Top of the Poops | Place | Clydach | Polluted by Dwr Cymru Welsh Water

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Totals for Clydach in 2025

12 Sites polluted by Dwr Cymru Welsh Water

904 sewage dumps

7,158 hours duration

That's 9.94 months. On average 2.5 times a day

Change Over Time

Constituency for Clydach

Nearby Constituencies

Waterways in Clydach

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Pollution Summary 2025

Here are all the reported sewage overflow totals for Clydach 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	River Tawe	TREBANOS Wastewater Treament Works	140	2,476	97.3
Dwr Cymru Welsh Water	River Tawe	Inco CSO Clydach Swansea	114	1,083	99.2
Dwr Cymru Welsh Water	River Tawe	CSO at Craig Y Duke Trebanos SOC	101	900	99.2
Dwr Cymru Welsh Water	Upper Clydach	CSO at Dilwyn Arms Pontardawe Cross NPT	101	696	99.9
Dwr Cymru Welsh Water	River Tawe	CSO Ynystawe (Point 86 New Ma)	96	688	97.8
Dwr Cymru Welsh Water	River Tawe	Pontardawe Leis Centre CSO Swansea	83	377	98.7
Dwr Cymru Welsh Water	Upper Clydach River	JAMES STREET CSO	73	260	95.3
Dwr Cymru Welsh Water	Lower Clydach River	Canal CSO. Towpath Off Hebron Road, Clydach	69	224	99.3
Dwr Cymru Welsh Water	Lower Clydach River	Storm Overflow at Heol Eithrim	51	216	97.5
Dwr Cymru Welsh Water	River Tawe	Glais CSO	36	117	99.9
Dwr Cymru Welsh Water	River Tawe	Glais SPS	36	117	99.9
Dwr Cymru Welsh Water	River Tawe	Heol Y Nant/Sybil Street Clydach CSO	4	1	79.2
Dwr Cymru Welsh Water	River Tawe	CSO at QUARRY ROAD CLYDACH (POINT 125)	0	0	75.9

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

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.

Analysing sewage pollution by the Water Industry

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© 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

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