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River Dee polluted by sewage 1,598 times in 2023 - lasting 8,268 hours

© OpenStreetMap contributors
Contains OS Data © Crown copyright & database right 2021-2023
© Top of the Poops 2021-2023
Totals for River Dee in 2023
46 Sites polluted by Dwr Cymru Welsh Water
1,598 sewage dumps
8,268 h duration
That's 11.48 months. On average 4.4 times a day

Pollution Summary 2023

Here are all the reported sewage overflow totals for River Dee in 2023. Sometimes sewage can be being dumped for months at a time.

These numbers are very slightly different from the Rivers page. We're working on it.

Company Waterway Site Sewage Dumps Duration (Hours) Reporting %
Dwr Cymru Welsh Water River Dee Settled Storm Overflow at Bangor-on-Dee Wastewater Treatment Works 72 859 100
Dwr Cymru Welsh Water River Dee BALA WWTW 80 836 100
Dwr Cymru Welsh Water River Dee LLANGOLLEN WWTW 73 816 99.7
Dwr Cymru Welsh Water River Dee Bala WwTW Storm Tank 55 641 100
Dwr Cymru Welsh Water River Dee CSO at Cynwyd STW 124 570 100
Dwr Cymru Welsh Water River Dee MARSH FARM PUMPING STATION 54 450 98.4
Dwr Cymru Welsh Water River Dee CEFN MAWR WwTW 39 444 99.8
Dwr Cymru Welsh Water River Dee DEE LANE CSO 100 373 100
Dwr Cymru Welsh Water River Dee CHESTER WASTEWATER TREATMENT WORKS 67 354 100
Dwr Cymru Welsh Water River Dee BANGOR ON DEE STW 24 338 99.9
Dwr Cymru Welsh Water River Dee FIVE FORDS STW 35 327 100
Dwr Cymru Welsh Water River Dee Corwen WwTW Settled Storm 29 259 100
Dwr Cymru Welsh Water River Dee Park Avenue CSO 25 214 100
Dwr Cymru Welsh Water River Dee LITTLE ROODEE CSO 57 147 100
Dwr Cymru Welsh Water River Dee CORWEN WWTW FINAL EFFLUENT 9 136 100
Dwr Cymru Welsh Water River Dee Abbey Road CSO 51 134 100
Dwr Cymru Welsh Water River Dee CHESTER WEIR (SOUTH BANK) CSO 58 126 94.1
Dwr Cymru Welsh Water River Dee Ashgrove PS Shotton 51 122 99.9
Dwr Cymru Welsh Water River Dee Corwen Corner Station Yard CSO 19 120 63
Dwr Cymru Welsh Water River Dee Higher Kinnerton SPS 24 111 100
Dwr Cymru Welsh Water River Dee THE GROVES CSO 50 106 99.9
Dwr Cymru Welsh Water River Dee DEVA TERRACE CSO 81 100 98.7
Dwr Cymru Welsh Water River Dee CSO AT CHESTER STW 55 93 100
Dwr Cymru Welsh Water River Dee CRANE STREET CSO 41 84 56.3
Dwr Cymru Welsh Water River Dee Holt PS 19 70 99.9
Dwr Cymru Welsh Water River Dee THE DINGLE CHESTER CSO 94 69 98.7
Dwr Cymru Welsh Water River Dee Chirk O/S 24 Offa St CSO 13 55 99.9
Dwr Cymru Welsh Water River Dee SAUGHALL VILLAGE CSO 21 51 94.3
Dwr Cymru Welsh Water River Dee BOATHOUSE INN CSO 29 51 100
Dwr Cymru Welsh Water River Dee PEN Y MAES PUMPING STATION 23 44 96.1
Dwr Cymru Welsh Water River Dee Rhosymedre Park Rd CSO 15 40 99.6
Dwr Cymru Welsh Water River Dee SANDY LANE COMBINED SEWER OVERFLOW 26 35 100
Dwr Cymru Welsh Water River Dee SALTNEY SEWERAGE CHESTER STREET PS 28 33 99.8
Dwr Cymru Welsh Water River Dee Eyton Grove SPS 6 12 100
Dwr Cymru Welsh Water River Dee EDGAR PARK CSO 9 9 58.5
Dwr Cymru Welsh Water River Dee Connahs Quay Dock Road PS 4 7 97.3
Dwr Cymru Welsh Water River Dee GROSVENOR BRIDGE CSO 5 6 99.9
Dwr Cymru Welsh Water River Dee GAYTON PARKWAY CSO 5 3 100
Dwr Cymru Welsh Water River Dee WEST STREET CSO 9 2 100
Dwr Cymru Welsh Water River Dee CSO at Rear Hamden Way Plas Madoc 4 2 99.8
Dwr Cymru Welsh Water River Dee CHESTER BELGRAVE PARK SPS 2 1 99.9
Dwr Cymru Welsh Water River Dee Royal Hotel CSO 3 1 100
Dwr Cymru Welsh Water River Dee OLD DEE BRIDGE (NORTH BANK) CSO 3 0 100
Dwr Cymru Welsh Water River Dee THE DINGLE COMBINED SEWER OVERFLOW 3 0 79.5
Dwr Cymru Welsh Water River Dee Llangollen Chruch St CSO 2 0 59.6
Dwr Cymru Welsh Water River Dee Newbridge SPS 2 0 100
Dwr Cymru Welsh Water River Dee Connahs Quay Linden Avenue - CSO 0 0 0
Dwr Cymru Welsh Water River Dee CONNAHS QUAY DEVA AVENUE - CSO 0 0 0
Dwr Cymru Welsh Water River Dee REAR OF 22 CURZON PARK NORTH CSO 0 0 100
Dwr Cymru Welsh Water River Dee HANDBRIDGE GREENBANK SPS 0 0 100
Dwr Cymru Welsh Water River Dee Llangollen Victoria Prom Riverside CSO 0 0 100
Dwr Cymru Welsh Water River Dee GREENFIELD IND EST NO 1 HOLYWELL 0 0 50.5
Dwr Cymru Welsh Water River Dee Llangollen Riverside Park Printing Works CSO 0 0 90.7
Dwr Cymru Welsh Water River Dee Llangollen East St CSO 0 0 41.7

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.