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Bascote Sewage Treatment Works: sewage overflow history

Review available Environment Agency annual monitoring returns for Bascote 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

2021

2022

2023

2024

2025

Year	Counted spills	Total spill duration (hours)	Monitor operation (%)
2025	12	65.76	99.39
2024	2	21.39	98.94
2023	14	69.91	95.9
2022	0	0	100
2021	0	0	99.15
2020	47	628.34	100

Published record details

Reference: SVT00193
Location: Itchen - conf R Stowe to conf R Leam
Coordinates: 52.27239, -1.40612
Watercourse: Tributary Of River Itchen
Sewerage company: Severn Trent Water
Asset type: Inlet SO at WwTW
Permit reference: S/12/25831/R
Discharge grid reference: SP4062063970
Reporting years: 2025, 2024, 2023, 2022, 2021, 2020
Catchment: Itchen - conf R Stowe to conf R Leam

Location

Bascote Sewage Treatment Works
52.27239, -1.40612

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

Long Itchington Sps1 km Itchen Bank Sewage Treatment Works1.1 km Southam Pumping Station (Sps)2.4 km Southam - Banbury Road CSO2.8 km Stockton-New Zealand/Napton Rdsps3.8 km

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