Bolton West - 2025 Sewage

Polluted by sewage 2,400 hours in 2025 , monitoring offline 3,670 hours , potential overflows 3,746 hours

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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 West 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.

Totals for Bolton West in 2025

Sewage2,400 hours
Monitoring offline3,670 hours
Potential pollution3,746 hours
Storm overflows56

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Daily Data

Jan - 503 hours , 7 potential
Feb - 18 hours , 53 potential
Mar - 0 hours , 744 potential
Apr - 19 hours , 980 potential
May - 33 hours , 744 potential
Jun - 59 hours , 720 potential
Jul - 54 hours , 473 potential
Aug - 26 hours , 335 offline
Sept - 417 hours , 21 potential
Oct - 262 hours , 1 potential
Nov - 396 hours , 1 potential
Dec - 608 hours , 1 offline
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Totals so far

Company Site Name Receiving Waterway Overflow Days Total Duration (hours) Offline/Potential Pollution
United Utilities WESTHOUGHTON WwTW Hall Lee Brook 62 495h 37m 102 h
United Utilities WESTHOUGHTON WwTW Hall Lee Brook 20 219h 34m -
United Utilities HORWICH WwTW Pearl Brook 26 147h 45m 284 h
United Utilities CHORLEY NEW ROAD / DEVONSHIRE ROAD CSO Middle Brook 16 131h 2m -
United Utilities CHORLEY NEW ROAD / DEVONSHIRE ROAD CSO Middle Brook 33 123h 27m 1 h
United Utilities HORWICH WwTW Pearl Brook 15 114h 43m 27 h
United Utilities ALBION TERRACE CSO Astley Brook 18 105h 22m -
United Utilities Chorley Old Road/Chorley New Road CSO Astley Brook 57 101h 4m 0 h
United Utilities ALBION TERRACE CSO Astley Brook 42 101h 2m 1 h
United Utilities WESTHOUGHTON WwTW Hall Lee Brook 36 100h 33m 104 h
United Utilities Wood Barn Farm CSO Unnamed River Douglas 37 70h 43m 1 h
United Utilities Regent Road Bessy Brook Via Sws 26 68h 40m -
United Utilities HORWICH WwTW Pearl Brook 10 63h 16m -
United Utilities PARK HALL FARM CSO Middle Brook 32 58h 10m 224 h
United Utilities HORWICH WwTW Pearl Brook 7 54h 29m -
United Utilities Ladybridge Lane (Near Ladybridge Brow) CSO Middle Brook 18 48h 36m 8 h
United Utilities Harrisons Road Wagon & Horses CSO River Tame 29 45h 44m -
United Utilities Ash Grove/Southfield Drive CSO Culverted Cunningham Brk 18 43h 40m -
United Utilities Thompson Road Combined Sewer Overflow (Site ID 07055) (BOL0053) Captains Clough 12 37h 23m 3,454 h
United Utilities Chorley Old Road/Chorley New Road CSO Astley Brook 13 33h 18m -
United Utilities WESTHOUGHTON WwTW Hall Lee Brook 7 30h 10m -
United Utilities Chorley New Road/Beaumont Road CSO Pearl Brook 19 27h 20m 10 h
United Utilities GISBURN AVENUE CSO Astley Brook 15 20h 46m 0 h
United Utilities CHORLEY NEW ROAD CSO Middle Brook 13 20h 45m -
United Utilities PARK HALL FARM CSO Middle Brook 8 20h 40m 0 h
United Utilities Ladybridge Lane CSO Middle Brook 5 19h 21m 1 h
United Utilities Chorley New Road/Beaumont Road CSO Pearl Brook 6 17h 24m 0 h
United Utilities Wood Barn Farm CSO Unnamed River Douglas 7 13h 37m 0 h
United Utilities Ladybridge Lane (Near Ladybridge Brow) CSO Middle Brook 4 12h 28m -
United Utilities St Johns Road CSO Middle Brook 2 10h 58m -
United Utilities Junction of Manchester/Station Road CSO Middle Brook 6 8h 24m 1 h
United Utilities Regent Road Bessy Brook Via Sws 6 7h 6m -
United Utilities Moss Bank Way/Chippings Road CSO Astley Brook 2 6h 24m 11 h
United Utilities Heaton Bridge CSO Middle Brook 7 5h 54m 0 h
United Utilities Harrisons Road Wagon & Horses CSO River Tame 5 5h 12m -
United Utilities Manchester Road/Hope Street CSO River Croal 3 4h 52m 1,359 h
United Utilities Ash Grove/Southfield Drive CSO Culverted Cunningham Brk 2 2h 10m -
United Utilities Downstream of No. 56 Barrow Bridge Road CSO Dean Brook 1 1h 40m -
United Utilities GISBURN AVENUE CSO Astley Brook 1 0h 30m -
United Utilities LIGHTBOUNDS ROAD / LOUVAINE AVENUE CSO Astley Brook 1 0h 18m -
United Utilities Junction of Manchester/Station Road CSO Middle Brook 1 0h 6m -
United Utilities CHORLEY NEW ROAD / TELFORD STREET CSO Middle Brook 1 0h 4m 8 h
United Utilities Heaton Bridge CSO Middle Brook 0 0h 0 h
United Utilities LIGHTBOUNDS ROAD / LOUVAINE AVENUE CSO Astley Brook 0 0h -
United Utilities Moss Bank Way/Chippings Road CSO Astley Brook 0 0h -
United Utilities CHORLEY NEW ROAD / TELFORD STREET CSO Middle Brook 0 0h -
United Utilities Ladybridge Lane CSO Middle Brook 0 0h -
United Utilities Lostock Junction Lane CSO Bessy Brook 0 0h -
United Utilities Downstream of No. 56 Barrow Bridge Road CSO Dean Brook 0 0h -
United Utilities Thompson Road Combined Sewer Overflow (Site ID 07055) (BOL0053) Captains Clough 0 0h -
United Utilities Brook Dean Close (Smithhills Dean Road) Combined Sewer Overflow Dean Brook 0 0h 1,810 h
United Utilities Lostock Junction Lane CSO Bessy Brook 0 0h -
United Utilities Brook Dean Close (Smithhills Dean Road) Combined Sewer Overflow Dean Brook 0 0h 0 h
United Utilities St Johns Road CSO Middle Brook 0 0h -
United Utilities Manchester Road/Hope Street CSO River Croal 0 0h -
United Utilities CHORLEY NEW ROAD CSO Middle Brook 0 0h -

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

Annual figures up to and including 2025 come from official water company returns. The 2026 figure is our own estimate, derived continuously from the companies' live data feeds.

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.