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Caerfyrddin

Polluted by sewage 9,850 times in 2025 lasting 95,681 hours - That's 11.07 years!

Monitoring fell below 50% in some locations so could be more

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

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Live data for Caerfyrddin in 2026

So far this year (as of 18 May 2026, 12:00) there has been 41,964 hours of sewage overflows, from 143 CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway s - that's 4.86 years!

Totals for Caerfyrddin in 2025

128 Sites polluted by Dwr Cymru Welsh Water
9,850 sewage dumps
95,681 hours duration
That's 11.07 years. On average 27 times a day

Change Over Time

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Constituencies near Caerfyrddin

Waterways in Caerfyrddin

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Pollution Summary 2025

Here are all the reported sewage overflow totals for Caerfyrddin 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 1 of the total 133 CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway locations had reporting enabled for less than half the year.

Company Waterway Site Sewage Dumps Duration (Hours) Reporting %
Dwr Cymru Welsh Water River Marlais CSO 6 NR BRYN MARLAIS FARM 188 3,335 95.1
Dwr Cymru Welsh Water River Teifi RHYDFACH PS 149 3,096 99.2
Dwr Cymru Welsh Water River Marlais CARMEL WWTW CARMEL 161 3,017 99.9
Dwr Cymru Welsh Water River Cothi PONT-AR-GOTHI & NANTGAREDIG WWTW 136 2,730 99.9
Dwr Cymru Welsh Water River Cwm Wuan Gron TAVERNSPITE STW 131 2,510 99.9
Dwr Cymru Welsh Water Gwili BRONWYDD STW 197 2,494 99.9
Dwr Cymru Welsh Water River Cynin St Clears Sewage Pumping Station 183 2,373 99.9
Dwr Cymru Welsh Water River Tywi Cwm Ifor Wastewater Treatment Works 142 2,349 99.9
Dwr Cymru Welsh Water River Taf WHITLAND WWTW 139 2,305 99.9
Dwr Cymru Welsh Water River Lash PENYGROES WWTW SSO PONTLASH 157 2,302 99.9
Dwr Cymru Welsh Water River Teifi PENTRECWRT STW 275 2,280 99.9
Dwr Cymru Welsh Water River Bran LLANDOVERY WASTEWATER TREATMENT 134 2,208 99.7
Dwr Cymru Welsh Water Marlais BRECHFA STW - EMERGENCY DISCHA 133 2,201 99.9
Dwr Cymru Welsh Water River Cywyn BANCYFELIN STW BANCYFELIN NEAR ST 119 2,163 99.9
Dwr Cymru Welsh Water River Tywi FFAIRFACH STW 158 2,161 99.9
Dwr Cymru Welsh Water River Duad CYNWYL ELFED WWTW CYNWYL ELFED CARM 97 2,035 99.9
Dwr Cymru Welsh Water River Loughor CSO 14/43 PONT Y CLERC Rd AMMANFORD 135 1,996 99.9
Dwr Cymru Welsh Water River Duad SPS at Cwmduad STW 109 1,947 99.9
Dwr Cymru Welsh Water Taf Estuary LAUGHARNE WASTE WATER TREATMENT WKS 138 1,897 99.8
Dwr Cymru Welsh Water River Sannan LLANFYNYDD STW 169 1,845 99.9
Dwr Cymru Welsh Water River Amman CSO 33 5M DOWNSTREAM OF PIPE BRIDGE 128 1,782 99.9
Dwr Cymru Welsh Water River Marlas McKays Crossing CSO 114 1,458 97.1
Dwr Cymru Welsh Water River Teifi DREFACH/VELINDRE WWTW 87 1,382 99.9
Dwr Cymru Welsh Water Nant Rhydian-Ddu Porthyrhyd PS 94 1,335 99.9
Dwr Cymru Welsh Water River Gwenlais CILYCWM WWTW 162 1,321 99.4
Dwr Cymru Welsh Water River Teifi CENARTH PS 97 1,217 99.9
Dwr Cymru Welsh Water River Gwili LLANPUMPSAINT Wastewater treatment Worrks 87 1,167 98.4
Dwr Cymru Welsh Water River Taf CRAIGWEN PS TENBY ROAD ST CLEARS 88 1,092 99.9
Dwr Cymru Welsh Water River Teify CSO and SPS at LLANBYTHER (MANHOLE 7 )EMERGEN 84 1,086 99.9
Dwr Cymru Welsh Water River Myddyfi SALEM STW 97 1,028 99.8
Dwr Cymru Welsh Water River Mamog River Cych CAPEL IWAN STW 55 1,018 99.9
Dwr Cymru Welsh Water U River Towy Pencoed Farm SPS, Llangain 75 1,015 99.9
Dwr Cymru Welsh Water River Marlais CSO 4 Manhole 225A Adj 3 Rawlings 51 973 99.7
Dwr Cymru Welsh Water Nant Alltwalis ALLTWALIS PS 78 973 99.9
Dwr Cymru Welsh Water River Amman CSO Near 11 Upper Station Rd 102 963 99.9
Dwr Cymru Welsh Water River Sawdde LLANGADOG STW 95 941 98.8
Dwr Cymru Welsh Water Trelissey Stream RED ROSES STW 69 888 99.8
Dwr Cymru Welsh Water River Tywi Ashfield Road P.S. Ashfield Llangado 51 874 93.8
Dwr Cymru Welsh Water River Marlais 29 Aberlash Rd CSO, Llandybie 61 871 99.4
Dwr Cymru Welsh Water River Gwili Abergwili SPS 111 841 99.8
Dwr Cymru Welsh Water River Loughor CSO 16 PANTYFFYNON RAILWAY BRIDGE 91 837 99.9
Dwr Cymru Welsh Water River Amman CSO 28 AT MANHOLE 89 NR AMMAN RFC 87 791 98.9
Dwr Cymru Welsh Water River Teifi Via An Un- Llanybydder CSO 77 782 99.5
Dwr Cymru Welsh Water River Teifi Emlyn Arms CSO Newcastle Emlyn 115 754 96.6
Dwr Cymru Welsh Water River Gwili CWMGWILI WWTW CWMGWILI NR AMMANFORD 55 711 99.9
Dwr Cymru Welsh Water River Gwili 100M D/S R'DBR CWMGWILI (CSO) CARMS 91 668 80.5
Dwr Cymru Welsh Water Nant Ddu TALLEY WWTW LLANDEILO CARMS 58 647 99.9
Dwr Cymru Welsh Water Tywi Estuary Jewsons CSO Tanerdy Carmarthen 97 641 99.9
Dwr Cymru Welsh Water Nant Wthan Saron - A484 O.S. Maesgeler 39 632 96.6
Dwr Cymru Welsh Water Unnamed Stream Ty Hen Rhos PS 53 625 99.9
Dwr Cymru Welsh Water River Tywi CSO Pothouse Wharf PS 102 609 99.8
Dwr Cymru Welsh Water River Tywi Llansadwrn SPS 54 593 98.2
Dwr Cymru Welsh Water River Twrch FARMERS STW 54 588 99.9
Dwr Cymru Welsh Water Groundwater Via Infiltration System PENDINE SEWAGE TREATMENT WORKS 84 580 99.3
Dwr Cymru Welsh Water Nant Y Ci CSO 9 10 METRES DOWNSTREAM - BRIDGE 99 557 99.9
Dwr Cymru Welsh Water Nant Gurrey Fach Sawmills Y'd CSO Llandeilo Carmarthen 44 549 99.2
Dwr Cymru Welsh Water River Cennen Primary School CSO Ffairfach 84 529 99.9
Dwr Cymru Welsh Water River Cothi PONTARGOTHI P.S.EMERG. 45 495 99.7
Dwr Cymru Welsh Water River Amman CSO 37, Manhole 24B, Betws Rd Bridge 91 489 99.2
Dwr Cymru Welsh Water Towy Carmarthen Old Llansteffan Rd CSO 106 478 98
Dwr Cymru Welsh Water River Gorlech ABERGORLECH SPS 34 438 99.9
Dwr Cymru Welsh Water River Bargoed Llysnewydd SPS 51 422 99.9
Dwr Cymru Welsh Water River Gwili CSO 50m D/S From Culvert Meadows R'd 57 404 99.9
Dwr Cymru Welsh Water Nant Mynachdy FELINGWM WASTEWATER TREATMENT WORKS 79 394 99.4
Dwr Cymru Welsh Water Nant Crychiau PENIEL PS PENIEL CARMARTHEN , 26 383 99.9
Dwr Cymru Welsh Water River Cynin TRELECH STW TRELECH CARMARTHEN , 62 380 99.9
Dwr Cymru Welsh Water Culverted Mackerel Lake Stream WOGAN MEWS CSO LAUGHARNE CARMS 67 379 93.1
Dwr Cymru Welsh Water River Taf Whitland Terminal Pumping Station CSO and EO 76 377 99.9
Dwr Cymru Welsh Water Nant Y Wrach CAERBRYN R'D CSO PENYGROES CARMS 77 374 99.9
Dwr Cymru Welsh Water River Tywelli PENCADER STW 57 355 93.6
Dwr Cymru Welsh Water River Towy CARMARTHEN - STATION ROAD PUMP 125 345 95.9
Dwr Cymru Welsh Water Nant Hedfron, River Taf LLANDDOWROR VILLAGE P.S 34 339 99.9
Dwr Cymru Welsh Water River Tywelli Pencader SPS 43 338 99.8
Dwr Cymru Welsh Water River Bantwen LLANDDAROG PS EO CWMISFAEL CARMS 90 328 99.9
Dwr Cymru Welsh Water Un To River Bran Myddfai Village Sewerage Scheme CSO 138 322 99.9
Dwr Cymru Welsh Water River Twrch GEORGE IV CSO 23 UPPER CWMTWRCH 45 315 99.9
Dwr Cymru Welsh Water River Teifi Cwmann SPS 119 308 99.9
Dwr Cymru Welsh Water River Tywi LLANDEILO CSO 105 300 98.3
Dwr Cymru Welsh Water River Gwili Cwmdwyfran SPS 29 296 99.9
Dwr Cymru Welsh Water Gwendraeth Fach Pencader Bridge CSO 41 294 99.6
Dwr Cymru Welsh Water River Bran Llandovery No1 SPS 86 286 99.9
Dwr Cymru Welsh Water River Gronw CSO at Llanboidy WwTW 44 282 99.9
Dwr Cymru Welsh Water River Towy Morfa Lane CSO, Carmarthen 120 264 99
Dwr Cymru Welsh Water River Teifi WILKES HEAD CSO LLANDYSUL CERED'N 46 261 99.8
Dwr Cymru Welsh Water Nant Llynfell Swo No 11 Nr Glanyrafon Cwmlly CSO 57 258 75.1
Dwr Cymru Welsh Water River Amman CS0 34 100M DOWNSTREAM OF BRIDGE 37 229 99.9
Dwr Cymru Welsh Water River Loughor Penybanc Rd 2 CSO 64 227 99
Dwr Cymru Welsh Water Tywi Estuary Old Priory Row CSO Parc Hinds PS C 93 219 99.9
Dwr Cymru Welsh Water Loughor - Conf With Marlais To Conf With Aman Nant Arw CSO, Capel Hendre 57 219 82.3
Dwr Cymru Welsh Water River Gronw 15 Meters D/S Whitland Bridge CSO 74 218 98.9
Dwr Cymru Welsh Water River Amman CSO 36 Manhole 31c Opp Bettws Pk 72 216 98.2
Dwr Cymru Welsh Water River Amman Penpound Lane CSO 56 208 94.6
Dwr Cymru Welsh Water Nant Corrwg Brynmeillion SPS Llanpumsaint 65 200 99.8
Dwr Cymru Welsh Water River Dulas CWRT HENRI STW CWRT HENRI CARMS 60 199 99.9
Dwr Cymru Welsh Water Unknown Of River Towy Carmarthen - Sticle Path 61 192 96.8
Dwr Cymru Welsh Water River Amman CSO 29 At Manhole 76c Nr Hospital 54 189 99.9
Dwr Cymru Welsh Water River Brake Albion SPS 73 186 99.9
Dwr Cymru Welsh Water River Bran CYNGHORDY WWTW CYNGHORDY LLANDOVERY 48 181 99.9
Dwr Cymru Welsh Water River Duar Llanybydder - Oriel Jones CSO 33 172 89.2
Dwr Cymru Welsh Water River Towy Golden Grove WwTW Inlet CSO Llandie 79 163 99.5
Dwr Cymru Welsh Water Tawelan Brook CSO AT JOBSWELL ROAD 61 157 77.5
Dwr Cymru Welsh Water River Towy Llandeilo Yscubor Abad CSOs 82 145 98.8
Dwr Cymru Welsh Water River Amman CSO 21 NR FORGE WASHERY BRYNAMMAN 60 144 99.4
Dwr Cymru Welsh Water River Amman CSO 23 Manhole 125B Nr Brynbach FM 52 135 99.7
Dwr Cymru Welsh Water River Amman Station Road CSO, Brynamman 50 131 99.5
Dwr Cymru Welsh Water River Marlais Llandybie RFC CSO 45 127 99.5
Dwr Cymru Welsh Water River Amman CSO 38 500 M UP/STRM CONF LOUGHER 59 120 99.9
Dwr Cymru Welsh Water River Towy SPS at Castle Hill Drainage Area 86 116 99.3
Dwr Cymru Welsh Water River Bran FELIN FRAN PS LLANGADOG , 12 113 63.9
Dwr Cymru Welsh Water Tawelan Brook Settled Storm Overflow at Brickyard Lane Pumping Station 22 112 99.9
Dwr Cymru Welsh Water Nant-Y-Ci 153 Saron Rd CSO 35 102 99.6
Dwr Cymru Welsh Water Nant Gochen Cynwyl Village Bridge 14 102 99.5
Dwr Cymru Welsh Water Nant Grenig CSO 32 30M D/STRM A474 ROADBRIDGE 14 92 99.6
Dwr Cymru Welsh Water River Amman CSO 31 Manhole 72C Maesgrenig 35 68 99.4
Dwr Cymru Welsh Water Tawelan Brook Carmarthen Pentremeurig Road CSO 14 67 99.4
Dwr Cymru Welsh Water River Taf Llangynog STW 20 66 99.7
Dwr Cymru Welsh Water River Coran LAUGHARNE SEWERAGE SYSTEM 50 66 78.3
Dwr Cymru Welsh Water River Lash Gate Road Sewage Pumping Station Penygroes 13 56 99.9
Dwr Cymru Welsh Water Nant Harri Rhosmaen PS 37 49 99.9
Dwr Cymru Welsh Water River Teifi CWMANN SPS(EMERG'Y) CWMANN LAMPETER 18 45 99.9
Dwr Cymru Welsh Water River Loughor Old NCB Yard CSO, Penybanc 30 43 95.1
Dwr Cymru Welsh Water River Tywi Park Hinds CSO 2 29 99.9
Dwr Cymru Welsh Water Nant Pwntan PWNTAN SPS LLANGAIN CARMARTHENSHIRE 6 21 99.8
Dwr Cymru Welsh Water Gwendraeth Fach Llanddarog 11 19 99.9
Dwr Cymru Welsh Water River Amman CSO 19 HALL STREET BRYNAMMAN 13 16 99.1
Dwr Cymru Welsh Water River Melinddwr Llansawel Village CSO No2 5 7 99.5
Dwr Cymru Welsh Water Tawelan Carmarthen Near Fire Station CSO 5 1 100
Dwr Cymru Welsh Water Unnamed Utory Of River Sawdde Llangadog Common CSO 3 0 100
Dwr Cymru Welsh Water River Twrch CSO Felinfach Rd. Ystradowen. 0 0 99.2
Dwr Cymru Welsh Water Nant Arw Capel Hendre Sewage Scheme CSO 0 0 98
Dwr Cymru Welsh Water River Melinddwr LLANSAWEL . . 0 0 36.1
Dwr Cymru Welsh Water River Marlais LLANSAWEL WWTW 0 0 99.9
Dwr Cymru Welsh Water Tawelon Brook Pentremeurig Road CSO 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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