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Grove Road Chatham O/S 77 CSO: sewage overflow history

Review available Environment Agency annual monitoring returns for Grove Road Chatham O/S 77 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	1	0.23	99.62
2024	1	0.03	100
2023	0	0	70
2022	1	0.23	86.63
2021	0	0	19

Published record details

Reference: SWS00372
Location: Medway
Coordinates: 51.38513, 0.52246
Watercourse: River Medway Estuary
Sewerage company: Southern Water
Asset type: SO on sewer network
Permit reference: A00929
Discharge grid reference: TQ7562068140
Reporting years: 2025, 2024, 2023, 2022, 2021
Catchment: MEDWAY

Location

Grove Road Chatham O/S 77 CSO
51.38513, 0.52246

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

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