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Clwyd East - 2025 Sewage

Polluted by sewage 4,305 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 Clwyd East 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 Clwyd East

Daily Data

Jan - 0 hours
Feb - 187 hours
Mar - 93 hours
Apr - 84 hours
May - 109 hours
Jun - 325 hours
Jul - 72 hours
Aug - 55 hours
Sept - 625 hours
Oct - 170 hours
Nov - 1,311 hours
Dec - 1,260 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 Ruthin WwTW Overflow River Clwyd 72 852h 27m -
Dwr Cymru Welsh Water Llangollen WwTW Storm Overflow River Dee 37 311h 54m -
Dwr Cymru Welsh Water Wat'sDyke Avenue Holywell Storm Overflow Unnamed stream 13 266h -
Dwr Cymru Welsh Water Bronallt Leeswood Storm Oveerflow Unnamed Tributary of Afon Alyn 24 231h 15m -
Dwr Cymru Welsh Water Trefnant WwTW Overflow River Clwyd 47 229h 26m -
Dwr Cymru Welsh Water Llangollen Queen Street Storm Overflow River Cyflymen 40 164h 13m -
Dwr Cymru Welsh Water Mold WwTW Storm Overflow Tributary of Afon Alyn 33 161h 54m -
Dwr Cymru Welsh Water Greenfield Road Holywell Storm Overflow Greenfield Valley "Holywell" stream 42 131h 13m -
Dwr Cymru Welsh Water Abbey Road Storm Overflow River Dee 33 98h 3m -
Dwr Cymru Welsh Water A549 Mold Storm Overflow Tributary of the Afon Alyn 31 94h 53m -
Dwr Cymru Welsh Water Llanasa WwTW Storm Overflow Unnamed Watercourse 11 88h 15m -
Dwr Cymru Welsh Water Llanfair Dyffryn Clwyd WwTW Storm Overflow Dwr Ial 25 86h 59m -
Dwr Cymru Welsh Water Chambers Lane Mercia Drive Junction Storm Overflow No2 Tributary of Afon Alyn 34 84h 25m -
Dwr Cymru Welsh Water Gladstone Street Glanrafon Road Storm Overflow Unnamed Tributary of the River Alyn 23 84h 24m -
Dwr Cymru Welsh Water Llanerch-Y-Mor A548 Storm Overflow Llanerchymor Gutter 19 83h 47m -
Dwr Cymru Welsh Water Mercia Drive Mold Storm Overflow Surface Water Sewer 26 81h 43m -
Dwr Cymru Welsh Water Chambers Lane Mercia Drive Junction Storm Overflow Tributary of Afon Alun 27 78h 2m -
Dwr Cymru Welsh Water Wats Duke Avenue Storm Overflow Tributary of Afon Alyn 18 77h 9m -
Dwr Cymru Welsh Water Gwydelwern Storm Overflow Afon Camddwr 6 77h -
Dwr Cymru Welsh Water Llanarmon Yn Ial WwTW Overflow River Alyn 38 74h 41m -
Dwr Cymru Welsh Water Nannerch Storm Overflow Tributary of River Wheeler 8 62h 45m -
Dwr Cymru Welsh Water Brynford Crooked Horn Overflow Tributary of Afon Chwiler 13 60h 58m -
Dwr Cymru Welsh Water Northop WwTW Settled Storm Overflow Northop Brook 12 59h 15m -
Dwr Cymru Welsh Water Talacre Road Storm Overflow Maescoed Drains 10 59h -
Dwr Cymru Welsh Water Bridge Street No 2 Storm Overflow River Dee 31 54h 19m -
Dwr Cymru Welsh Water Dyserth WwTW Inlet Overflow Glanfyddion Stream 12 52h 13m -
Dwr Cymru Welsh Water Llanasa Headworks Storm Overflow Prestatyn Gutter 8 43h 15m -
Dwr Cymru Welsh Water Dyserth WwTW Storm Overflow Afon Glanffyddion 11 42h 57m -
Dwr Cymru Welsh Water Pen Y Maes Road Holywell Storm Overflow Unnamed Tributary of the Dee Estuary 43 38h 46m -
Dwr Cymru Welsh Water Llangollen West Street Storm Overflow River Dee 7 35h 25m -
Dwr Cymru Welsh Water Llanferres Storm Overflow Tributary of Afon Alun 5 35h 17m -
Dwr Cymru Welsh Water Ffordd Penrhwylfa Meliden Storm Overflow Prestatyn Gutter 8 34h 11m -
Dwr Cymru Welsh Water Bryn Awelon Mold Storm Overflow Tributary of Black Brook 7 33h 32m -
Dwr Cymru Welsh Water Corwen Road Junction Pontblyddyn Storm Overflow River Alyn 6 31h 29m -
Dwr Cymru Welsh Water Near Bagillt Road Greenfield Storm Overflow River Dee 3 29h 14m -
Dwr Cymru Welsh Water Greenfield Knitmesh Overflow Afon Marsiandwr 10 29h 7m -
Dwr Cymru Welsh Water Fford Ddyfrdwy Maes Pennant B Storm Overflow Drain Tributary of the Dee Estuary 4 25h 5m -
Dwr Cymru Welsh Water Fairfield Avenue Ffynnongroew Overflow Ffynnongroew Drain 3 20h 15m -
Dwr Cymru Welsh Water Greenfield Terminal Overflow Holywell Stream 12 18h 57m -
Dwr Cymru Welsh Water Morfa Camp Overflow New Drain Talacre 6 16h 17m -
Dwr Cymru Welsh Water Village Road Northop Hall Storm Overflow Wepre Brook 8 15h 39m -
Dwr Cymru Welsh Water Milford Street and Bro Alun Mold Overflow River Alyn 7 15h 36m -
Dwr Cymru Welsh Water Off Church Terrace Llandegla Storm Overflow River Alyn 6 14h 14m -
Dwr Cymru Welsh Water Nant Y Coed Pen Y Maes Overflow Unnamed Triutary of the River Dee 9 12h 54m -
Dwr Cymru Welsh Water Meliden Road Prestatyn Storm Overflow Prestatyn Gutter 13 12h 54m -
Dwr Cymru Welsh Water Pentre Halkyn Overflow Unnamed Tributary of Nant-Y-Flint 6 12h 25m -
Dwr Cymru Welsh Water Greenfield WwTW Storm Overflow Estuarial Waters of the River Dee 5 10h 30m -
Dwr Cymru Welsh Water Gas Lane Mold Storm Overflow Unnamed Tributary of Afon Alyn 9 8h 54m -
Dwr Cymru Welsh Water Bromfield Lane Mold Storm Overflow Tributary of Afon Alyn 9 8h 1m -
Dwr Cymru Welsh Water Leeswood Bethania Storm Overflow Nant Brook 4 7h 15m -
Dwr Cymru Welsh Water Victoria Road Prestatyn Storm Overflow Prestatyn Gutter 3 6h 15m -
Dwr Cymru Welsh Water Pontblyddyn Dingle Road Storm Overflow River Alyn 1 6h 15m -
Dwr Cymru Welsh Water Fford Ddyfrdwy Maes Pennant A Storm Overflow Tributary of the Dee Estuary 14 5h 4m -
Dwr Cymru Welsh Water Victoria Terrace Mold Storm Overflow River Alyn 2 4h 42m -
Dwr Cymru Welsh Water Prestatyn The Mall Storm Overflow Prestatyn Gutter 2 4h 30m -
Dwr Cymru Welsh Water Southwest of York Close Prestatyn Overflow Rhyl Cut 2 4h -
Dwr Cymru Welsh Water Bastion Road Prestatyn Overflow Prestatyn Gutter 3 2h 44m -
Dwr Cymru Welsh Water The Boulevard Prestatyn Storm Overflow Ditch discharging to Prestatyn Gutter 4 2h 23m -
Dwr Cymru Welsh Water Bridge Street Storm Overflow No1 River Dee 2 1h 55m -
Dwr Cymru Welsh Water Berwyn Street Storm Overflow River Dee via surface water sewer 2 1h 45m -
Dwr Cymru Welsh Water Llangollen East Street Storm Overflow River Dee 4 1h 15m -
Dwr Cymru Welsh Water Llangollen Church Street Storm Overflow River Dee 1 1h 14m -
Dwr Cymru Welsh Water A548 Road Bridge Storm Overflow Greenfield Valley "Holywell" stream 3 1h 12m -
Dwr Cymru Welsh Water Mostyn Coast Road Overflow Tributary of the River Dee 1 0h 58m -
Dwr Cymru Welsh Water Wared Drive Northhop Hall Storm Overflow Surface Water 2 0h 57m -
Dwr Cymru Welsh Water Fford Argoed Fields Storm Overflow River Alyn 2 0h 30m -
Dwr Cymru Welsh Water Talacre Argoed Station Road Overflow Gutter Fawr 1 0h 15m -
Dwr Cymru Welsh Water Mostyn Docks Overflow Tributary of the River Dee 1 0h 15m -
Dwr Cymru Welsh Water Ysceifiog Storm Overflow Tributary of Afon Chwiler 1 0h 15m -
Dwr Cymru Welsh Water Maes Y Dre Mold Storm Overflow River Alyn 1 0h 15m -
Dwr Cymru Welsh Water Glanyrafon Terrace Storm Overflow Afon y Garth 0 0h -
Dwr Cymru Welsh Water Unknown Unknown 0 0h -
Dwr Cymru Welsh Water Gwespyr Storm Overflow Unnamed stream 0 0h -
Dwr Cymru Welsh Water Bryn Coch Lane Mold Storm Overflow Unnamed Tributary of Afon Alyn 0 0h -
Dwr Cymru Welsh Water Llygain-Y-Wern Pentre Halkyn Storm Overflow Tributary of Nan Y Flint 0 0h -
Dwr Cymru Welsh Water Llangollen Riverside Park Storm Overflow River Dee 0 0h -
Dwr Cymru Welsh Water Ffynnongroew Tan Lan Bach Storm Overflow Tan Lan Drains 0 0h -
Dwr Cymru Welsh Water Ffordd Parc Bodnant Prestatyn Overflow Railway Ditch 0 0h -
Dwr Cymru Welsh Water Junction of B5121 and A548 Greenfield Storm Overflow Unnamed Stream 0 0h -
Dwr Cymru Welsh Water Park Avenue Storm Overflow River Dee 0 0h -
Dwr Cymru Welsh Water Picton Road Pen Y Ffordd Storm Overflow Unnamed stream 0 0h -
Dwr Cymru Welsh Water Llangollen Victoria Prom Storm Overflow River Dee 0 0h -
Dwr Cymru Welsh Water Mostyn Coastal Road Storm Overflow Tributary of the Dee estuary 0 0h -
Dwr Cymru Welsh Water Unknown Unknown 0 0h -
Dwr Cymru Welsh Water Llandyrnog WwTW Storm Overflow River Clwyd 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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