Top of the Poops | Constituency Sewage Map | Monmouthshire

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Live data for Monmouthshire in 2026

So far this year (as of 25 Oct 2026, 17:45) there has been 22,135 hours of sewage overflows, from 40 CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway s - that's 2.56 years!

Totals for Monmouthshire in 2025

30 Sites polluted by Dwr Cymru Welsh Water

1,854 sewage dumps

17,322 hours duration

Sewage pollution map of Monmouthshire: 1,854 spills in 2025, lasting 17,322 hours, by Dwr Cymru Welsh Water

That's 2 years. On average 5.1 times a day

Change Over Time

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Company	Waterway	Site	Sewage Dumps	Duration (Hours)	Reporting %
Dwr Cymru Welsh Water	Mounton Brook	Pwllmeyric SPS (CSO)	193	3,932	94.7
Dwr Cymru Welsh Water	River Usk	USK STW GRAIG OLWAY FARM LLANGVIEW	87	1,453	99.9
Dwr Cymru Welsh Water	River Wye Estuary	Chepstow South SPS Hunger Pill STW	110	1,439	99.9
Dwr Cymru Welsh Water	River Usk	LLANGYBI STW LLANGYBI USK	234	1,345	99.9
Dwr Cymru Welsh Water	Usk River	GOYTRE SEWAGE TREATMENT WORKS NANT	93	1,275	99.9
Dwr Cymru Welsh Water	River Honddu	PANDY STW PANDY MONMOUTHSHIRE	92	1,073	99.9
Dwr Cymru Welsh Water	River Wye	CSO at Welsh Street Chepstow	130	1,054	99.9
Dwr Cymru Welsh Water	River Clydach	Maesygwartha SPS and CSO	92	1,031	99.8
Dwr Cymru Welsh Water	Clawdd Brook	CSO at Great Oak STW	44	580	99.9
Dwr Cymru Welsh Water	River Usk	ABERBAIDEN STW BEHIND HOP YARD FARM	113	578	99.9
Dwr Cymru Welsh Water	Clydach River	CLYDACH CSO	61	545	99.8
Dwr Cymru Welsh Water	River Usk	LLANFOIST WASTEWATER TREATMENT WORKS ME	65	502	99.9
Dwr Cymru Welsh Water	Mynachdy Brook	Bryn Y Gwenin SPS Abergavenny	35	467	99.9
Dwr Cymru Welsh Water	River Wye	MONMOUTH STW REDBROOK ROAD MONMOUTH	43	435	99.8
Dwr Cymru Welsh Water	River Wye Estuary	Chepstow North Fairfield SPS	75	332	99.9
Dwr Cymru Welsh Water	River Wye	Tintern Main SPS	20	326	99.9
Dwr Cymru Welsh Water	River Usk	Mill Street Screens CSO Abergaven	69	263	99.6
Dwr Cymru Welsh Water	Mounton Brook	Mathern SPS	17	142	99.9
Dwr Cymru Welsh Water	River Wye	Monmouth 2 CSO	38	140	100
Dwr Cymru Welsh Water	Berthin Brook	Little Mill CSO, Panty Pwdin	32	131	95.8
Dwr Cymru Welsh Water	River Wye Estuary	Chepstow North SPS The Back	59	72	99.9
Dwr Cymru Welsh Water	River Wye	Thornwell Road CSO	49	63	99.9
Dwr Cymru Welsh Water	River Monnow	CSO at Monmouth Town Pumping Station	23	38	99.8
Dwr Cymru Welsh Water	River Clydach	Glangrwyney Rd CSO, Gilwern	28	31	99.5
Dwr Cymru Welsh Water	Nant Y Wilcae	RAGLAN STW CHEPSTOW ROAD RAGLAN	24	30	99.9
Dwr Cymru Welsh Water	Nant Wilcae	Raglan CSO No. 1	7	16	98.6
Dwr Cymru Welsh Water	Rivr Wye	WARREN SLADE SEWAGE PUMPING STATION	1	7	99.9
Dwr Cymru Welsh Water	River Wye	Raglan Way CSO	12	7	99.9
Dwr Cymru Welsh Water	Olway Brook	RAILWAY COTTAGE CSO	1	3	99.9
Dwr Cymru Welsh Water	River Severn Estuary	Magor SPS Magor STW Site Newport	7	2	99.9
Dwr Cymru Welsh Water	River Severn Estuary	Caldicot SPS at Caldicot STW	0	0	99.9

Monmouthshire

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Live data for Monmouthshire in 2026

Totals for Monmouthshire in 2025

30 Sites polluted by Dwr Cymru Welsh Water

Change Over Time

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