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Bolton South and Walkden - 2025 Sewage

Polluted by sewage 4,775 hours in 2025 , monitoring offline 14,133 hours , potential overflows 202 hours

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

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View Annual Sewage Data

You're looking at the totals that we have calculated for sewage in Bolton South and Walkden 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.

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Daily Data

Jan - 958 hours , 60 potential
Feb - 86 hours , 5 potential
Mar - 11 hours , 20 offline
Apr - 6 hours , 0 potential
May - 98 hours , 2 potential
Jun - 130 hours , 4 potential
Jul - 57 hours , 1 potential
Aug - 96 hours , 2 potential
Sept - 677 hours , 56 potential
Oct - 632 hours , 56 potential
Nov - 905 hours , 8 potential
Dec - 1,112 hours , 4 potential
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Totals so far

Company Site Name Receiving Waterway Overflow Days Total Duration (hours) Offline/Potential Pollution
United Utilities BOLTON WwTW River Irwell 47 479 h 17m 4 h
United Utilities West of Hacken Works (Syphon) CSO River Croal 81 370 h 48m 12 h
United Utilities BOLTON WwTW River Irwell 39 322 h 56m -
United Utilities BOLTON WwTW River Irwell 19 298 h 14m -
United Utilities BOLTON WwTW River Irwell 19 295 h 53m -
United Utilities 91 Manchester Road CSO Croal Minor 91 231 h 54m 45 h
United Utilities Clammerclough CSO River Croal 70 204 h 21m 2 h
United Utilities HULTON LANE ENDS WwTW Unity Brook 46 199 h 40m -
United Utilities WORSLEY WwTW Little Hulton Stream 57 176 h 7m 46 h
United Utilities WORSLEY WwTW Little Hulton Stream 21 168 h 58m -
United Utilities Weston Street CSO (073K8) Jenny Beck Culvert Via Surface Water Sewer 64 166 h 8m 920 h
United Utilities Adelaide Street CSO Manchester Ship Canal 48 165 h 31m 0 h
United Utilities No 76 Middle Brook CSO Middle Brook 69 129 h 32m 73 h
United Utilities Kearsley PS River Irwell 24 105 h 10m -
United Utilities West of Hacken Works (Syphon) CSO River Croal 14 102 h 36m -
United Utilities HULTON LANE ENDS WwTW Unity Brook 15 99 h 30m -
United Utilities Singing Clough CSO Clvrt Singing Clough Brook 34 95 h 25m -
United Utilities 91 Manchester Road CSO Croal Minor 19 84 h 48m 5 h
United Utilities WORSLEY WwTW Little Hulton Stream 12 75 h 24m -
United Utilities Prestolee PS River Irwell 22 73 h 47m 2,276 h
United Utilities Weston Street/Viking Street CSO Jenny Beck Rvr Croal 35 72 h 21m -
United Utilities WORSLEY WwTW Little Hulton Stream 14 70 h 44m 0 h
United Utilities Stonehill Road CSO Culvrt Singing Clough Brook 17 63 h 30m 12 h
United Utilities Clammerclough CSO River Croal 16 62 h 38m 0 h
United Utilities Rishton Lane CSO Jenny Beck, Rv Croal 31 61 h 42m -
United Utilities Tynesbank CSO Ellen Brook Culvert 22 59 h 57m 1 h
United Utilities Adelaide Street CSO Manchester Ship Canal 11 57 h 56m -
United Utilities South of Ashawe Grove CSO Honksford Brook 15 50 h 58m -
United Utilities Stonehill Road CSO Culvrt Singing Clough Brook 15 40 h 15m -
United Utilities Weston Street CSO (073K8) Jenny Beck Culvert Via Surface Water Sewer 13 33 h 396 h
United Utilities Lever Street Number 3 CSO Jenny Beck 23 29 h 8m 15 h
United Utilities No 76 Middle Brook CSO Middle Brook 11 28 h 36m 2 h
United Utilities Kearsley PS River Irwell 3 26 h 54m -
United Utilities Blackshaw Lane CSO Middle Brook 19 25 h 10m 10 h
United Utilities Stonehill Road CSO Culvrt Singing Clough Brook 6 24 h 52m -
United Utilities Singing Clough CSO Clvrt Singing Clough Brook 5 20 h 17m -
United Utilities Weston Street/Viking Street CSO Jenny Beck Rvr Croal 10 18 h 54m -
United Utilities Orlando Street CSO Croal Minor 8 17 h 18m -
United Utilities Tynesbank CSO Ellen Brook Culvert 3 16 h 40m 0 h
United Utilities Walkden Road/Hoylake Road CSO Worsley Brook 8 12 h 2m -
United Utilities Stonehill Trading Estate CSO Singing Clough Brook 4 11 h 52m 43 h
United Utilities Hall Lane Combined Sewer Overflow (Site ID 07035) (BOL0145) River Croal 10 10 h 50m -
United Utilities Lever Street Number 3 CSO Jenny Beck 9 10 h 16m -
United Utilities Rishton Lane CSO Jenny Beck, Rv Croal 7 10 h 4m -
United Utilities CHURCH WHARF CSO Clvrt Sec River Croal Minor 13 9 h 50m 0 h
United Utilities St Peters Way/Springfield Industrial Estate CSO River Croal 15 9 h 26m -
United Utilities Manchester Road / Corrie Drive CSO (079DB) Unity Brook 18 9 h 25m -
United Utilities South of Ashawe Grove CSO Honksford Brook 5 8 h 28m -
United Utilities Singing Clough CSO Clvrt River Irwell 7 8 h 12m -
United Utilities ALBERT ROAD CSO Middle Brook 17 8 h 10m 14 h
United Utilities Stonehill Road CSO Culvrt Singing Clough Brook 2 8 h 2m -
United Utilities South of Ashawe Grove CSO Honksford Brook 2 5 h 34m 15 h
United Utilities Walkden Road/Hoylake Road CSO Worsley Brook 4 4 h 24m 1,224 h
United Utilities Lever Street Number 5 CSO Jenny Beck Rvr Croal 4 4 h 16m -
United Utilities Fern Street CSO River Croal 7 3 h 4m 1 h
United Utilities ALBERT ROAD CSO Middle Brook 5 2 h 44m -
United Utilities WORSLEY WwTW Little Hulton Stream 7 1 h 58m 0 h
United Utilities Stonehill Trading Estate CSO Singing Clough Brook 1 1 h 58m -
United Utilities LITTLE HULTON CSO Astley Brook 34 1 h 40m 1,812 h
United Utilities Singing Clough CSO Clvrt River Irwell 1 1 h 34m -
United Utilities Beech Grove CSO Honksford Brook Via Sws 1 1 h 18m 1,963 h
United Utilities Lever Street Number 1 CSO A Culverted Section Jenny Beck 2 1 h 12m 0 h
United Utilities CHURCH WHARF CSO Clvrt Sec River Croal Minor 2 0 h 40m -
United Utilities WORSLEY WwTW Little Hulton Stream 1 0 h 29m -
United Utilities CHURCH BANK / RAILWAY VIADUCT CSO Croal Minor 3 0 h 18m 1 h
United Utilities Bridgeman Park Combined Sewer Overflow River Croal 1 0 h 18m -
United Utilities Croft Lane / Manchester Road CSO Jenny Beck Culvert River Croal 1 0 h 12m -
United Utilities LITTLE HULTON CSO Astley Brook 1 0 h 2m -
United Utilities Blackshaw Lane CSO Middle Brook 1 0 h 2m 0 h
United Utilities Manchester Road / Corrie Drive CSO (079DB) Unity Brook 1 0 h 2m -
United Utilities Bridgeman Street/Higher Swan Lane CSO Jenny Beck 0 0 h 0 h
United Utilities Fern Street CSO River Croal 0 0 h -
United Utilities Orlando Street CSO Croal Minor 0 0 h -
United Utilities St Peters Way/Springfield Industrial Estate CSO River Croal 0 0 h -
United Utilities Church Bank (Side of Viaduct) Croal Minor 0 0 h -
United Utilities Riverside CSO River Irwell 0 0 h -
United Utilities Croft Lane / Manchester Road CSO Jenny Beck Culvert River Croal 0 0 h -
United Utilities Riverside CSO River Irwell 0 0 h -
United Utilities Beech Grove CSO Honksford Brook Via Sws 0 0 h 2,556 h
United Utilities Lever Street Number 1 CSO A Culverted Section Jenny Beck 0 0 h -
United Utilities Church Bank (Side of Viaduct) Croal Minor 0 0 h -
United Utilities CHURCH BANK / RAILWAY VIADUCT CSO Croal Minor 0 0 h 0 h
United Utilities Lever Street Number 5 CSO Jenny Beck Rvr Croal 0 0 h -
United Utilities Bridgeman Park Combined Sewer Overflow River Croal 0 0 h 0 h
United Utilities Bridgeman Street/Higher Swan Lane CSO Jenny Beck 0 0 h -
United Utilities Prestolee PS River Irwell 0 0 h 2,871 h
United Utilities Hall Lane Combined Sewer Overflow (Site ID 07035) (BOL0145) River Croal 0 0 h -
United Utilities South of Ashawe Grove CSO Honksford Brook 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.