Media Queries
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Polluted by sewage 4,941 hours in 2026 so far..
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 | Winterbourne STW | Winterbourne Stream | 107 | 2,337h 45m | - |
| Thames Water | Hamstead Marshall STW | Hamstead Stream | 47 | 952h 15m | - |
| Thames Water | Newbury STW | Kennet | 43 | 792h 33m | - |
| Thames Water | East Shefford STW | River Lambourn | 36 | 516h 45m | - |
| Thames Water | Kintbury STW | Kennet | 22 | 334h 54m | - |
| Thames Water | Chieveley STW | Winterbourne Stream | 2 | 7h | - |
| Thames Water | East Garston SPS | River Lambourn | 1 | 0h 30m | - |
| Thames Water | Winterbourne STW | Winterbourne Stream | 0 | 0h | - |
| Thames Water | Hamstead Marshall STW | Hamstead Stream | 0 | 0h | - |
| Thames Water | Newbury STW | Kennet | 0 | 0h | - |
| Thames Water | East Shefford STW | River Lambourn | 0 | 0h | - |
| Thames Water | East Garston SPS | River Lambourn | 0 | 0h | - |
| Thames Water | Kintbury STW | Kennet | 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
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