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Tidal River Ouse polluted by sewage 156 times in 2025 - lasting 2,486 hours

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Totals for Tidal River Ouse in 2025
2 Sites polluted by Southern Water
156 sewage dumps
2,486 h duration
That's 3.45 months. 3 times a week, on average
Constituencies along Tidal River Ouse
Places along Tidal River Ouse

Pollution Summary 2025

Here are all the reported sewage overflow totals for Tidal River Ouse in 2025. Sometimes sewage can be being dumped for months at a time.

Company Waterway Site Sewage Dumps Duration (Hours) Reporting %
Southern Water Tidal River Ouse HAM LANE LEWES SETTLES STORM TANK 155 2,485 99.3
Southern Water Tidal River Ouse SEAFORD BAY OUTFALL 1 1 41.7
Southern Water Tidal River Ouse DENTON ISLAND NEWHAVEN CSO 0 0 99.7

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. 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.

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