Alyn and Deeside - 2025 Sewage

Polluted by sewage 3,558 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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You're looking at the totals that we have calculated for sewage in Alyn and Deeside 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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Constituencies near Alyn and Deeside

Daily Data

We get information about overflowing CSOs since January 2025. Here is a chart of the last three months of data for Alyn and Deeside, 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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Daily data is experimental and data is not guaranteed to be accurate. Please inform us of any issue, we will fix.
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Totals so far

Company Site Name Receiving Waterway Overflow Days Total Duration (hours) Total Duration (days)
Dwr Cymru Welsh Water Spring Street Connahs Quay Overflow Wepra Brook 216 1,711 h 33m 71.29
Dwr Cymru Welsh Water Padeswood Road Buckley Storm Overflow Foundry Drain 36 272 h 11.33
Dwr Cymru Welsh Water Broughton Mills Road Bretton Storm Overflow Higher Ferry Drain 26 174 h 30m 7.25
Dwr Cymru Welsh Water Shotton Ash Grove Storm Overflow River Dee 41 140 h 45m 5.83
Dwr Cymru Welsh Water Drury Lane Storm Overflow Tributary of Broughton Brook 45 131 h 27m 5.46
Dwr Cymru Welsh Water Penyffordd WwTW Storm Overflow Black Brook 24 111 h 30m 4.62
Dwr Cymru Welsh Water Saltney Sandy Lane Storm Overflow Balderton Brook 19 95 h 55m 3.96
Dwr Cymru Welsh Water Castle Road Flint Overflow River Dee Estuary 38 91 h 30m 3.79
Dwr Cymru Welsh Water Flint WwTW Storm Overflow River Dee Estuary 16 86 h 17m 3.58
Dwr Cymru Welsh Water Maes Gwyn Storm Overflow Surface Water 52 85 h 3.54
Dwr Cymru Welsh Water Buckley Ty Gwyn Storm Overflow Black Brook 9 59 h 38m 2.46
Dwr Cymru Welsh Water Wood Lane Hawarden Storm Overflow Broughton Brook 27 59 h 2.46
Dwr Cymru Welsh Water Dobshill Storm Overflow Unnamed Tributary of Broughton Brook 13 52 h 15m 2.17
Dwr Cymru Welsh Water Mancot Lane Mancot Storm Overflow Queensferry Ditch 11 52 h 2.17
Dwr Cymru Welsh Water Higher Kinnerton Storm Overflow Tributary of the River Dee 10 47 h 45m 1.96
Dwr Cymru Welsh Water Treuddyn WwTW Storm Overflow Byr Brook 13 47 h 23m 1.96
Dwr Cymru Welsh Water East of railway Cefn Y Bedd Storm Overflow River Alyn 22 45 h 36m 1.88
Dwr Cymru Welsh Water Church Street Connahs Quay Storm Overflow Golflyn Brook 14 44 h 30m 1.83
Dwr Cymru Welsh Water Queensferry WwTW Storm Overflow River Dee 8 41 h 45m 1.71
Dwr Cymru Welsh Water Greenacre Drive Bagillt Storm Overflow Ditch 7 32 h 31m 1.33
Dwr Cymru Welsh Water Dee Cottages Storm Overflow River Dee 13 32 h 1.33
Dwr Cymru Welsh Water Bagillt West Storm Overflow Dee Estuary 12 23 h 0.96
Dwr Cymru Welsh Water Station Road Bagillt Storm Overflow Dee Estuary 5 18 h 13m 0.75
Dwr Cymru Welsh Water Rhyddyn Hill Caergwrle Storm Overflow River Alyn 9 17 h 0.71
Dwr Cymru Welsh Water White Farm Road Buckley Overflow Tributary of Wepre Brook 5 12 h 15m 0.5
Dwr Cymru Welsh Water Flint Mountain Storm Overflow Pentre Ffwrdan Stream 7 11 h 45m 0.46
Dwr Cymru Welsh Water Bridge Street Connahs Quay Storm Overflow Wepre Brook 8 10 h 15m 0.42
Dwr Cymru Welsh Water Liverpool Road Buckley Storm Overflow New Inn Brook 8 9 h 30m 0.38
Dwr Cymru Welsh Water Factory Road Sandycroft Storm Overflow Sandycroft Drain 15 9 h 15m 0.38
Dwr Cymru Welsh Water Upper Bryn Road Connahs Quay Storm Overflow River Dee 8 6 h 45m 0.25
Dwr Cymru Welsh Water Welsh Road Roundabout Storm Overflow Manor Drain 4 5 h 30m 0.21
Dwr Cymru Welsh Water Cestrian Street Connah's Quay Storm Overflow River Dee 7 5 h 0.21
Dwr Cymru Welsh Water Hope Cymau Storm Overflow Afon Cegidog 5 4 h 15m 0.17
Dwr Cymru Welsh Water Station Road Bagillt Storm Overflow River Dee 2 3 h 43m 0.12
Dwr Cymru Welsh Water Aberllanerch Drive Storm Overflow Nant Alltami 2 3 h 0.12
Dwr Cymru Welsh Water Kelsterton Road Connah's Quay Storm Overflow Kelsterton Brook 1 1 h 15m 0.04
Dwr Cymru Welsh Water Manor Drive Storm Overflow Unnamed Watercourse 3 0 h 59m 0
Dwr Cymru Welsh Water Pontybodkin Main Storm Overflow Nant Byr 1 0 h 45m 0
Dwr Cymru Welsh Water Sarn Lane Hope Storm Overflow River Alyn 2 0 h 44m 0
Dwr Cymru Welsh Water Merllyn Lane Bagillt Storm Overflow Unnamed Watercourse 1 0 h 15m 0
Dwr Cymru Welsh Water Dock Road Connahs Quay Storm Overflow River Dee 1 0 h 15m 0
Dwr Cymru Welsh Water Bridge Street Saltney Storm Overflow Balderton Brook 0 0 h 0
Dwr Cymru Welsh Water Broughton Mills Road and Chester Road Bretton Storm Overflow Bretton Drain 0 0 h 0
Dwr Cymru Welsh Water The Meadows Flint Overflow Swinchiard Brook 0 0 h 0
Dwr Cymru Welsh Water Hope Street Storm Overflow River Alyn 0 0 h 0
Dwr Cymru Welsh Water Oakenholt Main Storm Overflow Pentre Ffwrdan Stream 0 0 h 0
Dwr Cymru Welsh Water West View Penyffordd Storm Overflow Black Brook 0 0 h 0
Dwr Cymru Welsh Water Pont Y Bodkin Lower Storm Overflow Byr Brook 0 0 h 0
Dwr Cymru Welsh Water North of Evans Street Flint Overflow Swinchiard Brook 0 0 h 0
Dwr Cymru Welsh Water Hope WwTW Storm Overflow River Alyn 0 0 h 0
Dwr Cymru Welsh Water Old London Road Bagillt Storm Overflow Unnamed stream 0 0 h 0
Dwr Cymru Welsh Water Phoenix Street Sandycroft Storm Overflow Broughton Brook 0 0 h 0
Dwr Cymru Welsh Water New Brighton Road Bagillt Overflow Unnamed Watercourse discharging to the River Dee 0 0 h 0
Dwr Cymru Welsh Water Dee Road Connahs Quay Overflow Nant Gwepra 0 0 h 0
Dwr Cymru Welsh Water Near Spring Street Connahs Quay Storm Overflow Wepre Brook 0 0 h 0
Dwr Cymru Welsh Water Linden Avenue Storm Overflow River Dee 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.

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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

Some data reproduced under Open Government Licence

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