Designated shellfish area 'PORTSMOUTH HARBOUR' polluted by sewage 305 times in 2022 - lasting 2,044 hours

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Totals for PORTSMOUTH HARBOUR in 2022
21 Sites polluted by Southern Water
305 sewage dumps
2,044 h duration
That's 2.84 months. 5.9 times a week, on average
How does PORTSMOUTH HARBOUR compare?

PORTSMOUTH HARBOUR was the #24 most polluted shellfish area in England & Wales, by duration of sewage overflows, as reported by the water companies

Pollution Summary 2022

Here are all the reported sewage overflow totals for PORTSMOUTH HARBOUR in 2022.

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 62 1,084 100
Southern Water Wallington River HIGH STREET FAREHAM CSO 47 331 99.8
Southern Water Fareham Lake WYCH LANE/FAREHAM RD O/FLOW 41 164 100
Southern Water River Wallington SOUTHWICK WWTW 13 89 99.9
Southern Water Hoeford Lake HOEFORD FAREHAM CEO 15 67 99.8
Southern Water Blackbrook Stream THE GILLIES FAREHAM CSO 17 47 100
Southern Water Black Brook ELMHURST ROAD (COMPASS POINT) CSO 20 46 95.3
Southern Water Black Brook STORM OVERFLOW AT ARUNDEL DRIVE 16 29 98.6
Southern Water Fareham Creek/Portsmouth Hbr QUAY STREET, FAREHAM CSO 22 29 98.4
Southern Water Saline Estuary GREEN CRESCENT O/FLOW 6 25 100
Southern Water Hoeford Stream COTSWOLD WALK CSO 2 23 87.2
Southern Water Black Brook REDLANDS LANE FAREHAM CSO 9 23 98.5
Southern Water River Wallington NEWMANS BRIDGE SOUTHWICK CEO 5 20 99.8
Southern Water River Wallington WICKHAM ROAD FAREHAM WPS CSO 5 19 99.7
Southern Water Portsmouth Harbour WICOR MILL LANE PORTCHESTER CEO 4 10 100
Southern Water Frater Lake, Portsmouth Hbr BREWERS LANE GOSPORT CSO 2 8 100
Southern Water Portsmouth Harbour SALTERNS LANE FAREHAM CEO 2 6 99.8
Southern Water Fareham Creek/Portsmouth Hbr BRIDGEFOOT PUMPING STATION 4 5 100
Southern Water Frater Lake FAREHAM ROAD GOSPORT O/S 68 CSO 2 4 100
Southern Water Fareham Creek/Portsmouth Hbr CAMS HILL, FAREHAM CSO 8 3 100
Southern Water Portsmouth Harbour COW LANE PORTCHESTER CEO 3 1 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.