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Blockley Sewage Treatment Works: sewage overflow history

Review available Environment Agency annual monitoring returns for Blockley 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

212

2020

111

2021

156

2022

178

2023

106

2024

2025

Year	Counted spills	Total spill duration (hours)	Monitor operation (%)
2025	32	479.95	99.99
2024	106	2,034.25	95.44
2023	178	3,535.17	81.8
2022	156	3,296.84	99.99
2021	111	962.82	99.27
2020	212	3,330.1	100

Published record details

Reference: SVT00297
Location: Blockley Bk - source to conf Knee Bk
Coordinates: 52.02504, -1.73647
Watercourse: Blockley Brook
Sewerage company: Severn Trent Water
Asset type: Storm tank at WwTW
Permit reference: S/14/25492/R
Discharge grid reference: SP1817936324
Reporting years: 2025, 2024, 2023, 2022, 2021, 2020
Catchment: Blockley Bk - source to conf Knee Bk

Location

Blockley Sewage Treatment Works
52.02504, -1.73647

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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