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Chestergate/King Street West CSO: sewage overflow history

Review available Environment Agency annual monitoring returns for Chestergate/King Street West 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	5	2.5	97.98
2024	4	1.9	98.57
2023	3	0.57	100
2022	4	8.9	100
2021	11	16.27	100

Published record details

Reference: UUP00463
Location: Mersey (upstream of Manchester Ship Canal)
Coordinates: 53.40904, -2.16709
Watercourse: River Mersey
Sewerage company: United Utilities
Asset type: SO on sewer network
Permit reference: 016982674
Discharge grid reference: SJ8899090260
Reporting years: 2025, 2024, 2023, 2022, 2021
Catchment: Mersey (upstream of Manchester Ship Canal)

Location

Chestergate/King Street West CSO
53.40904, -2.16709

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

Hope Street Combined Sewer Overflow0.2 km Chestergate CSO 431A30.3 km Wellington Road South CSO0.3 km Travis Brow/Georges Road CSO0.4 km Great Underbank CSO 43200 Stk00390.5 km

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