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Polluted by sewage 126 times in 2025 lasting 1,138 hours
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Donate NowHere are all the reported sewage overflow totals for Winchester in 2025. 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 CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway s appeared to have monitoring enabled for more than 50% of the year
| Company | Waterway | Site | Sewage Dumps | Duration (Hours) | Reporting % |
|---|---|---|---|---|---|
| Southern Water | Ford Lake Via Stream | HEATHEN LANE DURLEY CEO | 47 | 524 | 99.9 |
| Southern Water | River Hamble | BISHOPS WALTHAM WWTW | 36 | 335 | 99.6 |
| Southern Water | River Hamble | DURLEY LANE DURLEY CEO | 29 | 223 | 99.9 |
| Southern Water | River Itchen | HARESTOCK WASTEWATER TREATMENT WORK | 4 | 31 | 99.6 |
| Southern Water | Groundwaters Via 2 Infilt Syst | MORESTEAD WWTW | 7 | 13 | 100 |
| Southern Water | Freshwater River | GARNIER ROAD | 2 | 6 | 98.8 |
| Southern Water | River Hamble | ASHTON CORNER CEO | 1 | 1 | 99.7 |
| Southern Water | Groundwater | NEW ALRESFORD WWTW | 0 | 0 | 98 |
| Southern Water | River Itchen | SPRING GARDENS PS | 0 | 0 | 100 |
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.
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Get in touch if you have queries or want to discuss our data.
press [at] top-of-the-poops.org