Top of the Poops | Constituency Sewage Map

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You're looking at the totals that we have calculated for sewage in Caerphilly so far for 2026. It is an estimate, based on very poor quality live data from the Water Companies. The water companies report their sewage to the Environment Agency every year in April. You can see the last reported year in the other page

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 2026

Sewage7,035 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	120	1,756h 32m	-
Dwr Cymru Welsh Water	Oaks End Close Footbridge Storm Overflow	Nant Cylla	69	926h 2m	-
Dwr Cymru Welsh Water	Springfield Estate Storm Overflow	River Sirhowy	73	882h 52m	-
Dwr Cymru Welsh Water	Glan-yr-Afon Lane 2 Storm Overflow	River Rhymney	71	840h 16m	-
Dwr Cymru Welsh Water	Pontllanfraith Gelligroes Mill Road Storm Overflow	Sirhowy River	77	711h 34m	-
Dwr Cymru Welsh Water	Cwm Las Storm Overflow	River Rhymni	49	614h 4m	-
Dwr Cymru Welsh Water	Twyn Road Ystrad Mynach Storm Overflow	River Rhymni	52	332h 10m	-
Dwr Cymru Welsh Water	Gelligroes Roundabout A472 Storm Overflow	Sirhowy River	54	140h 58m	-
Dwr Cymru Welsh Water	Pentwyngwyn Road Storm Overflow	River Rhymney	21	107h 3m	-
Dwr Cymru Welsh Water	Ford Road Pengam Storm Overflow	River Rhymni	32	97h 47m	-
Dwr Cymru Welsh Water	A472 Maesycwmmer Storm Overflow	River Rhymni	19	92h 30m	-
Dwr Cymru Welsh Water	Ystrad Mynach Bridge Storm Overflow	River Rhymney	25	88h 56m	-
Dwr Cymru Welsh Water	Bryn Siriol Storm Overflow	Nant Yr Aber	20	81h 6m	-
Dwr Cymru Welsh Water	Commercial Street Senghenydd Storm Overflow	Nant Cwm-Parc	6	47h 41m	-
Dwr Cymru Welsh Water	River Terrace Pengham Storm Overflow	River Rhymney	16	46h 42m	-
Dwr Cymru Welsh Water	William Street Tir-y-berth Storm Overflow	River Rhymney	16	40h 44m	-
Dwr Cymru Welsh Water	Caerphilly Bypass Supermarket Storm Overflow	Nant Yr Aber	8	38h 45m	-
Dwr Cymru Welsh Water	Pontllanfraith Tram Road Storm Overflow	Sirhowy River	10	38h 40m	-
Dwr Cymru Welsh Water	Trelyn Lane Storm Overflow	River Rhymni	13	35h 57m	-
Dwr Cymru Welsh Water	Wyllie Halt Storm Overflow	Sirhowy River	6	25h 2m	-
Dwr Cymru Welsh Water	South of Nine Mile Point Road Wattsville Storm Overflow	Sirhowy River	10	19h 5m	-
Dwr Cymru Welsh Water	Main Road Maesycwmmer Overflow	Rhymney River	4	14h 53m	-
Dwr Cymru Welsh Water	Pant Glas Industrial Estate Storm Overflow	River Rhymney	6	11h 44m	-
Dwr Cymru Welsh Water	Senghenydd Storm Overflow	Nant Yr Aber	2	7h 30m	-
Dwr Cymru Welsh Water	Windsor Place Storm Overflow	Nant Yr Aber	3	6h 19m	-
Dwr Cymru Welsh Water	Woodland Place Storm Overflow	River Rhymney	8	6h 13m	-
Dwr Cymru Welsh Water	Graig-Y-Fedw Storm Overflow	Nant Yr Aber	6	5h 56m	-
Dwr Cymru Welsh Water	Nine Mile Point Storm Overflow	River Sirhowy	3	5h 44m	-
Dwr Cymru Welsh Water	Forge Road Storm Overflow	River Rhymni	1	3h 45m	-
Dwr Cymru Welsh Water	High Street Gant-y-nant Storm Overflow	River Rhymni	2	2h 12m	-
Dwr Cymru Welsh Water	Forge Road Machen Overflow	River Rhymni	4	1h 28m	-
Dwr Cymru Welsh Water	New Road Roundabout Storm Overflow	River Rhymni	1	1h 14m	-
Dwr Cymru Welsh Water	Coopers Court Storm Overflow	River Rhymni	2	0h 58m	-
Dwr Cymru Welsh Water	William Street Fleur-de-lis Storm Overflow	River Rhymney	2	0h 44m	-
Dwr Cymru Welsh Water	Islwyn Road Storm Overflow	Sirhowy River	2	0h 43m	-
Dwr Cymru Welsh Water	Nantgawr Road Storm Overflow	Nant-yr-Aber	2	0h 29m	-
Dwr Cymru Welsh Water	Riverside Park Trethomas Storm Overflow	River Rhymney	1	0h 29m	-
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	Railway Cottages Storm Overflow	Sirhowy River	0	0h	-
Dwr Cymru Welsh Water	Glan-y-nant Riverside Path Storm Overflow	River Rhymni	0	0h	-
Dwr Cymru Welsh Water	Trelyn Park Storm Overflow	River Rhymney	0	0h	-
Dwr Cymru Welsh Water	Greenway Bedwas Storm Overflow	River Rhymni	0	0h	-
Dwr Cymru Welsh Water	Coedcae Road Abertridwr Storm Overflow	Nant Yr Aber	0	0h	-

Caerphilly - Live Sewage

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