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Shirley Gardens CSO: sewage overflow history

Review available Environment Agency annual monitoring returns for Shirley Gardens 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	4	1.56	100
2024	0	0	100
2023	0	0	100
2022	1	1.72	100
2021	1	0.19	86

Published record details

Reference: SBB01085
Location: Not part of a WFD catchment
Coordinates: 50.40242, -4.15076
Watercourse: Ham Brook
Sewerage company: South West Water
Asset type: SO on sewer network
Permit reference: 301723
Discharge grid reference: SX47255805
Reporting years: 2025, 2024, 2023, 2022, 2021
Catchment: Not part of a WFD catchment

Location

Shirley Gardens CSO
50.40242, -4.15076

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

Honicknowle Lane CSO0.2 km 146 St. Pancras Avenue CSO0.4 km Garrick Close CSO0.7 km Treveneague Grdns Playing Field CSO0.7 km Honicknowle CSO0.8 km

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