Llanelli was polluted by sewage 3,647 times in 2023
lasting 32,570 hours - that's 3.77 years!
- but monitoring was disabled in some locations, so could be more

Constituency

Select the constituency from the drop-down

✔ means we have experimental daily data since 2023

Totals for Llanelli in 2023

72 Sites polluted by Dwr Cymru Welsh Water

3,647 sewage dumps
32,570 h duration

That's 3.77 years! On average 10 times a day

Change Over Time

Take Action

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Constituencies near Llanelli

Waterways in Llanelli

Pollution Summary 2023

Here are all the reported sewage overflow totals for Llanelli in 2023. Sometimes sewage can be being dumped for months at a time.

Reporting refers to how much of the time the monitoring was active. In this constituency 1 of the total 85 CSO locations had reporting enabled for less than half the year, of which 1 had zero reporting.

Company	Waterway	Site	Sewage Dumps	Duration (Hours)	Reporting %
Dwr Cymru Welsh Water	Gwendraeth Fawr	Settled Storm Overflow at Pontyberem Wastewater Treatment Works	199	3,481	99.9
Dwr Cymru Welsh Water	Gwendraeth Fawr	Trimsaran Waste Water Treatement Works Settled Storm	173	2,747	100
Dwr Cymru Welsh Water	River Gwendraeth Fach	LLANDDAROG WWTW LLANDDAROG CARMARTH	128	2,654	99.9
Dwr Cymru Welsh Water	Unknown Loughor Estuary	PEMBREY WWTW CSO	113	2,129	98.8
Dwr Cymru Welsh Water	River Gwili	Storm Overflow at Llanedi Wastewater Treatment Works	210	1,920	99.9
Dwr Cymru Welsh Water	Nant Cwm Croes Y Ceiliog	IDOLE CWMFFRWD SEWERAGE SCHEME	115	1,791	99.8
Dwr Cymru Welsh Water	Ferryside Stream	FERRYSIDE STW FERRYSIDE CARMS	124	1,533	93
Dwr Cymru Welsh Water	Llansaint Stream	LLANSAINT WWTW LLANSAINT FERRYSIDE	99	1,411	100
Dwr Cymru Welsh Water	River Morlais	LLANON STW	66	1,136	92.9
Dwr Cymru Welsh Water	River Dulias	MYNNYDD CERRIG PUMPING STATION	99	1,080	98.3
Dwr Cymru Welsh Water	River Gwili	CROSSHANDS WWTW	142	993	100
Dwr Cymru Welsh Water	Nant Mwrwg	CSO at Rear of Trio Engineer'g Llangennech	101	738	100
Dwr Cymru Welsh Water	Barnaby Pil	CSO Behind 8 Pwll Road, Pwll	42	649	94.7
Dwr Cymru Welsh Water	River Dafen	East of Kingfisher Court CSO	45	647	98.6
Dwr Cymru Welsh Water	Gwendraeth Fach	GARREG SPS LLANGADOG KIDWELLY	45	581	88.3
Dwr Cymru Welsh Water	Gwendraeth Fawr	SOC4 PONTYATES AREA CSO	72	555	99.8
Dwr Cymru Welsh Water	River Marlias	LLANNON STW LLANNON LLANELLI	37	515	30.3
Dwr Cymru Welsh Water	Loughor Estuary	LLANELLI WWTW BERWICK ROAD BYNEA	81	494	99.9
Dwr Cymru Welsh Water	River Loughor	PEN Y BANC CSO 40 ON HENDRE SEWER	98	492	98.5
Dwr Cymru Welsh Water	Unnamed Canal To Tywi Estuary	SWO. BURRY PORT AREA - INTO O	77	488	99.9
Dwr Cymru Welsh Water	Gwendraeth Fawr	Clos Isaf CSO, Drefach	85	484	100
Dwr Cymru Welsh Water	River Dafen	St Michael’s Church CSO	39	477	99.5
Dwr Cymru Welsh Water	Gwendraeth Fawr	Parc Y Dai No1 CSO Drefach	112	452	98.6
Dwr Cymru Welsh Water	Gwendraeth Fawr	New Lodge Inn CSO Pontyberem Carm	74	413	99.9
Dwr Cymru Welsh Water	Gwendraeth Fawr	Pontyberem No2 SPS	59	410	99.8
Dwr Cymru Welsh Water	Nant Y Gro	CSO at Trimsaran WWTW Spudder Bridge Road	175	383	100
Dwr Cymru Welsh Water	River Gwili	Cwmtawel Wastewater Treatment Works Inlet Storm Overflow (CSO)	25	370	99.9
Dwr Cymru Welsh Water	Of River Dafen	LLWYNUHILWG PS EMERG , ,	16	306	100
Dwr Cymru Welsh Water	Ferryside Stream	FERRYSIDE PS . .	47	296	99.9
Dwr Cymru Welsh Water	Gwendraeth Fawr	BLAENHIRWAUN CSO CEFNEITHIN	41	286	100
Dwr Cymru Welsh Water	Gwendraeth Fawr	CSO at Cwm Mawr Rb No1 Gwendreath Catchmen	45	222	100
Dwr Cymru Welsh Water	Gwendraeth Fawr	Tom Jones Nursery CSO	51	207	99.6
Dwr Cymru Welsh Water	Nant Mwrwg Tidal	SSO LLANGENNECH PS CARMS	96	199	99.9
Dwr Cymru Welsh Water	Gwendraeth Fawr	Parc y Dai CSO	65	196	97.9
Dwr Cymru Welsh Water	Gwendraeth Fach	Settled Storm Overflow at Llangyndeyrn Wastewater Treatment Works	28	162	100
Dwr Cymru Welsh Water	River Morlais	CSO at 250 M DOWN STREAM OF GLAN-YR-AFON	45	162	99.9
Dwr Cymru Welsh Water	River Loughor Estuary	PWLL SEWAGE PUMPING STATION CARMS	11	155	100
Dwr Cymru Welsh Water	Gwendraeth Fawr	HEOL MEINCIAU CSO	36	154	99.9
Dwr Cymru Welsh Water	Swan Pool Drain	LINKS PEMBREY PS EMERG , ,	28	137	99.3
Dwr Cymru Welsh Water	Gwendraeth Fawr	CSO at Access Road To Pontyberem STW	29	105	99.9
Dwr Cymru Welsh Water	An Barnaby Pil	Burry Port Sewage Pumping Station	22	100	98
Dwr Cymru Welsh Water	River Dafen	CSO at Heol Cropin SPS	12	93	100
Dwr Cymru Welsh Water	Gwendraeth Fawr	PONT HENRI INCLINE INN CSO	18	85	99.8
Dwr Cymru Welsh Water	Gwendraeth Fach Estuary	SSO AT STATION ROAD P.S. KIDWELLY	32	78	100
Dwr Cymru Welsh Water	Gwendraeth Fach Estuary	SSO AT STATION ROAD P.S. KIDWELLY	32	78	100
Dwr Cymru Welsh Water	River Dulais	SANDY SPS (A484 o/s gate to Sandy PS)	22	76	98
Dwr Cymru Welsh Water	River Gwili	CSO At Hendy On Left Bank Of River	72	74	96.5
Dwr Cymru Welsh Water	Tidal Pill Of Loughor Estuary	Bynea Sewage pumping Station	16	74	99.8
Dwr Cymru Welsh Water	Nant Dyfaty	Heol Ddu SPS	19	61	100
Dwr Cymru Welsh Water	Pîl Dafen	CSO 49 Tir Einon, Llwynhendy	28	47	96.6
Dwr Cymru Welsh Water	Gwendraeth Fawr	27 RHOSNEWYDD MAESYGWERN CSO TUMBLE	42	37	88.5
Dwr Cymru Welsh Water	Burry Port Harbour Via Drain	Ahshburnham SPS CSO	10	23	99.7
Dwr Cymru Welsh Water	River Gwili	Bryngwili Rd CSO, Hendy	16	22	98.2
Dwr Cymru Welsh Water	River Lliedi	Llanelli - Head Post Office CSO	18	20	29.5
Dwr Cymru Welsh Water	Unnamed Utuary Of Gwendreath Fach	CSO at Llangynderyn PS into R Gwendraeth Fach	6	15	100
Dwr Cymru Welsh Water	Loughor Outer	Cambrian Street P.S. SSO	16	13	100
Dwr Cymru Welsh Water	Gwendraeth Fawr	CARWAY WWTW CARWAY CARMS	32	9	94.5
Dwr Cymru Welsh Water	Gwendraeth Fawr	Ddoll Las Temporary CSO Llanelli	6	7	100
Dwr Cymru Welsh Water	River Dafen	Havard Road CSO	16	7	99.9
Dwr Cymru Welsh Water	River Lliedi	SWO.BELOW PENYFAN QUARRY(S158) LLAN	14	6	100
Dwr Cymru Welsh Water	Disused Canal	Ashburnham Road CSO	10	6	100
Dwr Cymru Welsh Water	Nant Dyfatty	CWM CAPEL PS BURRY PORT	2	2	100
Dwr Cymru Welsh Water	Gwendraeth Fawr	HEOL NAZARETH 2 CSO	2	1	100
Dwr Cymru Welsh Water	River Dafen	HALFWAY PS DAFEN LLANELLI CARMS	2	1	99.9
Dwr Cymru Welsh Water	River Lliedi	HEOL GOFFA ROAD CSO LLANELLI CARMS	1	1	100
Dwr Cymru Welsh Water	Nant Dyfatty	CHURCH ROAD CSO BURRY PORT LLANELLI	1	0	54.4
Dwr Cymru Welsh Water	Barnaby Pil	Bryn Avenue CSO	2	0	100
Dwr Cymru Welsh Water	River Lliedi	CSO BELOW ANDREW STREET BRIDGE LLAN	1	0	74.4
Dwr Cymru Welsh Water	Surf W System To River Dafen	ST GEORGE COTTAGES CSO COEDCAE	1	0	96.7
Dwr Cymru Welsh Water	Nant Glas	Waungoch SPS CSO	1	0	100
Dwr Cymru Welsh Water	Drain Leading To River Loughor	DYFATTY PARK SPS, BURRY PORT	1	0	100
Dwr Cymru Welsh Water	River Loughor	Ynys Tomenlle CSO Iscoed R'd Hendy	1	0	100
Dwr Cymru Welsh Water	River Lliedi	Llanelli - O/S Thomas Brothers CSO	0	0	100
Dwr Cymru Welsh Water	Un	HEOL HEN CSO LLWYNHENDY LLANELLI	0	0	94.5
Dwr Cymru Welsh Water	Tidal Nant Mwrwg	LLANGENNECH P.STN.SSO LLANELLI	0	0	100
Dwr Cymru Welsh Water	River Dafen	Halfway Area CSO, Y Llwyn, Coedcae	0	0	95.5
Dwr Cymru Welsh Water	River Dulais	YARD BRIDGE CSO SANDY RD PWLL LLAN	0	0	32
Dwr Cymru Welsh Water	River Gwili	Hendy SPS	0	0	63.7
Dwr Cymru Welsh Water	River Morlais	HEOL WAUN Y CLUN CSO TRIMSARAN	0	0	100
Dwr Cymru Welsh Water	River Lliedi	BUCKLEYS CELLAR CSO LLANELLI	0	0	98.3
Dwr Cymru Welsh Water	River Dafen Via Surface Water Culvert	Pencae Terrace CSO	0	0	86.3
Dwr Cymru Welsh Water	Unnamed Stream To Outer Harbou	SHORELINE PS BURRY PORT	0	0	99.7
Dwr Cymru Welsh Water	Of Gwendraeth Fach	TYCOCH SEWAGE PUMPING STATION KIDW	0	0	50
Dwr Cymru Welsh Water	River Lliedi	CSO at 52 Maestir, Llanelli	0	0	61.9
Dwr Cymru Welsh Water	River Loughor	Combined Sewer Overflow 15	0	0	0

Data Sources & Accuracy

EDM (Event Duration Monitoring) data and Consented Discharges to Controlled Waters with Conditions from Environment Agency & Data Map Wales, and Scottish Water

Experimental derived data from Thames Water API, Some data may be missing or inaccurate. This uses Environment Agency rainfall data from the real-time data API (Beta) - Rainfall data is delayed by up to two days.

This website is intended to provide an accurate representation of the Environment Agency data. The data is hard to use, and thus some errors may have been made. If you find something that is incorrect, please raise an issue at the GitHub issues page and we'll endeavour to fix it quickly.

This project is not associated, approved or endorsed by any of the companies whose logos you see here.

Analysing sewage pollution by the Water Industry

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