Runnymede and Weybridge - 2025 Sewage

Polluted by sewage 1,282 hours in 2025 , monitoring offline 5,652 hours

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

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View Annual Sewage Data

You're looking at the totals that we have calculated for sewage in Runnymede and Weybridge for 2025. It is an estimate, based on very poor quality live data from the Water Companies. This may not align with the 'official' reported sewage values from the water companies, which is reported in April following then end of the year - so 2025 numbers are reported in April 2026.

What's a potential overflow? If the CSO goes 'Offline' while its Overflowing, we don't know if it stopped overflowing until we get a 'Stop' event.

Totals for Runnymede and Weybridge in 2025

Sewage1,282 hours
Monitoring offline5,652 hours
Potential pollution0 hours
Storm overflows10

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Daily Data

Jan - 801 hours
Feb - 325 hours
Mar - 30 hours , 152 offline
Apr - 0 hours , 157 offline
May - 0 hours , 538 offline
Jun - 0 hours
Jul - 2 hours , 75 offline
Aug - 20 hours
Sept - 37 hours , 321 offline
Oct - 14 hours , 1,488 offline
Nov - 5 hours , 1,496 offline
Dec - 44 hours , 1,422 offline
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Totals so far

Company Site Name Receiving Waterway Overflow Days Total Duration (hours) Offline/Potential Pollution
Thames Water Chertsey STW Bourne 47 529h 15m 2,622 h
Thames Water Weybridge STW River Wey 29 432h -
Thames Water Cobham Mole 17 236h 30m -
Thames Water Cobham Mole 9 44h 15m -
Thames Water Stoke road, cobham River Mole 6 39h 38m 89 h
Thames Water Dartnell park, byfleet Rive Ditch 1 0h 36m 62 h
Thames Water Chertsey STW Bourne 0 0h 2,329 h
Thames Water Weybridge STW River Wey 0 0h -
Thames Water Stoke road, cobham River Mole 0 0h 547 h
Thames Water Dartnell park, byfleet Rive Ditch 0 0h -

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. Live sewage data from Stream Water API

Annual figures up to and including 2025 come from official water company returns. The 2026 figure is our own estimate, derived continuously from the companies' live data feeds.

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.