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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 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.
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Donate Now| Company | Site Name | Receiving Waterway | Overflow Days | Total Duration (hours) | Total Duration (days) |
|---|---|---|---|---|---|
| United Utilities | Withnell Fold PS | Kyln Clough, R Lostock | 66 | 648 h 7m | 27 |
| United Utilities | Near Harrison's Farm CSO | River Douglas | 42 | 461 h 2m | 19.21 |
| United Utilities | Chorley WwTW | River Yarrow | 29 | 436 h 40m | 18.17 |
| United Utilities | Withnell Fold PS | Kyln Clough, R Lostock | 24 | 315 h 30m | 13.12 |
| United Utilities | Near Harrison's Farm CSO | River Douglas | 19 | 279 h 59m | 11.62 |
| United Utilities | Coppull New Road/Butterworth Brow CSO | River Yarrow | 59 | 278 h 38m | 11.58 |
| United Utilities | Abbey Village Pumping Station (12001) (CHR0080) | River Roddlesworth | 36 | 239 h 40m | 9.96 |
| United Utilities | Lodge Bank PS | Brinscall Brook | 16 | 216 h 6m | 9 |
| United Utilities | Chorley Lower Works PS | River Yarrow | 38 | 192 h 15m | 8 |
| United Utilities | Coppull New Road/Butterworth Brow CSO | River Yarrow | 22 | 174 h 6m | 7.25 |
| United Utilities | O/S 8 HARDY DRIVE CSO | River Chor | 72 | 151 h 40m | 6.29 |
| United Utilities | Adjacent Duxbury Mill Pumping Station Combined Sewer Overflow (CHR0024) | River Yarrow | 50 | 123 h 28m | 5.12 |
| United Utilities | Mavis Drive CSO | Clancutt Brook | 7 | 98 h 44m | 4.08 |
| United Utilities | Abbey Village Pumping Station (12001) (CHR0080) | River Roddlesworth | 14 | 98 h 26m | 4.08 |
| United Utilities | Lodge Bank PS | Brinscall Brook | 17 | 91 h 10m | 3.79 |
| United Utilities | Earls Way CSO | Chapel Brook | 39 | 87 h 24m | 3.62 |
| United Utilities | Chorley Lower Works PS | River Yarrow | 11 | 73 h 31m | 3.04 |
| United Utilities | O/S 8 HARDY DRIVE CSO | River Chor | 18 | 71 h 10m | 2.96 |
| United Utilities | Cowling Brow CSO | Black Brook | 40 | 60 h 30m | 2.5 |
| United Utilities | Lancaster Lane CSO | Mill Brook | 33 | 57 h 50m | 2.38 |
| United Utilities | Adjacent Duxbury Mill Pumping Station Combined Sewer Overflow (CHR0024) | River Yarrow | 14 | 46 h 48m | 1.92 |
| United Utilities | Clover Road/Butterworth Brow CSO | Sws To River Yarrow | 23 | 35 h 27m | 1.46 |
| United Utilities | Earls Way CSO | Chapel Brook | 11 | 35 h 18m | 1.46 |
| United Utilities | Chorley WwTW | River Yarrow | 4 | 30 h 2m | 1.25 |
| United Utilities | Off Bridge Street PS | Kenyon Brook | 4 | 27 h 19m | 1.12 |
| United Utilities | Hewlett Avenue CSO | Tanyard Brook | 17 | 25 h 18m | 1.04 |
| United Utilities | Lydd Grove PS | River Chor | 8 | 19 h 2m | 0.79 |
| United Utilities | Eaves Green Brook CSO | River Yarrow | 10 | 17 h 34m | 0.71 |
| United Utilities | Kem Mill Lane CSO | River Lostock | 6 | 17 h | 0.71 |
| United Utilities | Moor Road/Eaves Green Road CSO | River Yarrow | 19 | 16 h 34m | 0.67 |
| United Utilities | Grimeford Lane PS | River Douglas | 3 | 15 h 58m | 0.62 |
| United Utilities | Baganley Froom CSO | Black Brook River Yarrow | 9 | 11 h 20m | 0.46 |
| United Utilities | Lancaster Lane CSO | Mill Brook | 9 | 10 h 12m | 0.42 |
| United Utilities | 96 COLLINGWOOD ROAD CSO | Clvrted River Chor | 10 | 9 h 12m | 0.38 |
| United Utilities | Cowling Brow CSO | Black Brook | 5 | 8 h 54m | 0.33 |
| United Utilities | Clover Road/Butterworth Brow CSO | Sws To River Yarrow | 8 | 8 h 12m | 0.33 |
| United Utilities | Common Bank Lane CSO | River Chor Diversion Channel | 2 | 8 h 2m | 0.33 |
| United Utilities | Eaves Green Road CSO | River Yarrow | 18 | 6 h 34m | 0.25 |
| United Utilities | Clover Road PS | River Yarrow | 3 | 6 h 19m | 0.25 |
| United Utilities | Parklands CSO | River Chor River Yarrow | 19 | 5 h 16m | 0.21 |
| United Utilities | Baganley Froom CSO | Black Brook River Yarrow | 3 | 1 h 24m | 0.04 |
| United Utilities | Eaves Green Road CSO | River Yarrow | 2 | 1 h 4m | 0.04 |
| United Utilities | Clover Road PS | River Yarrow | 1 | 0 h 43m | 0 |
| United Utilities | Moor Road/Eaves Green Road CSO | River Yarrow | 1 | 0 h 36m | 0 |
| United Utilities | Eaves Green Brook CSO | River Yarrow | 1 | 0 h 28m | 0 |
| United Utilities | Limbrick Pumping Station (12024) (CHR0030) | River Yarrow | 1 | 0 h 22m | 0 |
| United Utilities | Parklands CSO | River Chor River Yarrow | 2 | 0 h 4m | 0 |
| United Utilities | Limbrick Pumping Station (12024) (CHR0030) | River Yarrow | 1 | 0 h | 0 |
| United Utilities | Glencroft PS | Ransnap Brook | 0 | 0 h | 0 |
| United Utilities | Mavis Drive CSO | Clancutt Brook | 0 | 0 h | 0 |
| United Utilities | FRIDAY STREET CSO | River Chor | 0 | 0 h | 0 |
| United Utilities | Heapey CSO | Black Brook, R Yarrow | 0 | 0 h | 0 |
| United Utilities | 96 COLLINGWOOD ROAD CSO | Clvrted River Chor | 0 | 0 h | 0 |
| United Utilities | Duxbury Mill Farm PS | River Yarrow | 0 | 0 h | 0 |
| United Utilities | Heapey CSO | Black Brook, R Yarrow | 0 | 0 h | 0 |
| United Utilities | Grimeford Lane PS | River Douglas | 0 | 0 h | 0 |
| United Utilities | Lydd Grove PS | River Chor | 0 | 0 h | 0 |
| United Utilities | Common Bank Lane CSO | River Chor Diversion Channel | 0 | 0 h | 0 |
| United Utilities | Glencroft PS | Ransnap Brook | 0 | 0 h | 0 |
| United Utilities | Duxbury Mill Farm PS | River Yarrow | 0 | 0 h | 0 |
| United Utilities | Kem Mill Lane CSO | River Lostock | 0 | 0 h | 0 |
| United Utilities | Off Bridge Street PS | Kenyon Brook | 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