Clwyd South was polluted by sewage 2,037 times in 2023
lasting 9,933 hours - that's 1.15 years!
- but monitoring was disabled in some locations, so could be more

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Constituency

✔ means we have experimental daily data since 2023

Totals for Clwyd South in 2023

55 Sites polluted by Dwr Cymru Welsh Water

2,037 sewage dumps
9,933 h duration

That's 1.15 years! On average 5.6 times a day

Change Over Time

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Constituencies near Clwyd South

Waterways in Clwyd South

Pollution Summary 2023

Here are all the reported sewage overflow totals for Clwyd South 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 1 of the total 61 CSO locations had reporting enabled for less than half the year, of which 1 had zero reporting.

Company	Waterway	Site	Sewage Dumps	Duration (Hours)	Reporting %
Dwr Cymru Welsh Water	River Dee	Settled Storm Overflow at Bangor-on-Dee Wastewater Treatment Works	72	859	100
Dwr Cymru Welsh Water	River Dee	LLANGOLLEN WWTW	73	816	99.7
Dwr Cymru Welsh Water	Tref Y Nant Brook	CEFN PS	86	640	99.9
Dwr Cymru Welsh Water	River Goch	Pant CSO	100	574	100
Dwr Cymru Welsh Water	River Dee	CSO at Cynwyd STW	124	570	100
Dwr Cymru Welsh Water	Unnamed Stream	CSO At Corwen Rear Of The Pavillion	128	544	93.8
Dwr Cymru Welsh Water	River Clywedog	Gwynfryn CSO	73	494	99.9
Dwr Cymru Welsh Water	River Gwenfro	Talwrn Road No 2 CSO	120	458	99.6
Dwr Cymru Welsh Water	River Gwenfro	Southsea Rollers Arms - CSO	90	452	100
Dwr Cymru Welsh Water	River Dee	CEFN MAWR WwTW	39	444	99.8
Dwr Cymru Welsh Water	Dee	HAND HOTEL GARDENS CSO	93	408	100
Dwr Cymru Welsh Water	River Dee	BANGOR ON DEE STW	24	338	99.9
Dwr Cymru Welsh Water	River Dee	FIVE FORDS STW	35	327	100
Dwr Cymru Welsh Water	Clywedog	Coedpoeth Nant PS	51	274	100
Dwr Cymru Welsh Water	River Dee	Corwen WwTW Settled Storm	29	259	100
Dwr Cymru Welsh Water	River Dee	Park Avenue CSO	25	214	100
Dwr Cymru Welsh Water	River Goch	Afon Eitha CSO	75	178	99
Dwr Cymru Welsh Water	River Eitha	Penycae SPS	43	155	99.9
Dwr Cymru Welsh Water	River Clywedog	Ruthin/Berse Road Coedpoeth CSO	39	143	100
Dwr Cymru Welsh Water	River Dee	CORWEN WWTW FINAL EFFLUENT	9	136	100
Dwr Cymru Welsh Water	River Dee	Abbey Road CSO	51	134	100
Dwr Cymru Welsh Water	Glanyrafon Brook	Rhostyllen Bersham Colliery CSO	63	133	99.5
Dwr Cymru Welsh Water	Tref Y Nant Brook	Cefn Monsanto CSO	63	122	99.3
Dwr Cymru Welsh Water	River Dee	Corwen Corner Station Yard CSO	19	120	63
Dwr Cymru Welsh Water	Clywedog	FIVE FORDS STW - SETTLED STORM	18	115	99.9
Dwr Cymru Welsh Water	River Gwenfro	Settled Storm Overflow at Heol Y Fro	36	113	100
Dwr Cymru Welsh Water	Nant Brook	Brymbo SPS CSO	29	105	99.9
Dwr Cymru Welsh Water	River Ceiriog	CSO at Dolywern & Llwynmawr STW	22	86	49.9
Dwr Cymru Welsh Water	Eitha	Ruabon PS	27	77	98.3
Dwr Cymru Welsh Water	River Cylflymen	CSO at THE REAR OF THE TANNERY	48	66	100
Dwr Cymru Welsh Water	Black Spool	Johnstown Combined Sewerage System CSO	28	66	99.8
Dwr Cymru Welsh Water	River Bradley	CHIRK PS (SCREENED STROM)	27	66	99.7
Dwr Cymru Welsh Water	Emral Brook	Penley Hospital SPS	22	60	100
Dwr Cymru Welsh Water	River Dee	Chirk O/S 24 Offa St CSO	13	55	99.9
Dwr Cymru Welsh Water	Unnamed Watercourse	Fford Offa CSO	34	55	98.1
Dwr Cymru Welsh Water	Tref Y Nant Brook	Trefor Isaf - CSO	28	48	99.9
Dwr Cymru Welsh Water	River Ceiriog	DOL Y WERN - CSO	25	47	99.8
Dwr Cymru Welsh Water	River Dee	Rhosymedre Park Rd CSO	15	40	99.6
Dwr Cymru Welsh Water	Glanyrafon Brook	CSO at COLLIERY ROAD RHOSTYLLEN	25	32	100
Dwr Cymru Welsh Water	River Ceidiog	Llandrillo STW PS CSO	29	22	100
Dwr Cymru Welsh Water	River Ceiriog	Glynceiriog Y Gammer - CSO	23	17	74
Dwr Cymru Welsh Water	Eitha	Ruabon Paddock Row CSO	6	14	100
Dwr Cymru Welsh Water	River Dee	Eyton Grove SPS	6	12	100
Dwr Cymru Welsh Water	River Goch	Bersham Colliery CSO	7	8	100
Dwr Cymru Welsh Water	Gwenfro	Ruthin Rd CSO, Gegin	12	6	99.9
Dwr Cymru Welsh Water	River Dee Via Surface Water Sewer	BERWYN STREET CSO	8	6	100
Dwr Cymru Welsh Water	River Dee	WEST STREET CSO	9	2	100
Dwr Cymru Welsh Water	River Dee	CSO at Rear Hamden Way Plas Madoc	4	2	99.8
Dwr Cymru Welsh Water	River Dee	Royal Hotel CSO	3	1	100
Dwr Cymru Welsh Water	River Eitha	Penycae West End School Field Land CSO	2	0	97.3
Dwr Cymru Welsh Water	River Dee	Newbridge SPS	2	0	100
Dwr Cymru Welsh Water	Unnamed Flowing To Bradley Brook	Chirk Chapel Lane CSO	1	0	95.3
Dwr Cymru Welsh Water	River Dee	Llangollen Chruch St CSO	2	0	59.6
Dwr Cymru Welsh Water	River Gwenfro	New Broughton CSO	1	0	53.7
Dwr Cymru Welsh Water	River Goch	CSO at Ruabon Combined Sewerage System	1	0	99.8
Dwr Cymru Welsh Water	River Bradley	CHIRK PS (SCREENED STORM)	0	0	99.7
Dwr Cymru Welsh Water	River Dee	Llangollen Riverside Park Printing Works CSO	0	0	90.7
Dwr Cymru Welsh Water	Black Brook	Aberderfyn CSO, Rhosllanerchrugog	0	0	0
Dwr Cymru Welsh Water	River Dee	Llangollen Victoria Prom Riverside CSO	0	0	100
Dwr Cymru Welsh Water	River Dee	Llangollen East St CSO	0	0	41.7
Dwr Cymru Welsh Water	Dee Via Surface Water Sewer And Culvert	Corwen Clawdd Poncen PS	0	0	100

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.

Analysing sewage pollution by the Water Industry

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