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Polluted by sewage 84 times in 2025 - lasting 57 hours
Monitoring fell below 50% in some locations so could be more
Portland Harbour East; Portland Harbour West was the #78 most polluted shellfish area in England & Wales, by duration of sewage overflows, as reported by the water companies
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Donate NowHere are all the reported sewage overflow totals for Portland Harbour East; Portland Harbour West in 2025.
We use data from the water companies, but we are seeing many anomalies that make us believe that location information is quite poor. The situation is likely far worse than reported here.
In particular: Totals on this page can differ from totals in the Ranked Shellfish page - number on this page are higher - this is due to a lack of standardization on shellfish area names. This page more accurately counts the differing names. For example "Solway" and "SOLWAY" are counted as different in the rankings, but correctly aggregated here.
Other CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway s may also be located nearby, however the water companies claim that these do not affect the water quality here.
| Company | Waterway | Site | Sewage Dumps | Duration (Hours) | Reporting % |
|---|---|---|---|---|---|
| Wessex Water | Weymouth Harbour | THE MARSH COMBINED SEWER OVERFLOW | 10 | 15 | 100 |
| Wessex Water | Freshwater Bay | SOUTHWELL PS | 12 | 14 | 100 |
| Wessex Water | Weymouth Harbour | ADMIRAL HARDY CSO | 6 | 9 | 88.1 |
| Wessex Water | Weymouth Harbour | CHICKERELL BOYS CLUB CSO | 20 | 4 | 95.3 |
| Wessex Water | River Wey | FAIRFIELD SEWAGE PUMPING STATION | 4 | 4 | 100 |
| Wessex Water | Portland Harbour | REAR DONCASTER ROAD | 11 | 3 | 99.9 |
| Wessex Water | Weymouth Harbour | CHICKERELL ROAD CSO | 6 | 1 | 34 |
| Wessex Water | Portland Harbour | VICTORIA SQUARE PORTLAND | 5 | 1 | 100 |
| Wessex Water | Weymouth Harbour | WESTON ROAD CSO | 3 | 0 | 100 |
| Wessex Water | Portland Harbour | CASTLE COVE PUMPING STATION | 2 | 0 | 100 |
| Wessex Water | Portland Harbour | HILLCREST ROAD PUMPIMG STATION | 1 | 0 | 100 |
| Wessex Water | Weymouth Harbour | LONGCROFT ROAD CSO | 1 | 0 | 61.6 |
| Wessex Water | English Channel | PORTLAND BILL STORM OVERFLOW | 3 | 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
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