It's a Dirty Business

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Blackburn - 2025 Sewage

Polluted by sewage 2,256 hours in 2025 , monitoring offline 426 hours , potential overflows 430 hours

© OpenStreetMap contributors
Contains OS Data © Crown copyright & database right 2021-2024
© Top of the Poops 2021-2024

Which Year?

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✔ means we have live data (𝑥 if not)

View Annual Sewage Data

You're looking at the totals that we have calculated for sewage in Blackburn for 2025. It is an estimate, based on very poor quality live data from the Water Companies. This may not align with the 'official' reported sewage values from the water companies, which is reported in April following then end of the year - so 2025 numbers are reported in April 2026.

What's a potential overflow? If the CSO goes 'Offline' while its Overflowing, we don't know if it stopped overflowing until we get a 'Stop' event.

Take Action

Your local MP is Adnan Hussain (Independent) - Find out more about their interests, donors, and voting at They Work For You

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Daily Data

Jan - 531 hours , 32 potential
Feb - 43 hours , 2 potential
Mar - 11 hours , 0 potential
Apr - 3 hours , 1 potential
May - 39 hours , 1 potential
Jun - 118 hours , 5 potential
Jul - 39 hours , 1 potential
Aug - 22 hours , 0 potential
Sept - 553 hours , 5 potential
Oct - 269 hours , 214 potential
Nov - 233 hours , 159 potential
Dec - 391 hours , 5 potential
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Thank you so much to everyone who contributed to the site in 2025 to keep it running. We do rely on your contributions! Developing and running a website costs real money.
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Totals so far

Company Site Name Receiving Waterway Overflow Days Total Duration (hours) Offline/Potential Pollution
United Utilities SHARPLES STREET CSO River Darwen 121 331 h 16m 48 h
United Utilities Aqueduct Road CSO River Darwen 41 214 h 21m -
United Utilities WHALLEY OLD ROAD / PROVIDENCE STREET CSO Little Harwood Brook 42 204 h 22m 3 h
United Utilities PHILLIPS ROAD CSO River Blakewater V Sws 72 168 h 26m 1 h
United Utilities Philips Road CSO River Blakewater 26 140 h 42m -
United Utilities Aqueduct Road CSO River Darwen 16 121 h 21m -
United Utilities SHARPLES STREET CSO River Darwen 22 105 h 50m 9 h
United Utilities Thwaites Brewery Yard CSO River Blakewater 41 100 h 1m -
United Utilities Lower Audley Street CSO River Blakewater 38 97 h 38m 24 h
United Utilities Appleby Street CSO River Blakewater 43 90 h 53m -
United Utilities Witton Tanks CSO River Blakewater 37 70 h 58m -
United Utilities Accrington Road CSO Clvrt'D Section Knuzden Brook 33 69 h 13m -
United Utilities Addison Close CSO River Blakewater 44 65 h 24m -
United Utilities Dukes Brow Combined Sewer Overflow (Site ID 051SL) (BBN0069) River Blakewater 20 63 h 50m 359 h
United Utilities Philips Road CSO River Blakewater 10 51 h 12m -
United Utilities PHILLIPS ROAD CSO River Blakewater V Sws 16 50 h 2m -
United Utilities Queens Park Road CSO Queens Park Culvert 22 39 h 41m -
United Utilities Bolton Road CSO River Darwen 33 39 h 32m -
United Utilities Dickens Street CSO Queens Park Culvert 13 34 h 1m -
United Utilities Thwaites Brewery Yard CSO River Blakewater 12 27 h 6m -
United Utilities Accrington Road CSO Clvrt'D Section Knuzden Brook 9 18 h 24m -
United Utilities Rolleston Road CSO Norbury 9 17 h 37m -
United Utilities Lower Audley Street CSO River Blakewater 10 17 h 8m -
United Utilities New Mill Street CSO River Blakewater 5 16 h 13m -
United Utilities Cumberland Street CSO Queens Park Culvert Via Sws 17 14 h 44m -
United Utilities Appleby Street CSO River Blakewater 10 11 h 16m -
United Utilities Witton Tanks CSO River Blakewater 8 10 h 38m -
United Utilities GATE STREET CSO River Blakewater 8 10 h 18m 0 h
United Utilities Gorse Street CSO River Darwen 14 9 h 21m 370 h
United Utilities Cherry Tree/Feniscowles CSO River Darwen 8 8 h 42m 3 h
United Utilities Addison Close CSO River Blakewater 7 5 h 6m -
United Utilities Queens Park Road CSO Queens Park Culvert 5 4 h 38m -
United Utilities Bolton Road CSO River Darwen 6 4 h 36m -
United Utilities Dickens Street CSO Queens Park Culvert 2 3 h 30m -
United Utilities Fielden Street CSO River Blakewater 2 3 h 4m -
United Utilities Gorse Street CSO River Darwen 3 2 h 46m -
United Utilities Cherry Tree/Feniscowles CSO River Darwen 3 2 h 30m -
United Utilities VICTORIA STREET CSO River Blakewater 5 2 h 8m -
United Utilities WHALLEY OLD ROAD / PROVIDENCE STREET CSO Little Harwood Brook 6 1 h 54m -
United Utilities Cumberland Street CSO Queens Park Culvert Via Sws 3 1 h 30m -
United Utilities APPLE STREET CSO River Blakewater 6 1 h 4m 2 h
United Utilities WELLINGTON ROAD CSO River Darwen 1 0 h 38m 0 h
United Utilities Dukes Brow Combined Sewer Overflow (Site ID 051SL) (BBN0069) River Blakewater 2 0 h 36m -
United Utilities NOTRE DAME GARDENS CSO River Blakewater 1 0 h 34m -
United Utilities Beechwood Road CSO River Blakewater 1 0 h 30m -
United Utilities WHALLEY RANGE / MILLHAM STREET CSO River Blakewater Via Sws 3 0 h 24m -
United Utilities MANOR ROAD CSO River Blakewater 1 0 h 14m -
United Utilities Lark Hill/Brook House Lane CSO River Blakewater 2 0 h 12m 4 h
United Utilities WHALLEY NEW ROAD CSO River Blakewater 3 0 h 10m -
United Utilities GATE STREET CSO River Blakewater 1 0 h 6m -
United Utilities Back Queen's Park Road CSO Culvert Pringle St 1 0 h 6m -
United Utilities PRINGLE STREET CSO River Blakewater 1 0 h 2m -
United Utilities Back Queen's Park Road CSO Culvert Pringle St 1 0 h 2m -
United Utilities Rolleston Road CSO Norbury 0 0 h -
United Utilities WHALLEY NEW ROAD CSO River Blakewater 0 0 h -
United Utilities PRINGLE STREET CSO River Blakewater 0 0 h -
United Utilities New Mill Street CSO River Blakewater 0 0 h -
United Utilities WELLINGTON ROAD CSO River Darwen 0 0 h -
United Utilities Whalley Range/Westley Street CSO River Blakewater 0 0 h 1 h
United Utilities Grimshaw Park CSO River Blakewater 0 0 h -
United Utilities Preston Old Road CSO River Blakewater 0 0 h -
United Utilities WHALLEY RANGE / MILLHAM STREET CSO River Blakewater Via Sws 0 0 h -
United Utilities Ramsgreave Drive CSO River Blakewater 0 0 h 3 h
United Utilities MANOR ROAD CSO River Blakewater 0 0 h -
United Utilities Fielden Street CSO River Blakewater 0 0 h -
United Utilities Merchants Landing (Culvert Street) CSO Culvert Culvert St 0 0 h 1 h
United Utilities APPLE STREET CSO River Blakewater 0 0 h -
United Utilities Merchants Landing (Culvert Street) CSO Culvert Culvert St 0 0 h -
United Utilities Whalley Range/Westley Street CSO River Blakewater 0 0 h -
United Utilities 293 PRESTON OLD ROAD CSO River Darwen 0 0 h -
United Utilities Whalley Range CSO River Blakewater 0 0 h 0 h
United Utilities Beechwood Road CSO River Blakewater 0 0 h -
United Utilities BROWNHILL DRIVE CSO River Blakewater 0 0 h 0 h
United Utilities Revidge Road/Preston New Road Arley Brook 0 0 h -
United Utilities Ramsgreave Drive CSO River Blakewater 0 0 h -
United Utilities Revidge Road/Preston New Road Arley Brook 0 0 h -
United Utilities Grimshaw Park CSO River Blakewater 0 0 h 0 h
United Utilities VICTORIA STREET CSO River Blakewater 0 0 h -
United Utilities NOTRE DAME GARDENS CSO River Blakewater 0 0 h -
United Utilities BROWNHILL DRIVE CSO River Blakewater 0 0 h -
United Utilities DAISY LANE CSO River Blakewater 0 0 h -
United Utilities 293 PRESTON OLD ROAD CSO River Darwen 0 0 h 19 h
United Utilities Whalley Range CSO River Blakewater 0 0 h -
United Utilities Great Bolton Street CSO River Blakewater 0 0 h -
United Utilities Preston Old Road CSO River Blakewater 0 0 h -
United Utilities Lark Hill/Brook House Lane CSO River Blakewater 0 0 h -
United Utilities Infirmary Street CSO Leeds/Liverpool Canal 0 0 h -
United Utilities DAISY LANE CSO River Blakewater 0 0 h -

Data Sources & Accuracy

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.