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Here are all the reported sewage overflow totals for River Derwent in 2025. Sometimes sewage can be being dumped for months at a time.
| Company | Waterway | Site | Sewage Dumps | Duration (Hours) | Reporting % |
|---|---|---|---|---|---|
| Yorkshire Water | River Derwent | KEXBY SEWAGE TREATMENT WORKS | 89 | 1,197 | 99.1 |
| Yorkshire Water | River Derwent | STAMFORD BRIDGE NORTH SPS | 62 | 1,110 | 100 |
| Yorkshire Water | River Derwent | MALTON SEWAGE TREATMENT WORKS | 35 | 419 | 100 |
| Yorkshire Water | River Derwent | CASTLEGATE SEWAGE PUMPING STATION | 20 | 402 | 100 |
| Yorkshire Water | River Derwent | HOWSHAM SEWAGE TREATMENT WORKS | 31 | 372 | 100 |
| Yorkshire Water | River Derwent | STAMFORD BRIDGE SPS | 38 | 345 | 100 |
| Yorkshire Water | River Derwent | CHANDLERS WHARF SPS | 23 | 223 | 100 |
| Yorkshire Water | River Derwent | NORTON CHURCH STREET CSO | 54 | 113 | 100 |
| Yorkshire Water | River Derwent | SHEEPFOOT HILL CSO | 6 | 91 | 100 |
| Yorkshire Water | River Derwent | CRAMBE SEWAGE TREATMENT WORKS | 11 | 63 | 100 |
| Yorkshire Water | River Derwent | WHEELGATE CSO | 46 | 56 | 100 |
| Yorkshire Water | River Derwent | LASCELLES LANE SPS | 31 | 38 | 100 |
| Yorkshire Water | River Derwent | MALTON HOLMESFIELD SPS | 88 | 22 | 100 |
| Yorkshire Water | River Derwent | AYTON FOOTBRIDGE SSO | 13 | 13 | 96.9 |
| Yorkshire Water | River Derwent | CARR LANE EAST AYTON CSO | 3 | 4 | 100 |
| Yorkshire Water | River Derwent | HAWKSWELL LANE CSO | 5 | 1 | 100 |
| Yorkshire Water | River Derwent | OLD MALTONGATE CSO | 2 | 0 | 100 |
| Yorkshire Water | River Derwent | THE BROWS CSO | 0 | 0 | 100 |
| Yorkshire Water | River Derwent | TOWN STREET MALTON CSO | 0 | 0 | 97.3 |
| Yorkshire Water | River Derwent | YORKERSGATE COMBINED SEWER OVERFLOW | 0 | 0 | 100 |
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
Annual figures up to and including 2025 come from official water company returns. The 2026 figure is our own estimate, derived continuously from the companies' live data feeds.
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