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Upr Shaftesbury Ave Southampton CSO: sewage overflow history

Review available Environment Agency annual monitoring returns for Upr Shaftesbury Ave Southampton 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

2021

2022

2023

2024

2025

Year	Counted spills	Total spill duration (hours)	Monitor operation (%)
2025	1	0.26	99.87
2024	2	1.77	99.77
2023	2	0.84	99.9
2022	0	0	100
2021	4	1.4	100

Published record details

Reference: SWS00897
Location: Southampton Water
Coordinates: 50.92885, -1.38141
Watercourse: River Itchen
Sewerage company: Southern Water
Asset type: SO on sewer network
Permit reference: A01295
Discharge grid reference: SU4357014560
Reporting years: 2025, 2024, 2023, 2022, 2021
Catchment: SOUTHAMPTON WATER

Location

Upr Shaftesbury Ave Southampton CSO
50.92885, -1.38141

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

Portswood WWTW0 km Sirdar Road Southampton CSO0.4 km Cedar Road Southampton CSO1.1 km Lawn Road/Osbourne Road1.1 km Wessex Lane Southampton Outside 111.5 km

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