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Polluted by sewage 4,055 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 Henley and Thame, 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 | Little Milton STW | Gainsbridge Brook | 54 | 1,165 h 15m | 48.54 |
| Thames Water | Wheatley STW | Wheatley Ditch | 53 | 784 h 45m | 32.67 |
| Thames Water | Benson STW | Howbery Ditch | 18 | 361 h 2m | 15.04 |
| Thames Water | Wheatley STW | Wheatley Ditch | 28 | 326 h | 13.58 |
| Thames Water | Thame STW | Lashlake Stream | 22 | 325 h 30m | 13.54 |
| Thames Water | Chalgrove STW | Warpsgrave Ditch | 15 | 239 h 15m | 9.96 |
| Thames Water | Little Milton STW | Gainsbridge Brook | 11 | 146 h 45m | 6.08 |
| Thames Water | Chinnor STW | Henton Stream | 30 | 142 h | 5.92 |
| Thames Water | Thame STW | Lashlake Stream | 10 | 135 h 30m | 5.62 |
| Thames Water | Watlington STW | Pyrton Stream | 28 | 128 h 15m | 5.33 |
| Thames Water | Dorchester STW | Thame | 12 | 116 h 59m | 4.83 |
| Thames Water | Friday Street (Henley) SPS | Thames | 6 | 46 h 8m | 1.92 |
| Thames Water | Chalgrove STW | Warpsgrave Ditch | 6 | 39 h 30m | 1.62 |
| Thames Water | Tetsworth STW | Latchford Brook | 5 | 34 h 30m | 1.42 |
| Thames Water | Chinnor STW | Henton Stream | 6 | 26 h 10m | 1.08 |
| Thames Water | Beckley STW | Otmoor Lane Ditch | 3 | 19 h | 0.79 |
| Thames Water | Tetsworth STW | Latchford Brook | 2 | 8 h 15m | 0.33 |
| Thames Water | Beckley STW | Otmoor Lane Ditch | 1 | 5 h | 0.21 |
| Thames Water | Forest Hill STW | Polecat End Ditch | 2 | 3 h 30m | 0.12 |
| Thames Water | Sonning Common STW | Into Land | 1 | 1 h 30m | 0.04 |
| Thames Water | Friday Street (Henley) SPS | Thames | 1 | 0 h 56m | 0 |
| Thames Water | Watlington STW | Pyrton Stream | 0 | 0 h | 0 |
| Thames Water | Caversham (Reading) SPS | Thames | 0 | 0 h | 0 |
| Thames Water | Manor Farm Road (Sydenham) SPS | Sydenham Stream | 0 | 0 h | 0 |
| Thames Water | Forest Hill STW | Polecat End Ditch | 0 | 0 h | 0 |
| Thames Water | Benson STW | Howbery Ditch | 0 | 0 h | 0 |
| Thames Water | Dorchester STW | Thame | 0 | 0 h | 0 |
| Thames Water | Sonning Common STW | Into Land | 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