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Newport West and Islwyn - 2025 Sewage

Polluted by sewage 13,443 hours in 2025 - That's 1.56 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 Newport West and Islwyn 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.

What's a potential overflow? If the CSO goes 'Offline' while its Overflowing, we don't know if it stopped overflowing until we get a 'Stop' event.

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Constituencies near Newport West and Islwyn

Daily Data

Jan - 208 hours
Feb - 2,078 hours
Mar - 1,782 hours
Apr - 775 hours
May - 28 hours
Jun - 69 hours
Jul - 150 hours
Aug - 59 hours
Sept - 656 hours
Oct - 399 hours
Nov - 2,762 hours
Dec - 4,473 hours
Daily data is experimental and data is not guaranteed to be accurate. Please inform us of any issue, we will fix.
Please note: We don't have rainfall data for Wales. If you know where to source it please let us know!
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Totals so far

Company Site Name Receiving Waterway Overflow Days Total Duration (hours) Offline/Potential Pollution
Dwr Cymru Welsh Water Tanybryn Risca Pontymister Storm Overflow River Ebbw 160 2,751h 34m -
Dwr Cymru Welsh Water Machen Close St Mellons Storm Overflow Severn Estuary 112 1,881h 40m -
Dwr Cymru Welsh Water Abercarn Welfare Ground Storm Overflow River Ebbw 110 1,858h 11m -
Dwr Cymru Welsh Water Western Valley LG Tanks Storm Overflow Severn Estuary 60 1,325h 29m -
Dwr Cymru Welsh Water Plas Machen Storm Overflow River Rhymni 83 1,280h 20m -
Dwr Cymru Welsh Water St. Johns Crescent Storm Overflow River Ebbw 59 577h 26m -
Dwr Cymru Welsh Water Berkerolles Road Storm Overflow River Ebbw 37 541h 39m -
Dwr Cymru Welsh Water Carnegie Court Storm Overflow Ebbw Fach River 78 516h 5m -
Dwr Cymru Welsh Water Tredegar Terrace Storm Overflow Rhynys Brook 34 399h 49m -
Dwr Cymru Welsh Water Maple Avenue Storm Overflow River Ebbw 109 336h 42m -
Dwr Cymru Welsh Water Waunfawr Park Storm Overflow River Ebbw 21 223h 45m -
Dwr Cymru Welsh Water Windsor Park Storm Overflow River Ebbw 40 207h 2m -
Dwr Cymru Welsh Water Cwmgelli Blackwood Storm Overflow Sirhowy River 53 200h 37m -
Dwr Cymru Welsh Water Brooklands Terrace Storm Overflow Nant Carn Brook 37 196h 18m -
Dwr Cymru Welsh Water Malvern Terrace Storm Overflow River Ebbw 19 143h 6m -
Dwr Cymru Welsh Water Tregwilym Close Storm Overflow River Ebbw 28 124h 36m -
Dwr Cymru Welsh Water Swffryd Storm Overflow Ebbw Fach River 65 123h 21m -
Dwr Cymru Welsh Water Rhiw Syr Dafydd Hill Storm Overflow Sirhowy River 37 109h 11m -
Dwr Cymru Welsh Water Woodfield Park Crescent Blackwood Overflow Sirhowy River 31 108h 8m -
Dwr Cymru Welsh Water Tredegar Street Storm Overflow Sirhowy River 12 82h 22m -
Dwr Cymru Welsh Water Oakfield Roundabout Storm Overflow Sirhowy River 23 67h 10m -
Dwr Cymru Welsh Water Commercial Street Risca Storm Overflow River Ebbw 24 54h 8m -
Dwr Cymru Welsh Water Rock and Fountain Playing fields Storm Overflow Sirhowy River 18 50h 3m -
Dwr Cymru Welsh Water Rifleman Street Storm Overflow River Ebbw 40 37h 27m -
Dwr Cymru Welsh Water Pont Gwaith Farm Lane Storm Overflow Sirhowy River 6 33h 15m -
Dwr Cymru Welsh Water Cardiff Road Newport Overflow Unnamed Watercourse (via Culvert) 9 27h 26m -
Dwr Cymru Welsh Water Forge Road Bassaleg Storm Overflow Tributary of Afon Ebbw 25 26h 5m -
Dwr Cymru Welsh Water Markham Manmoel Crossing Storm Overflow Sirhowy River 10 22h 45m -
Dwr Cymru Welsh Water Greenfield Road Old Treowen Storm Overflow River Ebbw 3 22h 15m -
Dwr Cymru Welsh Water Tregwilym Road No 1 Storm Overflow River Ebbw 3 21h 30m -
Dwr Cymru Welsh Water Thornhill Gardens Storm Overflow Tributary of Afon Ebbw Fawr 11 21h 28m -
Dwr Cymru Welsh Water Bryngoleu Street Blackwood Overflow River Rhymni 9 16h 52m -
Dwr Cymru Welsh Water Carnarvon Drive Storm Overflow Tributary of Ebbw Fawr 11 15h 44m -
Dwr Cymru Welsh Water Cwm Road Argoed Storm Overflow Sirhowy River 6 15h 26m -
Dwr Cymru Welsh Water High Street Abercarn Storm Overflow Nant Gwyddon 20 9h 24m -
Dwr Cymru Welsh Water South of Aster Close Risca Overflow River Ebbw 2 7h 57m -
Dwr Cymru Welsh Water Rogerstone Power Station Land Storm Overflow River Ebbw 12 4h 40m -
Dwr Cymru Welsh Water Allt-Yr-Yn Avenue Newport Overflow Unnamed Watercourse 3 1h 10m -
Dwr Cymru Welsh Water Torlais Street Storm Overflow Unnamed Tribuatary of Afon Ebbw 1 1h -
Dwr Cymru Welsh Water Gladstone Street Crosskeys Storm Overflow Ebbw Fawr 1 0h 15m -
Dwr Cymru Welsh Water Hollybush Ancient Druid Storm Overflow River Sirhowy 0 0h -
Dwr Cymru Welsh Water Cobden Street Rear Storm Overflow River Ebbw 0 0h -

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

Annual figures up to and including 2025 come from official water company returns. The 2026 figure is our own estimate, derived continuously from the companies' live data feeds.

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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© 2020-2025 Top-Of-The-Poops CC-BY-SA 4.0,
© Openstreetmap contributors, Contains OS data © Crown copyright and database right 2021-2025,
Contains Water UK National Storm Overflow Hub Data CC-BY-SA 4.0 and analysis © 2025 Top-Of-The-Poops

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