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You're looking at the totals that we have calculated for sewage in Llanelli 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	Pembrey WwTW Storm Overflow	Unnamed Tributary of The Loughor Estuary	74	1,576h 44m	-
Dwr Cymru Welsh Water	Llannon WwTW Storm Overflow	Afon Morlais	89	1,561h	-
Dwr Cymru Welsh Water	Pontyberem WwTW Storm Overflow	Gwendraeth Fawr	81	1,284h	-
Dwr Cymru Welsh Water	Crosshands WwTW Storm Overflow	River Gwili	64	862h 57m	-
Dwr Cymru Welsh Water	Llansaint WwTW Storm Overflow	Llansaint Stream	48	801h 30m	-
Dwr Cymru Welsh Water	Trimsaran WwTW Storm Overflow	Gwendraeth Fawr	63	750h 45m	-
Dwr Cymru Welsh Water	Mynydd Cerrig Storm Overflow	River Dulais	40	533h 7m	-
Dwr Cymru Welsh Water	Cwmtawel WwTW Storm Overflow	River Gwili	44	516h 44m	-
Dwr Cymru Welsh Water	Carway WwTW Storm Overflow	Tributary of Gwendraeth Fawr	55	338h 15m	-
Dwr Cymru Welsh Water	Croes Y Ceiliog Overflow	Nant Cwm-Croesyceiliog	31	282h 3m	-
Dwr Cymru Welsh Water	Penybanc Storm Overflow	River Loughor	35	185h 41m	-
Dwr Cymru Welsh Water	Parc y Dai No1 Drefach Storm Overflow	Gwendraeth Fawr	36	160h 56m	-
Dwr Cymru Welsh Water	Pontyates Heol Y Meinciau Storm Overflow	Gwendraeth Fawr	20	151h 54m	-
Dwr Cymru Welsh Water	Llanedi WwTW Storm Overflow	River Gwili	31	140h 30m	-
Dwr Cymru Welsh Water	Pembrey Danlan Park Storm Overflow	Unnamed Drain leading to Afon Llwchwr	24	131h 49m	-
Dwr Cymru Welsh Water	Pantyffynnon Mill Terrace Storm Overflow	River Loughor	16	111h 7m	-
Dwr Cymru Welsh Water	Trimsaran WwTW Inlet Storm Overflow	Gwendraeth Fawr	32	95h 30m	-
Dwr Cymru Welsh Water	Llanelli Coastal WwTW Storm Overflow	Loughor Estuary	14	95h	-
Dwr Cymru Welsh Water	Pembrey Links Storm Overflow	Swan Pool Drain	8	80h 15m	-
Dwr Cymru Welsh Water	Clos Isaf Storm Overflow	Gwendraeth Fawr	26	70h 19m	-
Dwr Cymru Welsh Water	Heol Plas Isaf Storm Overflow	Nant Mwrwg	22	70h	-
Dwr Cymru Welsh Water	Ferryside Storm Overflow	Ferryside Stream	16	63h	-
Dwr Cymru Welsh Water	Pontyberem Storm Overflow	Gwendraeth Fawr	21	60h 30m	-
Dwr Cymru Welsh Water	Llanelli St Michaels Storm Overflow	River Dafen	6	52h 44m	-
Dwr Cymru Welsh Water	Carmarthen Road Cefneithin Storm Overflow	Gwendraeth Fawr	15	51h 13m	-
Dwr Cymru Welsh Water	Kingfisher Court East Storm Overflow	River Dafen	5	49h 15m	-
Dwr Cymru Welsh Water	Tycoch Storm Overflow	Tributary of Gwendraeth Fawr	18	48h	-
Dwr Cymru Welsh Water	Heol Y Bryn Storm Overflow	Gwendraeth Fawr	10	45h 28m	-
Dwr Cymru Welsh Water	Cefneithin Road Gorslas Storm Overflow	Gwendraeth Fawr	11	35h 15m	-
Dwr Cymru Welsh Water	Next to Heol Y Meinciau Bridge Pontyates Storm Overflow	Gwendraeth Fawr	8	32h 15m	-
Dwr Cymru Welsh Water	Burry Port Ashburnham Road Storm Overflow	Disused Canal	2	24h 48m	-
Dwr Cymru Welsh Water	Llanelli Sandy Road Storm Overflow	River Dulais	15	24h 45m	-
Dwr Cymru Welsh Water	Kidwelly Garreg Storm Overflow	Gwendraeth Fach	6	24h 45m	-
Dwr Cymru Welsh Water	Parc y Dai No 2 Drefach Storm Overflow	Gwendraeth Fawr	13	24h 41m	-
Dwr Cymru Welsh Water	Dafen Industrial Estate Storm Overflow	River Dafen	2	18h 30m	-
Dwr Cymru Welsh Water	Llangennech Storm Overflow	River Loughor	14	16h 45m	-
Dwr Cymru Welsh Water	Pwll Storm Overflow	River Dulais	2	15h	-
Dwr Cymru Welsh Water	Maerdy Bridge Storm Overflow	Gwendraeth Fawr	12	12h 30m	-
Dwr Cymru Welsh Water	Ponthenri Storm Overflow	Gwendraeth Fawr	5	11h	-
Dwr Cymru Welsh Water	Hendy Arlan Gwili Storm Overflow	River Gwili	5	9h 41m	-
Dwr Cymru Welsh Water	Llanelli Northumberland Tanks Storm Overflow	Loughor Estuary	6	9h 30m	-
Dwr Cymru Welsh Water	Llanelli Tir Einon Storm Overflow	River Dafen	4	8h 14m	-
Dwr Cymru Welsh Water	Heol Ddu Storm Overflow	Nant Dyfaty	3	7h 43m	-
Dwr Cymru Welsh Water	Llanelli Bynea Storm Overflow	Tidal Pill of Loughor Estuary	3	7h 30m	-
Dwr Cymru Welsh Water	Iscoed Road Storm Overflow	River Loughor	7	7h 15m	-
Dwr Cymru Welsh Water	Cwm Mawr Heol Cwmbach Storm Overflow	Gwendraeth Fawr	3	7h	-
Dwr Cymru Welsh Water	Burry Port Storm Overflow	Unnamed Tributary of Barnaby Pill	4	5h 15m	-
Dwr Cymru Welsh Water	Station Road Kidwelly Overflow	Gwendraeth Fach	7	5h 12m	-
Dwr Cymru Welsh Water	Station Road Kidwelly Storm Overflow	Gwendraeth Fach	7	5h 12m	-
Dwr Cymru Welsh Water	Llanelli Station Road Junction Storm Overflow	River Lliedi	3	2h 39m	-
Dwr Cymru Welsh Water	Llanelli Cambrian Storm Overflow	Loughor Outer	5	2h	-
Dwr Cymru Welsh Water	Y Gaer Llanelli Overflow	Dafen	5	1h 15m	-
Dwr Cymru Welsh Water	Rhosnewydd Tumble Storm Overflow	Tributary of Gwendraeth Fawr	3	1h 12m	-
Dwr Cymru Welsh Water	Llanelli Pwll Park Storm Overflow	Unnamed Tributary of Barnaby Pil	2	0h 58m	-
Dwr Cymru Welsh Water	Ashburnham Storm Overflow	Burry Port Harbour	1	0h 29m	-
Dwr Cymru Welsh Water	Llanelli Havard Road Storm Overflow	River Dafen	1	0h 24m	-
Dwr Cymru Welsh Water	Llanelli Penyfan Playing Field Storm Overflow	River Lliedi	1	0h 15m	-
Dwr Cymru Welsh Water	Church Road Burry Port Storm Overflow	Nant Dyfatty	1	0h 15m	-
Dwr Cymru Welsh Water	Pontyberem WwTW Inlet Storm Overflow	Gwendraeth Fawr	1	0h 15m	-
Dwr Cymru Welsh Water	Unknown	Unknown	0	0h	-
Dwr Cymru Welsh Water	Unknown	Unknown	0	0h	-
Dwr Cymru Welsh Water	Llanelli Y Llwyn Storm Overflow	River Dafen	0	0h	-
Dwr Cymru Welsh Water	Thomas Street Storm Overflowi	River Lliedi	0	0h	-
Dwr Cymru Welsh Water	Upper Cross Road Llanelli Storm Overflow	River Dafen	0	0h	-
Dwr Cymru Welsh Water	Pontardulais Road Llangennech Storm Overflow	Afon Morlais	0	0h	-
Dwr Cymru Welsh Water	Bryn Avenue Burry Port Storm Overflow	Tributary of Barnaby Pill	0	0h	-
Dwr Cymru Welsh Water	Dyfatty Park Overflow	Drain leading to the River Loughor	0	0h	-
Dwr Cymru Welsh Water	Llangyndeyrn Storm Overflow	Unnamed Tributary of Gwendraeth Fach	0	0h	-
Dwr Cymru Welsh Water	Maestir Llanelli Storm Overflow	River Lliedi	0	0h	-
Dwr Cymru Welsh Water	Llwynuhilwg PS Overflow	Tributary of the River Dafen	0	0h	-
Dwr Cymru Welsh Water	Trimsaran Heol Llanelli Storm Overflow	Afon Morlais	0	0h	-
Dwr Cymru Welsh Water	Y Llwyn Llanelli Storm Overflow	River Dafen	0	0h	-
Dwr Cymru Welsh Water	Hendy Storm Overflow	River Gwili	0	0h	-
Dwr Cymru Welsh Water	Bryngwili Road Green Storm Overflow	River Gwili	0	0h	-
Dwr Cymru Welsh Water	Basset Terrace Storm Overflow	River Dulais	0	0h	-
Dwr Cymru Welsh Water	Llanelli Swanfield Place Storm Overflow	River Lliedi	0	0h	-
Dwr Cymru Welsh Water	Unknown	Unknown	0	0h	-
Dwr Cymru Welsh Water	Lower Trostre Road Llanelli Overflow	River Dafen	0	0h	-
Dwr Cymru Welsh Water	Cwm Capel Overflow	Nant Dyfatty	0	0h	-
Dwr Cymru Welsh Water	Llangyndeyrn WwTW Storm Overflow	Gwendraeth Fach	0	0h	-
Dwr Cymru Welsh Water	Andrew Street Bridge Storm Overflow	River Lliedi	0	0h	-
Dwr Cymru Welsh Water	Waungoch Storm Overflow	Unnamed Tributary of the Nant Glas	0	0h	-
Dwr Cymru Welsh Water	Cefneithin Road Ddol Las Storm Overflow	Gwendraeth Fawr	0	0h	-
Dwr Cymru Welsh Water	Heol Goffa Bridge Storm Overflow	River Lliedi	0	0h	-
Dwr Cymru Welsh Water	Burry Port Shoreline Overflow	Unnamed Stream Flowing to Outer Harbour	0	0h	-
Dwr Cymru Welsh Water	Unknown	Unknown	0	0h	-
Dwr Cymru Welsh Water	Ferryside Near Railway Track WwTW Storm Overflow	Ferryside Stream	0	0h	-
Dwr Cymru Welsh Water	Llangennech Recreation Ground Storm Overflow	River Loughor	0	0h	-
Dwr Cymru Welsh Water	Llanelli Halfway Storm Overflow	River Dafen	0	0h	-
Dwr Cymru Welsh Water	Heol Hen Storm Overflow	Unnamed Tributary of the River Loughor	0	0h	-
Dwr Cymru Welsh Water	Unknown	Unknown	0	0h	-
Dwr Cymru Welsh Water	Heol Nazareth Pontyates Storm Overflow	Gwendraeth Fawr	0	0h	-
Dwr Cymru Welsh Water	Trostre Industrial Park Storm Overflow	River Dafen	0	0h	-

It's a Dirty Business

Llanelli - Live Sewage

Polluted by sewage 10,492 hours in 2026 - That's 1.21 years so far..

Llanelli - Live Sewage

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It's a Dirty Business

Llanelli - Live Sewage Polluted by sewage 10,492 hours in 2026 - That's 1.21 years so far..

Llanelli - Live Sewage

Which Year?

Select Another Constituency

View Annual Sewage Data

Take Action

Constituencies near Llanelli

Daily Data

We need your support!

Totals so far

Data Sources & Accuracy

Media Queries

Please Support Us

Llanelli - Live Sewage

Polluted by sewage 10,492 hours in 2026 - That's 1.21 years so far..