Winchester

Polluted by sewage 376 times in 2024 lasting 4,931 hours

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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 Winchester in 2025

So far this year (as of Apr 30, 2025, 9:15 AM) there has been 714 hours of sewage overflows

Totals for Winchester in 2024

8 Sites polluted by Southern Water
376 sewage dumps
4,931 hours duration
That's 6.85 months. On average 1 times a day

Change Over Time

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Your local MP is Danny Chambers (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 Winchester, 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 Winchester 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 %
Southern Water River Itchen HARESTOCK WASTEWATER TREATMENT WORK 98 2,041 99.7
Southern Water Ford Lake Via Stream HEATHEN LANE DURLEY CEO 95 1,037 99.7
Southern Water River Hamble BISHOPS WALTHAM WWTW 88 983 93.7
Southern Water River Hamble DURLEY LANE DURLEY CEO 59 590 99.9
Southern Water Groundwaters Via 2 Infilt Syst MORESTEAD WWTW 28 239 99.9
Southern Water Groundwater NEW ALRESFORD WWTW 4 29 99.8
Southern Water Freshwater River GARNIER ROAD 2 7 93.4
Southern Water River Itchen SPRING GARDENS PS 2 2 98.4
Southern Water River Hamble ASHTON CORNER CEO 0 0 92.7

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.