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Darlington Crown Street No 34 CSO: sewage overflow history

Review available Environment Agency annual monitoring returns for Darlington Crown Street No 34 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	11	29.97	99.96
2024	15	29.75	97.19
2023	19	26.5	99.58
2022	11	21.5	99.91
2021	14	23	99.99

Published record details

Reference: NWL00419
Location: Skerne from Demons Beck to Tees
Coordinates: 54.52525, -1.55126
Watercourse: River Skerne
Sewerage company: Northumbrian Water
Asset type: SO on sewer network
Permit reference: EPRCB3095WD
Discharge grid reference: NZ2914214533
Reporting years: 2025, 2024, 2023, 2022, 2021
Catchment: Skerne from Demons Beck to Tees

Location

Darlington Crown Street No 34 CSO
54.52525, -1.55126

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

CSO Yarm Road Dl180.3 km Neasham Road (Y4) CSO0.3 km Neasham Road CSO (Y5)0.3 km Yarm Road CSO (Y2)0.3 km Yarm Road CSO (Y3)0.3 km

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