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Mayfield Drive Ps1 CSO 512Ez: sewage overflow history

Review available Environment Agency annual monitoring returns for Mayfield Drive Ps1 CSO 512Ez. 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

108

2024

2025

Year	Counted spills	Total spill duration (hours)	Monitor operation (%)
2025	79	402.82	99.98
2024	108	611.09	99.98
2023	33	115.03	99.99
2022	0	0	100
2021	0	0	99.99

Published record details

Reference: UUP01266
Location: MERSEY - Transitional
Coordinates: 53.32930, -2.95492
Watercourse: River Mersey Estuary
Sewerage company: United Utilities
Asset type: SO on sewer network
Permit reference: 01WIR0108
Discharge grid reference: SJ3650081801
Reporting years: 2025, 2024, 2023, 2022, 2021
Catchment: MERSEY - Transitional

Location

Mayfield Drive Ps1 CSO 512Ez
53.32930, -2.95492

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

Mayfields Drive WW Ntwk PS0 km Eastham Village CSO0 km 3 Park Road CSO1.4 km Powerhouse Road Pumping Station1.4 km Thermal Road/Port Causeway CSO2 km

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