Polluted by sewage 2,490 hours in 2025 , monitoring offline 29,708 hours , potential overflows 2,002 hours
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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Donate Now| Company | Site Name | Receiving Waterway | Overflow Days | Total Duration (hours) | Offline/Potential Pollution |
|---|---|---|---|---|---|
| Yorkshire Water | KNOSTROP/H LEVEL STW/3XDWF OVERFLOW | Wyke Beck And River Aire | 64 | 860h 30m | 224 h |
| Yorkshire Water | KNOSTROP/L LEVEL STW/6XDWF OVERFLOW | Wyke Beck And River Aire | 36 | 230h 40m | - |
| Yorkshire Water | WESTBURY PLACE/CSO | Balm Beck | 27 | 182h 23m | 600 h |
| Yorkshire Water | JACK LANE/CSO | Aire And Calder Navigation | 62 | 169h 28m | 479 h |
| Yorkshire Water | WIDE LANE WOODLANDS/2 CSO | Mill Shaw Beck | 43 | 167h 36m | - |
| Yorkshire Water | EASTGATE LEEDS/NO 2 CSO | Lady Beck | 7 | 142h 37m | 1,269 h |
| Yorkshire Water | KNOSTROP/H LEVEL STW/6XDWF OVERFLOW | Wyke Beck And River Aire | 29 | 138h 31m | 90 h |
| Yorkshire Water | BRIGGATE/NO 2 CSO | River Aire | 6 | 116h 2m | - |
| Yorkshire Water | MILLSHAW/NO 2 CSO | Mill Shaw Beck | 32 | 87h 24m | 115 h |
| Yorkshire Water | CARTMELL DRIVE/CSO | Wyke Beck | 27 | 83h 27m | - |
| Yorkshire Water | KNOSTROP/L LEVEL STW/3XDWF OVERFLOW | Wyke Beck And River Aire | 24 | 73h 58m | - |
| Yorkshire Water | ST PAULS STREET/CSO | River Aire | 17 | 39h 15m | 132 h |
| Yorkshire Water | MIDDLETON GROVE/CSO | Aire And Calder Navigation | 32 | 38h 33m | - |
| Yorkshire Water | LOWFIELDS ROAD/CSO | Wortley Beck Culverted | 27 | 36h 36m | - |
| Yorkshire Water | KNOSTROP/COLTON CSO | Wyke Beck | 10 | 32h 7m | - |
| Yorkshire Water | SHANNON STREET/CSO | Lady Beck | 20 | 25h 47m | - |
| Yorkshire Water | WESTLAND ROAD/CSO | Aire And Calder Navigation | 8 | 16h 19m | - |
| Yorkshire Water | OLD RUN ROAD/CSO | Aire And Calder Navigation | 19 | 14h 53m | - |
| Yorkshire Water | WORTLEY VALLEY/CSO | Wortley Beck Pumped Outlet | 10 | 13h 30m | - |
| Yorkshire Water | STOURTON/CSO | Stourton Beck | 6 | 7h 54m | - |
| Yorkshire Water | LUCY AVENUE/CSO | Deane Dike | 6 | 5h 41m | - |
| Yorkshire Water | VICTORIA AVENUE/NO 2 CSO | Wyke Beck | 7 | 2h 45m | - |
| Yorkshire Water | THORPE ROAD/CSO | Throstle Carr Beck | 4 | 1h 51m | - |
| Yorkshire Water | THE WELLINGTON/CSO | Aire And Calder Navigation | 2 | 1h 13m | - |
| Yorkshire Water | SUSSEX AVENUE/CSO | Aire And Calder Navigation | 2 | 0h 58m | - |
| Yorkshire Water | MEADOW ROAD/CSO | Aire And Calder Navigation | 1 | 0h 21m | 2,763 h |
| Yorkshire Water | CITY SQUARE/CSO | River Aire | 0 | 0h | 4,048 h |
| Yorkshire Water | STOCKS HILL/CSO | Hol Beck | 0 | 0h | 8,584 h |
| Yorkshire Water | HALTON DEAN TIP/CSO | Dean Dyke | 0 | 0h | 5,225 h |
| Yorkshire Water | GLOBE ROAD/CSO | Hol Beck | 0 | 0h | 8,176 h |
| Yorkshire Water | WESTBURY GROVE/CSO | Tbc When Permit Issued | 0 | 0h | - |
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.