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Polluted by sewage 376 times in 2024 lasting 4,931 hours
So far this year (as of May 30, 2025, 4:00 AM) there has been 714 hours of sewage overflows
Your local MP is Danny Chambers (Liberal Democrat) - Find out more about their interests, donors, and voting at They Work For You
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.
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Donate NowHere 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 |
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.
Get in touch if you have queries or want to discuss our data.
press [at] top-of-the-poops.org