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Polluted by sewage 2,805 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 Runcorn and Helsby, 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 | ELLESMERE PORT WwTW | Thornton Brook/River Gowy | 59 | 812 h 46m | 33.83 |
| United Utilities | Mickle Trafford PS | Stanney Mill Brook | 32 | 386 h 24m | 16.08 |
| United Utilities | RUNCORN WwTW | M/C Ship Canal | 16 | 174 h 36m | 7.25 |
| United Utilities | Newtown PS | River Weaver | 28 | 171 h 22m | 7.12 |
| United Utilities | Mickle Trafford PS | Stanney Mill Brook | 13 | 164 h 10m | 6.83 |
| United Utilities | Mickle Trafford PS | Stanney Mill Brook | 28 | 148 h 52m | 6.17 |
| United Utilities | Expressway 8, Runcorn (Weston Point, Point R) CSO | Manchester Ship Canal | 41 | 113 h 34m | 4.71 |
| United Utilities | ELLESMERE PORT WwTW | Thornton Brook/River Gowy | 16 | 96 h 58m | 4 |
| United Utilities | Hardwick Street CSO | Manchester Ship Canal | 28 | 91 h 13m | 3.79 |
| United Utilities | Town PS | Manchester Ship Canal | 7 | 70 h 15m | 2.92 |
| United Utilities | HELSBY WwTW | Hornsmill Brook | 6 | 69 h 30m | 2.88 |
| United Utilities | Penn Lane (Weston Point, Point R) combined sewer overflow (202LE) (HAL0060) | Manchester Ship Canal | 40 | 59 h 54m | 2.46 |
| United Utilities | Halton Brow CSO | Manchester Ship Canal | 41 | 58 h 20m | 2.42 |
| United Utilities | Off Well Lane Kingsley CSO | Kingsley Brook | 15 | 43 h 44m | 1.79 |
| United Utilities | RUNCORN WwTW | M/C Ship Canal | 6 | 43 h 42m | 1.79 |
| United Utilities | Elton PS | West Central Drain, Mersey Est | 12 | 40 h 6m | 1.67 |
| United Utilities | Off Well Lane Kingsley CSO | Kingsley Brook | 21 | 37 h 10m | 1.54 |
| United Utilities | Town PS | Manchester Ship Canal | 6 | 30 h 39m | 1.25 |
| United Utilities | Mickle Trafford PS | Stanney Mill Brook | 6 | 29 h 8m | 1.21 |
| United Utilities | Newtown PS | River Weaver | 4 | 25 h 7m | 1.04 |
| United Utilities | Waterside Drive CSO | River Weaver | 18 | 23 h 39m | 0.96 |
| United Utilities | HELSBY WwTW | Hornsmill Brook | 5 | 19 h 32m | 0.79 |
| United Utilities | Expressway 8, Runcorn (Weston Point, Point R) CSO | Manchester Ship Canal | 10 | 16 h 26m | 0.67 |
| United Utilities | Hardwick Street CSO | Manchester Ship Canal | 4 | 14 h 48m | 0.58 |
| United Utilities | High Street/Moors Lane CSO | Main Drain | 10 | 11 h 52m | 0.46 |
| United Utilities | Runcorn Town Hall CSO | Willow Brook | 5 | 8 h 54m | 0.33 |
| United Utilities | Penn Lane (Weston Point, Point R) combined sewer overflow (202LE) (HAL0060) | Manchester Ship Canal | 7 | 8 h 32m | 0.33 |
| United Utilities | RUNCORN ROAD CSO | Manchester Ship Canal | 7 | 7 h 6m | 0.29 |
| United Utilities | Trentham Street PS | River Mersey | 8 | 7 h 1m | 0.29 |
| United Utilities | Halton Brow CSO | Manchester Ship Canal | 8 | 6 h 48m | 0.25 |
| United Utilities | The Brow CSO | Manchester Ship Canal | 3 | 3 h 2m | 0.12 |
| United Utilities | HELSBY WwTW | Hornsmill Brook | 1 | 2 h 37m | 0.08 |
| United Utilities | Daresbury CSO | River Mersey | 6 | 2 h 8m | 0.08 |
| United Utilities | Hatley Lane | Frodsham Marsh Ditch | 6 | 1 h 16m | 0.04 |
| United Utilities | Whitby Road CSO | Manchester Ship Canal | 5 | 1 h 6m | 0.04 |
| United Utilities | Waterside Drive CSO | River Weaver | 1 | 0 h 52m | 0 |
| United Utilities | Waterloo Road Sewer | Manchester Ship Canal | 5 | 0 h 50m | 0 |
| United Utilities | Trentham Street PS | River Mersey | 2 | 0 h 39m | 0 |
| United Utilities | Bridge Lane | River Weaver | 3 | 0 h 28m | 0 |
| United Utilities | Windsor Grove CSO | Willow Brook | 1 | 0 h 18m | 0 |
| United Utilities | RUNCORN ROAD CSO | Manchester Ship Canal | 1 | 0 h 14m | 0 |
| United Utilities | The Brow CSO | Manchester Ship Canal | 0 | 0 h | 0 |
| United Utilities | Elton PS | West Central Drain, Mersey Est | 0 | 0 h | 0 |
| United Utilities | ICI Saltworks PS | Manchester Ship Canal Via Sws | 0 | 0 h | 0 |
| United Utilities | Hapsford PS | Hornsmill Brook | 0 | 0 h | 0 |
| United Utilities | HELSBY WwTW | Hornsmill Brook | 0 | 0 h | 0 |
| United Utilities | Hatley Lane | Frodsham Marsh Ditch | 0 | 0 h | 0 |
| United Utilities | South Parade CSO | Weaver Navigation | 0 | 0 h | 0 |
| United Utilities | Waterloo Road Sewer | Manchester Ship Canal | 0 | 0 h | 0 |
| United Utilities | Whitby Road CSO | Manchester Ship Canal | 0 | 0 h | 0 |
| United Utilities | Bridge Lane | River Weaver | 0 | 0 h | 0 |
| United Utilities | Hapsford PS | Hornsmill Brook | 0 | 0 h | 0 |
| United Utilities | Windsor Grove CSO | Willow Brook | 0 | 0 h | 0 |
| United Utilities | High Street/Moors Lane CSO | Main Drain | 0 | 0 h | 0 |
| United Utilities | Runcorn Town Hall CSO | Willow Brook | 0 | 0 h | 0 |
| United Utilities | ICI Saltworks PS | Manchester Ship Canal Via Sws | 0 | 0 h | 0 |
| United Utilities | South Parade CSO | Weaver Navigation | 0 | 0 h | 0 |
| United Utilities | Daresbury CSO | River Mersey | 0 | 0 h | 0 |
| United Utilities | Downs Road CSO | Bridgewater Canal Via Sws | 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