Media Queries
Get in touch if you have queries or want to discuss our data.
press [at] top-of-the-poops.org
Please Support Us
We rely on donations to fund our work. Please support us if you can
Polluted by sewage 4,143 hours in 2025
Your local MP is Sarah Hall (Labour/Co-operative) - Find out more about their interests, donors, and voting at They Work For You
We get information about overflowing CSOs since January 2025. Here is a chart of the last three months of data for Warrington South, 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.
We managed to raise £150 in 2024. That's not enough to keep the site running. Please consider a one-off or small recurring donation.
Donate Now| Company | Site Name | Receiving Waterway | Overflow Days | Total Duration (hours) | Total Duration (days) |
|---|---|---|---|---|---|
| United Utilities | Thewlis Street CSO | River Mersey | 68 | 1,062 h 25m | 44.25 |
| United Utilities | Whittle Brook PS | Mersey Estuary | 35 | 608 h 55m | 25.33 |
| United Utilities | WARRINGTON NORTH WwTW | Mersey Estuary | 40 | 348 h 3m | 14.5 |
| United Utilities | WARRINGTON SOUTH WwTW | M/C Ship Canal | 25 | 231 h | 9.62 |
| United Utilities | WALTON PUMPING STATION | Manchester Ship Canal | 23 | 216 h 11m | 9 |
| United Utilities | WARRINGTON NORTH WwTW | Mersey Estuary | 21 | 172 h 40m | 7.17 |
| United Utilities | WARRINGTON SOUTH WwTW | M/C Ship Canal | 22 | 158 h 10m | 6.58 |
| United Utilities | Longford Barrage CSO | Longford Brook | 15 | 158 h 2m | 6.58 |
| United Utilities | Athlone Road CSO | Longford Brook | 12 | 122 h 8m | 5.08 |
| United Utilities | Hall Nook CSO (481XO) (WAR0007) | Penketh Brook | 42 | 105 h 50m | 4.38 |
| United Utilities | Kingsway CSO | River Mersey | 60 | 100 h | 4.17 |
| United Utilities | Lodge Lane, Bewsey CSO | Ellams Brook, Newton Brook | 21 | 96 h 6m | 4 |
| United Utilities | Longshaw Street CSO | Sankey Brook | 10 | 93 h 13m | 3.88 |
| United Utilities | Bewsey Bridge PS | Sankey Brook | 8 | 86 h 9m | 3.58 |
| United Utilities | 6 Sandy Lane West (Longford) CSO | Mill Brook Via Sws | 7 | 77 h | 3.21 |
| United Utilities | 4 Tavlin Avenue CSO | Dallam Brook Via Sws | 7 | 60 h 42m | 2.5 |
| United Utilities | Thornton Road Depot CSO | Sankey Brook | 13 | 47 h 32m | 1.96 |
| United Utilities | Longford Barrage CSO | Longford Brook | 4 | 45 h 57m | 1.88 |
| United Utilities | WARRINGTON NORTH WwTW | Mersey Estuary | 10 | 39 h 30m | 1.62 |
| United Utilities | Lodge Lane, Bewsey CSO | Ellams Brook, Newton Brook | 4 | 39 h 24m | 1.62 |
| United Utilities | Kingsway CSO | River Mersey | 16 | 32 h 44m | 1.33 |
| United Utilities | Athlone Road CSO | Longford Brook | 3 | 29 h 4m | 1.21 |
| United Utilities | Bewsey Bridge PS | Sankey Brook | 3 | 26 h 21m | 1.08 |
| United Utilities | Junction Sandy Lane/ Bough Avenue CSO | Mill Brook Via Sws | 9 | 26 h 1m | 1.08 |
| United Utilities | Hall Nook CSO (481XO) (WAR0007) | Penketh Brook | 6 | 21 h 14m | 0.88 |
| United Utilities | KNUTSFORD / GRAMMAR SCHOOL ROAD CSO | Manchester Ship Canal | 21 | 19 h 32m | 0.79 |
| United Utilities | ELLESMERE ROAD CSO | Manchester Ship Canal | 9 | 19 h 6m | 0.79 |
| United Utilities | WALTON PUMPING STATION | Manchester Ship Canal | 2 | 18 h 32m | 0.75 |
| United Utilities | Longshaw Street CSO | Sankey Brook | 2 | 18 h 5m | 0.75 |
| United Utilities | Highfield Avenue CSO | Whittle Brook Via Sws | 6 | 15 h 42m | 0.62 |
| United Utilities | Junction Sandy Lane/ Bough Avenue CSO | Mill Brook Via Sws | 2 | 13 h 58m | 0.54 |
| United Utilities | Causeway Pumping Station | River Mersey | 8 | 9 h | 0.38 |
| United Utilities | 4 Tavlin Avenue CSO | Dallam Brook Via Sws | 2 | 8 h 26m | 0.33 |
| United Utilities | Westy Flumes (1) South CSO | River Mersey | 5 | 6 h 54m | 0.25 |
| United Utilities | The Warrington Road CSO | Whittle Brook | 2 | 3 h 19m | 0.12 |
| United Utilities | Whittle Brook PS | Mersey Estuary | 2 | 3 h 8m | 0.12 |
| United Utilities | Grappenhall Resewerage Scheme | Manchester Ship Canal | 1 | 1 h 10m | 0.04 |
| United Utilities | Thornton Road Depot CSO | Sankey Brook | 1 | 0 h 58m | 0 |
| United Utilities | WARRINGTON NORTH WwTW | Mersey Estuary | 1 | 0 h 31m | 0 |
| United Utilities | ELLESMERE ROAD CSO | Manchester Ship Canal | 1 | 0 h 30m | 0 |
| United Utilities | Grappenhall Resewerage Scheme | Manchester Ship Canal | 0 | 0 h | 0 |
| United Utilities | Westy Flumes (1) South CSO | River Mersey | 0 | 0 h | 0 |
| United Utilities | 6 Sandy Lane West (Longford) CSO | Mill Brook Via Sws | 0 | 0 h | 0 |
| United Utilities | Thewlis Street CSO | River Mersey | 0 | 0 h | 0 |
| United Utilities | Sankey Bridge PS | Sankey Brook | 0 | 0 h | 0 |
| United Utilities | The Warrington Road CSO | Whittle Brook | 0 | 0 h | 0 |
| United Utilities | KNUTSFORD / GRAMMAR SCHOOL ROAD CSO | Manchester Ship Canal | 0 | 0 h | 0 |
| United Utilities | Sankey Bridge PS | Sankey Brook | 0 | 0 h | 0 |
| United Utilities | Causeway Pumping Station | River Mersey | 0 | 0 h | 0 |
| United Utilities | Highfield Avenue CSO | Whittle Brook 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