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Itchen Bank Sewage Treatment Works: sewage overflow history

Review available Environment Agency annual monitoring returns for Itchen Bank 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

2020

107

2023

121

2024

2025

Year	Counted spills	Total spill duration (hours)	Monitor operation (%)
2025	53	560.83	99.97
2024	121	1,834.18	97.01
2023	107	1,239.87	99.8
2020	51	487.23	100

Published record details

Reference: SVT01223
Location: Itchen - conf R Stowe to conf R Leam
Coordinates: 52.26206, -1.40547
Watercourse: River Itchen
Sewerage company: Severn Trent Water
Asset type: Storm tank at WwTW
Permit reference: S/12/26557/R
Discharge grid reference: SP4067462821
Reporting years: 2025, 2024, 2023, 2020
Catchment: Itchen - conf R Stowe to conf R Leam

Location

Itchen Bank Sewage Treatment Works
52.26206, -1.40547

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

Bascote Sewage Treatment Works1.1 km Southam Pumping Station (Sps)1.4 km Southam - Banbury Road CSO1.8 km Long Itchington Sps2.2 km Habury Sewage Pmp.Stn - Storm3.1 km

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