Henley and Thame

Polluted by sewage 1,093 times in 2024 lasting 16,761 hours - That's 1.94 years!

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Contains OS Data © Crown copyright & database right 2021-2024
© Top of the Poops 2021-2024

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✔ means we have experimental daily data since 2023

Live data for Henley and Thame in 2025

So far this year (as of Apr 30, 2025, 9:15 AM) there has been 2,814 hours of sewage overflows - that's 0.33 years!

Totals for Henley and Thame in 2024

15 Sites polluted by Thames Water
1,093 sewage dumps
16,761 hours duration
That's 1.94 years! On average 3 times a day

Change Over Time

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Your local MP is Freddie Van Mierlo (Liberal Democrat) - Find out more about their interests, donors, and voting at They Work For You

Daily Data

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.

Monitoring Online
Monitoring Offline
Polluting
Potentially Polluting
Unknown
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Pollution Summary 2024

Here are all the reported sewage overflow totals for Henley and Thame in 2024. 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 CSOs 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 168 3,544 97.9
Thames Water Wheatley Ditch WHEATLEY STW, WHEATLEY, OXON 160 3,188 83.8
Thames Water Warpsgrave Ditch CHALGROVE STW, CHALGROVE, OXON 147 2,854 98.4
Thames Water Howbery Ditch BENSON STW, HENLEY ROAD, BENSON, OX 101 1,770 99.8
Thames Water Lashlake Stream THAME WASTEWATER TREATMENT WORKS 105 1,608 100
Thames Water Fawley Court Stream HENLEY WASTEWATER TREATMENT WORKS 86 950 100
Thames Water Henton Stream CHINNOR STW, CHINNOR, OXON 105 825 99.7
Thames Water Thame DORCHESTER WWTW 63 791 99.5
Thames Water Pyrton Stream Watlington 90 703 99.7
Thames Water Latchford Brook TETSWORTH STW, TETSWORTH, THAME, OX 30 295 99.9
Thames Water Otmoor Lane Ditch CONSTABLE'S PIECE WWTW 10 90 100
Thames Water Sydenham Stream Manor Farm 4 60 100
Thames Water Thames Friday Street, Henley 17 53 95
Thames Water Polecat End Ditch Forest Hill 5 24 100
Thames Water Into Land Sonning Common 2 2 100
Thames Water Thames Reading, Caversham 0 0 100

Data Sources & Accuracy

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. This 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.