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Polluted by sewage 1,639 times in 2025 lasting 15,578 hours - That's 1.8 years!
Monitoring was disabled in some locations, so could be more
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Donate NowHere are all the reported sewage overflow totals for Newport West and Islwyn in 2025. 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 2 of the total 38 CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway locations had reporting enabled for less than half the year. Of these 2 had zero reporting.
| Company | Waterway | Site | Sewage Dumps | Duration (Hours) | Reporting % |
|---|---|---|---|---|---|
| Dwr Cymru Welsh Water | River Ebbw | Tanybryn Risca CSO, Pontymister | 196 | 3,474 | 98.9 |
| Dwr Cymru Welsh Water | Ebbw River | CSO 36 CWMCARN HIGH SCHOOL CHAPEL F | 133 | 2,358 | 99.9 |
| Dwr Cymru Welsh Water | Severn Estuary | RHYMNEY VALLEY TRUNK SEWER CSO | 140 | 2,262 | 99.9 |
| Dwr Cymru Welsh Water | River Rhymney | A CSO 700M SE OF PLAS MACHEN COTAGE | 102 | 1,509 | 85.7 |
| Dwr Cymru Welsh Water | Severn Estuary | WESTERN VALLEY TRUNK SEWER CSO | 59 | 1,319 | 99.8 |
| Dwr Cymru Welsh Water | Ebbw Estuary | Maesglas SPS | 63 | 715 | 96.8 |
| Dwr Cymru Welsh Water | Ebbw River | Car Park of Old Globe CSO, St John Crescent | 85 | 691 | 94.2 |
| Dwr Cymru Welsh Water | Ebbw Fawr | Tredegar Park Golf Club CSO | 94 | 592 | 99.1 |
| Dwr Cymru Welsh Water | Ebbw River | CSO 47 ALCAN WORKS ROGERSTONE | 46 | 437 | 98 |
| Dwr Cymru Welsh Water | Rhynys Brook | 4 Tredegar Terrace CSO | 35 | 375 | 99.8 |
| Dwr Cymru Welsh Water | River Ebbw | CSO 33 REAR BRYNGWYN ROAD/HIGH ST | 51 | 272 | 99.9 |
| Dwr Cymru Welsh Water | River Ebbw | Crosskeys Waunfawr Park CSO | 26 | 227 | 97.6 |
| Dwr Cymru Welsh Water | Sirhowy River | Blackwood Cwmgelli CSO | 66 | 205 | 99.4 |
| Dwr Cymru Welsh Water | Nant Carn Brook | Pontywaun CSO, Newport | 53 | 194 | 98.4 |
| Dwr Cymru Welsh Water | River Ebbw | MALVERN TERRACE CSO | 21 | 148 | 99.7 |
| Dwr Cymru Welsh Water | Ebbw Fawr | CRUMLIN SWFFRYD CSO CAERPHILLY | 82 | 141 | 99.3 |
| Dwr Cymru Welsh Water | Sirhowy River | Blackwood Oakdale Rhiw Hill CSO | 41 | 105 | 89.2 |
| Dwr Cymru Welsh Water | River Sirhowy | CSO 42 92 Tredegar St Cross Keys | 12 | 83 | 99.9 |
| Dwr Cymru Welsh Water | Sirhowy River | CSO CWM ROAD ARGOED CAERPHILLY | 23 | 71 | 99.7 |
| Dwr Cymru Welsh Water | River Sirhowy | CSO 16 Woodfield Row Blackwood | 25 | 63 | 99.9 |
| Dwr Cymru Welsh Water | River Sirhowy | Blackwood 100 Steps CSO | 37 | 57 | 97.6 |
| Dwr Cymru Welsh Water | River Ebbw | S/O 108 Commercial St, Risca CSO | 36 | 50 | 99.7 |
| Dwr Cymru Welsh Water | Ebbw River | 15 Tregwilym Close CSO | 35 | 47 | 99.4 |
| Dwr Cymru Welsh Water | Ebbw Fawr | Rhiwderin No 6258 in Field CSO | 23 | 40 | 99.7 |
| Dwr Cymru Welsh Water | Rhynys Brook | Rifleman St CSO, Risca | 28 | 30 | 98.8 |
| Dwr Cymru Welsh Water | River Ebbw | WVTS-North Celynen Colliery CSO | 4 | 26 | 99.1 |
| Dwr Cymru Welsh Water | River Ebbw | CSO 52 TT Electronics Tregwilym Ind | 3 | 21 | 99.9 |
| Dwr Cymru Welsh Water | River Ebbw | Forge Lane near Vicarage CSO, Bassaleg | 25 | 14 | 86.8 |
| Dwr Cymru Welsh Water | Ebbw Fawr | Thornhill Gardens CSO, Rogerstone | 19 | 12 | 99.7 |
| Dwr Cymru Welsh Water | Nant Gwyddon Via Surface Water Sewer And A Culvert | High Street CSO, Abercarn | 33 | 11 | 99.8 |
| Dwr Cymru Welsh Water | Sirhowy River | Markham Colliery Gun Club CSO | 12 | 10 | 89.3 |
| Dwr Cymru Welsh Water | River Ebbw | CEDAR WOOD DRIVE CSO | 26 | 6 | 100 |
| Dwr Cymru Welsh Water | Ebbw Fawr River | 21 Gladstone St CSO, Crosskeys | 4 | 1 | 97.5 |
| Dwr Cymru Welsh Water | River Ebbw | WVTS - NEWBRIDGE CSO CAERPHILLY | 1 | 1 | 99.9 |
| Dwr Cymru Welsh Water | River Ebbw Fawr | CSO at Bassaleg Forge Lane near Nos 5 & 6 | 0 | 0 | 100 |
| Dwr Cymru Welsh Water | River Sirhowy | CSO at Hollybush - Ancient Druid | 0 | 0 | 0 |
| Dwr Cymru Welsh Water | River Ebbw | R/O Cobden St CSO, Crosskeys | 0 | 0 | 91.5 |
| Dwr Cymru Welsh Water | Sirhowy | WVTS-HOLLYBUSH SSO | 0 | 0 | 0 |
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. Live sewage data from Stream Water API
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.
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Get in touch if you have queries or want to discuss our data.
press [at] top-of-the-poops.org