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Polluted by sewage 4,974 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 Bolton South and Walkden, 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 | BOLTON WwTW | River Irwell | 47 | 479 h 17m | 19.96 |
| United Utilities | West of Hacken Works (Syphon) CSO | River Croal | 81 | 379 h 22m | 15.79 |
| United Utilities | BOLTON WwTW | River Irwell | 39 | 322 h 46m | 13.42 |
| United Utilities | BOLTON WwTW | River Irwell | 19 | 298 h 14m | 12.42 |
| United Utilities | BOLTON WwTW | River Irwell | 19 | 295 h 53m | 12.29 |
| United Utilities | 91 Manchester Road CSO | Croal Minor | 91 | 272 h 9m | 11.33 |
| United Utilities | WORSLEY WwTW | Little Hulton Stream | 59 | 214 h 25m | 8.92 |
| United Utilities | Clammerclough CSO | River Croal | 70 | 205 h 6m | 8.54 |
| United Utilities | HULTON LANE ENDS WwTW | Unity Brook | 46 | 199 h 40m | 8.29 |
| United Utilities | No 76 Middle Brook CSO | Middle Brook | 69 | 194 h 20m | 8.08 |
| United Utilities | Weston Street CSO (073K8) | Jenny Beck Culvert Via Surface Water Sewer | 64 | 189 h 58m | 7.88 |
| United Utilities | WORSLEY WwTW | Little Hulton Stream | 21 | 168 h 58m | 7 |
| United Utilities | Adelaide Street CSO | Manchester Ship Canal | 48 | 165 h 31m | 6.88 |
| United Utilities | Kearsley PS | River Irwell | 24 | 105 h 10m | 4.38 |
| United Utilities | West of Hacken Works (Syphon) CSO | River Croal | 14 | 102 h 36m | 4.25 |
| United Utilities | HULTON LANE ENDS WwTW | Unity Brook | 15 | 99 h 30m | 4.12 |
| United Utilities | Singing Clough CSO | Clvrt Singing Clough Brook | 34 | 95 h 25m | 3.96 |
| United Utilities | 91 Manchester Road CSO | Croal Minor | 19 | 89 h 8m | 3.71 |
| United Utilities | WORSLEY WwTW | Little Hulton Stream | 12 | 75 h 24m | 3.12 |
| United Utilities | Prestolee PS | River Irwell | 22 | 73 h 47m | 3.04 |
| United Utilities | Weston Street/Viking Street CSO | Jenny Beck Rvr Croal | 35 | 72 h 21m | 3 |
| United Utilities | WORSLEY WwTW | Little Hulton Stream | 14 | 70 h 36m | 2.92 |
| United Utilities | Stonehill Road CSO | Culvrt Singing Clough Brook | 17 | 69 h 2m | 2.88 |
| United Utilities | Clammerclough CSO | River Croal | 16 | 62 h 38m | 2.58 |
| United Utilities | Rishton Lane CSO | Jenny Beck, Rv Croal | 31 | 61 h 42m | 2.54 |
| United Utilities | Tynesbank CSO | Ellen Brook Culvert | 22 | 59 h 57m | 2.46 |
| United Utilities | Adelaide Street CSO | Manchester Ship Canal | 11 | 57 h 56m | 2.38 |
| United Utilities | South of Ashawe Grove CSO | Honksford Brook | 15 | 50 h 58m | 2.08 |
| United Utilities | Stonehill Road CSO | Culvrt Singing Clough Brook | 15 | 40 h 2m | 1.67 |
| United Utilities | Lever Street Number 3 CSO | Jenny Beck | 23 | 38 h 54m | 1.58 |
| United Utilities | Weston Street CSO (073K8) | Jenny Beck Culvert Via Surface Water Sewer | 13 | 33 h | 1.38 |
| United Utilities | No 76 Middle Brook CSO | Middle Brook | 11 | 29 h 18m | 1.21 |
| United Utilities | Blackshaw Lane CSO | Middle Brook | 19 | 28 h 52m | 1.17 |
| United Utilities | Kearsley PS | River Irwell | 3 | 26 h 54m | 1.08 |
| United Utilities | Stonehill Road CSO | Culvrt Singing Clough Brook | 6 | 24 h 52m | 1 |
| United Utilities | Singing Clough CSO | Clvrt Singing Clough Brook | 5 | 20 h 17m | 0.83 |
| United Utilities | Weston Street/Viking Street CSO | Jenny Beck Rvr Croal | 10 | 18 h 54m | 0.75 |
| United Utilities | Orlando Street CSO | Croal Minor | 8 | 17 h 18m | 0.71 |
| United Utilities | Tynesbank CSO | Ellen Brook Culvert | 3 | 16 h 40m | 0.67 |
| United Utilities | Walkden Road/Hoylake Road CSO | Worsley Brook | 8 | 12 h 2m | 0.5 |
| United Utilities | Stonehill Trading Estate CSO | Singing Clough Brook | 4 | 11 h 52m | 0.46 |
| United Utilities | Hall Lane Combined Sewer Overflow (Site ID 07035) (BOL0145) | River Croal | 10 | 10 h 48m | 0.42 |
| United Utilities | Lever Street Number 3 CSO | Jenny Beck | 9 | 10 h 16m | 0.42 |
| United Utilities | Rishton Lane CSO | Jenny Beck, Rv Croal | 7 | 10 h 4m | 0.42 |
| United Utilities | CHURCH WHARF CSO | Clvrt Sec River Croal Minor | 13 | 9 h 50m | 0.38 |
| United Utilities | St Peters Way/Springfield Industrial Estate CSO | River Croal | 15 | 9 h 26m | 0.38 |
| United Utilities | Manchester Road / Corrie Drive CSO (079DB) | Unity Brook | 18 | 9 h 25m | 0.38 |
| United Utilities | ALBERT ROAD CSO | Middle Brook | 17 | 8 h 28m | 0.33 |
| United Utilities | South of Ashawe Grove CSO | Honksford Brook | 5 | 8 h 28m | 0.33 |
| United Utilities | Singing Clough CSO | Clvrt River Irwell | 7 | 8 h 12m | 0.33 |
| United Utilities | Stonehill Road CSO | Culvrt Singing Clough Brook | 2 | 8 h 2m | 0.33 |
| United Utilities | South of Ashawe Grove CSO | Honksford Brook | 2 | 5 h 30m | 0.21 |
| United Utilities | Lever Street Number 5 CSO | Jenny Beck Rvr Croal | 4 | 4 h 16m | 0.17 |
| United Utilities | Walkden Road/Hoylake Road CSO | Worsley Brook | 4 | 3 h 54m | 0.12 |
| United Utilities | Fern Street CSO | River Croal | 7 | 3 h 4m | 0.12 |
| United Utilities | ALBERT ROAD CSO | Middle Brook | 5 | 2 h 44m | 0.08 |
| United Utilities | Stonehill Trading Estate CSO | Singing Clough Brook | 1 | 1 h 58m | 0.04 |
| United Utilities | WORSLEY WwTW | Little Hulton Stream | 7 | 1 h 49m | 0.04 |
| United Utilities | LITTLE HULTON CSO | Astley Brook | 34 | 1 h 36m | 0.04 |
| United Utilities | Singing Clough CSO | Clvrt River Irwell | 1 | 1 h 34m | 0.04 |
| United Utilities | Lever Street Number 1 CSO | A Culverted Section Jenny Beck | 2 | 1 h 12m | 0.04 |
| United Utilities | Beech Grove CSO | Honksford Brook Via Sws | 1 | 1 h 2m | 0.04 |
| United Utilities | CHURCH WHARF CSO | Clvrt Sec River Croal Minor | 2 | 0 h 40m | 0 |
| United Utilities | WORSLEY WwTW | Little Hulton Stream | 1 | 0 h 29m | 0 |
| United Utilities | CHURCH BANK / RAILWAY VIADUCT CSO | Croal Minor | 3 | 0 h 18m | 0 |
| United Utilities | Bridgeman Park Combined Sewer Overflow | River Croal | 1 | 0 h 18m | 0 |
| United Utilities | Croft Lane / Manchester Road CSO | Jenny Beck Culvert River Croal | 1 | 0 h 12m | 0 |
| United Utilities | Manchester Road / Corrie Drive CSO (079DB) | Unity Brook | 1 | 0 h 2m | 0 |
| United Utilities | Blackshaw Lane CSO | Middle Brook | 1 | 0 h 2m | 0 |
| United Utilities | LITTLE HULTON CSO | Astley Brook | 1 | 0 h 2m | 0 |
| United Utilities | Fern Street CSO | River Croal | 0 | 0 h | 0 |
| United Utilities | Croft Lane / Manchester Road CSO | Jenny Beck Culvert River Croal | 0 | 0 h | 0 |
| United Utilities | Orlando Street CSO | Croal Minor | 0 | 0 h | 0 |
| United Utilities | CHURCH BANK / RAILWAY VIADUCT CSO | Croal Minor | 0 | 0 h | 0 |
| United Utilities | Bridgeman Street/Higher Swan Lane CSO | Jenny Beck | 0 | 0 h | 0 |
| United Utilities | Riverside CSO | River Irwell | 0 | 0 h | 0 |
| United Utilities | Lever Street Number 1 CSO | A Culverted Section Jenny Beck | 0 | 0 h | 0 |
| United Utilities | Hall Lane Combined Sewer Overflow (Site ID 07035) (BOL0145) | River Croal | 0 | 0 h | 0 |
| United Utilities | Riverside CSO | River Irwell | 0 | 0 h | 0 |
| United Utilities | Church Bank (Side of Viaduct) | Croal Minor | 0 | 0 h | 0 |
| United Utilities | Church Bank (Side of Viaduct) | Croal Minor | 0 | 0 h | 0 |
| United Utilities | Bridgeman Park Combined Sewer Overflow | River Croal | 0 | 0 h | 0 |
| United Utilities | Bridgeman Street/Higher Swan Lane CSO | Jenny Beck | 0 | 0 h | 0 |
| United Utilities | South of Ashawe Grove CSO | Honksford Brook | 0 | 0 h | 0 |
| United Utilities | St Peters Way/Springfield Industrial Estate CSO | River Croal | 0 | 0 h | 0 |
| United Utilities | Lever Street Number 5 CSO | Jenny Beck Rvr Croal | 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