Sewage Tank Cleaning

Hoylake Road/Chapelhill CSO: sewage overflow history

Review available Environment Agency annual monitoring returns for Hoylake Road/Chapelhill 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	26	93.5	89.39
2024	35	86.2	99.19
2023	41	97.2	100
2022	18	32.63	86.04
2021	18	66.2	100

Published record details

Reference: UUP00996
Location: The Birket including Arrowe Brook and Fender
Coordinates: 53.40463, -3.08988
Watercourse: River Fender
Sewerage company: United Utilities
Asset type: SO on sewer network
Permit reference: 016881732
Discharge grid reference: SJ2764090310
Reporting years: 2025, 2024, 2023, 2022, 2021
Catchment: The Birket including Arrowe Brook and Fender

Location

Hoylake Road/Chapelhill CSO
53.40463, -3.08988

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

Briscoe Drive CSO 511G90.6 km Upton Road CSO 513N80.6 km Rear Of 25 Wheatfield Close CSO0.6 km Bidston By-Pass CSO1 km Upton Storm Tanks1.3 km

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