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Slough Wastewater Treatment Works: sewage overflow history

Review available Environment Agency annual monitoring returns for Slough Wastewater Treatment Works. 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	14	245.5	99.16
2024	70	1,220.5	99.89
2023	32	363.5	78.55

Published record details

Reference: TWL00397
Location: Roundmoor Ditch and Boveney Ditch
Coordinates: 51.50594, -0.65047
Watercourse: Roundmoor Ditch
Sewerage company: Thames Water
Asset type: Storm tank at WwTW - with treatment
Permit reference: CNTM.2237
Discharge grid reference: SU9376079420
Reporting years: 2025, 2024, 2023
Catchment: Roundmoor Ditch and Boveney Ditch

Location

Slough Wastewater Treatment Works
51.50594, -0.65047

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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