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Derby - Eastgate/Pentagon Island (CSO): sewage overflow history

Review available Environment Agency annual monitoring returns for Derby - Eastgate/Pentagon Island (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	15	83.62	99.99
2024	24	135.07	99.72
2023	34	187.78	99.1
2022	12	50.25	81.61
2021	26	138.31	99.42

Published record details

Reference: SVT00834
Location: Derwent from Bottle Brook to Trent
Coordinates: 52.91825, -1.44714
Watercourse: River Derwent
Sewerage company: Severn Trent Water
Asset type: SO on sewer network
Permit reference: T/48/00758/O
Discharge grid reference: SK3727135791
Reporting years: 2025, 2024, 2023, 2022, 2021
Catchment: Derwent from Bottle Brook to Trent

Location

Derby - Eastgate/Pentagon Island (CSO)
52.91825, -1.44714

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

Derby - Wayzgoose Drive (CSO)0 km John Berrysford Close CSO0.5 km Nottingham Rd/The Crescent Jcn CSO0.9 km Chaddesden Park Rd/Mayfield Rd CSO0.9 km Durham Avenue/Suffolk Avenue CSO0.9 km

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