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Spooks Hill: sewage overflow history

Review available Environment Agency annual monitoring returns for Spooks Hill. 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

2023

2024

2025

Year	Counted spills	Total spill duration (hours)	Monitor operation (%)
2025	3	12	96.84
2024	12	36.25	99.92
2023	6	9.25	97.07

Published record details

Reference: TWL00381
Location: Tanners Brook (Holmewood to River Mole confluence at Brockham)
Coordinates: 51.21476, -0.32839
Watercourse: Tanners Brook (Bents Brook)
Sewerage company: Thames Water
Asset type: SO on sewer network
Permit reference: CTCR.1922
Discharge grid reference: TQ1685047500
Reporting years: 2025, 2024, 2023
Catchment: Tanners Brook (Holmewood to River Mole confluence at Brockham)

Location

Spooks Hill
51.21476, -0.32839

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

Bentsbrook Road Sws0.8 km Coach Road CSO On Stonebridge Sewer3.2 km Dorking STW (Storm)3.2 km Holmwood Wastewater Treatment Works3.3 km Brockham Bridge3.5 km

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