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Polluted by sewage 2,724 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 North Somerset, 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) |
|---|---|---|---|---|---|
| Wessex Water | BUTCOMBE STORM TANK | Congresbury Yeo And Butcombe | 23 | 470 h 58m | 19.58 |
| Wessex Water | PORTISHEAD HIGH STREET NR BUILDERS YARD | Unknown | 31 | 453 h 24m | 18.88 |
| Wessex Water | PORTBURY WHARF THE DROVE PORTBURY INLET | Unknown | 40 | 425 h 43m | 17.71 |
| Wessex Water | WRINGTON | Congresbury Yeo | 18 | 269 h 8m | 11.21 |
| Wessex Water | PORTBURY WHARF THE DROVE PORTBURY INLET | Unknown | 30 | 221 h 21m | 9.21 |
| Wessex Water | BUTCOMBE STORM TANK | Congresbury Yeo And Butcombe | 9 | 130 h 15m | 5.42 |
| Wessex Water | KINGSTON SEYMOUR | Unknown | 15 | 110 h 52m | 4.58 |
| Wessex Water | WRINGTON | Congresbury Yeo | 8 | 86 h 15m | 3.58 |
| Wessex Water | PORTISHEAD BLACK NORE (NAUTICAL SCHOOL) | Severn Estuary | 10 | 72 h 1m | 3 |
| Wessex Water | PORTISHEAD BLACK NORE (NAUTICAL SCHOOL) | Severn Estuary | 19 | 49 h 33m | 2.04 |
| Wessex Water | PORTISHEAD PORTBURY DITCH OFF HARBOUR RD | Portbury Ditch | 10 | 49 h 2m | 2.04 |
| Wessex Water | PORTISHEAD HILLSIDE ROAD REDCLIFF BAY | River Severn | 11 | 44 h 46m | 1.83 |
| Wessex Water | PORTISHEAD PORTBURY DITCH OFF HARBOUR RD | Portbury Ditch | 7 | 40 h 58m | 1.67 |
| Wessex Water | KINGSTON SEYMOUR | Unknown | 9 | 38 h 41m | 1.58 |
| Wessex Water | PORTISHEAD TOWN HARBOUR ROAD | Portbury Ditch, | 7 | 36 h 59m | 1.5 |
| Wessex Water | PORTISHEAD HILLSIDE ROAD REDCLIFF BAY | River Severn | 23 | 32 h 32m | 1.33 |
| Wessex Water | WRINGTON WILTONS INLET | Congressbury Yeo | 5 | 31 h 44m | 1.29 |
| Wessex Water | PORTISHEAD TOWN HARBOUR ROAD | Portbury Ditch, | 8 | 28 h 48m | 1.17 |
| Wessex Water | CLEVEDON LADYE BAY | Bristol Channel | 10 | 21 h 5m | 0.88 |
| Wessex Water | Unknown | Unknown | 4 | 20 h 10m | 0.83 |
| Wessex Water | CLEVEDON MAIN | Bristol Channel | 6 | 17 h 13m | 0.71 |
| Wessex Water | CLEVEDON LADYE BAY | Bristol Channel | 13 | 16 h 10m | 0.67 |
| Wessex Water | PORTISHEAD LAKE GROUNDS | Estuary | 5 | 12 h 52m | 0.5 |
| Wessex Water | PORTISHEAD COOMBE/SLADE ROAD JUNCTION | Portbury Ditch | 16 | 9 h 34m | 0.38 |
| Wessex Water | PORTISHEAD HIGH STREET NR BUILDERS YARD | Unknown | 4 | 6 h 42m | 0.25 |
| Wessex Water | WRINGTON WILTONS INLET | Congressbury Yeo | 1 | 6 h 4m | 0.25 |
| Wessex Water | PORTISHEAD LAKE GROUNDS | Estuary | 4 | 4 h 44m | 0.17 |
| Wessex Water | Unknown | Unknown | 5 | 4 h 40m | 0.17 |
| Wessex Water | PORTISHEAD SLADE ROAD O/S XX | Portbury Ditch | 1 | 2 h 54m | 0.08 |
| Wessex Water | CLEVEDON MAIN | Bristol Channel | 4 | 2 h 53m | 0.08 |
| Wessex Water | PORTISHEAD COOMBE/SLADE ROAD JUNCTION | Portbury Ditch | 5 | 1 h 58m | 0.04 |
| Wessex Water | PORTISHEAD POACHER HOTEL (ANCHOR HOTEL) | Unknown | 2 | 1 h 42m | 0.04 |
| Wessex Water | PORTISHEAD SLADE ROAD O/S XX | Portbury Ditch | 3 | 1 h 24m | 0.04 |
| Wessex Water | CLEVEDON THE BEACH | Bristol Channel | 1 | 1 h 22m | 0.04 |
| Wessex Water | CLEVEDON OLD STREET O/S XX | Land Yeo | 1 | 0 h 12m | 0 |
| Wessex Water | CLEVEDON PARNELL ROAD | Land Yeo | 1 | 0 h 10m | 0 |
| Wessex Water | CLEVEDON THE BEACH | Bristol Channel | 1 | 0 h 6m | 0 |
| Wessex Water | CLEVEDON MARINE PARADE | Severn Estuary | 0 | 0 h | 0 |
| Wessex Water | PORTISHEAD BRAMPTON WAY | Portbury Via Sws | 0 | 0 h | 0 |
| Wessex Water | PORTISHEAD POACHER HOTEL (ANCHOR HOTEL) | Unknown | 0 | 0 h | 0 |
| Wessex Water | BRISTOL OLD MEAD WALK NO X | . Colliters Brook Via Sws | 0 | 0 h | 0 |
| Wessex Water | CLEVEDON MARINE PARADE | Severn Estuary | 0 | 0 h | 0 |
| Wessex Water | PORTBURY DROVE | Portbury Drove Rhyne | 0 | 0 h | 0 |
| Wessex Water | CLEVEDON PARNELL ROAD | Land Yeo | 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