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Fellside CSO (Der 174): sewage overflow history

Review available Environment Agency annual monitoring returns for Fellside CSO (Der 174). 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	13	15.68	99.99
2024	17	27.75	99.96
2023	31	54.5	99.39
2022	17	24	99.98
2021	19	22	99.98

Published record details

Reference: NWL00541
Location: Smallhope Burn from Source to Browney, Stocke
Coordinates: 54.83749, -1.82357
Watercourse: Backgill Burn Tributary
Sewerage company: Northumbrian Water
Asset type: SO on sewer network
Permit reference: 244/1010
Discharge grid reference: NZ1143049200
Reporting years: 2025, 2024, 2023, 2022, 2021
Catchment: Smallhope Burn from Source to Browney, Stocke

Location

Fellside CSO (Der 174)
54.83749, -1.82357

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

Butsfield Lane CSO Der0921.2 km East Of Knitsley Grange Farm CSO1.2 km Sixth St SSO1.4 km Knitsley Sewage Treatment Works1.5 km 5 South Street CSO, Crookhall1.6 km

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