Rossendale and Darwen was polluted by sewage 1,368 times in 2024
lasting 6,267 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 Rossendale and Darwen in 2025
So far this year (as of Apr 16, 2025, 6:15 PM) there has been 1,466 hours of sewage overflows
Totals for Rossendale and Darwen in 2024
56 Sites polluted by United Utilities
1,368 sewage dumps
6,267 h duration
That's 8.7 months. On average 3.7 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 Rossendale and Darwen, 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 Rossendale and Darwen 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 67 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 Irwell THE GLEN COMBINED SEWER OVERFLOW 152 1,544 99.9
United Utilities River Irwell ROSSENDALE WWTW 100 1,402 100
United Utilities River Irwell BACUP ROAD/FALBARN FOLD CSO 85 481 100
United Utilities Unknown BOLTON ROAD SSO 53 316 99
United Utilities River Spodden WHITWORTH CSO 53 290 100
United Utilities River Irwell 295 BACUP ROAD CSO 48 223 99.1
United Utilities River Irwell NEWCHURCH ROAD CSO (36013) 23 201 100
United Utilities River Irwell NEWCHURCH ROAD/BROOKS STREET CSO 61 184 99.3
United Utilities Limy Water R Irwell BANK ST COMBINED SEWER OVERFLOW 36 155 99.8
United Utilities Swinnel Brook HELMSHORE CARAVAN PARK CSO 40 136 99.9
United Utilities River Darwen DARWEN WWTW 12 115 100
United Utilities Whitewell Brook 143 BURNLEY ROAD EAST CSO 26 114 88.1
United Utilities Limy Water RUSHBED SSO 24 104 84.6
United Utilities River Darwen CLARENCE STREET CSO 46 101 98.8
United Utilities River Darwen HIGHER PERRY ST/BLACK LAUREL ST CSO 80 91 98.7
United Utilities Culverted Section River Darwen BALLE STREET HILTON STREET CSO 62 87 98.5
United Utilities River Irwell NEWCHURCH ROAD/WESLEY PLACE CSO 27 77 99.2
United Utilities River Irwell HIGHFIELD ROAD CSO 17 64 97.8
United Utilities Waterside Brook WATERSIDE CSO 052Z1 13 59 98.4
United Utilities River Darwen COTTON HALL STREET CSO 50 51 98.9
United Utilities River Irwell NEW HALL HEY ROAD CSO 13 50 100
United Utilities River Darwen BALLE STREET HILTON STREET CSO 49 48 98.4
United Utilities River Darwen ANYON STREET/LAUREL AVE CSO 44 42 98.8
United Utilities River Irwell WATERBARN LANE CSO 12 34 99.2
United Utilities River Darwen GRIMSHAW STREET CSO 21 30 100
United Utilities Quarlton Brook BROADHEAD ROAD CSO 051FX 15 29 98.9
United Utilities River Darwen SUDELL ROAD CSO 19 27 99.3
United Utilities River Ogden IRWELL VALE PS 9 25 17.1
United Utilities River Irwell HAMMERTONSTREET/STANLEY STREET CSO 13 23 89
United Utilities River Irwell BURNLEY ROAD BACUP CSO 5 16 99.2
United Utilities River Darwen 28 TYTHEBARN ST 14 13 100
United Utilities Whitewell Brook BURNLEY RD E/BOOTH ST CSO 22 13 99.1
United Utilities River Irwell NEWCHURCH ROAD BACUP CSO 9 12 99.4
United Utilities Unknown COWDE RD BR. 8 12 94.9
United Utilities River Darwen Via Sws HINDLE STREET CSO 18 10 99.2
United Utilities Whitewell Brook BURNLEY RD E /WHITEWELL BOTTOM CSO 3 9 96
United Utilities River Spodden WHITWORTH SSO 5 9 89.3
United Utilities Whitewll Brook BURNLEY ROAD EAST/SHAWCLOUGH CSO 2 7 46.6
United Utilities Kebbs Brook, Riv Darwen BOLTON ROAD/ASTLEY STREET CSO 13 6 100
United Utilities River Darwen BOLTON ROAD CSO 13 6 100
United Utilities River Darwen CRANBERRY LANE CSO 5 4 99.2
United Utilities River Irwell 709 BACUP ROAD CSO 3 4 97
United Utilities River Irwell BLACKWOOD ROAD CSO 3 3 99.6
United Utilities River Irwell SOUTH STREET/PICKUP STREET CSO 6 3 99.3
United Utilities Whitewell Brook BURNLEY ROAD EAST/TOWNLEY ARMS CSO 2 2 99
United Utilities River Darwen FOOTPATH NR CROSS ST CSO 2 2 95.9
United Utilities River Irwell LEE ROAD CSO (369BA) 2 2 99.5
United Utilities Greave Clough Via Sws GREAVE CLOUGH DRIVE CSO 2 1 99.3
United Utilities River Darwen KAY STREET CSO 7 1 99.3
United Utilities River Irwell ROCKLIFFE ROAD/RIVER STREET CSO 6 1 99.2
United Utilities River Spodden STATION ROAD (WHITWORTH) CSO 4 1 99.6
United Utilities Culverted Langwood Brook MANCHESTER RD CSO (363F2) 2 0 99.4
United Utilities Culverted Section River Darwen CHURCH STREET/PARLIAMENT STREET CSO 4 0 99.3
United Utilities River Darwen VALE STREET 2 0 99.9
United Utilities River Darwen REDEARTH ROAD/SUDELL ROAD CSO 2 0 99.6
United Utilities River Irwell NEW HALL HEY BRIDGE CSO 1 0 99.5
United Utilities Eagley Brook BELMONT WWTW 0 0 100
United Utilities Clvrtd Section Of River Darwen RAILWAY ROAD/SOUTH STREET CSO 0 0 99.2
United Utilities Whitewell Brook 876 BURNLEY RD EAST CSO 0 0 99.3
United Utilities River Darwen BOLTON ROAD CSO 0 0 99.3
United Utilities River Darwen BELGRAVE ROAD CSO 0 0 99.3
United Utilities Culverted River Irwell WELLINGTON HOTEL CSO 0 0 99.2
United Utilities Limy Water Irwell BURNLEY RD/MIDDLEGATE CSO 0 0 81.1
United Utilities Gleave Clough Brook TONG LANE/REED STREET CSO 0 0 99.2
United Utilities River Darwen SUDELLSIDE STREET 0 0 93
United Utilities River Darwen QUEENS ROAD (DARWEN) CSO 0 0 100
United Utilities River Darwen WOODVALE FLATS CSO 0 0 95.5

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.