Chorley was polluted by sewage 1,328 times in 2024
lasting 6,532 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 Chorley in 2025
So far this year (as of Apr 16, 2025, 5:45 PM) there has been 1,474 hours of sewage overflows
Totals for Chorley in 2024
31 Sites polluted by United Utilities
1,328 sewage dumps
6,532 h duration
That's 9.07 months. On average 3.6 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 Chorley, 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 Chorley 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 32 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 Kyln Clough, R Lostock WITHNELL FOLD NETWORK PUMPING STATI 160 2,010 13.3
United Utilities River Douglas NR HARRISONS FARM 113 947 99.6
United Utilities Clancutt Brook MAVIS DRIVE 39 499 97.8
United Utilities River Yarrow CHORLEY LOWER WORKS PS 58 349 100
United Utilities River Yarrow COPPULL NEW RD/BUTTERWORTH RD CSO 106 341 99.3
United Utilities River Roddlesworth ABBEY VILLAGE PUMPING STATION 40 339 100
United Utilities River Lostock KERN MILL LANE CSO 122BI 41 292 98.8
United Utilities River Yarrow ADJ DUXBURY MILL P.S. CSO ID 12006 72 236 99.4
United Utilities River Chor O/S 8 HARDY DRIVE CSO 127 201 95.8
United Utilities Black Brook River Yarrow BAGANLEY FROOM CSO 121CW 40 193 98.2
United Utilities Sws To River Yarrow CLOVER ROAD BUTTERWORTH BROW CSO 71 177 99.6
United Utilities River Yarrow CHORLEY WASTE WATER TREATMENT WORKS 20 134 100
United Utilities Brinscall Brook LODGE BANK PUMPING STN 25 133 100
United Utilities Chapel Brook EARLS WAY CSO 12066 41 125 99.1
United Utilities Black Brook COWLING BROW CSO CHORL 62 120 99
United Utilities River Douglas HARRISON ROAD WAGON AND HORSE CSO 34 88 99.8
United Utilities Kenyon Brook OFF BRIDGE ST 10 65 100
United Utilities Bow Brook LANCASTER LANE CSO 12045 30 59 13.3
United Utilities Tanyard Brook HEWLETT AVENUE CSO 27 35 100
United Utilities River Douglas GRIMEFORD LANE PS 12007 15 33 100
United Utilities Plock Wood Stream EAVES GREEN RD CSO 29 28 99.1
United Utilities River Yarrow MOOR ROAD EAVES GREEN RD CSO 122GB 52 27 98.5
United Utilities River Chor River Yarrow PARKLANDS CSO 123JR CHR0015 48 24 90.3
United Utilities River Yarrow EAVES GREEN RD CSO 18 22 99.2
United Utilities River Chor LYDD GROVE PS 14 19 100
United Utilities Clvrted River Chor 96 COLLINGWOOD ROAD CSO 121PB 18 9 99.1
United Utilities River Yarrow CLOVER ROAD PUMPING STATION 7 7 100
United Utilities River Chor Diversion Channel COMMON BANK LANE CSO CHORL 3 3 100
United Utilities Black Brook, R Yarrow HEAPEY ROAD CSO 121YP 2 1 99.1
United Utilities River Yarrow LIMBRICK PUMPING STATION 5 0 99.9
United Utilities Ransnap Brook GLENCROFT PUMPING STATION 1 0 99.4
United Utilities River Chor FRIDAY STREET CSO 121UY 0 0 98.4

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.