Polluted by sewage 4,347 hours in 2025 , monitoring offline 23,997 hours , potential overflows 1,241 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 | HEBBLE LANE/CSO | Hebble Brook | 92 | 847 h 6m | - |
| Yorkshire Water | HALIFAX COPLEY/STW | River Calder And Hebble Brook | 63 | 615 h 41m | - |
| Yorkshire Water | NEW INN WEST STREET/CSO | River Ryburn | 66 | 440 h 34m | - |
| Yorkshire Water | DARK LANE/NO 2 CSO | River Calder | 57 | 416 h 31m | 1,524 h |
| Yorkshire Water | SALTERHEBBLE/STW/6XDWF OVERFLOW | River Calder And Hebble Brook | 87 | 380 h 52m | - |
| Yorkshire Water | SALTERHEBBLE/STW/3XDWF OVERFLOW | River Calder And Hebble Brook | 45 | 219 h 46m | - |
| Yorkshire Water | WEST STREET/CSO | River Ryburn | 72 | 210 h 54m | - |
| Yorkshire Water | HIGH ROYD TOWPATH/CSO | River Calder | 30 | 179 h 46m | - |
| Yorkshire Water | BACK WHARF STREET/CSO | River Calder | 18 | 161 h 40m | 778 h |
| Yorkshire Water | WOODFALL SHELF EAST/2 CSO | Brow Lane Sewer | 29 | 127 h 52m | 335 h |
| Yorkshire Water | RAGLAN STREET/CSO | Hebble Brook | 60 | 113 h 48m | - |
| Yorkshire Water | WHARFE HOUSE/CSO | River Calder | 52 | 109 h 49m | - |
| Yorkshire Water | HEBBLE BROOK/CSO | Hebble Brook | 33 | 88 h 20m | - |
| Yorkshire Water | LEE LANE/STW | Shibden Beck | 35 | 86 h 6m | - |
| Yorkshire Water | JUMPLES/CSO | Hebble Brook | 36 | 59 h 22m | - |
| Yorkshire Water | SOWERBY NEW ROAD/CSO | River Calder | 45 | 56 h 16m | - |
| Yorkshire Water | WAKEFIELD ROAD 90/CSO | Calder+Hebble Navigation Canal | 29 | 52 h 40m | - |
| Yorkshire Water | DENE PLACE/NO 2 CSO | Hebble Brook | 20 | 36 h 38m | - |
| Yorkshire Water | MOUNT PELLON/CSO | Hebble Brook Culverted | 38 | 35 h | - |
| Yorkshire Water | LUMB CLOUGH/CSO | River Ryburn | 11 | 19 h 41m | 100 h |
| Yorkshire Water | SOWERBY BRIDGE/CSO | River Calder | 8 | 19 h 40m | 40 h |
| Yorkshire Water | DODGEHOLME/CSO | Hebble Brook | 11 | 15 h 18m | - |
| Yorkshire Water | OVENDEN ROAD/CSO | Ovenden Brook | 8 | 12 h 3m | - |
| Yorkshire Water | EDGE END LANE/NO 2 CSO | Blackshaw Beck | 11 | 11 h 40m | 157 h |
| Yorkshire Water | TOWN HALL STREET/CSO | River Calder | 6 | 7 h 17m | - |
| Yorkshire Water | HOLDSWORTH ROAD/NO 2 CSO | Strines Beck | 4 | 6 h 53m | 1,306 h |
| Yorkshire Water | PEAR TREE HOLLINS/CSO | River Calder | 9 | 5 h 18m | 272 h |
| Yorkshire Water | KING STREET/CSO | Hebble Brook | 5 | 3 h 15m | - |
| Yorkshire Water | SEDBURGH ROAD/CSO | Hebble Brook | 2 | 2 h 46m | 0 h |
| Yorkshire Water | BOY LANE/CSO | Hebble Brook | 2 | 1 h 55m | - |
| Yorkshire Water | SHIBDEN PARK/CSO | Red Beck | 2 | 1 h 1m | - |
| Yorkshire Water | LEE BRIDGE/CSO | Ovenden Brook | 1 | 0 h 35m | 5,816 h |
| Yorkshire Water | FARRAR MILL LANE/CSO | Hebble Brook | 1 | 0 h 23m | - |
| Yorkshire Water | ROCHDALE CANAL/CSO | River Calder | 1 | 0 h 15m | - |
| Yorkshire Water | PELLON LANE/CSO | Hebble Brook Culverted | 1 | 0 h 10m | - |
| Yorkshire Water | WATSON MILL LANE/CSO | River Ryburn | 2 | 0 h 9m | 6,303 h |
| Yorkshire Water | LONGBOTTOM BRIDGE/CSO | River Calder | 0 | 0 h | - |
| Yorkshire Water | STANNARY HALIFAX/CSO | Hebble Brook | 0 | 0 h | - |
| Yorkshire Water | SOWERBY CROFT LANE/2 CSO | River Ryburn | 0 | 0 h | - |
| Yorkshire Water | STANSFIELD MILL/CSO | Nether Ends Beck | 0 | 0 h | 6,665 h |
| Yorkshire Water | LUMBROOK/NO 2 CSO | Lumb Brook Culverted | 0 | 0 h | 1,937 h |
| Yorkshire Water | COPLEY VILLAGE/NO 2 SPS | River Calder | 0 | 0 h | - |
| Yorkshire Water | WARLEY CLOUGH/CSO | Warley Clough Dams | 0 | 0 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.