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Polluted by sewage 3,313 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 West 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 | Kingsclere STW | Kingsclere Brook | 38 | 701 h 15m | 29.21 |
| Southern Water | OVERTON SSO - 115916 | Groundwater | 40 | 543 h 14m | 22.62 |
| Thames Water | West Heath (Charter Alley) SPS | Bow Brook | 29 | 434 h | 18.08 |
| Thames Water | Wash Water STW | Pound Street Brook | 26 | 391 h | 16.29 |
| Thames Water | Wash Water STW | Pound Street Brook | 20 | 312 h 15m | 13 |
| Thames Water | Knights Lane (Ball Hill) SPS | Enbourn | 16 | 258 h | 10.75 |
| Thames Water | Knights Lane (Ball Hill) SPS | Enbourn | 13 | 166 h 45m | 6.92 |
| Thames Water | Kingsclere STW | Kingsclere Brook | 13 | 160 h 45m | 6.67 |
| Thames Water | Blind Mans Gate (Highclere) SPS | Penwood Stream | 14 | 135 h | 5.62 |
| Thames Water | West Heath (Charter Alley) SPS | Bow Brook | 8 | 115 h 15m | 4.79 |
| Thames Water | Blind Mans Gate (Highclere) SPS | Penwood Stream | 6 | 48 h | 2 |
| Southern Water | Unknown | Unknown | 5 | 20 h 56m | 0.83 |
| Southern Water | OVERTON SSO - 115916 | Groundwater | 2 | 12 h 9m | 0.5 |
| Thames Water | St Stephens Hall (Little London) SPS | Bow Brook | 17 | 7 h 8m | 0.29 |
| Thames Water | Swains Road (Tadley) SPS | Silchester Brook | 1 | 5 h 15m | 0.21 |
| Thames Water | St Stephens Hall (Little London) SPS | Bow Brook | 4 | 1 h 20m | 0.04 |
| Thames Water | Swains Road (Tadley) SPS | Silchester Brook | 1 | 1 h | 0.04 |
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