Polluted by sewage 3,326 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 Middlesbrough and Thornaby East, 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) |
|---|---|---|---|---|---|
| Northumbrian Water | Unknown | Unknown | 50 | 1,000 h 40m | 41.67 |
| Northumbrian Water | Unknown | Unknown | 45 | 597 h 51m | 24.88 |
| Northumbrian Water | CARGO FLEET FOUL SEWAGE PUMPING STATION | Ormsby Beck | 30 | 437 h 13m | 18.21 |
| Northumbrian Water | Unknown | Unknown | 41 | 328 h 12m | 13.67 |
| Northumbrian Water | Unknown | Unknown | 45 | 160 h 29m | 6.67 |
| Northumbrian Water | Unknown | Unknown | 20 | 70 h 45m | 2.92 |
| Northumbrian Water | Unknown | Unknown | 20 | 56 h 25m | 2.33 |
| Northumbrian Water | Unknown | Unknown | 23 | 54 h 45m | 2.25 |
| Northumbrian Water | Unknown | Unknown | 13 | 42 h 6m | 1.75 |
| Northumbrian Water | ACKLAM ROAD CSO | Old River Tees | 11 | 40 h 12m | 1.67 |
| Northumbrian Water | Unknown | Unknown | 12 | 39 h 58m | 1.62 |
| Northumbrian Water | Unknown | Unknown | 13 | 36 h 58m | 1.5 |
| Northumbrian Water | CARGO FLEET FOUL SEWAGE PUMPING STATION | Ormsby Beck | 7 | 32 h 5m | 1.33 |
| Northumbrian Water | Unknown | Unknown | 14 | 30 h 26m | 1.25 |
| Northumbrian Water | SUN STREET CSO | River Tees | 7 | 29 h 32m | 1.21 |
| Northumbrian Water | ACKLAM ROAD CSO | Old River Tees | 8 | 28 h 14m | 1.17 |
| Northumbrian Water | LEVEN ROAD CSO | Ormesby Beck | 6 | 24 h 54m | 1 |
| Northumbrian Water | PRIORY ROAD CSO | Old River Tees | 7 | 24 h 18m | 1 |
| Northumbrian Water | Unknown | Unknown | 12 | 22 h 36m | 0.92 |
| Northumbrian Water | NEWPORT ROAD CSO | River Tees Estuary | 10 | 22 h 20m | 0.92 |
| Northumbrian Water | SUN STREET CSO | River Tees | 7 | 21 h 48m | 0.88 |
| Northumbrian Water | CSO AT GREEN LANE | Tees | 10 | 21 h 12m | 0.88 |
| Northumbrian Water | OLD RIVER TEES SPS | Old River Tees | 6 | 20 h 4m | 0.83 |
| Northumbrian Water | Unknown | Unknown | 11 | 19 h 56m | 0.79 |
| Northumbrian Water | Unknown | Unknown | 11 | 16 h 46m | 0.67 |
| Northumbrian Water | CORNFIELD ROAD PUMPING STATION | Tees Estuary | 3 | 16 h 20m | 0.67 |
| Northumbrian Water | Unknown | Unknown | 7 | 12 h 59m | 0.5 |
| Northumbrian Water | Unknown | Unknown | 3 | 12 h 18m | 0.5 |
| Northumbrian Water | STAINSBY ROAD CSO | Old River Tees | 3 | 11 h 48m | 0.46 |
| Northumbrian Water | Unknown | Unknown | 5 | 11 h 39m | 0.46 |
| Northumbrian Water | GROVE ROAD CSO M009 | Ormesby Beck | 4 | 10 h 24m | 0.42 |
| Northumbrian Water | VULCAN STREET PUMP STN | River Tees | 3 | 10 h 10m | 0.42 |
| Northumbrian Water | Unknown | Unknown | 7 | 8 h 46m | 0.33 |
| Northumbrian Water | ACKLAM ROAD CSO | Old River Tees | 5 | 8 h 20m | 0.33 |
| Northumbrian Water | Unknown | Unknown | 10 | 7 h 59m | 0.29 |
| Northumbrian Water | Unknown | Unknown | 7 | 5 h 50m | 0.21 |
| Northumbrian Water | SNOWDON ROAD PS | River Tees | 4 | 4 h 31m | 0.17 |
| Northumbrian Water | VERONICA STREET CSO | Ormesby Beck | 5 | 4 h 2m | 0.17 |
| Northumbrian Water | Unknown | Unknown | 6 | 3 h 6m | 0.12 |
| Northumbrian Water | STATION STREET CSO | Tees Estuary | 5 | 2 h 58m | 0.08 |
| Northumbrian Water | Unknown | Unknown | 8 | 2 h 56m | 0.08 |
| Northumbrian Water | Unknown | Unknown | 1 | 1 h 45m | 0.04 |
| Northumbrian Water | THORNTON STREET PS | Middle Beck | 5 | 1 h 42m | 0.04 |
| Northumbrian Water | Unknown | Unknown | 2 | 1 h 20m | 0.04 |
| Northumbrian Water | JAMES STREET SSO | Middle Beck | 4 | 1 h 18m | 0.04 |
| Northumbrian Water | DEEPDALE AVENUE NO2 CSO (M007) | Marton West Beck | 2 | 1 h 16m | 0.04 |
| Northumbrian Water | Unknown | Unknown | 2 | 1 h 14m | 0.04 |
| Northumbrian Water | Unknown | Unknown | 2 | 1 h 4m | 0.04 |
| Northumbrian Water | TEDDER AVENUE SSO | Stainsby Beck | 1 | 0 h 46m | 0 |
| Northumbrian Water | OAKFIELD ROAD CSO | Ormesby Beck | 3 | 0 h 40m | 0 |
| Northumbrian Water | A66 RIDER SEWER CSO | Old River Tees | 2 | 0 h 36m | 0 |
| Northumbrian Water | Unknown | Unknown | 1 | 0 h 28m | 0 |
| Northumbrian Water | RAVENSCROFT AVE CSO | Marton West Beck | 1 | 0 h 6m | 0 |
| Northumbrian Water | Unknown | Unknown | 0 | 0 h | 0 |
| Northumbrian Water | ALLENSWAY CSO | Stainsby 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.