Polluted by sewage 5,802 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 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.
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Donate Now| Company | Site Name | Receiving Waterway | Overflow Days | Total Duration (hours) | Total Duration (days) |
|---|---|---|---|---|---|
| United Utilities | The Glen CSO | River Irwell | 107 | 949 h 46m | 39.54 |
| United Utilities | ROSSENDALE WwTW | River Irwell | 60 | 811 h 35m | 33.79 |
| United Utilities | The Glen CSO | River Irwell | 27 | 433 h 14m | 18.04 |
| United Utilities | ROSSENDALE WwTW | River Irwell | 24 | 393 h 58m | 16.38 |
| United Utilities | 295 BACUP ROAD CSO | River Irwell | 22 | 274 h 24m | 11.42 |
| United Utilities | 295 BACUP ROAD CSO | River Irwell | 47 | 197 h 46m | 8.21 |
| United Utilities | Bolton Road CSO | Bradshaw Brook | 35 | 191 h 38m | 7.96 |
| United Utilities | Lower Eccleshill Road CSO | River Darwen | 25 | 184 h 53m | 7.67 |
| United Utilities | 100Metres East of No. XX Eastgate CSO | River Spodden | 36 | 181 h 41m | 7.54 |
| United Utilities | Bacup Road/Markross Street CSO | River Irwell | 37 | 148 h 48m | 6.17 |
| United Utilities | Lower Eccleshill Road CSO | River Darwen | 16 | 139 h 29m | 5.79 |
| United Utilities | Newchurch Road CSO | River Irwell | 15 | 118 h 39m | 4.92 |
| United Utilities | Newchurch Road CSO | River Irwell | 11 | 107 h | 4.46 |
| United Utilities | Bolton Road CSO | Bradshaw Brook | 13 | 106 h 26m | 4.42 |
| United Utilities | NEWCHURCH ROAD / BROOKS STREET CSO | River Irwell | 37 | 98 h 56m | 4.08 |
| United Utilities | Bank Street CSO | Limy Water R Irwell | 32 | 94 h 48m | 3.92 |
| United Utilities | 143 Burnley Road East CSO | Whitewell Brook | 20 | 86 h 22m | 3.58 |
| United Utilities | 100Metres East of No. XX Eastgate CSO | River Spodden | 14 | 82 h 3m | 3.42 |
| United Utilities | Helmshore Caravan Park combined sewer overflow | Swinnel Brook | 31 | 81 h 37m | 3.38 |
| United Utilities | New Hall Hey Road CSO | River Irwell | 20 | 68 h 18m | 2.83 |
| United Utilities | NEWCHURCH ROAD / BROOKS STREET CSO | River Irwell | 15 | 61 h | 2.54 |
| United Utilities | Clarence Street CSO | River Darwen | 30 | 60 h 55m | 2.5 |
| United Utilities | ANYON STREET / LAUREL AVENUE CSO | River Darwen | 40 | 59 h 48m | 2.46 |
| United Utilities | Rushbed SSO | Limy Water | 13 | 50 h 18m | 2.08 |
| United Utilities | NEWCHURCH ROAD / WESLEY PLACE CSO | River Irwell | 22 | 49 h 18m | 2.04 |
| United Utilities | Balle Street CSO No.X | River Darwen | 38 | 49 h 8m | 2.04 |
| United Utilities | Bank Street CSO | Limy Water R Irwell | 12 | 48 h 4m | 2 |
| United Utilities | HIGHER PERRY STREET/BACK LAUREL CSO | River Darwen | 44 | 47 h 42m | 1.96 |
| United Utilities | ANYON STREET / LAUREL AVENUE CSO | River Darwen | 15 | 46 h 52m | 1.92 |
| United Utilities | New Hall Hey Road CSO | River Irwell | 10 | 43 h 14m | 1.79 |
| United Utilities | 143 Burnley Road East CSO | Whitewell Brook | 6 | 36 h | 1.5 |
| United Utilities | Waterside CSO | Waterside Brook | 8 | 33 h 42m | 1.38 |
| United Utilities | Grimshaw Street Combined Sewer Overflow (Site ID 05033) (BBN0107) | River Darwen | 20 | 32 h 12m | 1.33 |
| United Utilities | BALLE STREET / HILTON STREET CSO | River Darwen | 30 | 30 h 2m | 1.25 |
| United Utilities | WATERBARN LANE CSO | River Irwell | 6 | 26 h 48m | 1.08 |
| United Utilities | Highfield Road CSO | River Irwell | 9 | 26 h 31m | 1.08 |
| United Utilities | COTTON HALL STREET CSO | River Darwen | 30 | 26 h 22m | 1.08 |
| United Utilities | Helmshore Caravan Park combined sewer overflow | Swinnel Brook | 12 | 22 h 6m | 0.92 |
| United Utilities | Sudell Road CSO | River Darwen | 19 | 21 h 26m | 0.88 |
| United Utilities | Bacup Road/Markross Street CSO | River Irwell | 10 | 20 h 5m | 0.83 |
| United Utilities | HIGHER PERRY STREET/BACK LAUREL CSO | River Darwen | 12 | 18 h 42m | 0.75 |
| United Utilities | NEWCHURCH ROAD / WESLEY PLACE CSO | River Irwell | 8 | 17 h 26m | 0.71 |
| United Utilities | Hindle Street CSO | River Darwen Via Sws | 10 | 16 h 26m | 0.67 |
| United Utilities | 28 Tythebarn Street CSO | River Darwen | 13 | 15 h 45m | 0.62 |
| United Utilities | Burnley Road East/Booth Street CSO | Whitewell Brook | 15 | 12 h 42m | 0.5 |
| United Utilities | COTTON HALL STREET CSO | River Darwen | 11 | 12 h 2m | 0.5 |
| United Utilities | Balle Street CSO No.X | River Darwen | 10 | 11 h 22m | 0.46 |
| United Utilities | BROADHEAD ROAD CSO | Quarlton Brook | 7 | 11 h 18m | 0.46 |
| United Utilities | Cowm Park Way South | River Spodden | 3 | 11 h 14m | 0.46 |
| United Utilities | Clarence Street CSO | River Darwen | 8 | 11 h 12m | 0.46 |
| United Utilities | Irwell Vale PS | River Ogden | 5 | 10 h 12m | 0.42 |
| United Utilities | Highfield Road CSO | River Irwell | 5 | 10 h 8m | 0.42 |
| United Utilities | BALLE STREET / HILTON STREET CSO | River Darwen | 8 | 9 h 36m | 0.38 |
| United Utilities | NEWCHURCH ROAD (Bacup) CSO | River Irwell | 5 | 9 h 4m | 0.38 |
| United Utilities | Hammerton Street/Stanley Street CSO | River Irwell | 7 | 8 h 34m | 0.33 |
| United Utilities | BURNLEY ROAD (BACUP) CSO | River Irwell | 3 | 8 h 32m | 0.33 |
| United Utilities | Cowpe Road SSO | River Irwell | 6 | 7 h 38m | 0.29 |
| United Utilities | Station Road (Whitworth) CSO | River Spodden | 3 | 7 h 36m | 0.29 |
| United Utilities | Cranberry Lane CSO | River Darwen | 4 | 7 h 18m | 0.29 |
| United Utilities | OPPOSITE 709 BACUP ROAD CSO | River Irwell | 3 | 4 h 36m | 0.17 |
| United Utilities | Burnley Road East/Booth Street CSO | Whitewell Brook | 2 | 4 h 4m | 0.17 |
| United Utilities | Rushbed SSO | Limy Water | 2 | 3 h 46m | 0.12 |
| United Utilities | Waterside CSO | Waterside Brook | 4 | 3 h 44m | 0.12 |
| United Utilities | Bolton Road/ Astley Street CSO | Kebbs Brook, Riv Darwen | 11 | 3 h 15m | 0.12 |
| United Utilities | ROCKCLIFFE ROAD / RIVER STREET CSO | River Irwell | 2 | 3 h 14m | 0.12 |
| United Utilities | Burnley Road East/Whitewall Bottom CSO | Whitewell Brook | 2 | 2 h 58m | 0.08 |
| United Utilities | Sudell Road CSO | River Darwen | 4 | 2 h 6m | 0.08 |
| United Utilities | CHURCH STREET / PARLIAMENT STREEET CSO | Culverted Section River Darwen | 7 | 2 h 6m | 0.08 |
| United Utilities | SOUTH STREET / PICKUP STREET CSO | River Irwell | 5 | 1 h 32m | 0.04 |
| United Utilities | Grimshaw Street Combined Sewer Overflow (Site ID 05033) (BBN0107) | River Darwen | 3 | 1 h 30m | 0.04 |
| United Utilities | Lee Road CSO | River Irwell | 2 | 1 h 20m | 0.04 |
| United Utilities | WATERBARN LANE CSO | River Irwell | 3 | 1 h 18m | 0.04 |
| United Utilities | Kay Street | River Darwen | 1 | 1 h 4m | 0.04 |
| United Utilities | Burnley Road East/Shawclough Road CSO | Whitewll Brook | 1 | 1 h 2m | 0.04 |
| United Utilities | Vale Street | River Darwen | 1 | 0 h 56m | 0 |
| United Utilities | NEWCHURCH ROAD (Bacup) CSO | River Irwell | 1 | 0 h 52m | 0 |
| United Utilities | Burnley Road/Middlegate CSO | Limy Water Irwell | 13 | 0 h 38m | 0 |
| United Utilities | REDEARTH ROAD / SUDELL ROAD CSO | River Darwen | 2 | 0 h 36m | 0 |
| United Utilities | Bolton Road CSO | River Darwen | 2 | 0 h 36m | 0 |
| United Utilities | Footpath Near Cross Street CSO | River Darwen | 1 | 0 h 34m | 0 |
| United Utilities | Burnley Road East/Townley Arms CSO | Whitewell Brook | 7 | 0 h 14m | 0 |
| United Utilities | Bolton Road/ Astley Street CSO | Kebbs Brook, Riv Darwen | 1 | 0 h 5m | 0 |
| United Utilities | BELMONT WwTW | Eagley Brook | 1 | 0 h 4m | 0 |
| United Utilities | 28 Tythebarn Street CSO | River Darwen | 1 | 0 h 4m | 0 |
| United Utilities | BROADHEAD ROAD CSO | Quarlton Brook | 1 | 0 h 2m | 0 |
| United Utilities | CHURCH STREET / PARLIAMENT STREEET CSO | Culverted Section River Darwen | 1 | 0 h 2m | 0 |
| United Utilities | Belgrave Road CSO | River Darwen | 1 | 0 h 2m | 0 |
| United Utilities | Hindle Street CSO | River Darwen Via Sws | 1 | 0 h 2m | 0 |
| United Utilities | 876 Burnley Road East CSO | Whitewell Brook | 0 | 0 h | 0 |
| United Utilities | ROCKCLIFFE ROAD / RIVER STREET CSO | River Irwell | 0 | 0 h | 0 |
| United Utilities | Burnley Road East/Townley Arms CSO | Whitewell Brook | 0 | 0 h | 0 |
| United Utilities | Burnley Road East/Shawclough Road CSO | Whitewll Brook | 0 | 0 h | 0 |
| United Utilities | OPPOSITE 709 BACUP ROAD CSO | River Irwell | 0 | 0 h | 0 |
| United Utilities | SOUTH STREET / PICKUP STREET CSO | River Irwell | 0 | 0 h | 0 |
| United Utilities | Woodvale Flats combined sewer overflow (059AF) (BBN0151) | River Darwen | 0 | 0 h | 0 |
| United Utilities | WELLINGTON HOTEL CSO | Culverted River Irwell | 0 | 0 h | 0 |
| United Utilities | Footpath Near Cross Street CSO | River Darwen | 0 | 0 h | 0 |
| United Utilities | Lee Road CSO | River Irwell | 0 | 0 h | 0 |
| United Utilities | BURNLEY ROAD (BACUP) CSO | River Irwell | 0 | 0 h | 0 |
| United Utilities | WELLINGTON HOTEL CSO | Culverted River Irwell | 0 | 0 h | 0 |
| United Utilities | Cranberry Lane CSO | River Darwen | 0 | 0 h | 0 |
| United Utilities | New Hall Hey Bridge CSO | River Irwell | 0 | 0 h | 0 |
| United Utilities | BELMONT WwTW | Eagley Brook | 0 | 0 h | 0 |
| United Utilities | Bolton Road CSO | River Darwen | 0 | 0 h | 0 |
| United Utilities | Sudellside Street CSO | River Darwen | 0 | 0 h | 0 |
| United Utilities | Belgrave Road CSO | River Darwen | 0 | 0 h | 0 |
| United Utilities | Greave Clough Drive CSO | Greave Clough Via Sws | 0 | 0 h | 0 |
| United Utilities | Vale Street | River Darwen | 0 | 0 h | 0 |
| United Utilities | Greave Clough Drive CSO | Greave Clough Via Sws | 0 | 0 h | 0 |
| United Utilities | Bolton Road CSO | River Darwen | 0 | 0 h | 0 |
| United Utilities | Cowpe Road SSO | River Irwell | 0 | 0 h | 0 |
| United Utilities | REDEARTH ROAD / SUDELL ROAD CSO | River Darwen | 0 | 0 h | 0 |
| United Utilities | Blackwood Road | River Irwell | 0 | 0 h | 0 |
| United Utilities | Sudellside Street CSO | River Darwen | 0 | 0 h | 0 |
| United Utilities | Blackwood Road | River Irwell | 0 | 0 h | 0 |
| United Utilities | RAILWAY ROAD / SOUTH STREET CSO | Clvrtd Section Of River Darwen | 0 | 0 h | 0 |
| United Utilities | Queen's Road CSO | River Darwen | 0 | 0 h | 0 |
| United Utilities | 876 Burnley Road East CSO | Whitewell Brook | 0 | 0 h | 0 |
| United Utilities | Woodvale Flats combined sewer overflow (059AF) (BBN0151) | River Darwen | 0 | 0 h | 0 |
| United Utilities | Irwell Vale PS | River Ogden | 0 | 0 h | 0 |
| United Utilities | TONG LANE / REED STREET CSO | Gleave Clough Brook | 0 | 0 h | 0 |
| United Utilities | Hammerton Street/Stanley Street CSO | River Irwell | 0 | 0 h | 0 |
| United Utilities | Cowm Park Way South | River Spodden | 0 | 0 h | 0 |
| United Utilities | Burnley Road East/Whitewall Bottom CSO | Whitewell Brook | 0 | 0 h | 0 |
| United Utilities | Boothfold Bridge CSO (369DI) | Whitewell Brook | 0 | 0 h | 0 |
| United Utilities | Kay Street | River Darwen | 0 | 0 h | 0 |
| United Utilities | RAILWAY ROAD / SOUTH STREET CSO | Clvrtd Section Of River Darwen | 0 | 0 h | 0 |
| United Utilities | Station Road (Whitworth) CSO | River Spodden | 0 | 0 h | 0 |
| United Utilities | Boothfold Bridge CSO (369DI) | Whitewell Brook | 0 | 0 h | 0 |
| United Utilities | New Hall Hey Bridge CSO | River Irwell | 0 | 0 h | 0 |
| United Utilities | Bolton Road CSO | River Darwen | 0 | 0 h | 0 |
| United Utilities | Burnley Road/Middlegate CSO | Limy Water Irwell | 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.