Polluted by sewage 4,604 hours in 2025 , monitoring offline 11,919 hours , potential overflows 3,960 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 | GRAFTON BRIDGE/CSO | River Don | 93 | 1,272 h 38m | - |
| Yorkshire Water | EASTWOOD IND ESTATE/CSO | River Don | 75 | 336 h 21m | - |
| Yorkshire Water | CRINOLENE HOUSE/CSO | Don Via Surface Water Sewer | 27 | 252 h 31m | 1,097 h |
| Yorkshire Water | SCROOBY STREET/CSO | Greasbrough Dyke | 38 | 209 h 21m | - |
| Yorkshire Water | MIDDLE LANE SOUTH/CSO | Tbc When Permit Issued | 31 | 202 h 7m | 376 h |
| Yorkshire Water | BLACKBURN MEADOWS/STW | River Don | 17 | 172 h 41m | - |
| Yorkshire Water | MASBROUGH STREET/CSO | Holmes Tail Goit | 37 | 168 h 27m | 25 h |
| Yorkshire Water | FITZWILLIAM CENTRE/CSO | River Don | 45 | 152 h 15m | - |
| Yorkshire Water | ALL SAINTS SQUARE/CSO | Varies With Outlet | 41 | 142 h 1m | - |
| Yorkshire Water | UPPER MILLGATE/CSO | Not Matched In Ea Consents Database | 38 | 140 h 25m | 370 h |
| Yorkshire Water | CLIFTON PARK/CSO | River Don | 24 | 125 h 39m | 120 h |
| Yorkshire Water | LONG LANE/STW | River Rother | 16 | 116 h 44m | 299 h |
| Yorkshire Water | BRINSWORTH/CSO | River Rother | 38 | 106 h 11m | - |
| Yorkshire Water | GREASBROUGH/CSO | Ochre Dyke | 36 | 99 h 59m | - |
| Yorkshire Water | ELDERTREE ROAD/NO 2 CSO | Blackburn Brook | 23 | 96 h 39m | - |
| Yorkshire Water | TREETON MILL LANE/CSO | River Rother | 24 | 95 h 47m | 61 h |
| Yorkshire Water | BRINSWORTH STREET/CSO | Holmes Tail Goit | 15 | 91 h 6m | - |
| Yorkshire Water | VALLEY ROAD NORTH/CSO | Herringthorpe Beck | 27 | 85 h 45m | - |
| Yorkshire Water | CLAREMONT ST ROTHERHM/CSO | Holmes Tail Goit | 5 | 82 h 44m | 1,452 h |
| Yorkshire Water | DALTON BROOK/CSO | Dalton Brook | 14 | 75 h 37m | - |
| Yorkshire Water | THORPE HESLEY/CSO | Thorpe Dyke | 31 | 73 h 53m | - |
| Yorkshire Water | AUGHTON/CSO | Ulley Brook | 16 | 71 h 50m | - |
| Yorkshire Water | TREETON/CSO | River Rother | 10 | 64 h 44m | - |
| Yorkshire Water | WATER LANE ROTHERHAM/CSO | River Don | 7 | 54 h 45m | 3,770 h |
| Yorkshire Water | TREETON LANE/CSO | River Rother | 9 | 42 h 59m | 60 h |
| Yorkshire Water | DROPPINGWELL ROAD/CSO | Oakley Bottom Dike | 22 | 39 h 43m | - |
| Yorkshire Water | FOSTERS GARAGE/CSO | River Don | 8 | 39 h 30m | - |
| Yorkshire Water | UNION STREET/CSO | River Mas Culverted | 21 | 31 h 58m | - |
| Yorkshire Water | WHITEHILL LANE/CSO | River Rother | 6 | 24 h 54m | - |
| Yorkshire Water | RAWMARSH ROAD/CSO | River Don | 8 | 23 h 13m | - |
| Yorkshire Water | CLIFTON LORD STREET/CSO | Herringthorpe Beck | 11 | 19 h 43m | - |
| Yorkshire Water | VALLEY ROAD SOUTH/CSO | Herringthorpe Beck | 12 | 19 h 37m | - |
| Yorkshire Water | RETFORD RD ORGREAVE/2 CSO | Orgreave Common Drain | 15 | 17 h 52m | - |
| Yorkshire Water | PSALTERS LANE HOLMES/CSO | Varies With Outlet | 2 | 13 h 39m | 233 h |
| Yorkshire Water | JORDAN/CSO | Holmes Goit | 11 | 12 h 50m | - |
| Yorkshire Water | HESLEY LANE/CSO | Thorpe Dyke | 5 | 11 h 15m | - |
| Yorkshire Water | BLACKBURN/CSO | Blackburn Brook | 4 | 9 h 25m | - |
| Yorkshire Water | CANKLOW/CSO | River Rother | 6 | 7 h 35m | - |
| Yorkshire Water | THE MALTINGS/CSO | River Rother | 0 | 0 h | - |
| Yorkshire Water | HIGHFIELD LN ORGREAVE/CSO | Handsworth Beck | 0 | 0 h | - |
| Yorkshire Water | MARSH STREET/CSO | River Don | 0 | 0 h | - |
| Yorkshire Water | DALTON PARVA/CSO | Dalton Brook | 0 | 0 h | 5,225 h |
| Yorkshire Water | BRADGATE LANE/NO 2 CSO | River Moss | 0 | 0 h | 2,787 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.