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Calne Wastewater Treatment Works: sewage overflow history (WXW00222)

Review available Environment Agency annual monitoring returns for Calne 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

2021

2022

2023

2024

2025

Year	Counted spills	Total spill duration (hours)	Monitor operation (%)
2025	21	43.8	99.99
2024	38	119.58	100
2023	56	120.2	100
2022	20	38.25	100
2021	16	13.5	99.17
2020	34	112	100

Published record details

Reference: WXW00222
Location: Marden - source to conf Cowage Bk
Coordinates: 51.44195, -2.03146
Watercourse: River Marden(S)
Sewerage company: Wessex Water
Asset type: Inlet SO at WwTW
Permit reference: 103731
Discharge grid reference: ST9791071440
Reporting years: 2025, 2024, 2023, 2022, 2021, 2020
Catchment: Marden - source to conf Cowage Bk

Location

Calne Wastewater Treatment Works
51.44195, -2.03146

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

Calne Wastewater Treatment Works0.2 km Mosses Mill Combined Sewer Overflow1.1 km Mosses Mill 1 Combined Sewer1.1 km Castlefields Park Combined Sewer1.9 km Market Hill CSO1.9 km

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