Henley was polluted by sewage 975 times in 2023
lasting 13,016 hours - that's 1.51 years!
- but monitoring was disabled in some locations, so could be more

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Contains OS Data © Crown copyright & database right 2021-2023
© Top of the Poops 2021-2023
✔ means we have experimental daily data since 2023
Totals for Henley in 2023
22 Sites polluted by Thames Water
975 sewage dumps
13,016 h duration
That's 1.51 years! On average 2.7 times a day
Change Over Time
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Daily Data Since 2023
     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 2023

Here are all the reported sewage overflow totals for Henley in 2023. 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 3 of the total 28 CSO locations had reporting enabled for less than half the year, of which 3 had zero reporting.

Company Waterway Site Sewage Dumps Duration (Hours) Reporting %
Thames Water Warpsgrave Ditch CHALGROVE STW, CHALGROVE, OXON 132 2,201 99.8
Thames Water Wheatley Ditch WHEATLEY STW, WHEATLEY, OXON 124 2,077 99.8
Thames Water Bletchingdon Brook BLETCHINGDON WWTW 120 1,554 99.1
Thames Water Gainsbridge Brook LITTLE MILTON WWTW 68 1,258 97.8
Thames Water Oxon River Ray ISLIP STW, ISLIP, OXON 70 1,202 100
Thames Water Gallos Brook WESTON-ON-THE-GREEN WWTW 63 1,065 98.1
Thames Water Oxon Ray CHARLTON-ON-OTMOOR WWTW 77 792 98.1
Thames Water Danes Brook HORTON-CUM-STUDLEY WWTW 55 670 99.8
Thames Water Henton Stream CHINNOR STW, CHINNOR, OXON 89 558 99.5
Thames Water Clifton Hampden Ditch CULHAM WASTEWATER TREATMENT WORKS 32 509 99.7
Thames Water Lashlake Stream THAME WASTEWATER TREATMENT WORKS 38 438 99.8
Thames Water Latchford Brook TETSWORTH WWTW 36 305 94
Thames Water Howbery Ditch BENSON STW, HENLEY ROAD, BENSON, OX 12 164 99.6
Thames Water Otmoor Lane Ditch CONSTABLE'S PIECE WWTW 22 141 81.6
Thames Water Pyrton Stream Watlington 8 17 99.9
Thames Water Thames Littlemore Low Level 5 17 99.5
Thames Water Thame DORCHESTER WWTW 4 17 99.5
Thames Water Thames Friday Street, Henley 14 11 87.8
Thames Water Polecat End Ditch Forest Hill 3 6 99.9
Thames Water Into Land Sonning Common 1 4 99.3
Thames Water Fawley Court Stream HENLEY WASTEWATER TREATMENT WORKS 1 3 99.3
Thames Water Sydenham Stream Manor Farm 1 1 99.6
Thames Water Thames Reading, Caversham 0 0 98.7
Thames Water Cherwell Woodeaton STW Pumping Station 0 0 0
Thames Water Stanton Stream Stanton St. John STW Pumping Statio 0 0 0
Thames Water River Thames GORING WASTEWATER TREATMENT WORKS 0 0 98.9
Thames Water Gallos Brook Weston-on-the-green STW Pumping Sta 0 0 93.2
Thames Water Moorbridge Brook Stanton St John 0 0 0

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.