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Berkhamsted Sewage Treatment Works: sewage overflow history

Review available Environment Agency annual monitoring returns for Berkhamsted Sewage 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

157

2024

2025

Year	Counted spills	Total spill duration (hours)	Monitor operation (%)
2025	35	209.75	100
2024	157	1,775.75	100
2023	33	227.25	99.82

Published record details

Reference: TWL00037
Location: Grand Union Canal, Berkhamstead to Maple Lodge (RIvers Bulbourne, Gade and Colne)
Coordinates: 51.75083, -0.53381
Watercourse: The Grand Union Canal
Sewerage company: Thames Water
Asset type: Storm tank at WwTW
Permit reference: CATM.3074
Discharge grid reference: TL0131006810
Reporting years: 2025, 2024, 2023
Catchment: Grand Union Canal, Berkhamstead to Maple Lodge (RIvers Bulbourne, Gade and Colne)

Location

Berkhamsted Sewage Treatment Works
51.75083, -0.53381

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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