Alyn and Deeside was polluted by sewage 1,543 times in 2024
lasting 7,439 hours
- but monitoring was disabled in some locations, so could be more

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Contains OS Data © Crown copyright & database right 2021-2024
© Top of the Poops 2021-2024
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✔ means we have experimental daily data since 2023
Totals for Alyn and Deeside in 2024
46 Sites polluted by Dwr Cymru Welsh Water
1,543 sewage dumps
7,439 h duration
That's 10.33 months. On average 4.2 times a day
Change Over Time
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Pollution Summary 2024

Here are all the reported sewage overflow totals for Alyn and Deeside in 2024. Sometimes sewage can be being dumped for months at a time.

Reporting refers to how much of the time the monitoring was active. In this constituency 2 of the total 54 CSO locations had reporting enabled for less than half the year, of which 2 had zero reporting.

Company Waterway Site Sewage Dumps Duration (Hours) Reporting %
Dwr Cymru Welsh Water Foundry Drain PADESWOOD ROAD STORM TANK CSO 91 985 99.9
Dwr Cymru Welsh Water Higher Ferry Drain BRETTON PS 83 912 99.9
Dwr Cymru Welsh Water Black Brook, Brad Brook Penyffordd Terminal SPS 77 598 99.9
Dwr Cymru Welsh Water River Dee Ashgrove PS Shotton 87 442 99.9
Dwr Cymru Welsh Water Manor Drain GARDEN CITY BRITISH LEGION - CSO 59 393 99.9
Dwr Cymru Welsh Water Broughton Brook Dobshill SPS 26 344 99.9
Dwr Cymru Welsh Water River Dee Estuary Settled Storm Sewage at Flint WwTW 51 307 99.9
Dwr Cymru Welsh Water Balderton Brook SANDY LANE SPS CELYN CRESCENT SALTN 108 305 98
Dwr Cymru Welsh Water Un-Named Of Broughton Br Lower Farm CSO, Drury 92 303 98.3
Dwr Cymru Welsh Water Queensferry Ditch MANCOT LANE CSO 38 302 99.9
Dwr Cymru Welsh Water Broughton Brook HAWARDEN WOOD LANE CSO 63 241 99.9
Dwr Cymru Welsh Water River Dee Higher Kinnerton SPS 39 234 99.8
Dwr Cymru Welsh Water Unnamed W/C FLINT IN GARDEN 102 MAES GWYN 80 181 89.2
Dwr Cymru Welsh Water Un-Named Watercourse QUEENSFERRY STW (SETTLED STORM) 30 178 100
Dwr Cymru Welsh Water Pentre Ffwrdan Stream Flint Mountain SPS 18 149 99.9
Dwr Cymru Welsh Water Un-Named Of Byr Brook Treuddyn Wastewater Treatment Works 39 146 99.9
Dwr Cymru Welsh Water Golftyn Brook Connahs Quay Golftyn PS CSO/Storm 38 141 98.6
Dwr Cymru Welsh Water Pandy Brook,Tidal Dee FLINT WWTW 16 140 100
Dwr Cymru Welsh Water River Alyn CAERGWRLE - RHYDDYN HILL ROAD CSO 49 128 99.9
Dwr Cymru Welsh Water Dee Estuary BAGILLT WEST SPS BAGILLT 45 128 99.9
Dwr Cymru Welsh Water Black Brook TY GWYN WWTW BUCKLEY 33 99 76
Dwr Cymru Welsh Water Alyn CEFN Y BEDD GWERN ALYN SPS 61 91 98.4
Dwr Cymru Welsh Water Dee Estuary BAGILLT EAST SPS 21 84 98.5
Dwr Cymru Welsh Water River Dee Estuary QUEENSFERRY WWTW 9 72 100
Dwr Cymru Welsh Water Dee FLINT DEE COTTAGES PS 33 72 99.9
Dwr Cymru Welsh Water Byr Brook Pont Y Bodkin Main SPS 17 67 99.9
Dwr Cymru Welsh Water Wepre Brook Connah's Quay Wepre PS 33 65 99.9
Dwr Cymru Welsh Water New Inn Brook BUCKLEY LIVERPOOL ROAD - SSO 27 46 99.9
Dwr Cymru Welsh Water River Cegidog CYMAU PUMPING STATION/CSO 29 40 99.9
Dwr Cymru Welsh Water Alyn HOPE WwTW 6 36 99.9
Dwr Cymru Welsh Water Bretton Drain BRETTON PS 5 31 98.8
Dwr Cymru Welsh Water Alltami Brook BUCKLEY SOUTHDOWN PARK PS 9 27 99.9
Dwr Cymru Welsh Water Sandycroft Drain Factory Road CSO, Sandycroft 6 26 79.6
Dwr Cymru Welsh Water Unnamed Watercourse Flowing To River Dee Cestrian St CSO 14 21 98.9
Dwr Cymru Welsh Water Pentre Ffwrndan Drain Oakenholt Main SPS 5 18 99.9
Dwr Cymru Welsh Water Broughton Brook Sandycroft Phoenix Street CSO 6 17 99.9
Dwr Cymru Welsh Water River Alyn HOPE SARN LANE CSO 36 16 98.3
Dwr Cymru Welsh Water Unnamed W/C BAGILLT STATION ROAD - SSO 12 14 98.3
Dwr Cymru Welsh Water Byr Brook Pont y Bodkin Lower PS 17 11 98.9
Dwr Cymru Welsh Water Unnamed W/C BAGILLT GREENACRE DRIVE - SSO 7 3 66.3
Dwr Cymru Welsh Water River Dee CONNAHS QUAY DEVA AVENUE - CSO 12 3 41.6
Dwr Cymru Welsh Water River Dee Connahs Quay Dock Road PS 3 2 99.8
Dwr Cymru Welsh Water Pentre Drain HAWARDEN CROSS TREE LANE - SSO 5 1 98.9
Dwr Cymru Welsh Water River Cegidog Ffrith SPS 3 1 99.9
Dwr Cymru Welsh Water Pulford Brook Powys Caer Estyn PS 4 1 99.8
Dwr Cymru Welsh Water Unnamed Watercourse Bagillt verge off Manor Drive CSO 1 0 98.6
Dwr Cymru Welsh Water Balderton Brook Saltney Bridge Street CSO 0 0 98.5
Dwr Cymru Welsh Water Alyn CAERGWRLE DERBY ROAD - SSO 0 0 0
Dwr Cymru Welsh Water Black Brook Via Surface Water Drain Pen Y Ffordd West View SPS 0 0 99.8
Dwr Cymru Welsh Water Wepre Brook Buckley (The Willows) SPS 0 0 97.8
Dwr Cymru Welsh Water River Dee Connahs Quay Linden Avenue - CSO 0 0 0
Dwr Cymru Welsh Water Unnamed W/C BAGILLT TYDDYN MESHAM LANE - SSO 0 0 20.9
Dwr Cymru Welsh Water Unnamed Watercourse MERLLYN LANE BAGILLT 0 0 67.4
Dwr Cymru Welsh Water Wepre Brook CONNAHS QUAY LOW LEVEL SPS STORM 0 0 99.8

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. This 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.