Polluted by sewage 373 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 St Helens South and Whiston, 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) |
|---|---|---|---|---|---|
| United Utilities | Watery Lane CSO | Chain Caul Storm Culvert | 14 | 78 h 37m | 3.25 |
| United Utilities | Warrington New Road CSO | Hardshaw Brook | 15 | 56 h 39m | 2.33 |
| United Utilities | Gaskell Street CSO | Sutton Brook Sankey Brook | 26 | 50 h 37m | 2.08 |
| United Utilities | Sankey Brook (St Helens) CSO | Rainford Brook | 16 | 44 h 29m | 1.83 |
| United Utilities | St Helens Road CSO | Eccleston Mere | 21 | 43 h 58m | 1.79 |
| United Utilities | Jackson Street CSO | Hardshaw Brook | 12 | 22 h 20m | 0.92 |
| United Utilities | Haresfinch Road CSO | Rainford Brook | 17 | 20 h 32m | 0.83 |
| United Utilities | Haresfinch Road CSO | Rainford Brook | 6 | 14 h 2m | 0.58 |
| United Utilities | Gaskell Street CSO | Sutton Brook Sankey Brook | 6 | 11 h 58m | 0.46 |
| United Utilities | Watery Lane CSO | Chain Caul Storm Culvert | 2 | 11 h 52m | 0.46 |
| United Utilities | Leach Lane (St. Helens) CSO | Sutton Mill Brook | 6 | 6 h 18m | 0.25 |
| United Utilities | Warrington New Road CSO | Hardshaw Brook | 5 | 6 h 5m | 0.25 |
| United Utilities | Warrington New Road CSO | Hardshaw Brook | 4 | 3 h 2m | 0.12 |
| United Utilities | St Helens Road CSO | Eccleston Mere | 5 | 1 h 44m | 0.04 |
| United Utilities | Jackson Street CSO | Hardshaw Brook | 1 | 0 h 42m | 0 |
| United Utilities | Sankey Brook (St Helens) CSO | Rainford Brook | 1 | 0 h 32m | 0 |
| United Utilities | 95 Mill Lane (St.Helens) CSO | River Tame | 1 | 0 h 18m | 0 |
| United Utilities | Leach Lane (St. Helens) CSO | Sutton Mill Brook | 0 | 0 h | 0 |
| United Utilities | Liverpool Road CSO (42062) | Hardshaw Brook | 0 | 0 h | 0 |
| United Utilities | 95 Mill Lane (St.Helens) CSO | River Tame | 0 | 0 h | 0 |
| United Utilities | Liverpool Road CSO (42062) | Hardshaw Brook | 0 | 0 h | 0 |
| United Utilities | Cooper Street | Hardshaw Brook | 0 | 0 h | 0 |
| United Utilities | Cooper Street | Hardshaw Brook | 0 | 0 h | 0 |
| United Utilities | Warrington New Road CSO | Hardshaw Brook | 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.