Polluted by sewage 2,525 hours in 2025 , monitoring offline 7,396 hours , potential overflows 69 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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| Company | Site Name | Receiving Waterway | Overflow Days | Total Duration (hours) | Offline/Potential Pollution |
|---|---|---|---|---|---|
| Yorkshire Water | NORMANTON/STW | River Calder | 52 | 459 h 36m | - |
| Yorkshire Water | CARLETON/NO 2 STW | River Little Went | 39 | 280 h 48m | - |
| Yorkshire Water | SOWGATE LANE/CSO | Wash Dike | 47 | 220 h 12m | - |
| Yorkshire Water | CARLETON/NO 2 STW | River Little Went | 56 | 196 h 25m | 69 h |
| Yorkshire Water | KNOTTINGLEY MARSH LN/CSO | River Aire | 20 | 177 h 48m | - |
| Yorkshire Water | KNOTTINGLEY MARSH LN/CSO | River Aire | 29 | 148 h 24m | - |
| Yorkshire Water | CASTLEFORD RD/CSO | Wain Dike Beck | 25 | 121 h 14m | - |
| Yorkshire Water | CASTLEFORD ROAD/CSO | Wain Dike Beck | 26 | 115 h 31m | - |
| Yorkshire Water | STATION ROAD ALTOFTS/CSO | Ashfield Beck | 33 | 105 h 16m | - |
| Yorkshire Water | SOWGATE LANE/CSO | Wash Dike | 29 | 93 h 5m | - |
| Yorkshire Water | AIREDALE/STW | River Aire | 39 | 82 h 25m | 180 h |
| Yorkshire Water | KNOTTINGLEY COMMON LN/CSO | Town Dyke | 31 | 81 h 10m | - |
| Yorkshire Water | WHELDON ROAD/CSO | River Aire | 26 | 66 h 58m | 263 h |
| Yorkshire Water | FERRYBRIDGE/CSO | Fryston Beck | 18 | 65 h 45m | - |
| Yorkshire Water | GLASS HOUGHTON/CSO | Carr Beck | 22 | 49 h 38m | - |
| Yorkshire Water | CASTLEFORD/STW | River Aire | 18 | 42 h 36m | - |
| Yorkshire Water | BONDGATE/CSO | Wash Dike | 21 | 41 h 17m | - |
| Yorkshire Water | KNOTTINGLEY A1/CSO | Aire | 18 | 39 h 28m | - |
| Yorkshire Water | FRYSTON/CSO | River Aire | 7 | 26 h 18m | - |
| Yorkshire Water | ALTOFTS CHURCH ROAD/CSO | Choke Churl Beck | 15 | 23 h 47m | - |
| Yorkshire Water | ALL SAINTS CHURCH/CSO | River Aire | 15 | 22 h 57m | - |
| Yorkshire Water | WHITWOOD/CSO | Willowbridge Beck | 5 | 19 h 5m | - |
| Yorkshire Water | AKETON ROAD CUTSYKE/CSO | Carr Beck | 15 | 18 h 34m | - |
| Yorkshire Water | AIREDALE/STW | River Aire | 9 | 14 h 56m | 1,415 h |
| Yorkshire Water | WHELDALE FARM/CSO | River Aire | 9 | 7 h 23m | - |
| Yorkshire Water | JAMES STREET/CSO | River Aire | 7 | 4 h 36m | - |
| Yorkshire Water | Unknown | Unknown | 0 | 0 h | 5,537 h |
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.