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Polluted by sewage 272 hours in 2025
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We get information about overflowing CSOs since January 2025. Here is a chart of the last three months of data for Portsmouth North, here you can see overflows in red, the darker the red, the more the CSO overflowed that day.
Each CSO has a row, the most recent data is on the right hand side.
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Donate Now| Company | Site Name | Receiving Waterway | Overflow Days | Total Duration (hours) | Total Duration (days) |
|---|---|---|---|---|---|
| Southern Water | GLADYS AVENUE PORTSMOUTH CSO - 108434 | Portsmouth Harbour | 26 | 74 h 21m | 3.08 |
| Southern Water | NORTH END AVENUE PORTSMOUTH CSO - 108773 | Portsmouth Harbour | 20 | 45 h 16m | 1.88 |
| Southern Water | COURT LANE COSHAM SSO - 115958 | Ports Creek | 10 | 36 h 31m | 1.5 |
| Southern Water | STAMSHAW ROAD PORTSMOUTH CSO - 109337 | Portsmouth Harbour | 8 | 33 h 27m | 1.38 |
| Southern Water | MILE END ROAD PORTSMOUTH NO X CSO - 108459 | Portsmouth Harbour | 13 | 20 h 50m | 0.83 |
| Southern Water | GLADYS AVENUE PORTSMOUTH CSO - 108434 | Portsmouth Harbour | 9 | 16 h 6m | 0.67 |
| Southern Water | NORTH END AVENUE PORTSMOUTH CSO - 108773 | Portsmouth Harbour | 4 | 11 h 16m | 0.46 |
| Southern Water | COURT LANE COSHAM SSO - 115958 | Ports Creek | 4 | 10 h 48m | 0.42 |
| Southern Water | MAINLAND DRAYTON SSO - 115960 | Ports Creek | 4 | 10 h 11m | 0.42 |
| Southern Water | MILE END ROAD PORTSMOUTH NO 1 CSO - 108415 | Portsmouth Harbour | 4 | 5 h 55m | 0.21 |
| Southern Water | WIDLEY ROAD PORTSMOUTH CSO - 108772 | Portsmouth Harbour | 5 | 4 h 44m | 0.17 |
| Southern Water | ST ANDREWS ROAD PORTSMOUTH CSO - 108474 | Broom Channel | 3 | 1 h 49m | 0.04 |
| Southern Water | NEWCOMEN ROAD PORTSMOUTH CSO - 108460 | Portsmouth Harbour | 2 | 0 h 36m | 0 |
| Southern Water | WINSTANLEY ROAD PORTSMOUTH CSO - 108504 | Portsmouth Harbour | 1 | 0 h 4m | 0 |
| Southern Water | WIDLEY ROAD PORTSMOUTH CSO - 108772 | Portsmouth Harbour | 0 | 0 h | 0 |
| Southern Water | MILE END ROAD PORTSMOUTH NO X CSO - 108459 | Portsmouth Harbour | 0 | 0 h | 0 |
| Southern Water | MAINLAND DRAYTON SSO - 115960 | Ports Creek | 0 | 0 h | 0 |
| Southern Water | MILE END ROAD PORTSMOUTH NO 1 CSO - 108415 | Portsmouth Harbour | 0 | 0 h | 0 |
| Southern Water | WINSTANLEY ROAD PORTSMOUTH CSO - 108504 | Portsmouth Harbour | 0 | 0 h | 0 |
| Southern Water | STAMSHAW ROAD PORTSMOUTH CSO - 109337 | Portsmouth Harbour | 0 | 0 h | 0 |
| Southern Water | KIRTLEY CLOSE DRAYTON CSO - 108774 | Langstone Harbour | 0 | 0 h | 0 |
| Southern Water | NEWCOMEN ROAD PORTSMOUTH CSO - 108460 | Portsmouth Harbour | 0 | 0 h | 0 |
| Southern Water | ST ANDREWS ROAD PORTSMOUTH CSO - 108474 | Broom Channel | 0 | 0 h | 0 |
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.
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