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Polluted by sewage 3,681 hours in 2025
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We get information about overflowing CSOs since January 2025. Here is a chart of the last three months of data for North East Hampshire, here you can see overflows in red, the darker the red, the more the CSO overflowed that day.
Each CSO has a row, the most recent data is on the right hand side.
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Donate Now| Company | Site Name | Receiving Waterway | Overflow Days | Total Duration (hours) | Total Duration (days) |
|---|---|---|---|---|---|
| Thames Water | Crondall STW | River Hart | 56 | 836 h 15m | 34.83 |
| Thames Water | Silchester STW | Silchester Brook | 30 | 547 h 30m | 22.79 |
| Thames Water | Fleet STW | Fleet Brook | 39 | 530 h 30m | 22.08 |
| Thames Water | Sherfield-on-Loddon STW | Bow Brook | 22 | 375 h 15m | 15.62 |
| Thames Water | Basingstoke STW | River Loddon | 37 | 371 h 15m | 15.46 |
| Thames Water | New Mill STW | River Blackwater | 25 | 313 h | 13.04 |
| Thames Water | Hartley Wintney STW | River Hart | 15 | 255 h 30m | 10.62 |
| Thames Water | Silchester STW | Silchester Brook | 12 | 213 h | 8.88 |
| Thames Water | Wedmans Lane (Rotherwick) SPS | Rotherwick Brook | 8 | 71 h 28m | 2.96 |
| Thames Water | Hartley Wintney STW | River Hart | 4 | 46 h 15m | 1.92 |
| Thames Water | Fleet STW | Fleet Brook | 5 | 43 h | 1.79 |
| Thames Water | Sherfield-on-Loddon STW | Bow Brook | 4 | 27 h 45m | 1.12 |
| Thames Water | New Mill STW | River Blackwater | 2 | 14 h 15m | 0.58 |
| Thames Water | Crooked Billet (Hook) SPS & Storm SPS | River Whitewater | 4 | 9 h 36m | 0.38 |
| Thames Water | Basingstoke STW | River Loddon | 2 | 8 h 15m | 0.33 |
| Thames Water | Elvetham Road (Fleet) SPS | Basingstoke Canal | 6 | 8 h 15m | 0.33 |
| Thames Water | Crooked Billet (Hook) SPS & Storm SPS | River Whitewater | 1 | 4 h 6m | 0.17 |
| Thames Water | Wedmans Lane (Rotherwick) SPS | Rotherwick Brook | 1 | 2 h 46m | 0.08 |
| Thames Water | Crondall STW | River Hart | 1 | 2 h | 0.08 |
| Thames Water | Elvetham Road (Fleet) SPS | Basingstoke Canal | 1 | 0 h 45m | 0 |
| Thames Water | Water End (Newnham) SPS | Lyde River | 1 | 0 h 45m | 0 |
| Thames Water | Water End (Newnham) SPS | Lyde River | 0 | 0 h | 0 |
| Thames Water | Avondale Road (Fleet) SPS | Fleet Brook | 0 | 0 h | 0 |
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