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Wrexham - 2025 Sewage

Polluted by sewage 1,855 hours in 2025

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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 Wrexham 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 Wrexham

Daily Data

Jan - 0 hours
Feb - 53 hours
Mar - 9 hours
Apr - 32 hours
May - 102 hours
Jun - 69 hours
Jul - 45 hours
Aug - 6 hours
Sept - 161 hours
Oct - 26 hours
Nov - 618 hours
Dec - 728 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 Bangor on Dee WwTW Storm Overflow River Dee 33 415h 5m -
Dwr Cymru Welsh Water Marchwiel near Wrexham WwTW Storm Overflow Afon Clywedog 24 229h 35m -
Dwr Cymru Welsh Water Heol Penyfelin Nant Storm Overflow Afon Clywedog 21 145h 23m -
Dwr Cymru Welsh Water Ffordd Treftadaeth Wrexham Overflow River Gwenfro 24 107h 34m -
Dwr Cymru Welsh Water Gresford WwTW Storm Overflow River Alyn 29 107h 27m -
Dwr Cymru Welsh Water Penley Hospital Storm Overflow Ermal Brook 21 93h 13m -
Dwr Cymru Welsh Water Llay Singrett Storm Overflow Singret Brook 34 78h 13m -
Dwr Cymru Welsh Water Heol Llewelyn Coedpoeth Storm Overflow River Gwenfro 11 75h 27m -
Dwr Cymru Welsh Water Holt WwTW Storm Overflow River Dee 24 75h 8m -
Dwr Cymru Welsh Water Overton Wrexham WwTW Overflow River Dee 24 69h 37m -
Dwr Cymru Welsh Water Holland Road Brymbo Storm Overflow Tributary of Nant Brook 13 66h 45m -
Dwr Cymru Welsh Water Pandy Overflow River Alun 30 65h 23m -
Dwr Cymru Welsh Water Rossett Level Crossing Storm Overflow River Alyn 11 48h 16m -
Dwr Cymru Welsh Water Llwyn Onn Estate Wrexham Storm Overflow Unnamed Tributary of Afon Clywedog 28 43h 38m -
Dwr Cymru Welsh Water Chester Road Pulford Storm Overflow Pulford Brook 14 39h -
Dwr Cymru Welsh Water Maesgwyn Road Wrexham Storm Overflow River Gwenfro 54 26h 39m -
Dwr Cymru Welsh Water Rhosnesni Lane Wrexham Overflow River Gwenfro 4 26h 15m -
Dwr Cymru Welsh Water Tanyfron Road Southsea Storm Overflow River Gwenfro 5 23h 24m -
Dwr Cymru Welsh Water Maelor Way Overton WwTW Storm Overflow River Dee 13 21h 15m -
Dwr Cymru Welsh Water Queens Way Wrexham Storm Overflow River Gwenfro 10 20h 12m -
Dwr Cymru Welsh Water Pen Y Llyn Gwersyllt Storm Overflow Gwersyllt Fishpond 10 19h 19m -
Dwr Cymru Welsh Water Cherry Tree Road Bradley Storm Overflow River Alyn 15 17h 16m -
Dwr Cymru Welsh Water Llay Road Llay Storm Overflow Tributary of Afon Alyn 9 14h 55m -
Dwr Cymru Welsh Water Coedpoeth Talwrn Road No.1 Storm Overflow Tributary of Afon Gwenfro 4 9h -
Dwr Cymru Welsh Water Pandy Storm Overflow River Alyn 4 3h 45m -
Dwr Cymru Welsh Water Ruthin Berse Road Coedpoeth Storm Overflow Tributary of Afon Clywedog 7 2h 41m -
Dwr Cymru Welsh Water Cefn Y Bedd Storm Overflow River Alyn 8 2h 36m -
Dwr Cymru Welsh Water Church Road Minera Storm Overflow Afon Clywedog 6 2h 15m -
Dwr Cymru Welsh Water Ruthin Road Gegin Storm Overflow River Gwenfro 3 2h 12m -
Dwr Cymru Welsh Water Brook Street & Vicarage Hill Wrexham Storm Overflow River Gwenfro 5 1h 44m -
Dwr Cymru Welsh Water Holt Storm Overflow River Dee 4 1h 20m -
Dwr Cymru Welsh Water Wrexham Acton Storm Overflow Pond Adjacent 2 1h -
Dwr Cymru Welsh Water Caer Estyn Storm Overflow Tributary to Pulford Brook 0 0h -
Dwr Cymru Welsh Water Holt WwTW Overflow River Dee 0 0h -
Dwr Cymru Welsh Water Eyton Grove Storm Overflow Afon Clywedog 0 0h -
Dwr Cymru Welsh Water Yorke Street and Mount Street Wrexham Storm Overflow Surface Water Sewer 0 0h -
Dwr Cymru Welsh Water Heol Y Fro Storm Overflow River Gwenfro 0 0h -
Dwr Cymru Welsh Water Rivulet Road Wrexham Storm Overflow River Gwenfro 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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© 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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