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Polluted by sewage 11,368 hours in 2025 - That's 1.32 years
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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 Kenilworth and Southam, 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 | FENNY COMPTON STW (SSTO) | River Itchen | 109 | 2,127 h 38m | 88.62 |
| Severn Trent Water | FRANKTON STW (SSTO) | River Leam | 61 | 917 h 5m | 38.21 |
| Severn Trent Water | FINHAM - SSTO OVERFLOW-3PG-RIVER SOWE | River Sowe | 49 | 720 h 10m | 30 |
| Severn Trent Water | FRANKTON STW (SSTO) | River Leam | 28 | 538 h 15m | 22.42 |
| Severn Trent Water | LIGHTHORNE HEATH STW (SSTO) | Tach Brook | 37 | 463 h 43m | 19.29 |
| Severn Trent Water | ROWINGTON STW (CSO) | Kingswood Brook | 28 | 398 h 41m | 16.58 |
| Severn Trent Water | FENNY COMPTON STW (SSTO) | River Itchen | 23 | 386 h 7m | 16.08 |
| Severn Trent Water | ITCHEN BANK STW (SSTO) | River Itchen | 34 | 364 h 12m | 15.17 |
| Severn Trent Water | FINHAM - SSTO OVERFLOW-3PG-FINHAM BROOK | Finham Brook | 25 | 329 h 56m | 13.71 |
| Severn Trent Water | NORTHEND STW (CSO) | River Dene | 95 | 319 h 46m | 13.29 |
| Severn Trent Water | ROWINGTON STW (CSO) | Kingswood Brook | 20 | 269 h 43m | 11.21 |
| Thames Water | Farnborough STW | Hanwell Brook | 27 | 258 h | 10.75 |
| Severn Trent Water | ITCHEN BANK STW (SSTO) | River Itchen | 16 | 214 h 39m | 8.92 |
| Severn Trent Water | FINHAM - SSTO OVERFLOW-3PG-RIVER SOWE | River Sowe | 16 | 214 h 14m | 8.92 |
| Severn Trent Water | BUBBENHALL IPS (CSO) | River Avon | 13 | 210 h 52m | 8.75 |
| Severn Trent Water | WHATCOTE - CHURCH LANE (SSO) | Wagtail Brook | 15 | 195 h 40m | 8.12 |
| Severn Trent Water | BUBBENHALL IPS (CSO) | River Avon | 15 | 193 h 3m | 8.04 |
| Severn Trent Water | DORRIDGE - NORTON GREEN LANE (SSO) | Cuttle Brook | 21 | 179 h 1m | 7.46 |
| Severn Trent Water | NORTON GREEN STW (SSTO) | Grand Union Canal Stream | 14 | 174 h 32m | 7.25 |
| Thames Water | Farnborough STW | Hanwell Brook | 15 | 173 h 15m | 7.21 |
| Severn Trent Water | FINHAM - SSTO OVERFLOW-3PG-FINHAM BROOK | Finham Brook | 11 | 157 h 46m | 6.54 |
| Severn Trent Water | NORTON GREEN STW (SSTO) | Grand Union Canal Stream | 16 | 151 h 6m | 6.29 |
| Severn Trent Water | DORRIDGE - NORTON GREEN LANE (SSO) | Cuttle Brook | 11 | 134 h 50m | 5.58 |
| Severn Trent Water | KENILWORTH - DALEHOUSE LANE (SSO) | Finham Brook | 20 | 131 h 20m | 5.46 |
| Severn Trent Water | STOCKTON-NEW ZEALAND FM-NAPTON RD (CSO) | River Stowe | 19 | 128 h 26m | 5.33 |
| Severn Trent Water | SSTO OVERFLOW-3PG (SRBO) | River Stowe | 17 | 120 h 46m | 5 |
| Severn Trent Water | KINETON (STW) | River Dene | 13 | 116 h 53m | 4.83 |
| Thames Water | Warmington STW | Hanwell Brook | 25 | 108 h 15m | 4.5 |
| Severn Trent Water | LOWER TYSOE - STW (CSO) | Tysoe Brook | 84 | 101 h 17m | 4.21 |
| Severn Trent Water | LONG ITCHINGTON - STONEBRIDGE LANE (CSO) | River Itchen | 9 | 92 h 53m | 3.83 |
| Severn Trent Water | SOUTHAM - WATTONS LANE (CSO) | River Stowe | 10 | 82 h 37m | 3.42 |
| Severn Trent Water | LONG ITCHINGTON - STONEBRIDGE LANE (CSO) | River Itchen | 5 | 81 h 25m | 3.38 |
| Severn Trent Water | KINETON (STW) | River Dene | 7 | 79 h 55m | 3.29 |
| Severn Trent Water | STOCKTON-NEW ZEALAND FM-NAPTON RD (CSO) | River Stowe | 10 | 78 h 23m | 3.25 |
| Severn Trent Water | KENILWORTH - DALEHOUSE LANE (SSO) | Finham Brook | 5 | 67 h 50m | 2.79 |
| Severn Trent Water | SSTO OVERFLOW-3PG (SRBO) | River Stowe | 11 | 64 h 6m | 2.67 |
| Thames Water | Avon Dassett STW | Hanwell Brook | 9 | 63 h 45m | 2.62 |
| Severn Trent Water | BROADWELL - BROADWELL HOUSE SPS (CSO) | Millholme Brook | 5 | 63 h 37m | 2.62 |
| Severn Trent Water | CUBBINGTON - OFFCHURCH ROAD (SSO) | Pingle Brook | 11 | 60 h 15m | 2.5 |
| Severn Trent Water | SOUTHAM - WATTONS LANE (CSO) | River Stowe | 5 | 57 h 15m | 2.38 |
| Severn Trent Water | WHATCOTE - CHURCH LANE (SSO) | Wagtail Brook | 4 | 53 h 24m | 2.21 |
| Severn Trent Water | BASCOTE STW (CSO) | River Itchen | 7 | 49 h 30m | 2.04 |
| Severn Trent Water | HILL - A426 (SSO) | Slutwell Stream | 7 | 44 h 19m | 1.83 |
| Severn Trent Water | MORETON MORRELL STW (SSTO) | Charlecote Brook | 14 | 40 h 52m | 1.67 |
| Thames Water | Shotteswell STW | Hanwell Brook | 8 | 40 h 30m | 1.67 |
| Severn Trent Water | HARBURY - DEPPERS BRIDGE (CSO) | River Itchen | 5 | 40 h 14m | 1.67 |
| Severn Trent Water | STRETTON-ON-DUNSMORE TPS (CSO) | Princethorpe Brook | 8 | 37 h 13m | 1.54 |
| Severn Trent Water | KENILWORTH - WARWICK RD OPP. XXX (CSO) | Cattle Brook | 14 | 36 h 59m | 1.5 |
| Thames Water | Warmington STW | Hanwell Brook | 4 | 33 h 45m | 1.38 |
| Severn Trent Water | MORETON PADDOX (CSO) | River Avon | 4 | 32 h 9m | 1.33 |
| Thames Water | Avon Dassett STW | Hanwell Brook | 4 | 30 h | 1.25 |
| Severn Trent Water | CUBBINGTON - OFFCHURCH ROAD (SSO) | Pingle Brook | 5 | 29 h 39m | 1.21 |
| Severn Trent Water | MORETON PADDOX (CSO) | River Avon | 11 | 29 h 25m | 1.21 |
| Severn Trent Water | NORTHEND STW (CSO) | River Dene | 20 | 29 h 10m | 1.21 |
| Severn Trent Water | RYTON-ON-DUNSMORE - CHURCH ROAD (CSO) | River Avon | 6 | 26 h 36m | 1.08 |
| Severn Trent Water | STRETTON-ON-DUNSMORE TPS (CSO) | Princethorpe Brook | 3 | 21 h 14m | 0.88 |
| Severn Trent Water | LIGHTHORNE - MORTON MORRELL LANE (CSO) | Thelsford Brook | 2 | 19 h 25m | 0.79 |
| Severn Trent Water | HATTON - STATION RD (OAKSLADE FARM) (CSO) | Claverdon Brook | 4 | 18 h 57m | 0.75 |
| Severn Trent Water | BASCOTE STW (CSO) | River Itchen | 4 | 18 h 16m | 0.75 |
| Severn Trent Water | HILL - A426 (SSO) | Slutwell Stream | 3 | 16 h 44m | 0.67 |
| Severn Trent Water | LIGHTHORNE HEATH STW (SSTO) | Tach Brook | 3 | 16 h 3m | 0.67 |
| Thames Water | Shotteswell STW | Hanwell Brook | 2 | 15 h 30m | 0.62 |
| Severn Trent Water | KENILWORTH - WARWICK RD OPP. XXX (CSO) | Cattle Brook | 5 | 15 h 11m | 0.62 |
| Severn Trent Water | HARBURY - MILL STREET (SSO) | Radford Brook | 6 | 11 h 31m | 0.46 |
| Severn Trent Water | BROADWELL - BROADWELL HOUSE SPS (CSO) | Millholme Brook | 2 | 10 h 31m | 0.42 |
| Severn Trent Water | HATTON - STATION RD (OAKSLADE FARM) (CSO) | Claverdon Brook | 1 | 8 h 24m | 0.33 |
| Severn Trent Water | MORETON MORRELL STW (SSTO) | Charlecote Brook | 1 | 8 h 23m | 0.33 |
| Severn Trent Water | SOUTHAM - BANBURY ROAD (CSO) | River Stowe | 10 | 8 h 15m | 0.33 |
| Severn Trent Water | LIGHTHORNE - MORTON MORRELL LANE (CSO) | Thelsford Brook | 3 | 6 h 27m | 0.25 |
| Severn Trent Water | LOWER TYSOE - STW (CSO) | Tysoe Brook | 2 | 6 h 17m | 0.25 |
| Severn Trent Water | FRANKTON - MANOR FARM (SSO) | River Leam | 1 | 5 h 33m | 0.21 |
| Severn Trent Water | LITTLE KINETON - BRIDGE STREET (CSO) | River Dene | 4 | 4 h 31m | 0.17 |
| Severn Trent Water | KINETON - CASTLE CRESCENT (CSO) | River Dene | 1 | 4 h 27m | 0.17 |
| Severn Trent Water | FRANKTON - MANOR FARM (SSO) | River Leam | 2 | 3 h 12m | 0.12 |
| Severn Trent Water | RYTON-ON-DUNSMORE - CHURCH ROAD (CSO) | River Avon | 1 | 2 h 15m | 0.08 |
| Thames Water | Ratley STW | Sor Brook | 1 | 0 h 30m | 0 |
| Severn Trent Water | HARBURY - DEPPERS BRIDGE (CSO) | River Itchen | 1 | 0 h 29m | 0 |
| Severn Trent Water | KENILWORTH - THE CLOSE/MILL END (CSO) | Finham Brook | 1 | 0 h 21m | 0 |
| Severn Trent Water | DUNCHURCH (STW) | River Leam | 1 | 0 h 18m | 0 |
| Severn Trent Water | KINETON - SOUTHAM STREET (CSO) | River Dene | 1 | 0 h 6m | 0 |
| Severn Trent Water | KINETON - SOUTHAM STREET (CSO) | River Dene | 0 | 0 h | 0 |
| Severn Trent Water | FENNY COMPTON STW 6DWF (CSO) | River Itchen | 0 | 0 h | 0 |
| Severn Trent Water | UPPER TYSOE - SMARTS LANE (SSO) | Wagtail Brook | 0 | 0 h | 0 |
| Severn Trent Water | KINETON - BANBURY ROAD/MILL LANE (CSO) | River Dene | 0 | 0 h | 0 |
| Severn Trent Water | KENILWORTH - THE CLOSE/MILL END (CSO) | Finham Brook | 0 | 0 h | 0 |
| Severn Trent Water | SOUTHAM - BANBURY ROAD (CSO) | River Stowe | 0 | 0 h | 0 |
| Severn Trent Water | UPPER TYSOE - SMARTS LANE (SSO) | Wagtail Brook | 0 | 0 h | 0 |
| Thames Water | Ratley STW | Sor Brook | 0 | 0 h | 0 |
| Severn Trent Water | KINETON - CASTLE CRESCENT (CSO) | River Dene | 0 | 0 h | 0 |
| Severn Trent Water | LITTLE KINETON - BRIDGE STREET (CSO) | River Dene | 0 | 0 h | 0 |
| Severn Trent Water | HARBURY - MILL STREET (SSO) | Radford Brook | 0 | 0 h | 0 |
| Severn Trent Water | KINETON - BANBURY ROAD/MILL LANE (CSO) | River Dene | 0 | 0 h | 0 |
| Severn Trent Water | DUNCHURCH (STW) | River Leam | 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