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Polluted by sewage 249 times in 2025 lasting 2,976 hours
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Donate NowHere are all the reported sewage overflow totals for North West Hampshire 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 % |
|---|---|---|---|---|---|
| Thames Water | Kingsclere Brook | KINGSCLERE STW, KINGSCLERE, HANTS | 49 | 852 | 99.8 |
| Thames Water | Pound Street Brook | WASHWATER WWTW | 53 | 736 | 100 |
| Thames Water | Bow Brook | WEST HEATH RAMSDELL PUMPING STATION | 38 | 546 | 88 |
| Thames Water | Enbourn | Knights Lane | 30 | 424 | 100 |
| Southern Water | Groundwater | OVERTON WASTEWATER TREATMENT WORKS | 36 | 211 | 99.9 |
| Thames Water | Penwood Stream | Blind Mans Gate, Highclere | 21 | 183 | 100 |
| Thames Water | Bow Brook | Opposite St Stephen's Hall | 21 | 17 | 99.7 |
| Thames Water | Silchester Brook | Swains Road | 1 | 5 | 97.2 |
| Southern Water | River Anton | ANTON LANE CEO | 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