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Polluted by sewage 1,265 times in 2025 lasting 4,746 hours
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Donate NowHere are all the reported sewage overflow totals for Castell-nedd 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 place all the declared CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway s appeared to have monitoring enabled for more than 50% of the year
| Company | Waterway | Site | Sewage Dumps | Duration (Hours) | Reporting % |
|---|---|---|---|---|---|
| Dwr Cymru Welsh Water | Neath Estuary | Dynevor Junction SPS | 108 | 934 | 99.9 |
| Dwr Cymru Welsh Water | Estuarial Waters Of River Neath | Fairfield SPS, Neath | 109 | 538 | 99.8 |
| Dwr Cymru Welsh Water | Estuarial Waters Of River Neath | Melincryddan SPS | 76 | 418 | 99.8 |
| Dwr Cymru Welsh Water | River Clydach | Neath Abbey SPS | 88 | 384 | 96 |
| Dwr Cymru Welsh Water | River Clydach | CSO 27 Farmers Road Pumping Station | 68 | 382 | 99.9 |
| Dwr Cymru Welsh Water | River Neath Via Surface Water Sewer | Penrhiwtyn SPS | 40 | 259 | 99.9 |
| Dwr Cymru Welsh Water | Tennant Canal | OLD ROAD CSO OLD ROAD SKEWEN NEATH | 83 | 253 | 99.9 |
| Dwr Cymru Welsh Water | River Clydach | CSO NO 10 30M U/S ROADBRIDGE | 82 | 214 | 99.3 |
| Dwr Cymru Welsh Water | River Clydach | Rear No 1 Dyffryn V'W Bryn Coch CSO | 53 | 211 | 99.9 |
| Dwr Cymru Welsh Water | River Neath | CSO 48 NEATH RIVER BRIDGE ADJ CALOR | 86 | 183 | 99.9 |
| Dwr Cymru Welsh Water | Tennant Canal | CSO 49 LLANGATWG SCHOOL ABERDULIAS | 33 | 123 | 99.9 |
| Dwr Cymru Welsh Water | Esturial Water Of River Neath | Quay Road PS Town Centre Neath | 64 | 104 | 99.6 |
| Dwr Cymru Welsh Water | Estuarial Waters Of River Neath | Pentreffynnon Sewage Pumping Station at Neath Abbey Ind Estate, Neath | 50 | 93 | 99.8 |
| Dwr Cymru Welsh Water | River Neath | Gnoll Park Road CSO | 71 | 69 | 99.4 |
| Dwr Cymru Welsh Water | Neath Estuary | ABERDULAIS SPS | 26 | 68 | 99.9 |
| Dwr Cymru Welsh Water | River Clydach | CSO 8 Bryncoch 7B Bryncoch | 15 | 64 | 99.9 |
| Dwr Cymru Welsh Water | To Crymlyn Brook Via A Surface Water Culvert | Skewen SPS Park Avenue Lonlas Neath | 20 | 57 | 99.9 |
| Dwr Cymru Welsh Water | River Neath | GUNSIGHT OVERFLOW SWO 11 CSO | 24 | 49 | 99.9 |
| Dwr Cymru Welsh Water | Estuarial Waters Of Llantwit Stream | Llantwit Church SPS | 21 | 48 | 99.9 |
| Dwr Cymru Welsh Water | Tidal River Neath | Llandarcy 36" Outfall | 45 | 40 | 98.8 |
| Dwr Cymru Welsh Water | River Neath | Cadoxton Road CSO Cadoxton Road | 3 | 39 | 99.9 |
| Dwr Cymru Welsh Water | River Clydach | Longford Road Neath Abbey CSO | 14 | 32 | 99.8 |
| Dwr Cymru Welsh Water | Gnoll Brook | CSO 33 CIMLA ROAD CIMLA NEATH | 12 | 31 | 98.9 |
| Dwr Cymru Welsh Water | River Dulais | CSO Outside Visitor Centre, Aberdulais | 7 | 30 | 99.9 |
| Dwr Cymru Welsh Water | Tennant Canal | Church Road CSO Church Road Neath | 7 | 26 | 99.9 |
| Dwr Cymru Welsh Water | River Neath | HEOL ILLTYD CSO BRYNCOCH NPT | 9 | 26 | 99.9 |
| Dwr Cymru Welsh Water | River Clydach | Monastery Road Cso (Cso 35) Neath | 14 | 20 | 86.8 |
| Dwr Cymru Welsh Water | Hollins Clough Ditch | CSO 9 CIMLA COMMON CIMLA NEATH | 6 | 17 | 99.9 |
| Dwr Cymru Welsh Water | Eastland Brook | St Joseph's Church CSO | 15 | 17 | 99.9 |
| Dwr Cymru Welsh Water | Neath Canal | Park Street CSO Park Street Tonna | 10 | 4 | 99.9 |
| Dwr Cymru Welsh Water | Neath - Conf With Nedd Fechan And Mellte To Tl | Adj Health Centre CSO, Dyfed Rd | 5 | 1 | 96.6 |
| Dwr Cymru Welsh Water | Tennant Cannal | CSO at R/O 38 Caenant Terrace, Neath | 1 | 0 | 100 |
| Dwr Cymru Welsh Water | Unnamed Stream To Tennant Canal | New Road Nursing Home CSO, Skewen | 0 | 0 | 100 |
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.
This project is not associated, approved or endorsed by any of the companies whose logos you see here.
Get in touch if you have queries or want to discuss our data.
press [at] top-of-the-poops.org