Southampton Water

Polluted by sewage 497 times in 2024 - lasting 4,562 hours

Monitoring fell below 50% in some locations so could be more

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Contains OS Data © Crown copyright & database right 2021-2024
© Top of the Poops 2021-2024

Totals for Southampton Water in 2024

21 Sites polluted by Southern Water
497 sewage dumps
4,562 hours duration
That's 6.34 months. On average 1.4 times a day

How does Southampton Water compare?

Southampton Water was the #10 most polluted shellfish area in England & Wales, by duration of sewage overflows, as reported by the water companies

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Pollution Summary 2024

Here are all the reported sewage overflow totals for Southampton Water in 2024.

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 Test MILLBROOK WWTW 99 1,555 100
Southern Water River Itchen Estuary PORTSWOOD WWTW 91 994 99.9
Southern Water Southampton Water SLOWHILL COPSE WWTW 84 969 100
Southern Water River Itchen Estuary WOOLSTON WWTW 35 340 99.8
Southern Water River Itchen Estuary CHAPEL WHARF WPS 40 335 77.5
Southern Water Bartley Water DOWNS PARK TOTTON CEO 28 116 99.8
Southern Water River Itchen SIRDAR ROAD SOUTHAMPTON CSO 33 81 100
Southern Water River Test MILLBROOK WWTW 23 74 100
Southern Water Test Estuary CAWTE ROAD/PARK ROAD CSO 18 49 99.8
Southern Water River Itchen IMPERIAL ROAD MOUNT PLEASANT CEO 8 15 99.9
Southern Water River Test BLECHYNDEN TERRACE SOUTHAMPTON CSO 9 11 99.9
Southern Water River Itchen GATERS MILL 3 8 99.8
Southern Water River Itchen UPR SHAFTESBURY AVE SOUTHAMPTON CSO 2 1 99.8
Southern Water River Itchen Estuary RAMPART ROAD PS 3 1 96
Southern Water Saline Estuary WESSEX LANE SOUTHAMPTON 1 1 100
Southern Water Saline Estuary WESSEX LANE SOUTHAMPTON OUTSIDE 15 1 1 100
Southern Water Itchen Estuary LAWN ROAD/OSBOURNE ROAD 4 1 66.8
Southern Water Saline Estuary WESSEX LANE SOUTHAMPTON OUTSIDE 11 10 1 57.2
Southern Water Itchen Estuary SOUTHCLIFF ROAD/LIVERPOOL STREET 3 1 26.1
Southern Water River Itchen Estuary WOOLSTON WWTW 1 0 99.8
Southern Water River Midden GLENFIELD AVENUE CSO 1 0 25.1

Data Sources & Accuracy

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. 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.