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

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Company	Site Name	Receiving Waterway	Overflow Days	Total Duration (hours)	Offline/Potential Pollution
Dwr Cymru Welsh Water	Llannon WwTW Storm Overflow	Afon Morlais	129	2,521h 46m	-
Dwr Cymru Welsh Water	Pontyberem WwTW Storm Overflow	Gwendraeth Fawr	119	2,171h 48m	-
Dwr Cymru Welsh Water	Pembrey WwTW Storm Overflow	Unnamed Tributary of The Loughor Estuary	106	1,945h 1m	-
Dwr Cymru Welsh Water	Trimsaran WwTW Storm Overflow	Gwendraeth Fawr	107	1,891h 34m	-
Dwr Cymru Welsh Water	Carway WwTW Storm Overflow	Tributary of Gwendraeth Fawr	119	1,377h 6m	-
Dwr Cymru Welsh Water	Crosshands WwTW Storm Overflow	River Gwili	76	1,353h 18m	-
Dwr Cymru Welsh Water	Cwmtawel WwTW Storm Overflow	River Gwili	88	1,050h 50m	-
Dwr Cymru Welsh Water	Mynydd Cerrig Storm Overflow	River Dulais	82	984h 12m	-
Dwr Cymru Welsh Water	Croes Y Ceiliog Overflow	Nant Cwm-Croesyceiliog	60	836h 36m	-
Dwr Cymru Welsh Water	Llansaint WwTW Storm Overflow	Llansaint Stream	34	620h	-
Dwr Cymru Welsh Water	Llanedi WwTW Storm Overflow	River Gwili	89	606h 34m	-
Dwr Cymru Welsh Water	Carmarthen Road Cefneithin Storm Overflow	Gwendraeth Fawr	66	534h 30m	-
Dwr Cymru Welsh Water	Llanelli Pwll Park Storm Overflow	Unnamed Tributary of Barnaby Pil	34	520h 43m	-
Dwr Cymru Welsh Water	Trimsaran WwTW Inlet Storm Overflow	Gwendraeth Fawr	104	501h 16m	-
Dwr Cymru Welsh Water	Pontyates Heol Y Meinciau Storm Overflow	Gwendraeth Fawr	58	454h 15m	-
Dwr Cymru Welsh Water	Pwll Storm Overflow	River Dulais	25	425h 2m	-
Dwr Cymru Welsh Water	Penybanc Storm Overflow	River Loughor	71	408h 43m	-
Dwr Cymru Welsh Water	Pantyffynnon Mill Terrace Storm Overflow	River Loughor	59	391h 14m	-
Dwr Cymru Welsh Water	Ferryside Storm Overflow	Ferryside Stream	47	383h 44m	-
Dwr Cymru Welsh Water	Parc y Dai No1 Drefach Storm Overflow	Gwendraeth Fawr	70	363h 43m	-
Dwr Cymru Welsh Water	Llanelli Coastal WwTW Storm Overflow	Loughor Estuary	43	342h 11m	-
Dwr Cymru Welsh Water	Pembrey Danlan Park Storm Overflow	Unnamed Drain leading to Afon Llwchwr	54	339h 27m	-
Dwr Cymru Welsh Water	Clos Isaf Storm Overflow	Gwendraeth Fawr	67	326h 29m	-
Dwr Cymru Welsh Water	Llanelli St Michaels Storm Overflow	River Dafen	28	307h 34m	-
Dwr Cymru Welsh Water	Heol Plas Isaf Storm Overflow	Nant Mwrwg	60	297h 58m	-
Dwr Cymru Welsh Water	Kingfisher Court East Storm Overflow	River Dafen	34	290h 59m	-
Dwr Cymru Welsh Water	Heol Y Bryn Storm Overflow	Gwendraeth Fawr	43	276h 18m	-
Dwr Cymru Welsh Water	Maerdy Bridge Storm Overflow	Gwendraeth Fawr	42	241h 15m	-
Dwr Cymru Welsh Water	Cwm Mawr Heol Cwmbach Storm Overflow	Gwendraeth Fawr	33	233h 40m	-
Dwr Cymru Welsh Water	Cwm Capel Overflow	Nant Dyfatty	15	225h 15m	-
Dwr Cymru Welsh Water	Kidwelly Garreg Storm Overflow	Gwendraeth Fach	25	217h 36m	-
Dwr Cymru Welsh Water	Tycoch Storm Overflow	Tributary of Gwendraeth Fawr	43	210h 44m	-
Dwr Cymru Welsh Water	Cefneithin Road Gorslas Storm Overflow	Gwendraeth Fawr	47	203h 17m	-
Dwr Cymru Welsh Water	Pontyberem Storm Overflow	Gwendraeth Fawr	55	177h 36m	-
Dwr Cymru Welsh Water	Dafen Industrial Estate Storm Overflow	River Dafen	15	154h 30m	-
Dwr Cymru Welsh Water	Next to Heol Y Meinciau Bridge Pontyates Storm Overflow	Gwendraeth Fawr	22	153h 44m	-
Dwr Cymru Welsh Water	Parc y Dai No 2 Drefach Storm Overflow	Gwendraeth Fawr	40	144h 37m	-
Dwr Cymru Welsh Water	Pembrey Links Storm Overflow	Swan Pool Drain	30	142h 3m	-
Dwr Cymru Welsh Water	Llanelli Sandy Road Storm Overflow	River Dulais	41	133h 37m	-
Dwr Cymru Welsh Water	Burry Port Storm Overflow	Unnamed Tributary of Barnaby Pill	19	114h 6m	-
Dwr Cymru Welsh Water	Heol Ddu Storm Overflow	Nant Dyfaty	15	102h 40m	-
Dwr Cymru Welsh Water	Llangennech Storm Overflow	River Loughor	55	95h 37m	-
Dwr Cymru Welsh Water	Ponthenri Storm Overflow	Gwendraeth Fawr	17	91h 42m	-
Dwr Cymru Welsh Water	Iscoed Road Storm Overflow	River Loughor	37	88h 27m	-
Dwr Cymru Welsh Water	Llanelli Northumberland Tanks Storm Overflow	Loughor Estuary	27	85h 55m	-
Dwr Cymru Welsh Water	Basset Terrace Storm Overflow	River Dulais	24	78h 27m	-
Dwr Cymru Welsh Water	Llanelli Bynea Storm Overflow	Tidal Pill of Loughor Estuary	12	69h 15m	-
Dwr Cymru Welsh Water	Station Road Kidwelly Storm Overflow	Gwendraeth Fach	31	61h 16m	-
Dwr Cymru Welsh Water	Station Road Kidwelly Overflow	Gwendraeth Fach	30	61h 16m	-
Dwr Cymru Welsh Water	Rhosnewydd Tumble Storm Overflow	Tributary of Gwendraeth Fawr	31	57h 19m	-
Dwr Cymru Welsh Water	Pontardulais Road Llangennech Storm Overflow	Afon Morlais	22	55h 57m	-
Dwr Cymru Welsh Water	Cefneithin Road Ddol Las Storm Overflow	Gwendraeth Fawr	15	52h 45m	-
Dwr Cymru Welsh Water	Llanelli Tir Einon Storm Overflow	River Dafen	19	49h 53m	-
Dwr Cymru Welsh Water	Bryngwili Road Green Storm Overflow	River Gwili	17	45h 23m	-
Dwr Cymru Welsh Water	Llanelli Station Road Junction Storm Overflow	River Lliedi	25	45h 11m	-
Dwr Cymru Welsh Water	Ashburnham Storm Overflow	Burry Port Harbour	8	33h 9m	-
Dwr Cymru Welsh Water	Hendy Arlan Gwili Storm Overflow	River Gwili	38	31h 44m	-
Dwr Cymru Welsh Water	Andrew Street Bridge Storm Overflow	River Lliedi	7	29h 38m	-
Dwr Cymru Welsh Water	Waungoch Storm Overflow	Unnamed Tributary of the Nant Glas	4	26h 30m	-
Dwr Cymru Welsh Water	Llanelli Cambrian Storm Overflow	Loughor Outer	11	17h 43m	-
Dwr Cymru Welsh Water	Llangyndeyrn Storm Overflow	Unnamed Tributary of Gwendraeth Fach	5	12h 54m	-
Dwr Cymru Welsh Water	Pontyberem WwTW Inlet Storm Overflow	Gwendraeth Fawr	10	12h 16m	-
Dwr Cymru Welsh Water	Llanelli Havard Road Storm Overflow	River Dafen	10	10h 3m	-
Dwr Cymru Welsh Water	Unknown	Unknown	6	9h	-
Dwr Cymru Welsh Water	Burry Port Ashburnham Road Storm Overflow	Disused Canal	8	8h 12m	-
Dwr Cymru Welsh Water	Llanelli Penyfan Playing Field Storm Overflow	River Lliedi	11	7h 6m	-
Dwr Cymru Welsh Water	Llwynuhilwg PS Overflow	Tributary of the River Dafen	2	6h 30m	-
Dwr Cymru Welsh Water	Lower Trostre Road Llanelli Overflow	River Dafen	6	6h 11m	-
Dwr Cymru Welsh Water	Y Gaer Llanelli Overflow	Dafen	8	5h 42m	-
Dwr Cymru Welsh Water	Llangyndeyrn WwTW Storm Overflow	Gwendraeth Fach	1	4h 53m	-
Dwr Cymru Welsh Water	Church Road Burry Port Storm Overflow	Nant Dyfatty	6	4h 14m	-
Dwr Cymru Welsh Water	Bryn Avenue Burry Port Storm Overflow	Tributary of Barnaby Pill	3	4h 12m	-
Dwr Cymru Welsh Water	Y Llwyn Llanelli Storm Overflow	River Dafen	3	3h 59m	-
Dwr Cymru Welsh Water	Heol Goffa Bridge Storm Overflow	River Lliedi	1	1h 44m	-
Dwr Cymru Welsh Water	Heol Nazareth Pontyates Storm Overflow	Gwendraeth Fawr	2	0h 59m	-
Dwr Cymru Welsh Water	Llanelli Halfway Storm Overflow	River Dafen	2	0h 45m	-
Dwr Cymru Welsh Water	Dyfatty Park Overflow	Drain leading to the River Loughor	1	0h 44m	-
Dwr Cymru Welsh Water	Upper Cross Road Llanelli Storm Overflow	River Dafen	1	0h 30m	-
Dwr Cymru Welsh Water	Ferryside Near Railway Track WwTW Storm Overflow	Ferryside Stream	1	0h 15m	-
Dwr Cymru Welsh Water	Unknown	Unknown	0	0h	-
Dwr Cymru Welsh Water	Heol Hen Storm Overflow	Unnamed Tributary of the River Loughor	0	0h	-
Dwr Cymru Welsh Water	Trostre Industrial Park Storm Overflow	River Dafen	0	0h	-
Dwr Cymru Welsh Water	Trimsaran Heol Llanelli Storm Overflow	Afon Morlais	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	Llanelli Y Llwyn Storm Overflow	River Dafen	0	0h	-
Dwr Cymru Welsh Water	Maestir Llanelli Storm Overflow	River Lliedi	0	0h	-
Dwr Cymru Welsh Water	Old Castle Road Storm Overflow	River Lliedi	0	0h	-
Dwr Cymru Welsh Water	Unknown	Unknown	0	0h	-
Dwr Cymru Welsh Water	Hendy Storm Overflow	River Gwili	0	0h	-
Dwr Cymru Welsh Water	Llanelli Swanfield Place Storm Overflow	River Lliedi	0	0h	-
Dwr Cymru Welsh Water	Llangennech Recreation Ground Storm Overflow	River Loughor	0	0h	-
Dwr Cymru Welsh Water	Unknown	Unknown	0	0h	-
Dwr Cymru Welsh Water	Thomas Street Storm Overflowi	River Lliedi	0	0h	-

It's a Dirty Business

Llanelli - 2025 Sewage

Polluted by sewage 25,155 hours in 2025 - That's 2.91 years

Llanelli - 2025 Sewage

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It's a Dirty Business

Llanelli - 2025 Sewage Polluted by sewage 25,155 hours in 2025 - That's 2.91 years

Llanelli - 2025 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 - 2025 Sewage

Polluted by sewage 25,155 hours in 2025 - That's 2.91 years