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You're looking at the totals that we have calculated for sewage in Monmouthshire 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.

Totals for Monmouthshire in 2025

Sewage18,398 hours

Monitoring offline0 hours

Potential pollution0 hours

Storm overflows40

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Company	Site Name	Receiving Waterway	Overflow Days	Total Duration (hours)	Offline/Potential Pollution
Dwr Cymru Welsh Water	Pwllmeyric Storm Overflow	Mounton Brook	149	3,224h 50m	-
Dwr Cymru Welsh Water	Usk WwTW Storm Overflow	River Usk	119	2,512h	-
Dwr Cymru Welsh Water	Little Mill WwTW Overflow	Berthin Brook	77	1,460h 1m	-
Dwr Cymru Welsh Water	Castell Coch Overflow	Mill Reen	112	1,420h 59m	-
Dwr Cymru Welsh Water	Hunger Pill Overflow	River Wye Estuary	99	1,388h 23m	-
Dwr Cymru Welsh Water	Goytre WwTW Storm Overflow	River Usk	71	885h 12m	-
Dwr Cymru Welsh Water	Llangybi WwTW Storm Overflow	River Usk	126	871h 36m	-
Dwr Cymru Welsh Water	Welsh Street Storm Overflow	River Wye	100	796h 32m	-
Dwr Cymru Welsh Water	Forge Hammer Storm Overflow	River Clydach	73	762h 23m	-
Dwr Cymru Welsh Water	Pandy WwTW Inlet Overflow.	River Honddu	48	726h 15m	-
Dwr Cymru Welsh Water	Pentraeth WwTW Storm Overflow	Afon Nodwydd	56	722h 50m	-
Dwr Cymru Welsh Water	Aberbaiden WwTW Inlet Storm Overflow	River Usk	76	525h 2m	-
Dwr Cymru Welsh Water	Bryngwenin Overflow	Mynachdy Brook	25	389h 44m	-
Dwr Cymru Welsh Water	Llanfoist WwTW Storm Overflow	River Usk	54	382h 17m	-
Dwr Cymru Welsh Water	Caravan Park Clydach Storm Overflow	River Clydach	42	370h 1m	-
Dwr Cymru Welsh Water	Great Oak WwTW Storm Overflow	Tributary of Clawdd Brook	29	361h 30m	-
Dwr Cymru Welsh Water	Tintern Main Road Storm Overflow	River Wye	15	285h 40m	-
Dwr Cymru Welsh Water	Chepstow Fairfield Storm Overflow	River Wye Estuary	66	282h 7m	-
Dwr Cymru Welsh Water	Wyesham Monmouth WwTW Storm Overflow	River Wye	31	232h 41m	-
Dwr Cymru Welsh Water	Mill Street Castle Meadows Storm Overflow	River Usk	50	195h 35m	-
Dwr Cymru Welsh Water	Mathern Storm Overflow	Tributary of Mounton Brook	14	128h 14m	-
Dwr Cymru Welsh Water	Granville Street Riverbank Storm Overflow	River Wye	27	95h 28m	-
Dwr Cymru Welsh Water	Little Mill Storm Overflow	Berthin Brook	19	93h 59m	-
Dwr Cymru Welsh Water	Chepstow North Storm Overflow	River Wye Estuary	43	55h 57m	-
Dwr Cymru Welsh Water	Thornwell Road Storm Overflow	River Wye	36	55h 12m	-
Dwr Cymru Welsh Water	Mill Lane Usk Overflow	River Usk	32	46h 39m	-
Dwr Cymru Welsh Water	Glangrwyney Road Storm Overflow	River Clydach	16	34h 27m	-
Dwr Cymru Welsh Water	Tintern WwTW Overflow	River Wye	22	23h 52m	-
Dwr Cymru Welsh Water	Unknown	Unknown	3	18h 15m	-
Dwr Cymru Welsh Water	Blestium Street Monmouth Storm Overflow	River Monnow	12	12h 45m	-
Dwr Cymru Welsh Water	Raglan WwTW Storm Overflow	Nant Y Wilcae	9	10h 46m	-
Dwr Cymru Welsh Water	Raglan Way Storm Overflow	River Wye	11	9h 37m	-
Dwr Cymru Welsh Water	Bluebell Drive Overflow	River Wye	1	7h 30m	-
Dwr Cymru Welsh Water	West of Barton Bridge Storm Overflow	Tributary of Nant Wilcae	5	5h 57m	-
Dwr Cymru Welsh Water	Cwrt Bryn Derwen Storm Overflow	Olway Brook	1	2h 45m	-
Dwr Cymru Welsh Water	Magor Storm Overflow	Severn Estuary	4	1h	-
Dwr Cymru Welsh Water	Unknown	Unknown	0	0h	-
Dwr Cymru Welsh Water	North Hillcrest Road Monmouth Overflow	River Wye	0	0h	-
Dwr Cymru Welsh Water	Caldicot Storm Overflow	Severn Estuary	0	0h	-
Dwr Cymru Welsh Water	South Hillcrest Road Monmouth Overflow	River Wye	0	0h	-

Monmouthshire - 2025 Sewage

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