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Montgomeryshire and Glyndwr - 2025 Sewage

Polluted by sewage 6,978 hours in 2025

© OpenStreetMap contributors
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 Montgomeryshire and Glyndwr 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 Montgomeryshire and Glyndwr

Daily Data

Jan - 109 hours
Feb - 426 hours
Mar - 80 hours
Apr - 54 hours
May - 46 hours
Jun - 76 hours
Jul - 65 hours
Aug - 57 hours
Sept - 973 hours
Oct - 635 hours
Nov - 2,479 hours
Dec - 1,965 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 Commins Coch Storm Overflow River Twymyn 102 2,288h 56m -
Dwr Cymru Welsh Water Llanbrynmair Tafolwern WwTW Storm Overflow Afon Iaen 95 1,861h 41m -
Dwr Cymru Welsh Water Machynlleth WwTW Storm Overflow River Dyfi 52 400h 54m -
Dwr Cymru Welsh Water Machynlleth WwTW Settled Storm Overflow Garsiwn Ffos 52 400h 54m -
Dwr Cymru Welsh Water Glyn Ceiriog WwTW Overflow River Ceiriog 56 264h 31m -
Dwr Cymru Welsh Water Rhosllanerchrugog Pant Storm Overflow Afon Goch 62 237h 26m -
Dwr Cymru Welsh Water Cefn Mawr WwTW Storm Overflow River Dee 36 183h 18m -
Dwr Cymru Welsh Water Ceinws Esgairgeiliog Storm Overflow Afon Glesrych Estuary 16 167h 29m -
Dwr Cymru Welsh Water Pontfadog WwTW Storm Overflow River Ceiriog 19 145h 36m -
Dwr Cymru Welsh Water Bersham Colliery Railway Storm Overflow Glanyrafon Brook 25 140h 38m -
Dwr Cymru Welsh Water Cefn Storm Overflow Tref-Y-Nant Brook 39 113h 34m -
Dwr Cymru Welsh Water Heol Y Doll Machynlleth Storm Overflow Garsiwn ditch 67 100h 46m -
Dwr Cymru Welsh Water Afon Eitha Storm Overflow Afon Goch 44 83h 4m -
Dwr Cymru Welsh Water Off Llangollen Road Cefn-mawr Storm Overflow Tref-Y-Nant Brook 17 70h 29m -
Dwr Cymru Welsh Water North West of Bro-Ddewi Dolywern Storm Overflow River Ceiriog 20 55h 21m -
Dwr Cymru Welsh Water Ffordd Offa Rhosllanerchrugog Storm Overflow Unnamed Watercourse 26 54h 48m -
Dwr Cymru Welsh Water Penycae Storm Overflow Afon Eitha 10 47h 30m -
Dwr Cymru Welsh Water Bangor Road Rhosllanerchrugog Storm Overflow Black Brook 22 42h 57m -
Dwr Cymru Welsh Water Paddock Row Ruabon Storm Overflow No2 Afon Eitha 15 41h 11m -
Dwr Cymru Welsh Water Chirk Canal Wood Storm Overflow River Bradley 13 39h 45m -
Dwr Cymru Welsh Water Machynlleth Popular Terrace Storm Overflow Unnamed Ditch 14 33h 52m -
Dwr Cymru Welsh Water Y Gamer Glyn Ceiriog Storm Overflow River Ceiriog 33 30h 44m -
Dwr Cymru Welsh Water Bryn Glas Rhosllanerchrugog Storm Overflow Afon Goch 20 26h 43m -
Dwr Cymru Welsh Water Trofryn Rhosllanerchrugog Overflow River Eitha 9 24h 41m -
Dwr Cymru Welsh Water Offa Street Chirk Storm Overflow Tributary of the Afon Dyfrdwy 6 23h 26m -
Dwr Cymru Welsh Water Colliery Road Rhostyllen Storm Overflow Glanyrafon Brook 26 22h 57m -
Dwr Cymru Welsh Water Aberderfyn Road Rhosllanerchrugog Storm Overflow Aberderfyn 14 22h 49m -
Dwr Cymru Welsh Water Park Road Rhosymedre Storm Overflow Tributary of the River Dee 7 16h 26m -
Dwr Cymru Welsh Water Next to Bridge Newbridge Overflow River Dee 5 11h -
Dwr Cymru Welsh Water Paddock Row Ruabon Storm Overflow Afon Eitha 3 8h 32m -
Dwr Cymru Welsh Water Garsiwn Ditch Storm Overflow Garsiwn Ditch 11 7h 55m -
Dwr Cymru Welsh Water New Road Wrexham Storm Overflow Tref-Y-Nant Brook 9 6h 30m -
Dwr Cymru Welsh Water South of Hampden Way Wrexham Storm Overflow Tributary of the Afon Dyfrdwy 2 1h 14m -
Dwr Cymru Welsh Water Dolywern WwTW Storm Overflow River Ceiriog 2 0h 45m -
Dwr Cymru Welsh Water Bontdolgadfan Storm Overflow River Twymyn 0 0h -
Dwr Cymru Welsh Water Unknown Unknown 0 0h -
Dwr Cymru Welsh Water Chirk Settled Storm Overflow River Bradley 0 0h -
Dwr Cymru Welsh Water Chapel Lane and Lloyds Lane Chirk Storm Overflow Unnamed Ditch leading to Bradley Brook 0 0h -
Dwr Cymru Welsh Water New Hall Road Ruabon Storm Overflow Afon Goch 0 0h -
Dwr Cymru Welsh Water Pont-Yr-Afon Field Storm Overflow Afon Eitha 0 0h -
Dwr Cymru Welsh Water Machynlleth WwTW Inlet Storm Overflow Garsiwn Ditch 0 0h -
Dwr Cymru Welsh Water Llangurig Storm Overflow River Wye 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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© 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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