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Storm overflow TWL00621: sewage overflow history

Review available Environment Agency annual monitoring returns for Storm overflow TWL00621. 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	1	0.1	100
2024	3	1.63	99.12
2023	1	0.13	80

Published record details

Reference: TWL00621
Location: Lee (from Luton to Luton Hoo Lakes)
Coordinates: 51.88140, -0.41727
Watercourse: Not Applicable
Sewerage company: Thames Water
Asset type: SO on sewer network
Permit reference: Permit applied for
Discharge grid reference: TL0903921499
Reporting years: 2025, 2024, 2023
Catchment: Lee (from Luton to Luton Hoo Lakes)

Location

Storm overflow TWL00621
51.88140, -0.41727

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

Storm overflow TWL005440 km Storm overflow TWL006240 km Storm overflow TWL005000.2 km CSO At Barbers Lane0.2 km Storm overflow TWL005510.2 km

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