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CSO South Of Ashawe Grove: sewage overflow history (UUP00584)

Review available Environment Agency annual monitoring returns for CSO South Of Ashawe Grove. 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	38	115.07	99.69
2024	26	82.2	33.5
2023	54	123.47	99.98
2022	39	61.87	94.79
2021	56	176.13	100

Published record details

Reference: UUP00584
Location: Astley Brook (Mersey)
Coordinates: 53.52316, -2.43044
Watercourse: Trib Of Honksford Brook
Sewerage company: United Utilities
Asset type: SO on sewer network
Permit reference: 016982741
Discharge grid reference: SD7156003030
Reporting years: 2025, 2024, 2023, 2022, 2021
Catchment: Astley Brook (Mersey)

Location

CSO South Of Ashawe Grove
53.52316, -2.43044

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

CSO South Of Ashawe Grove0 km Beech Grove CSO0 km Little Hulton CSO0.6 km Worsley WWTW0.7 km Worsley WWTW0.7 km

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