Winchester - 2025 Sewage

Polluted by sewage 949 hours in 2025

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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 Winchester 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 Winchester in 2025

Sewage949 hours
Monitoring offline0 hours
Potential pollution0 hours
Storm overflows20

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Daily Data

Jan - 358 hours
Feb - 349 hours
Mar - 0 hours
Apr - 7 hours
May - 0 hours
Jun - 4 hours
Jul - 1 hours
Aug - 0 hours
Sept - 20 hours
Oct - 16 hours
Nov - 23 hours
Dec - 166 hours
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Totals so far

Company Site Name Receiving Waterway Overflow Days Total Duration (hours) Offline/Potential Pollution
Southern Water HEATHEN LANE DURLEY CEO - 108836 Ford Lake Via Stream 35 388h 2m -
Southern Water DURLEY LANE DURLEY CEO - 108835 River Hamble 24 188h 41m -
Southern Water BISHOPS WALTHAM SSO - 115716 River Hamble 11 132h 46m -
Southern Water HEATHEN LANE DURLEY CEO - 108836 Ford Lake Via Stream 12 119h 51m -
Southern Water DURLEY LANE DURLEY CEO - 108835 River Hamble 5 53h 27m -
Southern Water Unknown Unknown 6 20h 44m -
Southern Water HARESTOCK SSO - 115789 River Itchen 2 17h 58m -
Southern Water Unknown Unknown 3 11h 7m -
Southern Water ASHTON CORNER CEO - 108898 River Hamble 2 4h 59m -
Southern Water GARNIER ROAD WINCHESTER CEO - 108433 Freshwater River 1 4h 36m -
Southern Water NEW ALRESFORD SSO - 115779 Groundwater 1 2h 21m -
Southern Water GARNIER ROAD WINCHESTER CEO - 108433 Freshwater River 2 2h 13m -
Southern Water MORESTEAD ROAD WINCHESTER PUMPED SSO - 116368 Groundwaters Via 2 Infilt Syst 1 1h 34m -
Southern Water SPRING GARDENS ALRESFORD CEO - 108484 River Itchen 1 0h 40m -
Southern Water SPRING GARDENS ALRESFORD CEO - 108484 River Itchen 0 0h -
Southern Water NEW ALRESFORD SSO - 115779 Groundwater 0 0h -
Southern Water MORESTEAD ROAD WINCHESTER SSO - 115740 Groundwaters Via 2 Infilt Syst 0 0h -
Southern Water BISHOPS WALTHAM SSO - 115716 River Hamble 0 0h -
Southern Water HARESTOCK SSO - 115789 River Itchen 0 0h -
Southern Water Unknown Unknown 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.