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.

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Company	Site Name	Receiving Waterway	Overflow Days	Total Duration (hours)	Offline/Potential Pollution
Dwr Cymru Welsh Water	Glan-yr-Afon Lane 2 Storm Overflow	River Rhymney	36	641 h 56m	-
Dwr Cymru Welsh Water	Bedwas Road Storm Overflow	Porset Brook	42	615 h 43m	-
Dwr Cymru Welsh Water	Cwm Las Storm Overflow	River Rhymni	35	518 h 58m	-
Dwr Cymru Welsh Water	Pontllanfraith Gelligroes Mill Road Storm Overflow	Sirhowy River	37	511 h 15m	-
Dwr Cymru Welsh Water	Twyn Road Ystrad Mynach Storm Overflow	River Rhymni	30	242 h 27m	-
Dwr Cymru Welsh Water	Springfield Estate Storm Overflow	River Sirhowy	29	231 h 29m	-
Dwr Cymru Welsh Water	Gelligroes Roundabout A472 Storm Overflow	Sirhowy River	22	93 h 30m	-
Dwr Cymru Welsh Water	Ford Road Pengam Storm Overflow	River Rhymni	16	66 h 6m	-
Dwr Cymru Welsh Water	Bryn Siriol Storm Overflow	Nant Yr Aber	12	65 h 25m	-
Dwr Cymru Welsh Water	A472 Maesycwmmer Storm Overflow	River Rhymni	12	61 h 43m	-
Dwr Cymru Welsh Water	Ystrad Mynach Bridge Storm Overflow	River Rhymney	13	61 h 33m	-
Dwr Cymru Welsh Water	Pentwyngwyn Road Storm Overflow	River Rhymney	14	61 h 21m	-
Dwr Cymru Welsh Water	Oaks End Close Footbridge Storm Overflow	Nant Cylla	19	56 h 10m	-
Dwr Cymru Welsh Water	William Street Tir-y-berth Storm Overflow	River Rhymney	13	38 h 33m	-
Dwr Cymru Welsh Water	Caerphilly Bypass Supermarket Storm Overflow	Nant Yr Aber	5	37 h 24m	-
Dwr Cymru Welsh Water	River Terrace Pengham Storm Overflow	River Rhymney	8	30 h 6m	-
Dwr Cymru Welsh Water	Commercial Street Senghenydd Storm Overflow	Nant Cwm-Parc	2	24 h 48m	-
Dwr Cymru Welsh Water	Trelyn Lane Storm Overflow	River Rhymni	9	22 h 28m	-
Dwr Cymru Welsh Water	Wyllie Halt Storm Overflow	Sirhowy River	4	22 h 15m	-
Dwr Cymru Welsh Water	Pontllanfraith Tram Road Storm Overflow	Sirhowy River	7	20 h 58m	-
Dwr Cymru Welsh Water	Pant Glas Industrial Estate Storm Overflow	River Rhymney	4	11 h 2m	-
Dwr Cymru Welsh Water	South of Nine Mile Point Road Wattsville Storm Overflow	Sirhowy River	6	9 h 7m	-
Dwr Cymru Welsh Water	Windsor Place Storm Overflow	Nant Yr Aber	2	5 h 53m	-
Dwr Cymru Welsh Water	Nine Mile Point Storm Overflow	River Sirhowy	1	5 h 14m	-
Dwr Cymru Welsh Water	Main Road Maesycwmmer Overflow	Rhymney River	1	5 h 9m	-
Dwr Cymru Welsh Water	Graig-Y-Fedw Storm Overflow	Nant Yr Aber	2	2 h 13m	-
Dwr Cymru Welsh Water	Woodland Place Storm Overflow	River Rhymney	4	2 h 13m	-
Dwr Cymru Welsh Water	High Street Gant-y-nant Storm Overflow	River Rhymni	1	1 h 15m	-
Dwr Cymru Welsh Water	William Street Fleur-de-lis Storm Overflow	River Rhymney	1	0 h 29m	-
Dwr Cymru Welsh Water	Coopers Court Storm Overflow	River Rhymni	1	0 h 29m	-
Dwr Cymru Welsh Water	Nantgawr Road Storm Overflow	Nant-yr-Aber	1	0 h 15m	-
Dwr Cymru Welsh Water	Forge Road Machen Overflow	River Rhymni	1	0 h 15m	-
Dwr Cymru Welsh Water	Greenway Bedwas Storm Overflow	River Rhymni	0	0 h	-
Dwr Cymru Welsh Water	Islwyn Road Storm Overflow	Sirhowy River	0	0 h	-
Dwr Cymru Welsh Water	Church Street Rear Ystrad Mynnach Storm Overflow	Nant Caeach	0	0 h	-
Dwr Cymru Welsh Water	Glan-y-nant Riverside Path Storm Overflow	River Rhymni	0	0 h	-
Dwr Cymru Welsh Water	New Road Roundabout Storm Overflow	River Rhymni	0	0 h	-
Dwr Cymru Welsh Water	Trelyn Park Storm Overflow	River Rhymney	0	0 h	-
Dwr Cymru Welsh Water	Forge Road Storm Overflow	River Rhymni	0	0 h	-
Dwr Cymru Welsh Water	Coedcae Road Abertridwr Storm Overflow	Nant Yr Aber	0	0 h	-
Dwr Cymru Welsh Water	Victoria Road Fleur-De-Lis Storm Overflow	River Rhymni	0	0 h	-
Dwr Cymru Welsh Water	Railway Cottages Storm Overflow	Sirhowy River	0	0 h	-
Dwr Cymru Welsh Water	Church Street Ystrad Mynach Overflow	River Rhymni	0	0 h	-
Dwr Cymru Welsh Water	Riverside Park Trethomas Storm Overflow	River Rhymney	0	0 h	-
Dwr Cymru Welsh Water	Senghenydd Storm Overflow	Nant Yr Aber	0	0 h	-

It's a Dirty Business

Caerphilly - Live Sewage

Polluted by sewage 3,467 hours in 2026 so far..

Caerphilly - Live Sewage

Which Year?

Select Another Constituency

View Annual Sewage Data

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Constituencies near Caerphilly

Daily Data

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Totals so far

Data Sources & Accuracy

Media Queries

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It's a Dirty Business

Caerphilly - Live Sewage Polluted by sewage 3,467 hours in 2026 so far..

Caerphilly - Live Sewage

Which Year?

Select Another Constituency

View Annual Sewage Data

Take Action

Constituencies near Caerphilly

Daily Data

We need your support!

Totals so far

Data Sources & Accuracy

Media Queries

Please Support Us

Caerphilly - Live Sewage

Polluted by sewage 3,467 hours in 2026 so far..