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Polluted by sewage 4,024 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 Bassetlaw, 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) |
|---|---|---|---|---|---|
| Severn Trent Water | HODSOCK STW (SSTO) | Carlton Beck | 66 | 1,077 h 52m | 44.88 |
| Severn Trent Water | HODSOCK STW (SSTO) | Carlton Beck | 36 | 666 h 30m | 27.75 |
| Severn Trent Water | CRESWELL - CRAGS ROAD PS (CSO) | Millwood Brook - Creswell Arm | 38 | 343 h 28m | 14.29 |
| Severn Trent Water | RETFORD - BOLHAM LANE PS (CSO) | Carr Dyke | 22 | 272 h 19m | 11.33 |
| Severn Trent Water | WALKERINGHAM STW (SSTO) | River Trent | 17 | 184 h 13m | 7.67 |
| Severn Trent Water | RETFORD STW (SSTO) | River Idle | 14 | 150 h 14m | 6.25 |
| Severn Trent Water | NORTON (STW) | River Poulter | 22 | 109 h 24m | 4.54 |
| Severn Trent Water | WORKSOP - MANTON STW (SSTO) | River Ryton | 10 | 102 h 39m | 4.25 |
| Severn Trent Water | OLDCOTES - BLYTH ROAD (SSO) | Radford Brook | 8 | 94 h 48m | 3.92 |
| Severn Trent Water | NETHER LANGWITH STW (SSTO) | River Poulter | 13 | 92 h 2m | 3.83 |
| Severn Trent Water | WORKSOP - MANTON STW 6DWF (CSO) | River Ryton | 32 | 88 h 35m | 3.67 |
| Severn Trent Water | HARWORTH STW (SSTO) | Harworth Sewage Dyke | 11 | 83 h 35m | 3.46 |
| Severn Trent Water | NETHER LANGWITH - MAIN ROAD (CSO) | River Poulter | 28 | 70 h 21m | 2.92 |
| Severn Trent Water | LANGWITH - THE WOODLANDS (CSO&EO) | Dry Ditch | 8 | 69 h | 2.88 |
| Severn Trent Water | BECKINGHAM - TETHERING GRASS LANE (SSO) | Tetheringrass Drain | 9 | 66 h 41m | 2.75 |
| Severn Trent Water | WORKSOP - MANTON STW (SSTO) | River Ryton | 7 | 57 h 59m | 2.38 |
| Severn Trent Water | RETFORD STW (SSTO) | River Idle | 8 | 53 h 50m | 2.21 |
| Severn Trent Water | CARLTON IN LINDRICK -WATER LA FOUL (SSO) | Walling Wells Brook | 8 | 53 h 44m | 2.21 |
| Severn Trent Water | BECKINGHAM - TETHERING GRASS LANE (SSO) | Tetheringrass Drain | 10 | 53 h 22m | 2.21 |
| Severn Trent Water | HARWORTH - CHURCH ENTRANCE (SSO) | Harworth Dyke | 11 | 47 h 53m | 1.96 |
| Severn Trent Water | WHALEY THORNS - MAIN RD/LIMES AVE (SO) | River Poulter | 43 | 32 h 53m | 1.33 |
| Severn Trent Water | CRESWELL - CRAGS ROAD PS (CSO) | Millwood Brook - Creswell Arm | 9 | 24 h 26m | 1 |
| Severn Trent Water | HARWORTH STW (CSO) | Harworth Sewage Dyke | 17 | 24 h 12m | 1 |
| Severn Trent Water | RETFORD - KINGS PARK (CSO) | River Idle/Maun/Carr Dyke | 2 | 22 h 10m | 0.92 |
| Severn Trent Water | RANSKILL STW (SSTO) | Ranskill Brook | 5 | 21 h 37m | 0.88 |
| Severn Trent Water | MATTERSEY THORPE (STW) | River Idle | 3 | 21 h 7m | 0.88 |
| Severn Trent Water | HARWORTH - CHURCH WALK (CSO) | Harworth Sewage Dike | 4 | 19 h 50m | 0.79 |
| Severn Trent Water | NETHER LANGWITH STW (SSTO) | River Poulter | 4 | 18 h 22m | 0.75 |
| Severn Trent Water | RETFORD - BOLHAM LANE PS (CSO) | Carr Dyke | 3 | 16 h 45m | 0.67 |
| Severn Trent Water | NETHER LANGWITH - MAIN ROAD (CSO) | River Poulter | 9 | 15 h 8m | 0.62 |
| Severn Trent Water | BLYTH NORNAY - BAWTRY ROAD (SSO) | Oldcoates Dyke | 7 | 14 h 25m | 0.58 |
| Severn Trent Water | WALKERINGHAM STW (SSTO) | River Trent | 2 | 12 h 25m | 0.5 |
| Severn Trent Water | WORKSOP - EASTGATE (CSO) | River Ryton | 10 | 9 h 40m | 0.38 |
| Severn Trent Water | BLYTH - BAWTRY ROAD (SSO) | River Ryton | 3 | 7 h 2m | 0.29 |
| Severn Trent Water | HARWORTH STW (CSO) | Harworth Sewage Dyke | 5 | 4 h 54m | 0.17 |
| Severn Trent Water | NORTON (STW) | River Poulter | 5 | 4 h 41m | 0.17 |
| Severn Trent Water | HARWORTH STW (SSTO) | Harworth Sewage Dyke | 1 | 3 h 55m | 0.12 |
| Severn Trent Water | RETFORD - KINGS PARK (CSO) | River Idle/Maun/Carr Dyke | 1 | 3 h 49m | 0.12 |
| Severn Trent Water | HARWORTH - CHURCH ENTRANCE (SSO) | Harworth Dyke | 1 | 2 h 24m | 0.08 |
| Severn Trent Water | WORKSOP - MANTON STW 6DWF (CSO) | River Ryton | 2 | 1 h 49m | 0.04 |
| Severn Trent Water | MATTERSEY - CHURCH HOUSE (SSO) | River Idle | 1 | 1 h 16m | 0.04 |
| Severn Trent Water | HARWORTH - CHURCH WALK (CSO) | Harworth Sewage Dike | 1 | 1 h 14m | 0.04 |
| Severn Trent Water | WORKSOP - EASTGATE (CSO) | River Ryton | 2 | 0 h 57m | 0 |
| Severn Trent Water | LONDON RD (CSO) | River Idle | 2 | 0 h 28m | 0 |
| Severn Trent Water | WORKSOP - KILTON HILL (CSO) | River Ryton | 1 | 0 h 7m | 0 |
| Severn Trent Water | BLYTH NORNAY - BAWTRY ROAD (SSO) | Oldcoates Dyke | 0 | 0 h | 0 |
| Severn Trent Water | MATTERSEY - CHURCH HOUSE (SSO) | River Idle | 0 | 0 h | 0 |
| Severn Trent Water | BLYTH - BAWTRY ROAD (SSO) | River Ryton | 0 | 0 h | 0 |
| Severn Trent Water | LANGWITH - THE WOODLANDS (CSO&EO) | Dry Ditch | 0 | 0 h | 0 |
| Severn Trent Water | RANSKILL STW (SSTO) | Ranskill Brook | 0 | 0 h | 0 |
| Severn Trent Water | LONDON RD (CSO) | River Idle | 0 | 0 h | 0 |
| Severn Trent Water | WORKSOP - KILTON HILL (CSO) | River Ryton | 0 | 0 h | 0 |
| Severn Trent Water | CARLTON IN LINDRICK -WATER LA FOUL (SSO) | Walling Wells Brook | 0 | 0 h | 0 |
| Severn Trent Water | MATTERSEY THORPE (STW) | River Idle | 0 | 0 h | 0 |
| Severn Trent Water | OLDCOTES - BLYTH ROAD (SSO) | Radford Brook | 0 | 0 h | 0 |
| Severn Trent Water | RETFORD - BRACKEN LANE (SSO) | Retford Beck | 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