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Great Underbank CSO 43200 Stk0039: sewage overflow history

Review available Environment Agency annual monitoring returns for Great Underbank CSO 43200 Stk0039. 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	39	75.22	69.5
2024	34	54.41	100
2023	29	30	76.45
2022	35	43.56	99.99
2021	44	78.12	99.97

Published record details

Reference: UUP00844
Location: Mersey (upstream of Manchester Ship Canal)
Coordinates: 53.41084, -2.15987
Watercourse: Clvrt Section Of River Mersey
Sewerage company: United Utilities
Asset type: SO on sewer network
Permit reference: 016940449
Discharge grid reference: SJ8947090460
Reporting years: 2025, 2024, 2023, 2022, 2021
Catchment: Mersey (upstream of Manchester Ship Canal)

Location

Great Underbank CSO 43200 Stk0039
53.41084, -2.15987

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

Princes Street CSO0.1 km Wellington Road South CSO0.2 km Chestergate CSO 431A30.3 km Chestergate/King Street West CSO0.5 km Avenue St Brewery St CSO0.6 km

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