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Millstreet CSO: sewage overflow history

Review available Environment Agency annual monitoring returns for Millstreet 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

2021

2022

2023

2024

2025

Year	Counted spills	Total spill duration (hours)	Monitor operation (%)
2025	4	2.72	100
2024	5	8.24	100
2023	5	8.7	100
2022	5	3.2	100
2021	12	13.55	100

Published record details

Reference: SBB00788
Location: Lower River Otter
Coordinates: 50.74850, -3.28572
Watercourse: River Otter Via Sws
Sewerage company: South West Water
Asset type: SO on sewer network
Permit reference: 201381
Discharge grid reference: SY09399511
Reporting years: 2025, 2024, 2023, 2022, 2021
Catchment: Lower River Otter

Location

Millstreet CSO
50.74850, -3.28572

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

Ottery St Mary Attenuation Tank0.1 km West Bank Pumping Station0.1 km Batts Lane Combined Sewer Overflow0.7 km Chapel Lane Combined Sewer Overflow0.8 km Butts Hill Pumping Station1.1 km

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