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Marlston Cum Lache PS SSO: sewage overflow history

Review available Environment Agency annual monitoring returns for Marlston Cum Lache PS SSO. 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

2024

2025

Year	Counted spills	Total spill duration (hours)	Monitor operation (%)
2025	1	0.25	89.71
2024	45	476.75	53.32

Published record details

Reference: DCW00077
Location: Balderton drain
Coordinates: 53.15621, -2.93701
Watercourse: Tributary of Balderton Brook
Sewerage company: Dwr Cymru Welsh Water
Asset type: Storm discharge at pumping station
Permit reference: CM0075401
Discharge grid reference: SJ3744062530
Reporting years: 2025, 2024
Catchment: Balderton drain

Location

Marlston Cum Lache PS SSO
53.15621, -2.93701

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

Marlston-Cum-Lache Pumping Station1.5 km Saltney Sewerage Chester Street PS3.1 km Storm overflow DCW000023.4 km The Dingle Combined Sewer Overflow3.8 km Rear Of 22 Curzon Park North CSO3.8 km

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