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Polluted by sewage 1,834 hours in 2025
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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 Chester North and Neston, 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) |
|---|---|---|---|---|---|
| Dwr Cymru Welsh Water | Station Road Neston Storm Overflow | Dee Estuary | 66 | 354 h 15m | 14.75 |
| Dwr Cymru Welsh Water | Neston WwTW Storm Overflow | Stanney Brook | 51 | 270 h 45m | 11.25 |
| United Utilities | HOOTON ROAD CSO | Dibbinsdale Brook | 30 | 239 h | 9.96 |
| Dwr Cymru Welsh Water | Marshlands Road Little Neston Storm Overflow | River Dee | 40 | 228 h | 9.5 |
| Dwr Cymru Welsh Water | Dee Lane Chester Storm Overflow | River Dee | 49 | 166 h 15m | 6.92 |
| Dwr Cymru Welsh Water | Chester WwTW Settled Storm Overflow | Esturial Waters of the River Dee | 20 | 81 h 15m | 3.38 |
| Dwr Cymru Welsh Water | Castle Drive Chester Storm Overflow | River Dee | 29 | 70 h 30m | 2.92 |
| Dwr Cymru Welsh Water | Parkgate Road Chester Storm Overflow | Highfield Drain | 16 | 65 h 4m | 2.71 |
| Dwr Cymru Welsh Water | Chester Souter's Lane Storm Overflow | River Dee | 17 | 48 h 30m | 2 |
| Dwr Cymru Welsh Water | Willaston Mill Lane Storm Overflow | Unnamed Watercourse | 23 | 42 h 15m | 1.75 |
| Dwr Cymru Welsh Water | Wealstone Lane Chester Storm Overflow | Bache Brook | 21 | 39 h 22m | 1.62 |
| Dwr Cymru Welsh Water | Quayside Neston Storm Overflow | Dee Estuary | 21 | 33 h 30m | 1.38 |
| Dwr Cymru Welsh Water | Eldon Terrace Neston Storm Overflow | Stanney Brook | 16 | 32 h 30m | 1.33 |
| Dwr Cymru Welsh Water | Chester WwTW Inlet Storm Overflow | River Dee | 19 | 25 h 30m | 1.04 |
| Dwr Cymru Welsh Water | The Groves Storm Overflow | River Dee | 18 | 25 h 15m | 1.04 |
| Dwr Cymru Welsh Water | Near Dee Hills Park Chester Storm Overflow | River Dee | 5 | 24 h 10m | 1 |
| Dwr Cymru Welsh Water | Robert's Terrace Chester Storm Overflow | River Dee | 31 | 23 h 58m | 0.96 |
| United Utilities | HOOTON ROAD CSO | Dibbinsdale Brook | 7 | 19 h 22m | 0.79 |
| Dwr Cymru Welsh Water | Castle Drive Chester Overflow | River Dee | 29 | 13 h 52m | 0.54 |
| Dwr Cymru Welsh Water | Off Hermitage Road Saughall Storm Overflow | Tributary of the River Dee | 5 | 8 h 58m | 0.33 |
| Dwr Cymru Welsh Water | Seahill Road Saughall Storm Overflow | Garden City Drain | 6 | 7 h 45m | 0.29 |
| Dwr Cymru Welsh Water | Chester Road Neston Storm Overflow | Stanney Brook | 4 | 5 h 15m | 0.21 |
| Dwr Cymru Welsh Water | The Parade Neston Storm Overflow | Dee Estuary | 3 | 4 h 41m | 0.17 |
| Dwr Cymru Welsh Water | Cheyney Road Chester Overflow | Finchetts Gutter | 2 | 2 h 44m | 0.08 |
| Dwr Cymru Welsh Water | Moston Road Storm Overflow | Unnamed Watercourse | 1 | 0 h 30m | 0 |
| Dwr Cymru Welsh Water | Greenfields Drive Neston Storm Overflow | Dee Estuary | 1 | 0 h 30m | 0 |
| Dwr Cymru Welsh Water | Parkgate Road Earle Drive Storm Overflow | Dee Estuary | 1 | 0 h 15m | 0 |
| Dwr Cymru Welsh Water | Chester Daleside Storm Overflow | Tributary of Finchetts Gutter | 1 | 0 h 15m | 0 |
| Dwr Cymru Welsh Water | Unknown | Unknown | 1 | 0 h 15m | 0 |
| Dwr Cymru Welsh Water | Chester Park Court Storm Overflow | Bache Brook | 1 | 0 h 14m | 0 |
| United Utilities | Willaston Relief Sewer | Dibbinsdale Brook | 0 | 0 h | 0 |
| Dwr Cymru Welsh Water | Liverpool Road Chester Storm Overflow | Bache Brook | 0 | 0 h | 0 |
| Dwr Cymru Welsh Water | Gayton Parkways Storm Overflow | Tributary of River Dee | 0 | 0 h | 0 |
| Dwr Cymru Welsh Water | Dee Bridge Siphon Storm Overflow | River Dee | 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