Polluted by sewage 7,891 hours in 2025 , monitoring offline 918 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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Donate Now| Company | Site Name | Receiving Waterway | Overflow Days | Total Duration (hours) | Offline/Potential Pollution |
|---|---|---|---|---|---|
| Thames Water | Standlake STW | Windrush | 66 | 1,501h 45m | - |
| Thames Water | Standlake STW | Windrush | 33 | 736h | - |
| Thames Water | Bampton STW | Shill Brook | 50 | 601h 45m | - |
| Thames Water | Milton-Under-Wychwood STW | Littlestock Brook | 38 | 573h 30m | 119 h |
| Thames Water | Shrivenham STW | Tuckmill Brook | 31 | 568h | - |
| Thames Water | Milton-Under-Wychwood STW | Littlestock Brook | 26 | 518h | - |
| Thames Water | Witney STW | Curbridge Ditch | 32 | 508h 45m | - |
| Thames Water | Stanton Harcourt STW | Harcourt Brook | 24 | 434h 45m | - |
| Thames Water | Shrivenham STW | Tuckmill Brook | 24 | 387h | - |
| Thames Water | Kingston Bagpuize STW | Bagpuize Brook | 26 | 373h 30m | - |
| Thames Water | Stanton Harcourt STW | Harcourt Brook | 18 | 284h 45m | - |
| Thames Water | Bampton STW | Shill Brook | 21 | 244h 45m | - |
| Thames Water | Carterton STW | Shill Brook | 16 | 237h 45m | - |
| Thames Water | Carterton STW | Shill Brook | 10 | 167h 30m | - |
| Thames Water | Burford STW | River Windrush | 9 | 133h 45m | - |
| Thames Water | Appleton STW | Marcham Brook | 14 | 133h | - |
| Thames Water | Faringdon STW | Faringdon Brook | 35 | 119h | 736 h |
| Thames Water | Clanfield STW | Halfacre Brook | 9 | 103h 30m | - |
| Thames Water | Clanfield STW | Halfacre Brook | 5 | 81h 30m | - |
| Thames Water | Witney STW | Curbridge Ditch | 5 | 67h 15m | - |
| Thames Water | XX CSO | N/A | 30 | 29h 50m | 62 h |
| Thames Water | Faringdon STW | Faringdon Brook | 12 | 25h | - |
| Thames Water | Burford STW | River Windrush | 3 | 22h 15m | - |
| Thames Water | Appleton STW | Marcham Brook | 2 | 17h | - |
| Thames Water | XX CSO | N/A | 8 | 11h 46m | - |
| Thames Water | Kingston Bagpuize STW | Bagpuize Brook | 1 | 8h 15m | - |
| Thames Water | Tubney SPS XX | N/A | 1 | 1h 15m | - |
| Thames Water | Tubney SPS XX | N/A | 0 | 0h | - |
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
Annual figures up to and including 2025 come from official water company returns. The 2026 figure is our own estimate, derived continuously from the companies' live data feeds.
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.