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139 Outland Road CSO: sewage overflow history

Review available Environment Agency annual monitoring returns for 139 Outland Road 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	28	24.22	94.35
2024	27	12.07	73.9
2023	36	72.84	100

Published record details

Reference: SBB00007
Location: Plymouth Tamar
Coordinates: 50.36944, -4.16376
Watercourse: Stonehouse Creek (E)
Sewerage company: South West Water
Asset type: SO on sewer network
Permit reference: 301761
Discharge grid reference: SX46225441
Reporting years: 2025, 2024, 2023
Catchment: PLYMOUTH TAMAR

Location

139 Outland Road CSO
50.36944, -4.16376

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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