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Antony STW (Inlet To Works) SSO: sewage overflow history

Review available Environment Agency annual monitoring returns for Antony STW (Inlet To Works) SSO. 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

130

2023

2024

2025

Year	Counted spills	Total spill duration (hours)	Monitor operation (%)
2025	64	133.8	98.07
2024	71	304.34	76.35
2023	130	591.61	93.59

Published record details

Reference: SBB00045
Location: Not part of a WFD catchment
Coordinates: 50.37124, -4.25356
Watercourse: River Lynher Estuary
Sewerage company: South West Water
Asset type: Inlet SO at WwTW
Permit reference: NRA-SW-1004
Discharge grid reference: SX39845480
Reporting years: 2025, 2024, 2023
Catchment: Not part of a WFD catchment

Location

Antony STW (Inlet To Works) SSO
50.37124, -4.25356

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

St John STW1.5 km Torpoint Wastewater Treatment Works1.8 km Sheviock STW So2.4 km Forder No 2 Pscso/Eo3.6 km Dawes Lane Combined Sewer Overflow3.7 km

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