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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 Lewes, 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 | HAM LANE LEWES NEW SSO - 115974 | Tidal River Ouse | 99 | 1,642 h 59m | 68.42 |
| Southern Water | DITCHLING SSO - 115798 | Bevern Stream | 54 | 788 h 44m | 32.83 |
| Southern Water | LAUGHTON CSO - 108272 | Glynde Reach | 39 | 442 h 35m | 18.42 |
| Southern Water | DITCHLING SSO - 115798 | Bevern Stream | 23 | 388 h 18m | 16.17 |
| Southern Water | HAM LANE LEWES NEW SSO - 115974 | Tidal River Ouse | 30 | 319 h 8m | 13.29 |
| Southern Water | NEAVES LANE RINGMER SSO - 115794 | Bulldog Sewer / Glynde Reach | 33 | 311 h 35m | 12.96 |
| Southern Water | NEAVES LANE RINGMER SSO - 115794 | Bulldog Sewer / Glynde Reach | 18 | 270 h | 11.25 |
| Southern Water | UPPER DICKER CEO - 108776 | Freshwater River | 36 | 261 h 55m | 10.88 |
| Southern Water | DITTONS ROAD POLEGATE CSO - 111654 | Drockmill Hill Gut | 25 | 220 h 5m | 9.17 |
| Southern Water | ALFRISTON CEO - 108359 | River Cuckmere | 11 | 204 h 26m | 8.5 |
| Southern Water | LAUGHTON CSO - 108272 | Glynde Reach | 13 | 173 h 51m | 7.21 |
| Southern Water | RIPE CEO - 116043 | Unnamed Glynde Reach/Ouse | 19 | 161 h 17m | 6.71 |
| Southern Water | NEWHAVEN MAIN CSO - 116065 | English Channel | 33 | 153 h 33m | 6.38 |
| Southern Water | WILLINGDON NO 2 CEO - 108777 | New Stream Ditch | 22 | 147 h 30m | 6.12 |
| Southern Water | UPPER DICKER CEO - 108776 | Freshwater River | 14 | 129 h 18m | 5.38 |
| Southern Water | LYNHOLM ROAD POLEGATE NO.2 SSO - 115316 | Mill Ditch | 21 | 122 h 44m | 5.08 |
| Southern Water | WILLINGDON NO 1 CSO - 108383 | New Stream Ditch | 19 | 106 h 20m | 4.42 |
| Southern Water | COURT ROAD LEWES CEO - 110624 | River Ouse | 6 | 105 h 15m | 4.38 |
| Southern Water | WILLINGDON NO 1 CSO - 108383 | New Stream Ditch | 11 | 100 h 18m | 4.17 |
| Southern Water | SELMESTON CEO - 108884 | Glynde Reach | 7 | 86 h 16m | 3.58 |
| Southern Water | LYNHOLM ROAD POLEGATE NO.1 CSO - 115317 | Mill Ditch | 16 | 73 h 34m | 3.04 |
| Southern Water | NEWHAVEN MAIN CSO - 116065 | English Channel | 11 | 68 h 40m | 2.83 |
| Southern Water | LYNHOLM ROAD POLEGATE NO.2 SSO - 115316 | Mill Ditch | 6 | 50 h 52m | 2.08 |
| Southern Water | DITTONS ROAD POLEGATE CSO - 111654 | Drockmill Hill Gut | 5 | 45 h 23m | 1.88 |
| Southern Water | WILLINGDON NO 2 CEO - 108777 | New Stream Ditch | 6 | 44 h 24m | 1.83 |
| Southern Water | STRAWLANDS PLUMPTON GREEN CEO - 108350 | Bevern Stream | 7 | 41 h 56m | 1.71 |
| Southern Water | RIPE CEO - 116043 | Unnamed Glynde Reach/Ouse | 4 | 34 h 4m | 1.42 |
| Southern Water | LYNHOLM ROAD POLEGATE NO.1 CSO - 115317 | Mill Ditch | 6 | 32 h 25m | 1.33 |
| Southern Water | SOUTH STREET DITCHLING CSO - 109528 | Unnamed Herrings Stream | 5 | 24 h 16m | 1 |
| Southern Water | STRAWLANDS PLUMPTON GREEN CEO - 108350 | Bevern Stream | 3 | 21 h 37m | 0.88 |
| Southern Water | KINGSTON HOLLOW CEO - 115990 | Celery Sewer River Ouse | 12 | 16 h 55m | 0.67 |
| Southern Water | BERWICK SSO - 115848 | River Cuckmere | 3 | 12 h 26m | 0.5 |
| Southern Water | SOUTH STREET DITCHLING CSO - 109528 | Unnamed Herrings Stream | 9 | 10 h 8m | 0.42 |
| Southern Water | KINGSTON HOLLOW CEO - 115990 | Celery Sewer River Ouse | 6 | 8 h 53m | 0.33 |
| Southern Water | BERWICK SSO - 115848 | River Cuckmere | 1 | 7 h 1m | 0.29 |
| Southern Water | CLIFF END SEAFORD CEO - 101257 | English Channel | 7 | 5 h 59m | 0.21 |
| Southern Water | EAST DEAN SSO - 115829 | Groundwaters Via Infiltration | 3 | 5 h 34m | 0.21 |
| Southern Water | SOUTHFIELD POLEGATE CSO - 108339 | Wannock Mill Stream | 4 | 2 h 12m | 0.08 |
| Southern Water | BEACH ROAD NEWHAVEN STORM TANK CSO - 108083 | Tidal River Ouse | 1 | 2 h 5m | 0.08 |
| Southern Water | WANNOCK ROAD WANNOCK CSO - 109583 | Wannock Mill Stream | 4 | 1 h 48m | 0.04 |
| Southern Water | ALFRISTON CEO - 108359 | River Cuckmere | 1 | 0 h 37m | 0 |
| Southern Water | CLIFF END SEAFORD CEO - 101257 | English Channel | 1 | 0 h 26m | 0 |
| Southern Water | SOUTHFIELD POLEGATE CSO - 108339 | Wannock Mill Stream | 0 | 0 h | 0 |
| Southern Water | SELMESTON CEO - 108884 | Glynde Reach | 0 | 0 h | 0 |
| Southern Water | GLYNDE NORTH CEO - 108238 | Glynde Reach | 0 | 0 h | 0 |
| Southern Water | WANNOCK ROAD WANNOCK CSO - 109583 | Wannock Mill Stream | 0 | 0 h | 0 |
| Southern Water | COURT ROAD LEWES CEO - 110624 | River Ouse | 0 | 0 h | 0 |
| Southern Water | BEACH ROAD NEWHAVEN STORM TANK CSO - 108083 | Tidal River Ouse | 0 | 0 h | 0 |
| Southern Water | GLYNDE SOUTH CEO - 108239 | Glynde Reach River Ouse | 0 | 0 h | 0 |
| Southern Water | EAST DEAN SSO - 115829 | Groundwaters Via Infiltration | 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