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Polluted by sewage 2,685 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 Blackburn, 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 | Dukes Brow Combined Sewer Overflow (Site ID 051SL) (BBN0069) | River Blakewater | 35 | 423 h 1m | 17.62 |
| United Utilities | SHARPLES STREET CSO | River Darwen | 121 | 365 h 41m | 15.21 |
| United Utilities | Aqueduct Road CSO | River Darwen | 41 | 214 h 21m | 8.92 |
| United Utilities | WHALLEY OLD ROAD / PROVIDENCE STREET CSO | Little Harwood Brook | 42 | 207 h 12m | 8.62 |
| United Utilities | PHILLIPS ROAD CSO | River Blakewater V Sws | 72 | 167 h 58m | 6.96 |
| United Utilities | Philips Road CSO | River Blakewater | 26 | 140 h 42m | 5.83 |
| United Utilities | Lower Audley Street CSO | River Blakewater | 39 | 122 h 16m | 5.08 |
| United Utilities | Aqueduct Road CSO | River Darwen | 16 | 121 h 21m | 5.04 |
| United Utilities | SHARPLES STREET CSO | River Darwen | 22 | 112 h 38m | 4.67 |
| United Utilities | Thwaites Brewery Yard CSO | River Blakewater | 41 | 100 h 1m | 4.17 |
| United Utilities | Appleby Street CSO | River Blakewater | 43 | 90 h 53m | 3.75 |
| United Utilities | Witton Tanks CSO | River Blakewater | 37 | 70 h 58m | 2.92 |
| United Utilities | Accrington Road CSO | Clvrt'D Section Knuzden Brook | 33 | 69 h 13m | 2.88 |
| United Utilities | Addison Close CSO | River Blakewater | 44 | 65 h 24m | 2.71 |
| United Utilities | Philips Road CSO | River Blakewater | 10 | 51 h 12m | 2.12 |
| United Utilities | PHILLIPS ROAD CSO | River Blakewater V Sws | 16 | 49 h 44m | 2.04 |
| United Utilities | Queens Park Road CSO | Queens Park Culvert | 22 | 39 h 41m | 1.62 |
| United Utilities | Bolton Road CSO | River Darwen | 33 | 39 h 32m | 1.62 |
| United Utilities | Dickens Street CSO | Queens Park Culvert | 13 | 34 h 1m | 1.42 |
| United Utilities | Thwaites Brewery Yard CSO | River Blakewater | 12 | 27 h 6m | 1.12 |
| United Utilities | Accrington Road CSO | Clvrt'D Section Knuzden Brook | 9 | 18 h 24m | 0.75 |
| United Utilities | Rolleston Road CSO | Norbury | 9 | 17 h 37m | 0.71 |
| United Utilities | Lower Audley Street CSO | River Blakewater | 10 | 17 h 8m | 0.71 |
| United Utilities | New Mill Street CSO | River Blakewater | 5 | 16 h 13m | 0.67 |
| United Utilities | Cumberland Street CSO | Queens Park Culvert Via Sws | 17 | 14 h 44m | 0.58 |
| United Utilities | Gorse Street CSO | River Darwen | 14 | 11 h 38m | 0.46 |
| United Utilities | Appleby Street CSO | River Blakewater | 10 | 11 h 16m | 0.46 |
| United Utilities | Witton Tanks CSO | River Blakewater | 8 | 10 h 38m | 0.42 |
| United Utilities | GATE STREET CSO | River Blakewater | 8 | 10 h 18m | 0.42 |
| United Utilities | Cherry Tree/Feniscowles CSO | River Darwen | 8 | 8 h 42m | 0.33 |
| United Utilities | Addison Close CSO | River Blakewater | 7 | 5 h 6m | 0.21 |
| United Utilities | Queens Park Road CSO | Queens Park Culvert | 5 | 4 h 38m | 0.17 |
| United Utilities | Bolton Road CSO | River Darwen | 6 | 4 h 36m | 0.17 |
| United Utilities | Dickens Street CSO | Queens Park Culvert | 2 | 3 h 30m | 0.12 |
| United Utilities | Fielden Street CSO | River Blakewater | 2 | 3 h 4m | 0.12 |
| United Utilities | Gorse Street CSO | River Darwen | 3 | 2 h 46m | 0.08 |
| United Utilities | Cherry Tree/Feniscowles CSO | River Darwen | 3 | 2 h 30m | 0.08 |
| United Utilities | WHALLEY OLD ROAD / PROVIDENCE STREET CSO | Little Harwood Brook | 6 | 1 h 54m | 0.04 |
| United Utilities | VICTORIA STREET CSO | River Blakewater | 5 | 1 h 52m | 0.04 |
| United Utilities | Cumberland Street CSO | Queens Park Culvert Via Sws | 3 | 1 h 30m | 0.04 |
| United Utilities | APPLE STREET CSO | River Blakewater | 6 | 1 h 4m | 0.04 |
| United Utilities | WELLINGTON ROAD CSO | River Darwen | 1 | 0 h 38m | 0 |
| United Utilities | Dukes Brow Combined Sewer Overflow (Site ID 051SL) (BBN0069) | River Blakewater | 2 | 0 h 36m | 0 |
| United Utilities | NOTRE DAME GARDENS CSO | River Blakewater | 1 | 0 h 34m | 0 |
| United Utilities | Beechwood Road CSO | River Blakewater | 1 | 0 h 30m | 0 |
| United Utilities | WHALLEY RANGE / MILLHAM STREET CSO | River Blakewater Via Sws | 3 | 0 h 24m | 0 |
| United Utilities | MANOR ROAD CSO | River Blakewater | 1 | 0 h 14m | 0 |
| United Utilities | Lark Hill/Brook House Lane CSO | River Blakewater | 2 | 0 h 12m | 0 |
| United Utilities | WHALLEY NEW ROAD CSO | River Blakewater | 3 | 0 h 8m | 0 |
| United Utilities | GATE STREET CSO | River Blakewater | 1 | 0 h 6m | 0 |
| United Utilities | Back Queen's Park Road CSO | Culvert Pringle St | 1 | 0 h 2m | 0 |
| United Utilities | Back Queen's Park Road CSO | Culvert Pringle St | 1 | 0 h 2m | 0 |
| United Utilities | PRINGLE STREET CSO | River Blakewater | 1 | 0 h 2m | 0 |
| United Utilities | Infirmary Street CSO | Leeds/Liverpool Canal | 0 | 0 h | 0 |
| United Utilities | Preston Old Road CSO | River Blakewater | 0 | 0 h | 0 |
| United Utilities | NOTRE DAME GARDENS CSO | River Blakewater | 0 | 0 h | 0 |
| United Utilities | Ramsgreave Drive CSO | River Blakewater | 0 | 0 h | 0 |
| United Utilities | Grimshaw Park CSO | River Blakewater | 0 | 0 h | 0 |
| United Utilities | WHALLEY RANGE / MILLHAM STREET CSO | River Blakewater Via Sws | 0 | 0 h | 0 |
| United Utilities | Preston Old Road CSO | River Blakewater | 0 | 0 h | 0 |
| United Utilities | Revidge Road/Preston New Road | Arley Brook | 0 | 0 h | 0 |
| United Utilities | Merchants Landing (Culvert Street) CSO | Culvert Culvert St | 0 | 0 h | 0 |
| United Utilities | WHALLEY NEW ROAD CSO | River Blakewater | 0 | 0 h | 0 |
| United Utilities | Beechwood Road CSO | River Blakewater | 0 | 0 h | 0 |
| United Utilities | APPLE STREET CSO | River Blakewater | 0 | 0 h | 0 |
| United Utilities | BROWNHILL DRIVE CSO | River Blakewater | 0 | 0 h | 0 |
| United Utilities | Whalley Range CSO | River Blakewater | 0 | 0 h | 0 |
| United Utilities | Grimshaw Park CSO | River Blakewater | 0 | 0 h | 0 |
| United Utilities | 293 PRESTON OLD ROAD CSO | River Darwen | 0 | 0 h | 0 |
| United Utilities | MANOR ROAD CSO | River Blakewater | 0 | 0 h | 0 |
| United Utilities | Whalley Range/Westley Street CSO | River Blakewater | 0 | 0 h | 0 |
| United Utilities | WELLINGTON ROAD CSO | River Darwen | 0 | 0 h | 0 |
| United Utilities | Whalley Range/Westley Street CSO | River Blakewater | 0 | 0 h | 0 |
| United Utilities | Rolleston Road CSO | Norbury | 0 | 0 h | 0 |
| United Utilities | BROWNHILL DRIVE CSO | River Blakewater | 0 | 0 h | 0 |
| United Utilities | Ramsgreave Drive CSO | River Blakewater | 0 | 0 h | 0 |
| United Utilities | Lark Hill/Brook House Lane CSO | River Blakewater | 0 | 0 h | 0 |
| United Utilities | Revidge Road/Preston New Road | Arley Brook | 0 | 0 h | 0 |
| United Utilities | DAISY LANE CSO | River Blakewater | 0 | 0 h | 0 |
| United Utilities | Fielden Street CSO | River Blakewater | 0 | 0 h | 0 |
| United Utilities | Great Bolton Street CSO | River Blakewater | 0 | 0 h | 0 |
| United Utilities | PRINGLE STREET CSO | River Blakewater | 0 | 0 h | 0 |
| United Utilities | Whalley Range CSO | River Blakewater | 0 | 0 h | 0 |
| United Utilities | VICTORIA STREET CSO | River Blakewater | 0 | 0 h | 0 |
| United Utilities | Merchants Landing (Culvert Street) CSO | Culvert Culvert St | 0 | 0 h | 0 |
| United Utilities | DAISY LANE CSO | River Blakewater | 0 | 0 h | 0 |
| United Utilities | New Mill Street CSO | River Blakewater | 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