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Polluted by sewage 337 times in 2025 lasting 1,523 hours
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Donate NowHere are all the reported sewage overflow totals for Portsmouth 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 place 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 | Solent/Langstone Harbour | BUDDS FARM WWTW | 52 | 628 | 99.5 |
| Southern Water | Solent | HENDERSON ROAD EASTNEY WPS | 86 | 499 | 97.5 |
| Southern Water | Portsmouth Harbour | GRUNEISON ROAD STORM PS | 43 | 100 | 94.4 |
| Southern Water | Ports Creek | COSHAM PS | 22 | 85 | 100 |
| Southern Water | Portsmouth Harbour | NORTH END AVENUE PORTSMOUTH CSO | 31 | 63 | 99.7 |
| Southern Water | Solent | PIER ROAD PS | 43 | 58 | 50.4 |
| Southern Water | Ports Creek | MAINLAND PS | 11 | 27 | 99.9 |
| Southern Water | Langstone Harbour | FORT CUMBERLAND STORMWATER TANKS | 9 | 23 | 99.8 |
| 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 | Broom Channel | ST ANDREWS ROAD PORTSMOUTH CSO | 3 | 1 | 99.9 |
| Southern Water | Portsmouth Harbour | WICOR MILL LANE PORTCHESTER CEO | 5 | 1 | 100 |
| Southern Water | River Wallington | LONE VALLEY WATERLOOVILLE CSO | 1 | 1 | 82.4 |
| 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 | Langstone Harbour | KIRTLEY CLOSE DRAYTON CSO | 2 | 0 | 100 |
| 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 | Great Salterns Lake | BURRFIELDS ROAD PORTSMOUTH CSO | 0 | 0 | 100 |
| 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
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