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Llanelli

Polluted by sewage 3,825 times in 2025 lasting 33,261 hours - That's 3.85 years!

© OpenStreetMap contributors
Contains OS Data © Crown copyright & database right 2021-2024
© Top of the Poops 2021-2024

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Live data for Llanelli in 2026

So far this year (as of 18 May 2026, 12:00) there has been 10,492 hours of sewage overflows, from 93 CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway s - that's 1.21 years!

Totals for Llanelli in 2025

77 Sites polluted by Dwr Cymru Welsh Water
3,825 sewage dumps
33,261 hours duration
That's 3.85 years. On average 10.5 times a day

Change Over Time

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Waterways in Llanelli

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Pollution Summary 2025

Here are all the reported sewage overflow totals for Llanelli in 2025. 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 all the declared CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway s appeared to have monitoring enabled for more than 50% of the year

Company Waterway Site Sewage Dumps Duration (Hours) Reporting %
Dwr Cymru Welsh Water River Marlias LLANNON STW LLANNON LLANELLI 150 2,825 99.9
Dwr Cymru Welsh Water River Gwendraeth Fach LLANDDAROG WWTW LLANDDAROG CARMARTH 139 2,803 99.9
Dwr Cymru Welsh Water Gwendraeth Fawr PONTYBEREM WWTW PONTYBEREM CARMS 154 2,659 99.9
Dwr Cymru Welsh Water River Gwili CROSSHANDS WWTW 205 2,242 94.75
Dwr Cymru Welsh Water Loughor Est'Y PEMBREY WASTEWATER TREATMENT WORKS 121 2,111 99.8
Dwr Cymru Welsh Water Gwendraeth Fawr TRIMSARAN WWTW SPUDDER BRIDGE RD 100 1,756 99.9
Dwr Cymru Welsh Water Llansaint Stream LLANSAINT WWTW LLANSAINT FERRYSIDE 111 1,734 99.8
Dwr Cymru Welsh Water Gwendraeth Fawr CARWAY WWTW CARWAY CARMS 155 1,579 99.9
Dwr Cymru Welsh Water River Dulias MYNNYDD CERRIG PUMPING STATION 106 1,318 99.8
Dwr Cymru Welsh Water River Gwili LLANEDI WWTW 208 1,237 99.9
Dwr Cymru Welsh Water River Gwili CWMTAWEL WWTW OFF A48 S CROSS HANDS 103 1,222 99.9
Dwr Cymru Welsh Water Nant Cwm Croes Y Ceiliog IDOLE CWMFFRWD SEWERAGE SCHEME 71 867 99.9
Dwr Cymru Welsh Water River Loughor Combined Sewer Overflow 15 121 819 98.6
Dwr Cymru Welsh Water Gwendraeth Fawr SOC4 PONTYATES AREA CSO 63 684 82.6
Dwr Cymru Welsh Water Gwendraeth Fawr BLAENHIRWAUN CSO CEFNEITHIN 76 584 84.2
Dwr Cymru Welsh Water Nant Y Gro CSO at Trimsaran WWTW Spudder Bridge Road 128 583 99.8
Dwr Cymru Welsh Water Barnaby Pil CSO Behind 8 Pwll Road, Pwll 31 480 99.7
Dwr Cymru Welsh Water River Loughor PEN Y BANC CSO 40 ON HENDRE SEWER 73 409 98.7
Dwr Cymru Welsh Water Ferryside Stream FERRYSIDE PS . . 54 404 99.9
Dwr Cymru Welsh Water Loughor Estuary LLANELLI WWTW BERWICK ROAD BYNEA 49 368 99.9
Dwr Cymru Welsh Water Gwendraeth Fawr Trimsaran Waste Water Treatement Works Settled Storm 33 368 99.5
Dwr Cymru Welsh Water Unnamed Canal To Tywi Estuary SWO. BURRY PORT AREA - INTO O 74 358 98.3
Dwr Cymru Welsh Water Gwendraeth Fawr Clos Isaf CSO, Drefach 83 356 99.9
Dwr Cymru Welsh Water River Dafen St Michael’s Church CSO 32 343 99.6
Dwr Cymru Welsh Water River Dafen East of Kingfisher Court CSO 36 326 99.8
Dwr Cymru Welsh Water Nant Mwrwg CSO at Rear of Trio Engineer'g Llangennech 71 324 99.9
Dwr Cymru Welsh Water River Loughor Ynys Tomenlle CSO Iscoed R'd Hendy 78 322 99.9
Dwr Cymru Welsh Water Gwendraeth Fawr Parc Y Dai No1 CSO Drefach 98 312 97.1
Dwr Cymru Welsh Water Gwendraeth Fawr New Lodge Inn CSO Pontyberem Carm 51 289 99.1
Dwr Cymru Welsh Water Gwendraeth Fawr CSO at Cwm Mawr Rb No1 Gwendreath Catchmen 42 258 99.9
Dwr Cymru Welsh Water Of Gwendraeth Fach TYCOCH SEWAGE PUMPING STATION KIDW 55 248 99.9
Dwr Cymru Welsh Water Nant Dyfatty CWM CAPEL PS BURRY PORT 17 226 99.9
Dwr Cymru Welsh Water Gwendraeth Fawr Tom Jones Nursery CSO 57 222 99.9
Dwr Cymru Welsh Water Gwendraeth Fach GARREG SPS LLANGADOG KIDWELLY 33 222 99.9
Dwr Cymru Welsh Water Gwendraeth Fawr Pontyberem No2 SPS 68 202 99.9
Dwr Cymru Welsh Water River Dulais SANDY SPS (A484 o/s gate to Sandy PS) 53 173 99.9
Dwr Cymru Welsh Water River Dafen CSO at Heol Cropin SPS 17 166 99.9
Dwr Cymru Welsh Water River Loughor Estuary PWLL SEWAGE PUMPING STATION CARMS 15 160 96.9
Dwr Cymru Welsh Water Gwendraeth Fawr HEOL MEINCIAU CSO 24 159 99.9
Dwr Cymru Welsh Water Gwendraeth Fawr Parc y Dai CSO 50 144 97.7
Dwr Cymru Welsh Water Swan Pool Drain LINKS PEMBREY PS EMERG , , 31 144 99.9
Dwr Cymru Welsh Water Nant Mwrwg Tidal SSO LLANGENNECH PS CARMS 73 129 99.9
Dwr Cymru Welsh Water River Morlais CSO at 250 M DOWN STREAM OF GLAN-YR-AFON 31 98 99.9
Dwr Cymru Welsh Water Nant Dyfaty Heol Ddu SPS 16 94 99.9
Dwr Cymru Welsh Water Gwendraeth Fawr PONT HENRI INCLINE INN CSO 18 94 99.8
Dwr Cymru Welsh Water River Loughor Estuary SSO. NORTHUMBERLAND OUTFALL 29 90 99.9
Dwr Cymru Welsh Water Gwendraeth Fawr 27 RHOSNEWYDD MAESYGWERN CSO TUMBLE 52 84 96.1
Dwr Cymru Welsh Water River Dulais YARD BRIDGE CSO SANDY RD PWLL LLAN 20 80 99.6
Dwr Cymru Welsh Water Tidal Pill Of Loughor Estuary Bynea Sewage pumping Station 15 72 99.9
Dwr Cymru Welsh Water PÃŪl Dafen CSO 49 Tir Einon, Llwynhendy 24 57 96.9
Dwr Cymru Welsh Water Gwendraeth Fawr Ddoll Las Temporary CSO Llanelli 15 54 99.9
Dwr Cymru Welsh Water River Lliedi Llanelli - Head Post Office CSO 27 39 81.5
Dwr Cymru Welsh Water An Barnaby Pil Burry Port Sewage Pumping Station 17 38 99.1
Dwr Cymru Welsh Water Gwendraeth Fach Estuary SSO AT STATION ROAD P.S. KIDWELLY 35 37 76
Dwr Cymru Welsh Water Gwendraeth Fach Estuary SSO AT STATION ROAD P.S. KIDWELLY 35 37 76
Dwr Cymru Welsh Water Burry Port Harbour Via Drain Ahshburnham SPS CSO 7 37 98.2
Dwr Cymru Welsh Water River Gwili CSO At Hendy On Left Bank Of River 52 35 93.8
Dwr Cymru Welsh Water River Gwili Bryngwili Rd CSO, Hendy 19 26 99.5
Dwr Cymru Welsh Water Nant Glas Waungoch SPS CSO 4 26 99.9
Dwr Cymru Welsh Water River Lliedi CSO BELOW ANDREW STREET BRIDGE LLAN 6 20 80
Dwr Cymru Welsh Water Loughor Outer Cambrian Street P.S. SSO 13 18 99.9
Dwr Cymru Welsh Water Unnamed Utuary Of Gwendreath Fach CSO at Llangynderyn PS into R Gwendraeth Fach 4 12 99.9
Dwr Cymru Welsh Water River Dafen Havard Road CSO 17 11 99.2
Dwr Cymru Welsh Water Gwendraeth Fawr CSO at Access Road To Pontyberem STW 7 9 99.9
Dwr Cymru Welsh Water Disused Canal Ashburnham Road CSO 9 8 92.4
Dwr Cymru Welsh Water Of River Dafen LLWYNUHILWG PS EMERG , , 2 6 99.8
Dwr Cymru Welsh Water River Lliedi SWO.BELOW PENYFAN QUARRY(S158) LLAN 14 6 99.5
Dwr Cymru Welsh Water Gwendraeth Fach LLANGYNDERYN WWTW KIDWELLY CARMS 2 4 99.8
Dwr Cymru Welsh Water Nant Dyfatty CHURCH ROAD CSO BURRY PORT LLANELLI 10 3 99.9
Dwr Cymru Welsh Water Barnaby Pil Bryn Avenue CSO 4 1 99.7
Dwr Cymru Welsh Water River Dafen HALFWAY PS DAFEN LLANELLI CARMS 4 1 99.8
Dwr Cymru Welsh Water River Lliedi HEOL GOFFA ROAD CSO LLANELLI CARMS 1 1 100
Dwr Cymru Welsh Water Gwendraeth Fawr HEOL NAZARETH 2 CSO 2 0 99.8
Dwr Cymru Welsh Water River Dafen Halfway Area CSO, Y Llwyn, Coedcae 2 0 100
Dwr Cymru Welsh Water River Dafen Via Surface Water Culvert Pencae Terrace CSO 1 0 96.1
Dwr Cymru Welsh Water Unnamed Stream To Outer Harbou SHORELINE PS BURRY PORT 1 0 96.9
Dwr Cymru Welsh Water Surf W System To River Dafen ST GEORGE COTTAGES CSO COEDCAE 1 0 100
Dwr Cymru Welsh Water River Lliedi BUCKLEYS CELLAR CSO LLANELLI 0 0 96.9
Dwr Cymru Welsh Water River Lliedi CSO at 52 Maestir, Llanelli 0 0 85.9
Dwr Cymru Welsh Water Drain Leading To River Loughor DYFATTY PARK SPS, BURRY PORT 0 0 99.9
Dwr Cymru Welsh Water Ferryside Stream FERRYSIDE STW FERRYSIDE CARMS 0 0 99.8
Dwr Cymru Welsh Water Un HEOL HEN CSO LLWYNHENDY LLANELLI 0 0 91.1
Dwr Cymru Welsh Water River Morlais HEOL WAUN Y CLUN CSO TRIMSARAN 0 0 99.8
Dwr Cymru Welsh Water River Gwili Hendy SPS 0 0 99.9
Dwr Cymru Welsh Water Tidal Nant Mwrwg LLANGENNECH P.STN.SSO LLANELLI 0 0 100
Dwr Cymru Welsh Water River Lliedi Llanelli - O/S Thomas Brothers CSO 0 0 100
Dwr Cymru Welsh Water Gwendraeth Fach Settled Storm Overflow at Llangyndeyrn Wastewater Treatment Works 0 0 100

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. Live sewage data from Stream Water API

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.

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Analysing sewage pollution by the Water Industry

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