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Polluted by sewage 287 times in 2025 lasting 3,796 hours
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Donate NowHere are all the reported sewage overflow totals for Henley and Thame in 2025. Sometimes sewage can be being dumped for months at a time.
Reporting refers to how much of the time the monitoring was active. In this constituency all the declared CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway s appeared to have monitoring enabled for more than 50% of the year
| Company | Waterway | Site | Sewage Dumps | Duration (Hours) | Reporting % |
|---|---|---|---|---|---|
| Thames Water | Gainsbridge Brook | LITTLE MILTON STW, LITTLE MILTON, O | 64 | 1,310 | 98.5 |
| Thames Water | Wheatley Ditch | WHEATLEY STW, WHEATLEY, OXON | 76 | 1,124 | 100 |
| Thames Water | Lashlake Stream | THAME WASTEWATER TREATMENT WORKS | 30 | 460 | 100 |
| Thames Water | Howbery Ditch | BENSON STW, HENLEY ROAD, BENSON, OX | 18 | 361 | 96.7 |
| Thames Water | Henton Stream | CHINNOR STW, CHINNOR, OXON | 29 | 145 | 99.4 |
| Thames Water | Pyrton Stream | Watlington | 30 | 137 | 100 |
| Thames Water | Thame | DORCHESTER WWTW | 15 | 121 | 99.9 |
| Thames Water | Warpsgrave Ditch | CHALGROVE STW, CHALGROVE, OXON | 8 | 56 | 100 |
| Thames Water | Latchford Brook | TETSWORTH STW, TETSWORTH, THAME, OX | 6 | 42 | 100 |
| Thames Water | Otmoor Lane Ditch | CONSTABLE'S PIECE WWTW | 4 | 24 | 100 |
| Thames Water | Thames | Friday Street, Henley | 4 | 9 | 98 |
| Thames Water | Polecat End Ditch | Forest Hill | 3 | 4 | 100 |
| Thames Water | Fawley Court Stream | HENLEY WASTEWATER TREATMENT WORKS | 0 | 0 | 100 |
| Thames Water | Sydenham Stream | Manor Farm | 0 | 0 | 100 |
| Thames Water | Thames | Reading, Caversham | 0 | 0 | 91.3 |
| Thames Water | Into Land | Sonning Common | 0 | 0 | 100 |
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