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Polluted by sewage 4,315 hours in 2025 , monitoring offline 850 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 |
|---|---|---|---|---|---|
| Thames Water | Princes Risborough STW | Horsenden Stream | 33 | 520 h 45m | - |
| Thames Water | Stone STW | Scotsgrove Brook | 31 | 458 h 30m | - |
| Anglian Water | TWYFORD-SCHOOL LANE TPS | Padbury Brook | 19 | 403 h 4m | - |
| Thames Water | Ludgershall STW | Ludgershall Brook | 30 | 321 h | - |
| Thames Water | Ludgershall STW | Ludgershall Brook | 20 | 295 h 30m | - |
| Thames Water | Haddenham STW | Scotsgrove Brook | 20 | 293 h | - |
| Thames Water | Haddenham STW | Scotsgrove Brook | 21 | 283 h 45m | - |
| Thames Water | Worminghall STW | Worminghallbrook | 20 | 247 h 15m | - |
| Thames Water | Shabbington STW | Shabbington Brook | 21 | 236 h 45m | - |
| Thames Water | Grendon Underwood STW | Oxon Ray | 20 | 221 h 30m | - |
| Thames Water | Waddesdon STW | Fleet Marston Brook | 19 | 214 h 45m | - |
| Thames Water | Stone STW | Scotsgrove Brook | 12 | 190 h 45m | - |
| Thames Water | Marsh Gibbon STW | Summerstown Ditch | 16 | 169 h | - |
| Thames Water | Shabbington STW | Shabbington Brook | 8 | 95 h 45m | - |
| Thames Water | Grendon Underwood STW | Oxon Ray | 12 | 84 h | - |
| Thames Water | Waddesdon STW | Fleet Marston Brook | 7 | 66 h 15m | - |
| Thames Water | Princes Risborough STW | Horsenden Stream | 3 | 45 h 30m | - |
| Thames Water | Marsh Gibbon STW | Summerstown Ditch | 4 | 39 h | - |
| Thames Water | Worminghall STW | Worminghallbrook | 6 | 38 h 15m | - |
| Thames Water | Dorton STW | Dorton Brook | 6 | 34 h | 850 h |
| Anglian Water | TWYFORD-SCHOOL LANE TPS | Padbury Brook | 8 | 26 h 27m | - |
| Thames Water | Cuddington STW | River Thame | 4 | 17 h 30m | - |
| Thames Water | Cuddington STW | River Thame | 2 | 9 h | - |
| Thames Water | Dorton STW | Dorton Brook | 7 | 4 h 30m | - |
| Anglian Water | POUNDON STW | Poundon Brook | 0 | 0 h | - |
| Anglian Water | POUNDON STW | Poundon Brook | 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