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Whittle Brook PS: sewage overflow history

Review available Environment Agency annual monitoring returns for Whittle Brook PS. 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	22	59.36	100
2024	32	57.57	100
2023	39	49.17	99.98
2022	23	30.04	100
2021	34	84.46	100

Published record details

Reference: UUP02121
Location: MERSEY - Transitional
Coordinates: 53.38085, -2.63691
Watercourse: Mersey Estuary
Sewerage company: United Utilities
Asset type: Storm discharge at pumping station
Permit reference: EPRCP3822XM
Discharge grid reference: SJ5773087300
Reporting years: 2025, 2024, 2023, 2022, 2021
Catchment: MERSEY - Transitional

Location

Whittle Brook PS
53.38085, -2.63691

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.

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