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Brixton And Clapham Sr CSO: sewage overflow history (TWL00056)

Review available Environment Agency annual monitoring returns for Brixton And Clapham Sr CSO. Compare reported spill counts, total duration and monitor operation by year, with source details and gaps in the series identified.

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Annual monitoring returns

130

2023

2024

2025

Year	Counted spills	Total spill duration (hours)	Monitor operation (%)
2025	3	25.4	100
2024	67	787.2	96.45
2023	130	914.7	96.58

Published record details

Reference: TWL00056
Location: Thames Middle
Coordinates: 51.48704, -0.12545
Watercourse: R.Thames ( Tidal )
Sewerage company: Thames Water
Asset type: SO on sewer network
Permit reference: CSAB.0554
Discharge grid reference: TQ3025078120
Reporting years: 2025, 2024, 2023
Catchment: THAMES MIDDLE

Location

Brixton And Clapham Sr CSO
51.48704, -0.12545

Understanding annual storm overflow figures

The Environment Agency's annual returns report storm overflow monitoring information supplied by water companies. Spill counts use the regulatory 12/24-hour block method, so a counted spill is not necessarily a single uninterrupted discharge. Duration is the reported total time in spill, rather than the volume of sewage discharged. Monitor operation indicates the percentage of the reporting period for which the monitor operated. Missing values, incomplete monitoring and changes in recorded outlet details can affect comparisons between years. These annual figures describe historical reporting periods, not live discharge conditions or the cause of sewage problems at an individual property.

Nearby records

Brixton And Clapham Sr CSO0 km Clapham Storm Relief Sewer0 km King'S Scholars Pond CSO0.4 km Grosvenor Ditch CSO0.7 km South West Sr CSO0.8 km

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