It's a Dirty Business

Watch Channel 4's documentary about the state of the water industry, then sign the petition to bring water back to public ownership.

Neath and Swansea East - 2025 Sewage

Polluted by sewage 20,302 hours in 2025 - That's 2.35 years

© OpenStreetMap contributors
Contains OS Data © Crown copyright & database right 2021-2024
© Top of the Poops 2021-2024

Which Year?

Select Another Constituency

Select the constituency from the drop-down
✔ means we have live data (𝑥 if not)

View Annual Sewage Data

You're looking at the totals that we have calculated for sewage in Neath and Swansea East for 2025. It is an estimate, based on very poor quality live data from the Water Companies. This may not align with the 'official' reported sewage values from the water companies, which is reported in April following then end of the year - so 2025 numbers are reported in April 2026.

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.

Take Action

Your local MP is Carolyn Harris (Labour) - Find out more about their interests, donors, and voting at They Work For You

Share this page, post a message, and tell others about the huge problem of sewage pollution across the UK
Post
Post

Constituencies near Neath and Swansea East

Daily Data

Jan - 0 hours
Feb - 1,227 hours
Mar - 310 hours
Apr - 401 hours
May - 225 hours
Jun - 903 hours
Jul - 23 hours
Aug - 359 hours
Sept - 3,609 hours
Oct - 1,224 hours
Nov - 4,550 hours
Dec - 7,462 hours
Daily data is experimental and data is not guaranteed to be accurate. Please inform us of any issue, we will fix.
Please note: We don't have rainfall data for Wales. If you know where to source it please let us know!
We need your support!

Please consider a one-off or small recurring donation. We need your help to keep this site going.

Donate Now

Totals so far

Company Site Name Receiving Waterway Overflow Days Total Duration (hours) Offline/Potential Pollution
Dwr Cymru Welsh Water Crynant WwTW Storm Overflow River Dulais 128 2,450h 43m -
Dwr Cymru Welsh Water Baglan Sea Storm Overflow Swansea Bay 127 1,683h 16m -
Dwr Cymru Welsh Water Ynys March Crynant Storm Overflow River Dulais 109 1,384h 14m -
Dwr Cymru Welsh Water Cwmgwrach WwTW Storm Overflow River Neath 100 1,175h 8m -
Dwr Cymru Welsh Water Dulais Road Seven Sisters Storm Overflow River Dulais 100 1,072h 40m -
Dwr Cymru Welsh Water Clydach Bridge Street Storm Overflow River Tawe 92 958h 54m -
Dwr Cymru Welsh Water Onllwyn Storm Overflow Afon Camnant 93 945h 59m -
Dwr Cymru Welsh Water Dynevor Junction Storm Overflow Neath Estuary 94 860h 3m -
Dwr Cymru Welsh Water Swansea Fabian Way Storm Overflow The Neath Estuary 55 856h 51m -
Dwr Cymru Welsh Water Fairfield Neath Storm Overflow Estuarial Waters of Afon Nedd 78 645h 24m -
Dwr Cymru Welsh Water Moses Row Storm Overflow Melin Court Brook 58 587h 51m -
Dwr Cymru Welsh Water Resolven WwTW Storm Overflow River Neath 62 586h 24m -
Dwr Cymru Welsh Water High Street Gellidawel Road Storm Overflow River Neath 96 447h 6m -
Dwr Cymru Welsh Water Chain Road Storm Overflow River Neath 55 431h 4m -
Dwr Cymru Welsh Water Clyne Near Twrch Brook Storm Overflow River Neath 40 399h 9m -
Dwr Cymru Welsh Water Melincryddan Neat Storm Overflow Estuarial Waters of Afon Nedd 63 353h 45m -
Dwr Cymru Welsh Water Samlet Road Storm Overflow Nant-Y-Fendrod 44 350h 54m -
Dwr Cymru Welsh Water Farmers Road Storm Overflow River Clydach 62 349h -
Dwr Cymru Welsh Water Neath Abbey Ruins Southeast Storm Overflow River Clydach 66 348h 21m -
Dwr Cymru Welsh Water Walters Road Llansamlet Storm Overflow Nant Bran 40 324h 53m -
Dwr Cymru Welsh Water Pentre Chwyth Kilvey Hill Storm Overflow River Tawe 44 315h 54m -
Dwr Cymru Welsh Water Godfrey Avenue Rear Storm Overflow River Neath 70 256h 55m -
Dwr Cymru Welsh Water Main Road Heol Ty Gwyn Storm Overflow River Clydach 70 240h 46m -
Dwr Cymru Welsh Water Hebron Road Storm Overflow Lower Afon Clydach 48 235h 16m -
Dwr Cymru Welsh Water Neath Penrhiwtyn Storm Overflow Tributary of River Clydach 39 234h 26m -
Dwr Cymru Welsh Water Old Road Skewen Storm Overflow Tennant Canal 68 226h 40m -
Dwr Cymru Welsh Water Heol Hendre Bryncoch Storm Overflow Tributary of Afon Clydach 42 202h 33m -
Dwr Cymru Welsh Water Heol Eithrym Storm Overflow Lower Afon Clydach 25 154h 19m -
Dwr Cymru Welsh Water Dulais Fach Road Storm Overflow River Neath 65 152h 57m -
Dwr Cymru Welsh Water Station Road Glais Storm Overflow River Tawe 29 123h 28m -
Dwr Cymru Welsh Water Glais Swansea Overflow River Tawe 29 123h 28m -
Dwr Cymru Welsh Water Bryndulais Avenue Seven Sisters No 2 Storm Overflow River Dulais 36 120h 12m -
Dwr Cymru Welsh Water Peniel Green Road Storm Overflow Tributary of Nant-Bran 29 117h 11m -
Dwr Cymru Welsh Water Main Road Aberdulais No2 Storm Overflow Tributary of Tennant Canal 26 112h 28m -
Dwr Cymru Welsh Water Neath Quay Road Storm Overflow Estuarial Waters of the River Neath 55 106h 26m -
Dwr Cymru Welsh Water Plas Y Coed Storm Overflow River Neath 40 104h 46m -
Dwr Cymru Welsh Water Gnoll Park Road Storm Overflow River Neath 55 103h 37m -
Dwr Cymru Welsh Water Bethel Road Glynneath Storm Overflow River Neath 27 91h 9m -
Dwr Cymru Welsh Water Pentreffynnon Storm Overflow Estuarial Waters of Afon Nedd 35 85h 39m -
Dwr Cymru Welsh Water Baldwins Crescent Overflow Coastal Waters - Swansea Bay 31 73h 21m -
Dwr Cymru Welsh Water Main Road Bryncoch Storm Overflow Tributary of River Clydach 14 63h -
Dwr Cymru Welsh Water Bonymaen Road No. 1 Storm Overflow River Tawe 32 59h 7m -
Dwr Cymru Welsh Water Aberdulais Storm Overflow Neath Estuary 21 57h 23m -
Dwr Cymru Welsh Water Bonymaen Road No. 2 Storm Overflow River Tawe 31 57h 11m -
Dwr Cymru Welsh Water Roman Way Neath Storm Overflow River Neath 21 52h 54m -
Dwr Cymru Welsh Water Lonlas Storm Overflow Crymlyn Brook 14 51h 42m -
Dwr Cymru Welsh Water Llandarcy Outfall Storm Overflow Estuarial Waters Of The River Neath 28 50h 31m -
Dwr Cymru Welsh Water Llantwit Road Neath Storm Overflow Estuarial Waters of Llantwit Stream 19 48h 27m -
Dwr Cymru Welsh Water Ynys y Mond Road Swansea Overflow River Tawe 21 44h 13m -
Dwr Cymru Welsh Water Longford Road Storm Overflow Tributary of Afon Clydach 13 39h 39m -
Dwr Cymru Welsh Water Monastery Road Storm Overflow River Clydach 12 35h 30m -
Dwr Cymru Welsh Water Swansea Bay WwTW Storm Overflow Swansea Bay 2 31h -
Dwr Cymru Welsh Water Elba Crescent Swansea Overflow Swansea Bay 8 27h 28m -
Dwr Cymru Welsh Water Cimla Road Gnoll Brook Storm Overflow Gnoll Brook 11 27h 25m -
Dwr Cymru Welsh Water Stanley Place Storage Storm Overflow Tributary of Tennant Canal 7 26h 45m -
Dwr Cymru Welsh Water Halfway Pentre-Dwr Storm Overflow Tributary of Crymlyn Bog 9 26h 27m -
Dwr Cymru Welsh Water Heol Illtyd Storm Overflow River Neath 7 25h 30m -
Dwr Cymru Welsh Water Main Road Aberdulais No.1 Storm Overflow River Dulais 8 25h 10m -
Dwr Cymru Welsh Water B4434 Roundabout Resolven Storm Overflow River Neath 21 20h 33m -
Dwr Cymru Welsh Water Neath Hillside Lane Storm Overflow Eastland Brook 19 20h 19m -
Dwr Cymru Welsh Water Heol Dulais Birchgrove Storm Overflow Nant Bran 7 18h -
Dwr Cymru Welsh Water Birchgrove Road Storm Overflow Surface Water Culvert leading to Nant Bran 10 17h 14m -
Dwr Cymru Welsh Water Drummau Road Storm Overflow Nant-Y-Fendrod 9 16h 32m -
Dwr Cymru Welsh Water Cimla Common Storm Overflow Hollins Clough Ditch 4 15h 51m -
Dwr Cymru Welsh Water Heol Tonmaen Storm Overflow River Neath 13 14h 5m -
Dwr Cymru Welsh Water Cardonnel Road Storm Overflow River Neath 1 10h 45m -
Dwr Cymru Welsh Water Bethel Road Llansamlet Storm Overflow Tributary of Nant-Bran 5 7h 55m -
Dwr Cymru Welsh Water Unknown Unknown 1 5h 15m -
Dwr Cymru Welsh Water Dulais Fach Road Junction Storm Overflow Tributary of Neath Canal 5 3h 27m -
Dwr Cymru Welsh Water Trallwn Community Centre Storm Overflow Nant Bran 6 3h 13m -
Dwr Cymru Welsh Water Fabian Way Swansea Storm Overflow Estuarial Waters of Swansea Bay 5 1h 44m -
Dwr Cymru Welsh Water Dyfed Road Neath Storm Overflow River Neath 5 1h 28m -
Dwr Cymru Welsh Water Heol-Y-Nant Sybil Street Storm Overflow River Tawe 2 0h 57m -
Dwr Cymru Welsh Water Unknown Unknown 3 0h 45m -
Dwr Cymru Welsh Water Quarr Rd Storm Overflow River Tawe 2 0h 45m -
Dwr Cymru Welsh Water Heol Las Storm Overflow Nant Y Fendrod 1 0h 15m -
Dwr Cymru Welsh Water Dwr Y Felin Road Storm Overflow Estuarial Waters of Afon Nedd 0 0h -
Dwr Cymru Welsh Water Caenant Terrace Storm Overflow Tennant Canal 0 0h -
Dwr Cymru Welsh Water Cadoxton Road Storm Overflow River Neath 0 0h -
Dwr Cymru Welsh Water Bryndulais Avenue Seven Sisters No1 Storm Overflow River Dulais 0 0h -

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. Live sewage data from Stream Water API

Annual figures up to and including 2025 come from official water company returns. The 2026 figure is our own estimate, derived continuously from the companies' live data feeds.

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.

Top of the Poops

Analysing sewage pollution by the Water Industry

Follow on Instagram

Media Queries

Get in touch if you have queries or want to discuss our data.

press [at] top-of-the-poops.org

Please Support Us

We rely on donations to fund our work. Please support us if you can
Yes! Support TOTP!

© 2020-2025 Top-Of-The-Poops CC-BY-SA 4.0,
© Openstreetmap contributors, Contains OS data © Crown copyright and database right 2021-2025,
Contains Water UK National Storm Overflow Hub Data CC-BY-SA 4.0 and analysis © 2025 Top-Of-The-Poops

Some data reproduced under Open Government Licence

Please don't scrape these pages - we can maybe share our data with you

Full Copyright information available at: our GitHub page