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Here are all the reported sewage overflow totals for Portsmouth Harbour in 2025. Sometimes sewage can be being dumped for months at a time.
| Company | Waterway | Site | Sewage Dumps | Duration (Hours) | Reporting % |
|---|---|---|---|---|---|
| Southern Water | Portsmouth Harbour | GRUNEISON ROAD STORM PS | 43 | 100 | 94.4 |
| Southern Water | Portsmouth Harbour | NORTH END AVENUE PORTSMOUTH CSO | 31 | 63 | 99.7 |
| Southern Water | Portsmouth Harbour | GROVE ROAD GOSPORT CEO | 8 | 33 | 99.7 |
| Southern Water | Portsmouth Harbour | MILE END ROAD CSO | 18 | 19 | 99.7 |
| Southern Water | Portsmouth Harbour | COMMERCIAL ROAD/RUDMORE ROAD CSO | 4 | 5 | 99.7 |
| Southern Water | Portsmouth Harbour | WIDLEY ROAD PORTSMOUTH CSO | 5 | 4 | 99.7 |
| Southern Water | Portsmouth Harbour | SALTERNS LANE FAREHAM CEO | 4 | 2 | 100 |
| Southern Water | Portsmouth Harbour | CAMBRIDGE ROAD/BROCKHURST ROAD PS | 3 | 1 | 100 |
| Southern Water | Portsmouth Harbour | WICOR MILL LANE PORTCHESTER CEO | 5 | 1 | 100 |
| Southern Water | Portsmouth Harbour | COW LANE PORTCHESTER CEO | 1 | 0 | 100 |
| Southern Water | Portsmouth Harbour | HARBOUR ROAD GOSPORT CEO | 1 | 0 | 99.7 |
| Southern Water | Portsmouth Harbour | SALTERNS LANE FAREHAM O/S 12 CSO | 1 | 0 | 100 |
| Southern Water | Portsmouth Harbour | HARDWAY CEO, PRIORY ROAD, GOSPORT | 0 | 0 | 100 |
| Southern Water | Portsmouth Harbour | LEES LANE GOSPORT CEO | 0 | 0 | 100 |
| Southern Water | Portsmouth Harbour | MIDDLECROFT LANE GOSPORT CSO | 0 | 0 | 99.7 |
| Southern Water | Portsmouth Harbour | MUMBY ROAD GOSPORT WPS/CEO | 0 | 0 | 99.5 |
| Southern Water | Portsmouth Harbour | ST MATTHEWS SQUARE GOSPORT CEO | 0 | 0 | 99.7 |
| Southern Water | Portsmouth Harbour | THE ANCHORAGE GOSPORT CEO | 0 | 0 | 99.9 |
| Southern Water | Portsmouth Harbour | HOLBROOK ROAD/PYNING STREET CSO | 0 | 0 | 99.7 |
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. 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.
Get in touch if you have queries or want to discuss our data.
press [at] top-of-the-poops.org