Blackburn was polluted by sewage 1,136 times in 2024
lasting 3,122 hours

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Contains OS Data © Crown copyright & database right 2021-2024
© Top of the Poops 2021-2024
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✔ means we have experimental daily data since 2023
Live data for Blackburn in 2025
So far this year (as of Apr 16, 2025, 5:45 PM) there has been 621 hours of sewage overflows
Totals for Blackburn in 2024
35 Sites polluted by United Utilities
1,136 sewage dumps
3,122 h duration
That's 4.34 months. On average 3.1 times a day
Change Over Time
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Daily Data
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.
     Monitoring Online      Monitoring Offline      Polluting      Potentially Polluting      Unknown
Daily data is experimental and data is not guaranteed to be accurate. Please inform us of any issue, we will fix.

Pollution Summary 2024

Here are all the reported sewage overflow totals for Blackburn in 2024. Sometimes sewage can be being dumped for months at a time.

Reporting refers to how much of the time the monitoring was active. In this constituency 0 of the total 44 CSO locations had reporting enabled for less than half the year, of which 0 had zero reporting.

Company Waterway Site Sewage Dumps Duration (Hours) Reporting %
United Utilities River Darwen AQUEDUCT ROAD CSO 71 568 99.1
United Utilities Culvert River Darwen SHARPLES STREET CSO 184 515 93.2
United Utilities Leeds/Liverpool Canal INFIRMARY STREET CSO 05050 28 276 92.9
United Utilities River Blakewater V Sws PHILIPS ROAD CSO (052LO) 133 276 98.3
United Utilities River Blakewater PHILIPS ROAD CSO 35 248 100
United Utilities Clvrt'D Section Knuzden Brook ACCRINGTON ROAD CSO 54 211 99.9
United Utilities River Blakewater LOWER AUDLEY CSO 55 164 99.6
United Utilities River Blakewater APPLEBY SREETT CSO 61 145 99.8
United Utilities Queens Park Culvert Via Sws CUMBERLAND STREET CSO 56 109 100
United Utilities River Blakewater THWAITES BREWERY YARD 43 106 9.8
United Utilities River Blakewater WITTON TANKS CSO 47 105 99.9
United Utilities Little Harwood Brook WHALLEY OLD RD/PROVIDENCE ST CSO 83 71 99.2
United Utilities River Blakewater ADDISON CLOSE CSO 36 64 13.3
United Utilities Queens Park Culvert DICKENS STREET CSO 26 62 100
United Utilities River Darwen BOLTON ROAD COMBINED SEWER OVERFLOW 54 59 100
United Utilities Queens Park Culvert QUEENS PARK ROAD CSO 19 48 99.9
United Utilities River Blakewater DUKES BROW CSO 38 20 99
United Utilities River Darwen GORSE ST COMBINED SEWER OVERFLOW 25 20 100
United Utilities River Blakewater GATE STREET CSO 24 15 96.1
United Utilities River Blakewater NEW MILL STREET CSO 6 14 97.7
United Utilities River Blakewater VICTORIA STREET CSO 26 5 99.3
United Utilities River Darwen CHERRY TREE WORKS SITE 6 3 99.2
United Utilities River Darwen 293 PRESTON OLD ROAD CSO (052M0) 1 1 99.4
United Utilities River Blakewater NOTRE DAME GARDENS CSO 2 1 99.3
United Utilities River Blakewater APPLE STREET CSO 6 0 99.3
United Utilities River Darwen WELLINGTON ROAD CSO 2 0 98.9
United Utilities River Blakewater BROWNHILL DRIVE CSO 1 0 99.4
United Utilities River Blakewater BEECHWOOD ROAD CSO 1 0 98.1
United Utilities River Blakewater WHALLEY RANGE/GRACE STREET CSO 4 0 94.8
United Utilities River Blakewater RAMSGREAVE DRIVE CSO 1 0 99.7
United Utilities River Blakewater Via Sws WHALLEY RANGE/MILLHAM STREET CSO 4 0 98.6
United Utilities River Blakewater FIELDEN STREET CSO 1 0 94
United Utilities River Blakewater 293 PRESTON OLD ROAD CSO (052M0) 1 0 100
United Utilities River Blakewater MANOR ROAD CSO (052ER) 1 0 99.3
United Utilities River Blakewater LARK HILL/BROOKHOUSE LANE CSO 1 0 87.5
United Utilities River Blakewater WHALLEY NEW ROAD CSO 0 0 99.3
United Utilities River Blakewater PRINGLE STREET CSO 0 0 40.2
United Utilities River Blakewater WHALLEY RANGE / WESLEY STREET CSO 0 0 96
United Utilities River Blakewater GREAT BOLTON STREET CSO 0 0 99.3
United Utilities Culvert Pringle St BACK QUEENS PARK RD 0 0 85.5
United Utilities Arley Brook REVIDGE RD/PRESTON NEW RD SSO 0 0 85
United Utilities River Blakewater DAISY LANE CSO 0 0 90.2
United Utilities Culvert Culvert St MERCHANTS LANDING CULVERT ST CSO 0 0 99.2
United Utilities River Blakewater GRIMSHAW PARK CSO 0 0 99.5

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. This 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.