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Polluted by sewage 539 times in 2025 lasting 1,504 hours
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Donate NowHere are all the reported sewage overflow totals for Chorley in 2025. 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 place all the declared CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway s appeared to have monitoring enabled for more than 50% of the year
| Company | Waterway | Site | Sewage Dumps | Duration (Hours) | Reporting % |
|---|---|---|---|---|---|
| United Utilities | River Yarrow | COPPULL NEW RD/BUTTERWORTH RD CSO | 83 | 421 | 99.7 |
| United Utilities | River Yarrow | CHORLEY LOWER WORKS PS | 48 | 265 | 99.8 |
| United Utilities | River Chor | O/S 8 HARDY DRIVE CSO | 99 | 196 | 99.1 |
| United Utilities | River Yarrow | ADJ DUXBURY MILL P.S. CSO ID 12006 | 61 | 171 | 99.9 |
| United Utilities | Chapel Brook | EARLS WAY CSO 12066 | 51 | 121 | 99.2 |
| United Utilities | River Yarrow | CHORLEY WASTE WATER TREATMENT WORKS | 18 | 105 | 95.7 |
| United Utilities | Black Brook | COWLING BROW CSO CHORL | 43 | 69 | 100 |
| United Utilities | Sws To River Yarrow | CLOVER ROAD BUTTERWORTH BROW CSO | 37 | 53 | 96.7 |
| United Utilities | River Chor | LYDD GROVE PS | 9 | 19 | 100 |
| United Utilities | River Yarrow | EAVES GREEN RD CSO | 12 | 19 | 96.8 |
| United Utilities | Plock Wood Stream | EAVES GREEN RD CSO | 24 | 11 | 99.5 |
| United Utilities | Black Brook River Yarrow | BAGANLEY FROOM CSO 121CW | 12 | 10 | 100 |
| United Utilities | River Yarrow | MOOR ROAD EAVES GREEN RD CSO 122GB | 23 | 9 | 99.8 |
| United Utilities | Clvrted River Chor | 96 COLLINGWOOD ROAD CSO 121PB | 10 | 8 | 99.9 |
| United Utilities | River Yarrow | CLOVER ROAD PUMPING STATION | 4 | 8 | 100 |
| United Utilities | River Chor Diversion Channel | COMMON BANK LANE CSO CHORL | 1 | 8 | 99.3 |
| United Utilities | River Chor River Yarrow | PARKLANDS CSO 123JR CHR0015 | 2 | 3 | 97.5 |
| United Utilities | River Yarrow | LIMBRICK PUMPING STATION | 2 | 0 | 99.9 |
| United Utilities | River Chor | FRIDAY STREET CSO 121UY | 0 | 0 | 96.8 |
| United Utilities | Black Brook, R Yarrow | HEAPEY ROAD CSO 121YP | 0 | 0 | 99.4 |
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.
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Get in touch if you have queries or want to discuss our data.
press [at] top-of-the-poops.org