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Rotherwick: sewage overflow history

Review available Environment Agency annual monitoring returns for Rotherwick. 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	8	74.33	100
2024	11	37.57	96.97
2023	6	40.43	99.52

Published record details

Reference: TWL00354
Location: Whitewater
Coordinates: 51.30670, -0.97136
Watercourse: Rotherwick Brook
Sewerage company: Thames Water
Asset type: Storm discharge at pumping station
Permit reference: TEMP.1825
Discharge grid reference: SU7180056900
Reporting years: 2025, 2024, 2023
Catchment: Whitewater

Location

Rotherwick
51.30670, -0.97136

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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