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Polluted by sewage 2,969 hours in 2025 , monitoring offline 338 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 | Selborne STW | Oakhanger Stream | 49 | 842 h 45m | - |
| Southern Water | LISS SSO - 115920 | River Rother | 31 | 629 h 45m | - |
| Southern Water | PETERSFIELD SSO - 115721 | Criddell Stream | 30 | 483 h 34m | - |
| Southern Water | EAST MEON SSO - 115784 | River Meon | 15 | 286 h 23m | - |
| Southern Water | PETERSFIELD SSO - 115721 | Criddell Stream | 16 | 217 h 36m | - |
| Thames Water | Bentley STW | River Wey And Groundwater | 9 | 128 h 30m | 22 h |
| Southern Water | EAST MEON SSO - 115784 | River Meon | 7 | 128 h 12m | - |
| Thames Water | Holybourne (Alton) SPS | River Wey | 6 | 77 h | - |
| Thames Water | Selborne STW | Oakhanger Stream | 7 | 61 h 45m | - |
| Southern Water | LISS SSO - 115920 | River Rother | 8 | 39 h 26m | - |
| Southern Water | BURITON CEO - 116096 | Stanbridge Stream | 2 | 12 h 38m | - |
| Southern Water | STATION ROAD LISS CSO - 108486 | River Rother | 1 | 11 h 6m | - |
| Thames Water | Selbourne SPS | Oakhanger Stream | 1 | 11 h | - |
| Southern Water | BURITON CEO - 116096 | Stanbridge Stream | 1 | 10 h 56m | - |
| Southern Water | CHAPEL STREET PETERSFIELD CSO - 108409 | Unnamed Strm To Tilmore Brook | 1 | 8 h 16m | - |
| Southern Water | COLLEGE STREET PETERSFIELD CSO - 108414 | Unnamed Strm To Tilmore Brook | 1 | 6 h 8m | - |
| Thames Water | Bentley STW | River Wey And Groundwater | 2 | 5 h 45m | - |
| Southern Water | CHAPEL STREET PETERSFIELD CSO - 108409 | Unnamed Strm To Tilmore Brook | 5 | 3 h 7m | - |
| Southern Water | COLLEGE STREET PETERSFIELD CSO - 108414 | Unnamed Strm To Tilmore Brook | 3 | 2 h 56m | - |
| Thames Water | Selbourne SPS | Oakhanger Stream | 2 | 2 h 30m | - |
| Thames Water | Newman Lane (Alton) SPS | Wey | 0 | 0 h | - |
| Thames Water | Newman Lane (Alton) SPS | Wey | 0 | 0 h | 315 h |
| Thames Water | Holybourne (Alton) SPS | River Wey | 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