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You're looking at the totals that we have calculated for sewage in Caerphilly 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 Caerphilly in 2025

Sewage7,634 hours

Monitoring offline0 hours

Potential pollution0 hours

Storm overflows45

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Company	Site Name	Receiving Waterway	Overflow Days	Total Duration (hours)	Offline/Potential Pollution
Dwr Cymru Welsh Water	Bedwas Road Storm Overflow	Porset Brook	99	1,086h 40m	-
Dwr Cymru Welsh Water	Glan-yr-Afon Lane 2 Storm Overflow	River Rhymney	92	1,068h 46m	-
Dwr Cymru Welsh Water	Pontllanfraith Gelligroes Mill Road Storm Overflow	Sirhowy River	93	918h 12m	-
Dwr Cymru Welsh Water	Cwm Las Storm Overflow	River Rhymni	72	806h 7m	-
Dwr Cymru Welsh Water	Caerphilly Bypass Supermarket Storm Overflow	Nant Yr Aber	38	476h 38m	-
Dwr Cymru Welsh Water	Twyn Road Ystrad Mynach Storm Overflow	River Rhymni	59	475h 16m	-
Dwr Cymru Welsh Water	Springfield Estate Storm Overflow	River Sirhowy	61	441h 13m	-
Dwr Cymru Welsh Water	Bryn Siriol Storm Overflow	Nant Yr Aber	43	384h 42m	-
Dwr Cymru Welsh Water	A472 Maesycwmmer Storm Overflow	River Rhymni	54	288h 50m	-
Dwr Cymru Welsh Water	Oaks End Close Footbridge Storm Overflow	Nant Cylla	65	243h 53m	-
Dwr Cymru Welsh Water	River Terrace Pengham Storm Overflow	River Rhymney	35	198h 5m	-
Dwr Cymru Welsh Water	Ford Road Pengam Storm Overflow	River Rhymni	47	183h 28m	-
Dwr Cymru Welsh Water	Pentwyngwyn Road Storm Overflow	River Rhymney	40	159h 38m	-
Dwr Cymru Welsh Water	William Street Tir-y-berth Storm Overflow	River Rhymney	42	153h 6m	-
Dwr Cymru Welsh Water	South of Nine Mile Point Road Wattsville Storm Overflow	Sirhowy River	25	112h 3m	-
Dwr Cymru Welsh Water	Gelligroes Roundabout A472 Storm Overflow	Sirhowy River	61	108h 4m	-
Dwr Cymru Welsh Water	Trelyn Lane Storm Overflow	River Rhymni	27	99h 51m	-
Dwr Cymru Welsh Water	Pontllanfraith Tram Road Storm Overflow	Sirhowy River	25	90h 6m	-
Dwr Cymru Welsh Water	Ystrad Mynach Bridge Storm Overflow	River Rhymney	23	78h 18m	-
Dwr Cymru Welsh Water	Wyllie Halt Storm Overflow	Sirhowy River	18	66h 40m	-
Dwr Cymru Welsh Water	Pant Glas Industrial Estate Storm Overflow	River Rhymney	15	57h 41m	-
Dwr Cymru Welsh Water	Woodland Place Storm Overflow	River Rhymney	23	39h 28m	-
Dwr Cymru Welsh Water	High Street Gant-y-nant Storm Overflow	River Rhymni	8	18h 48m	-
Dwr Cymru Welsh Water	Nine Mile Point Storm Overflow	River Sirhowy	8	17h 8m	-
Dwr Cymru Welsh Water	Graig-Y-Fedw Storm Overflow	Nant Yr Aber	7	15h 33m	-
Dwr Cymru Welsh Water	Commercial Street Senghenydd Storm Overflow	Nant Cwm-Parc	10	8h 24m	-
Dwr Cymru Welsh Water	Windsor Place Storm Overflow	Nant Yr Aber	5	6h 28m	-
Dwr Cymru Welsh Water	Coopers Court Storm Overflow	River Rhymni	9	5h 46m	-
Dwr Cymru Welsh Water	Forge Road Machen Overflow	River Rhymni	4	4h 43m	-
Dwr Cymru Welsh Water	Forge Road Storm Overflow	River Rhymni	6	4h 22m	-
Dwr Cymru Welsh Water	Senghenydd Storm Overflow	Nant Yr Aber	3	4h	-
Dwr Cymru Welsh Water	Glan-y-nant Riverside Path Storm Overflow	River Rhymni	3	3h 36m	-
Dwr Cymru Welsh Water	Riverside Park Trethomas Storm Overflow	River Rhymney	6	2h 37m	-
Dwr Cymru Welsh Water	Islwyn Road Storm Overflow	Sirhowy River	3	1h 59m	-
Dwr Cymru Welsh Water	New Road Roundabout Storm Overflow	River Rhymni	1	0h 59m	-
Dwr Cymru Welsh Water	Nantgawr Road Storm Overflow	Nant-yr-Aber	1	0h 59m	-
Dwr Cymru Welsh Water	Trelyn Park Storm Overflow	River Rhymney	2	0h 41m	-
Dwr Cymru Welsh Water	Railway Cottages Storm Overflow	Sirhowy River	1	0h 28m	-
Dwr Cymru Welsh Water	Main Road Maesycwmmer Overflow	Rhymney River	1	0h 17m	-
Dwr Cymru Welsh Water	Coedcae Road Abertridwr Storm Overflow	Nant Yr Aber	1	0h 15m	-
Dwr Cymru Welsh Water	Victoria Road Fleur-De-Lis Storm Overflow	River Rhymni	0	0h	-
Dwr Cymru Welsh Water	Church Street Ystrad Mynach Overflow	River Rhymni	0	0h	-
Dwr Cymru Welsh Water	Church Street Rear Ystrad Mynnach Storm Overflow	Nant Caeach	0	0h	-
Dwr Cymru Welsh Water	William Street Fleur-de-lis Storm Overflow	River Rhymney	0	0h	-
Dwr Cymru Welsh Water	Greenway Bedwas Storm Overflow	River Rhymni	0	0h	-

Caerphilly - 2025 Sewage

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