Montgomeryshire and Glyndwr was polluted by sewage 1,785 times in 2023
lasting 18,500 hours - that's 2.14 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 Montgomeryshire and Glyndwr in 2023

35 Sites polluted by Dwr Cymru Welsh Water

1,785 sewage dumps
18,500 h duration

That's 2.14 years! On average 4.9 times a day

Change Over Time

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Constituencies near Montgomeryshire and Glyndwr

Waterways in Montgomeryshire and Glyndwr

Pollution Summary 2023

Here are all the reported sewage overflow totals for Montgomeryshire and Glyndwr 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 37 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 Laen	CSO at Llanbrynmair STW Llanbrynmair	291	5,811	100
Dwr Cymru Welsh Water	River Twymyn	Commins Coch Pumping Station CSO	195	4,422	99.9
Dwr Cymru Welsh Water	River Wye	Llangurig P.S. - Overflow	151	2,738	100
Dwr Cymru Welsh Water	River Twymyn	LLAN LLANBRYNMAIR PS CSO	59	827	99.9
Dwr Cymru Welsh Water	River Dyfi	MACHYNLLETH WWTW (STORM OUTFALL)	96	742	100
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	Garsiwn Ditch	MACHYNLLETH STW CSO	73	486	100
Dwr Cymru Welsh Water	River Aber Glesyrch	Ceinws SPS	39	466	99.9
Dwr Cymru Welsh Water	River Dee	CEFN MAWR WwTW	39	444	99.8
Dwr Cymru Welsh Water	River Goch	Afon Eitha CSO	75	178	99
Dwr Cymru Welsh Water	Garsiwn River Dovey	Machynlleth - Doll Street CSO	93	158	98.3
Dwr Cymru Welsh Water	River Eitha	Penycae SPS	43	155	99.9
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 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	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	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	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	Un-Named Watercourse	Machynlleth - Popular Road CSO	38	17	98.8
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	Garsiwn Ditch	Heol Penrallt CSO	17	8	100
Dwr Cymru Welsh Water	River Goch	Bersham Colliery CSO	7	8	100
Dwr Cymru Welsh Water	River Dee	CSO at Rear Hamden Way Plas Madoc	4	2	99.8
Dwr Cymru Welsh Water	River Eitha	Penycae West End School Field Land CSO	2	0	97.3
Dwr Cymru Welsh Water	Unnamed Flowing To Bradley Brook	Chirk Chapel Lane CSO	1	0	95.3
Dwr Cymru Welsh Water	Garsiwn Ditch	MACHYNLLETH STW	2	0	93.1
Dwr Cymru Welsh Water	River Dee	Newbridge SPS	2	0	100
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	Black Brook	Aberderfyn CSO, Rhosllanerchrugog	0	0	0

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

With generous support from:

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