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Here are all the reported sewage overflow totals for River Darwen in 2025. Sometimes sewage can be being dumped for months at a time.
| Company | Waterway | Site | Sewage Dumps | Duration (Hours) | Reporting % |
|---|---|---|---|---|---|
| United Utilities | River Darwen | AQUEDUCT ROAD CSO | 53 | 335 | 97.3 |
| United Utilities | River Darwen | HENNEL LANE CSO | 43 | 317 | 99.8 |
| United Utilities | River Darwen | DARWEN WWTW | 39 | 266 | 100 |
| United Utilities | River Darwen | ANYON STREET/LAUREL AVE CSO | 63 | 107 | 99.4 |
| United Utilities | River Darwen | CLARENCE STREET CSO | 42 | 69 | 99.2 |
| United Utilities | River Darwen | HIGHER PERRY ST/BLACK LAUREL ST CSO | 68 | 61 | 99.6 |
| United Utilities | River Darwen | BOLTON ROAD COMBINED SEWER OVERFLOW | 45 | 45 | 100 |
| United Utilities | River Darwen | BALLE STREET HILTON STREET CSO | 46 | 27 | 96.3 |
| United Utilities | River Darwen | COTTON HALL STREET CSO | 43 | 26 | 99.8 |
| United Utilities | River Darwen | GRIMSHAW STREET CSO | 20 | 25 | 99.8 |
| United Utilities | River Darwen | SUDELL ROAD CSO | 26 | 25 | 99.9 |
| United Utilities | River Darwen | GORSE ST COMBINED SEWER OVERFLOW | 18 | 12 | 100 |
| United Utilities | River Darwen | CHERRY TREE WORKS SITE | 8 | 10 | 100 |
| United Utilities | River Darwen | CANN BRIDGE STREET CSO 40042 | 16 | 9 | 98.7 |
| United Utilities | River Darwen | CRANBERRY LANE CSO | 2 | 5 | 96.8 |
| United Utilities | River Darwen | BOLTON ROAD CSO | 5 | 1 | 99.1 |
| United Utilities | River Darwen | REDEARTH ROAD/SUDELL ROAD CSO | 3 | 0 | 100 |
| United Utilities | River Darwen | WELLINGTON ROAD CSO | 2 | 0 | 99.9 |
| United Utilities | River Darwen | FOOTPATH NR CROSS ST CSO | 3 | 0 | 100 |
| United Utilities | River Darwen | VALE STREET | 1 | 0 | 91.5 |
| United Utilities | River Darwen | 293 PRESTON OLD ROAD CSO (052M0) | 0 | 0 | 99.6 |
| United Utilities | River Darwen | BELGRAVE ROAD CSO | 0 | 0 | 100 |
| United Utilities | River Darwen | BOLTON ROAD CSO | 0 | 0 | 100 |
| United Utilities | River Darwen | KAY STREET CSO | 0 | 0 | 99.8 |
| United Utilities | River Darwen | QUEENS ROAD (DARWEN) CSO | 0 | 0 | 95.4 |
| United Utilities | River Darwen | SUDELLSIDE STREET | 0 | 0 | 89.2 |
| United Utilities | River Darwen | WOODVALE FLATS CSO | 0 | 0 | 99.6 |
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
Annual figures up to and including 2025 come from official water company returns. The 2026 figure is our own estimate, derived continuously from the companies' live data feeds.
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