwr Cymru Welsh Water River Rhondda Cymmer Rd CSO, Porth 1 0 100
Dwr Cymru Welsh Water Rhondda Fawr River 2 Clarence St CSO, Pentre 1 0 100
Dwr Cymru Welsh Water Rhondda Fawr CSO at 136 Tyntyla Road, Tonypandy 1 0 73.2
Dwr Cymru Welsh Water River Rhondda Fawr CSO at Junct Ystrad/Church Road Ystrad 0 0 0
Dwr Cymru Welsh Water Rhondda Fach River East Rd CSO Tylorstown 0 0 57.4
Dwr Cymru Welsh Water Rhondda Fach CSO at FURNACE ROAD PONTYGWAITH RCT 0 0 100
Dwr Cymru Welsh Water River Cynon Pentre - Llewellyn Street CSO 0 0 99.7
Dwr Cymru Welsh Water Rhondda River Treherbert - Opposite Railway CSO 0 0 100
Dwr Cymru Welsh Water River Rhondda Fawr GELLI CROSSING PUMPING STATION RHON 0 0 100
Dwr Cymru Welsh Water River Rhondda Herbert St CSO 0 0 0
Dwr Cymru Welsh Water Rhondda Fawr Treherbert Pumping Station, Park Close 0 0 99.8
Dwr Cymru Welsh Water Nant Cymparc Junction of Sunnyhill & Park Crescent CSO, Cwmparc 0 0 0
Dwr Cymru Welsh Water River Rhondda CSO AT CADWGAN TERRACE TREHAFOD 0 0 100
Dwr Cymru Welsh Water Rhonda Fawr River TREORCHY CSO - M/H AT SIDE OF BOYS 0 0 95.3

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.