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Polluted by sewage 1,272 hours in 2025 , monitoring offline 19,404 hours , potential overflows 5,425 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 | MORRISONS CAR PARK/CSO | River Spen | 45 | 210 h 8m | 662 h |
| Yorkshire Water | ST PEG LANE/NO 2 CSO | River Spen | 36 | 181 h 20m | - |
| Yorkshire Water | RAIKESWOOD DRIVE/CSO | High Royds Beck | 12 | 178 h 29m | 5,284 h |
| Yorkshire Water | HECKMONDWIKE/NO 2 CSO | River Spen | 21 | 167 h 14m | - |
| Yorkshire Water | SPENBOROUGH/SPS | River Calder And River Spen | 26 | 114 h 32m | - |
| Yorkshire Water | LISTING MILL FARM/CSO | River Spen | 34 | 95 h 46m | - |
| Yorkshire Water | MILTON ROAD/CSO | Tbc When Permit Issued | 28 | 84 h 26m | - |
| Yorkshire Water | BIRKENSHAW/NO 4 CSO | Nutter Beck | 10 | 69 h 11m | - |
| Yorkshire Water | EAST BIERLEY/NO 2 CSO | Lodge Beck | 20 | 47 h 25m | - |
| Yorkshire Water | NORTH BIERLEY/CSO | Hunsworth Beck | 11 | 32 h 49m | - |
| Yorkshire Water | HIGH ST HECKMONDWIK/2 CSO | Culverted Spen River | 23 | 24 h 54m | - |
| Yorkshire Water | CHAPEL LANE/NO 2 CSO | River Spen | 17 | 19 h 36m | - |
| Yorkshire Water | HUNSWORTH LANE/NO 2 CSO | Hunsworth Upper Lane Beck | 4 | 17 h 58m | - |
| Yorkshire Water | CLIFF HOLLINS LANE/CSO | Highroyds Beck | 2 | 7 h 37m | 6,789 h |
| Yorkshire Water | OLD LANE/NO 2 CSO | Wormalds Drain | 9 | 7 h 28m | - |
| Yorkshire Water | BIRSTALL/CSO | Smithies Beck | 9 | 7 h 26m | - |
| Yorkshire Water | HIGHTOWN ROAD/NO 2 CSO | Syke Beck | 8 | 3 h 35m | - |
| Yorkshire Water | BATH ROAD/CSO | Tbc When Permit Issued | 7 | 2 h 9m | - |
| Yorkshire Water | BALME ROAD/NO 2 CSO | River Spen | 1 | 0 h 9m | - |
| Yorkshire Water | WHITEHALL ROAD/CSO | River Spen | 1 | 0 h 5m | - |
| Yorkshire Water | BATLEY ROAD/NO 2 CSO | River Spen | 1 | 0 h | 4,325 h |
| Yorkshire Water | NEWGATE/CSO | River Calder | 0 | 0 h | 7,767 h |
| Yorkshire Water | HECK CEMETERY ROAD/2 CSO | Unna. Cul. Of Spen River | 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.
Get in touch if you have queries or want to discuss our data.
press [at] top-of-the-poops.org