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North West Hampshire - 2025 Sewage

Polluted by sewage 3,313 hours in 2025 , monitoring offline 764 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 live data (𝑥 if not)

View Annual Sewage Data

You're looking at the totals that we have calculated for sewage in North West Hampshire 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.

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Constituencies near North West Hampshire

Daily Data

Jan - 1,147 hours
Feb - 1,041 hours
Mar - 233 hours , 194 offline
Apr - 0 hours , 151 offline
May - 0 hours
Jun - 1 hours
Jul - 0 hours
Aug - 0 hours , 164 offline
Sept - 0 hours , 254 offline
Oct - 2 hours
Nov - 93 hours
Dec - 792 hours
Daily data is experimental and data is not guaranteed to be accurate. Please inform us of any issue, we will fix.
Please note: We don't have rainfall data for Wales. If you know where to source it please let us know!
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Totals so far

Company Site Name Receiving Waterway Overflow Days Total Duration (hours) Offline/Potential Pollution
Thames Water Kingsclere STW Kingsclere Brook 38 701h 15m -
Southern Water OVERTON SSO - 115916 Groundwater 40 543h 14m -
Thames Water West Heath (Charter Alley) SPS Bow Brook 29 434h 497 h
Thames Water Wash Water STW Pound Street Brook 26 391h -
Thames Water Wash Water STW Pound Street Brook 20 312h 15m -
Thames Water Knights Lane (Ball Hill) SPS Enbourn 16 258h -
Thames Water Knights Lane (Ball Hill) SPS Enbourn 13 166h 45m -
Thames Water Kingsclere STW Kingsclere Brook 13 160h 45m -
Thames Water Blind Mans Gate (Highclere) SPS Penwood Stream 14 135h -
Thames Water West Heath (Charter Alley) SPS Bow Brook 8 115h 15m -
Thames Water Blind Mans Gate (Highclere) SPS Penwood Stream 6 48h -
Southern Water Unknown Unknown 5 20h 56m -
Southern Water OVERTON SSO - 115916 Groundwater 2 12h 9m -
Thames Water St Stephens Hall (Little London) SPS Bow Brook 17 7h 8m -
Thames Water Swains Road (Tadley) SPS Silchester Brook 1 5h 15m -
Thames Water St Stephens Hall (Little London) SPS Bow Brook 4 1h 20m -
Thames Water Swains Road (Tadley) SPS Silchester Brook 1 1h 267 h

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.

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Analysing sewage pollution by the Water Industry

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© 2020-2025 Top-Of-The-Poops CC-BY-SA 4.0,
© Openstreetmap contributors, Contains OS data © Crown copyright and database right 2021-2025,
Contains Water UK National Storm Overflow Hub Data CC-BY-SA 4.0 and analysis © 2025 Top-Of-The-Poops

Some data reproduced under Open Government Licence

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