Vale of Glamorgan polluted by sewage 1,767 times in 2023 - lasting 18,185 hours
- but monitoring was disabled in some locations, so could be more

© OpenStreetMap contributors
Contains OS Data © Crown copyright & database right 2021-2023
© Top of the Poops 2021-2023
✔ means we have experimental daily data since 2023
Totals for Vale of Glamorgan in 2023
46 Sites polluted by Dwr Cymru Welsh Water
1,767 sewage dumps
18,185 h duration
That's 2.1 years! On average 4.8 times a day
Change Over Time

Pollution Summary 2023

Here are all the reported sewage overflow totals for Vale of Glamorgan 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 2 of the total 58 CSO locations had reporting enabled for less than half the year, of which 2 had zero reporting.

Company Waterway Site Sewage Dumps Duration (Hours) Reporting %
Dwr Cymru Welsh Water River Ewenni Ewenni No 2 Pumping Station 198 4,299 99.9
Dwr Cymru Welsh Water River Ely A Sewage Pumping Station at Coslech Wastewater Treatment Works 164 2,172 100
Dwr Cymru Welsh Water Llandow Brook Llandow SPS 109 2,096 99.7
Dwr Cymru Welsh Water River Thaw COWBRIDGE STW COWBRIDGE VALE OF GLA 114 2,035 100
Dwr Cymru Welsh Water River Thaw Cowbridge STW Cowbridge Vale Of Glam 84 1,683 100
Dwr Cymru Welsh Water Bristol Channel, Break Sea Point West Aberthaw WWTW W Aberthaw Barry 88 1,372 92.6
Dwr Cymru Welsh Water River Thaw East Orchard Castle CSO 94 757 99.4
Dwr Cymru Welsh Water Nant Ganna Treoes Main SPS 35 587 99.7
Dwr Cymru Welsh Water An Nant Dyfrygi Ystrad Owen PS Vale Of Glamorgan 40 575 100
Dwr Cymru Welsh Water Severn Estuary LLANTWIT MAJOR WWTW (STW) WICK ROAD 69 465 100
Dwr Cymru Welsh Water North West Corner Of Barry BARRY DOCKS PS CSO OFF WIMBOURNE RD 210 305 99
Dwr Cymru Welsh Water River Ely Whitebridge PS Peterston Super Ely 42 241 99.9
Dwr Cymru Welsh Water River Weycock Weycock Cross SPS 22 167 99.5
Dwr Cymru Welsh Water Bristol Channel FONTYGARY SPS AND LOWER FONTYGARY S 19 156 96.7
Dwr Cymru Welsh Water Wrinstone Brook WENVOE SEWAGE PUMPING STATION 53 146 100
Dwr Cymru Welsh Water Coldbrook COLDBROOK RD EAST 2 BARRY 13 132 94.7
Dwr Cymru Welsh Water Bristol Channel Rhoose SPS 40 125 97.8
Dwr Cymru Welsh Water River Thaw Castileton Wood CSO, Barry 31 115 96.4
Dwr Cymru Welsh Water Bristol Channel BARRY TWN PS LSO ISLAND CAR PARK 83 106 95.1
Dwr Cymru Welsh Water Coldbrook DANIEL STREET CSO DANIEL STREET 17 103 100
Dwr Cymru Welsh Water River Ewenny EWENNY P.STN. NO. 1 EMERGEN 12 80 99.8
Dwr Cymru Welsh Water Whitelands Brook A SEWAGE PS PORTHKERRY SPS ASSET NO 8 69 99.8
Dwr Cymru Welsh Water Wrinstone Brook WENVOE CSO STATION ROAD EAST 14 61 98.6
Dwr Cymru Welsh Water Nant Ganna Llangan (NR Bridgend) SPS 34 58 99.9
Dwr Cymru Welsh Water R Cadoxton ST CADOCS AVENUE CSO 14 52 99.8
Dwr Cymru Welsh Water Bristol Channel BARRY TOWN PS ISLAND CAR PARK BARRY 38 48 98.8
Dwr Cymru Welsh Water River Colhuw Llantwit Major SPS 12 46 100
Dwr Cymru Welsh Water Highway - Colwinston Brook Storm Overflow and Emergency Overflow at Colwinston Pumping Station 7 35 82.5
Dwr Cymru Welsh Water Barry Brook CWM BARRY SPS PORTHKERRY PARK 6 21 99.9
Dwr Cymru Welsh Water Coldbrook FOOTPATH R/O WESTBURY CLOSE BARRY 16 14 86.2
Dwr Cymru Welsh Water River Ely PETERSTON SUPER ELY STW CSO MAIN AV 11 10 98.3
Dwr Cymru Welsh Water Barry Harbour BARRY TOWN PS (EMER) ISLAND CAR PK 12 9 100
Dwr Cymru Welsh Water Coldbrook MERTHYR DYFAN ROAD CSO BARRY 8 9 62.1
Dwr Cymru Welsh Water Nant Talwg WESTWOOD RISE PUMPING STATION 10 8 100
Dwr Cymru Welsh Water Nant Talwg NANT TALWG PS BARRY 1 4 100
Dwr Cymru Welsh Water Cold Brook Whitewell Road CSO 2, Barry 14 4 100
Dwr Cymru Welsh Water Coldbrook WHITEWELL ROAD CSO 1 BARRY 6 1 100
Dwr Cymru Welsh Water Coldbrook Barry - Coldbrook Road East CSO 5 1 99.8
Dwr Cymru Welsh Water Barry Dock No 1 HOLTON ROAD CSO HOLTON ROAD 5 1 100
Dwr Cymru Welsh Water Unnamed Watercourse Then Pumping Station Then Barry Docks CSO at BARRY - ST HILLARY RISE (REAR) 1 0 100
Dwr Cymru Welsh Water Barry Brook COLCOT ROAD/CLAUDE ROAD ASSEST NO 2 0 95.1
Dwr Cymru Welsh Water Barry Dock No1 A COMBINED SEWER OVERFLOW DYFRIG ST 2 0 99.8
Dwr Cymru Welsh Water Bristol Channel KNAP PS BARRY VALE OF GLAMORGAN 1 0 99.8
Dwr Cymru Welsh Water River Thaw Graig Penllyne SPS 1 0 99.9
Dwr Cymru Welsh Water Barry Old Harbour BARRY ISLAND PS 1 0 100
Dwr Cymru Welsh Water Coldbrook PRICE AVENUE CSO BARRY 1 0 96.6
Dwr Cymru Welsh Water Bristol Channel Fonmon Park SPS, Rhoose 0 0 0
Dwr Cymru Welsh Water Coldbrook BARRY BRIDGE STREET CSO BARRY 0 0 100
Dwr Cymru Welsh Water Nant Talwg NANT TALWG WAY PUMPING STATION 0 0 99.8
Dwr Cymru Welsh Water River Cadoxton ATLANTIC TRADING EST PS BARRY , 0 0 100
Dwr Cymru Welsh Water Barry Old Harbour KNAPP SEWAGE PUMPING STATION BARRY 0 0 99.1
Dwr Cymru Welsh Water Barry Brook A COMBINED SEWER OVERFLOW PONTYPRID 0 0 98.7
Dwr Cymru Welsh Water Tredogan Stream Tredogan SPS 0 0 100
Dwr Cymru Welsh Water Stembridge Brook Llysworney SPS 0 0 0
Dwr Cymru Welsh Water Coldbrook ARGAE LANE CSO ARGAE LANE BARRY 0 0 99.8
Dwr Cymru Welsh Water Rhoose Brook Station Rd CSO, Rhoose 0 0 98.1
Dwr Cymru Welsh Water Coldbrook COLDBROOK ROAD EAST 1 BARRY 0 0 68.1
Dwr Cymru Welsh Water River Thaw SPS Millfield Drive Cowbridge 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. 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.