Media Queries
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Polluted by sewage 5,805 hours in 2026 , monitoring offline 363 hours 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 | Mortimer STW | Foudry Brook | 51 | 1,151h 15m | - |
| Thames Water | Burghfield STW | Clay Hill Brook | 50 | 1,074h 45m | - |
| Thames Water | Compton STW | River Pang | 36 | 728h 30m | - |
| Thames Water | Chapel Row STW | River Bourne | 41 | 717h | - |
| Thames Water | Pangbourne STW | River Sul | 32 | 707h 42m | - |
| Thames Water | Aldermaston STW | Groundwater Via Land Treatment | 46 | 692h 30m | - |
| Thames Water | Briff Lane (Bucklebury) STW | Briff Lane Stream | 26 | 295h 45m | 363 h |
| Thames Water | Hampstead Norreys STW | River Pang | 17 | 198h 45m | - |
| Thames Water | Beenham STW | Webbs Lane Stream | 17 | 172h 45m | - |
| Thames Water | Midgham STW | Kennet | 10 | 66h 30m | - |
| Thames Water | Hampstead Norreys STW | River Pang | 0 | 0h | - |
| Thames Water | Aldermaston STW | Groundwater Via Land Treatment | 0 | 0h | - |
| Thames Water | Midgham STW | Kennet | 0 | 0h | - |
| Thames Water | Burghfield STW | Clay Hill Brook | 0 | 0h | - |
| Thames Water | Chapel Row STW | River Bourne | 0 | 0h | - |
| Thames Water | Briff Lane (Bucklebury) STW | Briff Lane Stream | 0 | 0h | - |
| Thames Water | Pangbourne STW | River Sul | 0 | 0h | - |
| Thames Water | Compton STW | River Pang | 0 | 0h | - |
| Thames Water | Beenham STW | Webbs Lane Stream | 0 | 0h | - |
| Thames Water | Mortimer STW | Foudry Brook | 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