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Sherston Wastewater Treatment Works: sewage overflow history

Review available Environment Agency annual monitoring returns for Sherston Wastewater 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

2022

2023

2024

2025

Year	Counted spills	Total spill duration (hours)	Monitor operation (%)
2025	14	43.38	99.84
2024	25	139.25	100
2023	43	476.75	99.85
2022	33	106.5	99.78
2020	28	176	99

Published record details

Reference: WXW00986
Location: Sherston Avon
Coordinates: 51.56960, -2.20499
Watercourse: Avon (Sherston Branch)
Sewerage company: Wessex Water
Asset type: Storm tank at WwTW
Permit reference: 011559
Discharge grid reference: ST8588985657
Reporting years: 2025, 2024, 2023, 2022, 2020
Catchment: Sherston Avon

Location

Sherston Wastewater Treatment Works
51.56960, -2.20499

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.

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