Portsmouth South was polluted by sewage 261 times in 2024
lasting 2,250 hours

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Contains OS Data © Crown copyright & database right 2021-2024
© Top of the Poops 2021-2024
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✔ means we have experimental daily data since 2023
Live data for Portsmouth South in 2025
So far this year (as of Apr 16, 2025, 6:30 PM) there has been 215 hours of sewage overflows
Totals for Portsmouth South in 2024
4 Sites polluted by Southern Water
261 sewage dumps
2,250 h duration
That's 3.12 months. 5 times a week, on average
Change Over Time
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Constituencies near Portsmouth South
Daily Data
We get information about overflowing CSOs since January 2025. Here is a chart of the last three months of data for Portsmouth South, here you can see overflows in red, the darker the red, the more the CSO overflowed that day.
Each CSO has a row, the most recent data is on the right hand side.
     Monitoring Online      Monitoring Offline      Polluting      Potentially Polluting      Unknown
Daily data is experimental and data is not guaranteed to be accurate. Please inform us of any issue, we will fix.

Pollution Summary 2024

Here are all the reported sewage overflow totals for Portsmouth South in 2024. Sometimes sewage can be being dumped for months at a time.

Reporting refers to how much of the time the monitoring was active. In this constituency 0 of the total 5 CSO locations had reporting enabled for less than half the year, of which 0 had zero reporting.

Company Waterway Site Sewage Dumps Duration (Hours) Reporting %
Southern Water Solent/Langstone Harbour BUDDS FARM WWTW 94 1,292 99.9
Southern Water Solent HENDERSON ROAD EASTNEY WPS 124 883 99.8
Southern Water Langstone Harbour FORT CUMBERLAND STORMWATER TANKS 13 43 97.3
Southern Water Solent PIER ROAD PS 30 30 99.9
Southern Water Portsmouth Harbour HOLBROOK ROAD/PYNING STREET CSO 0 0 99.8

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.