Henley and Thame was polluted by sewage 1,093 times in 2024
lasting 16,761 hours - that's 1.94 years!

Constituency

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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 16, 2025, 6:00 PM) there has been 2,789 hours of sewage overflows - that's 0.32 years!

Totals for Henley and Thame in 2024

15 Sites polluted by Thames Water

1,093 sewage dumps
16,761 h duration

That's 1.94 years! On average 3 times a day

Change Over Time

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Constituencies near Henley and Thame

Waterways in Henley and Thame

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

Daily data is experimental and data is not guaranteed to be accurate. Please inform us of any issue, we will fix.

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 0 of the total 16 CSO locations had reporting enabled for less than half the year, of which 0 had zero reporting.

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.

Analysing sewage pollution by the Water Industry

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