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West End/ Wharf Road CSO 425F3: sewage overflow history

Review available Environment Agency annual monitoring returns for West End/ Wharf Road CSO 425F3. 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	35	485.8	95.33
2024	13	45.53	98.83
2023	39	81.37	100
2022	9	12.63	96.81
2021	36	104.43	100

Published record details

Reference: UUP02076
Location: Sankey Brook (Rainford Brook to Mersey)
Coordinates: 53.44817, -2.65418
Watercourse: Sankey Brook
Sewerage company: United Utilities
Asset type: SO on sewer network
Permit reference: 016982990
Discharge grid reference: SJ5665094800
Reporting years: 2025, 2024, 2023, 2022, 2021
Catchment: Sankey Brook (Rainford Brook to Mersey)

Location

West End/ Wharf Road CSO 425F3
53.44817, -2.65418

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

Wharf Road CSO 420770.1 km Wharf Road CSO0.1 km Penkford Bridge Storm Overflow0.4 km Pennington Lane CSO0.5 km Tbc0.6 km

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