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Town Street Sheffield CSO: sewage overflow history (YWS00802)

Review available Environment Agency annual monitoring returns for Town Street Sheffield 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	17	27.25	99.92
2024	26	39.5	98.86
2023	30	59.5	78.26

Published record details

Reference: YWS00802
Location: Don from River Don Works to River Rother
Coordinates: 53.41914, -1.39750
Watercourse: Don
Sewerage company: Yorkshire Water
Asset type: SO on sewer network
Permit reference: 665
Discharge grid reference: SK4014091540
Reporting years: 2025, 2024, 2023
Catchment: Don from River Don Works to River Rother

Location

Town Street Sheffield CSO
53.41914, -1.39750

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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