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Phillack CSO: sewage overflow history

Review available Environment Agency annual monitoring returns for Phillack CSO. 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

2023

2024

2025

Year	Counted spills	Total spill duration (hours)	Monitor operation (%)
2025	0	0	100
2024	0	0	100
2023	0	0	100

Published record details

Reference: SBB00935
Location: Not part of a WFD catchment
Coordinates: 50.19366, -5.41215
Watercourse: Hayle Estuary (E)
Sewerage company: South West Water
Asset type: SO on sewer network
Permit reference: 301821
Discharge grid reference: SW56563820
Reporting years: 2025, 2024, 2023
Catchment: Not part of a WFD catchment

Location

Phillack CSO
50.19366, -5.41215

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

Storm overflow SBB014000.4 km Relistian Pumping Station4.1 km Porthminster Point 1 Eo4.2 km Hayle Sewage Treatment Works5.1 km Bamaluz Point Storm Water & Eo5.1 km

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