Designated shellfish area 'PORTSMOUTH HARBOUR' polluted by sewage 535 times in 2023 - lasting 4,698 hours

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Totals for PORTSMOUTH HARBOUR in 2023
19 Sites polluted by Southern Water
535 sewage dumps
4,698 h duration
That's 6.53 months. On average 1.5 times a day
How does PORTSMOUTH HARBOUR compare?

PORTSMOUTH HARBOUR was the #11 most polluted shellfish area in England & Wales, by duration of sewage overflows, as reported by the water companies

Pollution Summary 2023

Here are all the reported sewage overflow totals for PORTSMOUTH HARBOUR in 2023.

Accuracy Warning 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 CSOs 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 %
Southern Water River Meon WICKHAM WWTW 118 2,255 99.3
Southern Water Wallington River HIGH STREET FAREHAM CSO 92 961 99.9
Southern Water River Wallington SOUTHWICK WWTW 37 406 98.1
Southern Water Fareham Lake WYCH LANE/FAREHAM RD O/FLOW 77 299 100
Southern Water Hoeford Lake HOEFORD FAREHAM CEO 41 176 99.4
Southern Water Saline Estuary GREEN CRESCENT O/FLOW 12 104 89.5
Southern Water Blackbrook Stream THE GILLIES FAREHAM CSO 20 77 99.9
Southern Water Portsmouth Harbour WICOR MILL LANE PORTCHESTER CEO 15 70 99.9
Southern Water Frater Lake, Portsmouth Hbr BREWERS LANE GOSPORT CSO 7 65 97.7
Southern Water Black Brook ELMHURST ROAD (COMPASS POINT) CSO 21 60 53.2
Southern Water Frater Lake FAREHAM ROAD GOSPORT O/S 68 CSO 12 41 98.8
Southern Water River Wallington WICKHAM ROAD FAREHAM WPS CSO 12 39 99.8
Southern Water Fareham Creek/Portsmouth Hbr QUAY STREET, FAREHAM CSO 30 37 93.2
Southern Water Black Brook STORM OVERFLOW AT ARUNDEL DRIVE 17 32 99.8
Southern Water Fareham Creek/Portsmouth Hbr BRIDGEFOOT PUMPING STATION 9 24 100
Southern Water River Wallington NEWMANS BRIDGE SOUTHWICK CEO 4 22 99.8
Southern Water Black Brook REDLANDS LANE FAREHAM CSO 4 15 98.9
Southern Water Fareham Creek/Portsmouth Hbr CAMS HILL, FAREHAM CSO 6 3 100
Southern Water Portsmouth Harbour COW LANE PORTCHESTER CEO 1 0 99.9

Data Sources & Accuracy

EDM (Event Duration Monitoring) data and Consented Discharges to Controlled Waters with Conditions from Environment Agency & Data Map Wales

Experimental derived data from Thames Water API, Some data may be missing or inaccurate. This 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.