Blaenau Gwent and Rhymney - 2025 Sewage

Polluted by sewage 10,110 hours in 2025 - That's 1.17 years

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

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View Annual Sewage Data

You're looking at the totals that we have calculated for sewage in Blaenau Gwent and Rhymney 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.

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Daily Data

We get information about overflowing CSOs since January 2025. Here is a chart of the last three months of data for Blaenau Gwent and Rhymney, here you can see overflows in red, the darker the red, the more the CSO overflowed that day.

Each CSO has a row, the most recent data is on the right hand side.

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Totals so far

Company Site Name Receiving Waterway Overflow Days Total Duration (hours) Total Duration (days)
Dwr Cymru Welsh Water Brynmawr Blackrock WwTW Storm Overflow River Clydach 104 1,366 h 30m 56.92
Dwr Cymru Welsh Water Abertysswg Troedrhiwfuwch Storm Overflow River Rhymni 72 721 h 42m 30.04
Dwr Cymru Welsh Water Park Place Storm Overflow River Sirhowy 123 659 h 21m 27.46
Dwr Cymru Welsh Water Beaufort Allotment Road Bridge Storm Overflow River Ebbw 84 644 h 57m 26.83
Dwr Cymru Welsh Water Deri Riverside Walk Bargoed Storm Overflow Nant Bargod Rhymni 57 594 h 15m 24.75
Dwr Cymru Welsh Water Bedwellty Road Bridge Storm Overflow River Taff Bargoed 127 511 h 30m 21.29
Dwr Cymru Welsh Water New Tredegar Business Park West Storm Overflow River Rhymni 30 329 h 40m 13.71
Dwr Cymru Welsh Water Pontlottyn Old Gasworks Storm Overflow River Rhymni 52 250 h 39m 10.42
Dwr Cymru Welsh Water Garibaldi Bridge Storm Overflow River Sirhowy 59 238 h 15m 9.92
Dwr Cymru Welsh Water The Square Street Abertillery Storm Overflow River Ebbw 34 238 h 5m 9.92
Dwr Cymru Welsh Water Marine Street Industrial Estate Storm Overflow River Ebbw 38 228 h 40m 9.5
Dwr Cymru Welsh Water Victoria Business Park Storm Overflow River Ebbw 19 199 h 20m 8.29
Dwr Cymru Welsh Water Commercial street near Sirhowy river Storm Overflow Sirhowy River 58 189 h 45m 7.88
Dwr Cymru Welsh Water Tredegar Greenfield Ter Storm Overflow Sirhowy River 53 183 h 26m 7.62
Dwr Cymru Welsh Water Dukestown road Tredegar Storm Overflow Sirhowy River 44 173 h 16m 7.21
Dwr Cymru Welsh Water Bargoed Viaduct Storm Overflow River Rhymni 31 171 h 46m 7.12
Dwr Cymru Welsh Water South of Pochin Crescent Storm Overflow Sirhowy River 28 171 h 38m 7.12
Dwr Cymru Welsh Water Abertillery Six Bells Colliery No. 2 Storm Overflow Ebbw Fach River 20 170 h 7m 7.08
Dwr Cymru Welsh Water Rhymney Walk Storm Overflow The River Rhymney 46 163 h 58m 6.79
Dwr Cymru Welsh Water The Terrace Rhymney Storm Overflow River Rhymni 43 160 h 31m 6.67
Dwr Cymru Welsh Water Vale Terrace 1 Storm Overflow Sirhowy River 18 148 h 13m 6.17
Dwr Cymru Welsh Water High Street Blaina Storm Overflow Nant Yr Ystruth 43 147 h 45m 6.12
Dwr Cymru Welsh Water Steelworks Road and Clos Pen Y Cae Storm Overflow River Ebbw 47 146 h 30m 6.08
Dwr Cymru Welsh Water Merthyr Road A4048 Roundabout Storm Overflow Sirhowy River 33 126 h 39m 5.25
Dwr Cymru Welsh Water Heol Y Waun Storm Overflow River Rhymney 31 125 h 36m 5.21
Dwr Cymru Welsh Water Berea Close Storm Overflow Ebbw Fach River 30 123 h 55m 5.12
Dwr Cymru Welsh Water Vicarage Rd Rear of Hill Rest Tregerar Storm Overflow River Sirhowy 42 113 h 33m 4.71
Dwr Cymru Welsh Water Bethania Cottages Storm Overflow River Rhymni 38 107 h 8m 4.46
Dwr Cymru Welsh Water Factory Road Field Storm Overflow Nant Bargoed Rhymney 10 99 h 30m 4.12
Dwr Cymru Welsh Water Carno Street Storm Overflow River Rhymney 34 94 h 25m 3.92
Dwr Cymru Welsh Water Abertillery Six Bells Colliery No. 1 Storm Overflow Ebbw Fach River 10 81 h 42m 3.38
Dwr Cymru Welsh Water Pont-Y-Gof Storm No.2 Overflow River Ebbw 7 77 h 34m 3.21
Dwr Cymru Welsh Water Bargoed Old Colliery Washery Storm Overflow River Rhymney 35 75 h 3.12
Dwr Cymru Welsh Water Pontlottyn Recreation Ground Storm Overflow River Rhymni 29 74 h 38m 3.08
Dwr Cymru Welsh Water Beaufort Road Storm Overflow Ebbw Fach River 33 71 h 45m 2.96
Dwr Cymru Welsh Water Junction of Scwrfa Road and Mechanic Square Storm Overflow River Sirhowy 27 71 h 7m 2.96
Dwr Cymru Welsh Water Aubrey Terrace Overflow Ebbw River 24 66 h 35m 2.75
Dwr Cymru Welsh Water Allotment Road Storm Overflow River Ebbw 12 62 h 41m 2.58
Dwr Cymru Welsh Water Rassau Road Flyover Storm Overflow Rasa Brook 29 62 h 39m 2.58
Dwr Cymru Welsh Water Steelworks Road Ebbw Vale Storm Overflow Ebbw Fawr 16 60 h 45m 2.5
Dwr Cymru Welsh Water Glan Ebbw Terrace Storm Overflow River Tillery 17 56 h 52m 2.33
Dwr Cymru Welsh Water Ebbw Vale Beaufort Rd Storm Overflow River Ebbw 41 56 h 24m 2.33
Dwr Cymru Welsh Water Pont-Y-Gof Storm Overflow Ebbw River 28 55 h 40m 2.29
Dwr Cymru Welsh Water Abertillery Tillery Street Storm Overflow River Tillery 22 52 h 21m 2.17
Dwr Cymru Welsh Water Railway View Storm Overflow River Sirhowy 40 52 h 10m 2.17
Dwr Cymru Welsh Water Tredegar Road Pennant Street Storm Overflow Ebbw Fach River 20 45 h 54m 1.88
Dwr Cymru Welsh Water Pengam Road Roundabout Aberbargoed Storm Overflow Tributary of Afon Rhymni 22 45 h 21m 1.88
Dwr Cymru Welsh Water King Street Brynmawr Storm Overflow Ebbw Fach River 26 39 h 13m 1.62
Dwr Cymru Welsh Water South Griffin Colliery Storm Overflow Ebbw Fach River 11 38 h 14m 1.58
Dwr Cymru Welsh Water Morgan Street Tredegar Storm Overflow Sirhowy River 27 35 h 29m 1.46
Dwr Cymru Welsh Water Basin Football Field Storm Overflow River Rhymni 16 33 h 43m 1.38
Dwr Cymru Welsh Water Coedcae Rassau Storm Overflow Nant Melyn 13 29 h 32m 1.21
Dwr Cymru Welsh Water Abertillery Glandwr Street Storm Overflow River Ebbw 12 29 h 20m 1.21
Dwr Cymru Welsh Water Market Road Nantyglo Storm Overflow River Ebbw Fach 6 29 h 1.21
Dwr Cymru Welsh Water Vale Terrace 2 Storm Overflow Sirhowy River 20 26 h 11m 1.08
Dwr Cymru Welsh Water Castle Street Abertillery Overflow River Ebdw Fach 20 20 h 35m 0.83
Dwr Cymru Welsh Water Fitzroy Avenue Roundabout Ebbw Vale Overflow River Ebbw 9 20 h 17m 0.83
Dwr Cymru Welsh Water Bryn Villas Storm Overflow River Ebbw Fach 8 19 h 39m 0.79
Dwr Cymru Welsh Water River Road Cwm Storm Overflow Ebbw Fach River 9 18 h 30m 0.75
Dwr Cymru Welsh Water Tredegar East of Pochin Crescent and A4048 Roundabout Storm Overflow River Sirhowy 5 18 h 27m 0.75
Dwr Cymru Welsh Water Holland Street Ebbw Vale Overflow River Ebbw 16 12 h 12m 0.5
Dwr Cymru Welsh Water Old School Site Nantyglo Storm Overflow Ebbw Fach River 6 8 h 58m 0.33
Dwr Cymru Welsh Water Augusta Park Ebbw Vale Storm Overflow Ebbw Fach River 9 7 h 45m 0.29
Dwr Cymru Welsh Water Chapel Road Six Bells Storm Overflow River Ebbw Fach 8 6 h 41m 0.25
Dwr Cymru Welsh Water Unknown Unknown 21 6 h 0.25
Dwr Cymru Welsh Water Unknown Unknown 6 5 h 57m 0.21
Dwr Cymru Welsh Water Marine Street and Dyffryn Place Junction Cwm Storm Overflow River Ebbw 4 5 h 43m 0.21
Dwr Cymru Welsh Water Ladies Row Storm Overflow Sirhowy River 6 4 h 38m 0.17
Dwr Cymru Welsh Water Limestone Road Storm Overflow Ebbw Fach River 4 3 h 32m 0.12
Dwr Cymru Welsh Water Brithdir Station Storm Overflow River Rhymni 2 3 h 15m 0.12
Dwr Cymru Welsh Water Brooklyn Terrace Storm Overflow River Ebbw 5 2 h 43m 0.08
Dwr Cymru Welsh Water Bargoed Station Road Storm Overflow River Rhymni 4 2 h 41m 0.08
Dwr Cymru Welsh Water Commercial Road Abertillery Storm Overflow River Ebbw 4 2 h 14m 0.08
Dwr Cymru Welsh Water Excelsior Street Storm Overflow River Ebbw 3 1 h 59m 0.04
Dwr Cymru Welsh Water Beaufort Terrace Storm Overflow River Ebbw 2 1 h 44m 0.04
Dwr Cymru Welsh Water Pant Street Storm Overflow River Rhymni 4 1 h 0.04
Dwr Cymru Welsh Water Victoria Road Six Bells Storm Overflow Ebbw Fach River 1 0 h 45m 0
Dwr Cymru Welsh Water Tredegar Road Rees Street Storm Overflow Ebbw Fach River 2 0 h 43m 0
Dwr Cymru Welsh Water Alexandra Place Tredegar Storm Overflow The Sirhowy River 3 0 h 43m 0
Dwr Cymru Welsh Water Lillian Grove Rear Storm Overflow Ebbw Fach River 2 0 h 38m 0
Dwr Cymru Welsh Water High Street West Abertillery Overflow River Tillery 2 0 h 29m 0
Dwr Cymru Welsh Water Badminton Grove Beaufort Road Storm Overflow Ebbw Fawr 1 0 h 15m 0
Dwr Cymru Welsh Water Station Hill Abertillery Storm Overflow River Tillery 1 0 h 15m 0
Dwr Cymru Welsh Water Crumlin Road Llanhilleth Storm Overflow River Ebbw 1 0 h 15m 0
Dwr Cymru Welsh Water Vale Terrace 3 Storm Overflow River Sirhowy 1 0 h 15m 0
Dwr Cymru Welsh Water Queens Square Ebbw Vale Storm Overflow Ebbw Fach River 1 0 h 15m 0
Dwr Cymru Welsh Water School Street New Tredegar Overflow River Rhymni 1 0 h 14m 0
Dwr Cymru Welsh Water Six Bells Road Storm Overflow Ebbw Fach River 1 0 h 14m 0
Dwr Cymru Welsh Water Canning Street Storm Overflow River Ebbw 1 0 h 6m 0
Dwr Cymru Welsh Water Harcourt Street Rear Storm Overflow River Ebbw 0 0 h 0
Dwr Cymru Welsh Water High Street Abertillery Storm Overflow River Tillery 0 0 h 0
Dwr Cymru Welsh Water Nantyglo Farm Road Junction of Market Road Storm Overflow Ebbw Fach River 0 0 h 0
Dwr Cymru Welsh Water Sannan Street Storm Overflow River Rhymni 0 0 h 0
Dwr Cymru Welsh Water Tillery Street Storm Overflow River Tyleri 0 0 h 0
Dwr Cymru Welsh Water Rose Hayworth Road Storm Overflow River Ebbw Fach 0 0 h 0
Dwr Cymru Welsh Water Lamb's Square Lower Square Storm Overflow River Ebbw 0 0 h 0
Dwr Cymru Welsh Water Westville Rhymney Overflow River Rhymni 0 0 h 0
Dwr Cymru Welsh Water Llwyn Helyg Storm Overflow Sirhowy River 0 0 h 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. 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.