Guildford was polluted by sewage 130 times in 2024
lasting 1,188 hours

© OpenStreetMap contributors
Contains OS Data © Crown copyright & database right 2021-2024
© Top of the Poops 2021-2024
Select the constituency from the drop-down
✔ means we have experimental daily data since 2023
Live data for Guildford in 2025
So far this year (as of Apr 16, 2025, 6:00 PM) there has been 543 hours of sewage overflows
Totals for Guildford in 2024
5 Sites polluted by Thames Water
130 sewage dumps
1,188 h duration
That's 1.65 months. 2.5 times a week, on average
Change Over Time
Take Action
Your local MP is Zöe Franklin (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 Guildford, 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 Guildford 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 5 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 Wey GUILDFORD STW 46 554 97.1
Thames Water River Wey/Ockham Mill Stream RIPLEY WASTEWATER TREATMENT WORKS 43 380 99.6
Thames Water Blackwater SWS, SOUTH LANE, ASH, SURREY 36 244 99.4
Thames Water Culverted Ockham Brook OCKHAM ROAD SOUTH CSO 4 9 100
Thames Water River Wey CSO AT MARKENFIELD ROAD 1 0 99.7

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.