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Fir Tree STW: sewage overflow history

Review available Environment Agency annual monitoring returns for Fir Tree STW. 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

118

2023

108

2024

2025

Year	Counted spills	Total spill duration (hours)	Monitor operation (%)
2025	56	555.7	97.59
2024	108	939.26	99.85
2023	118	1,241.75	92.29

Published record details

Reference: NWL00555
Location: Wear from Houselop Beck to Beechburn Beck
Coordinates: 54.70239, -1.78910
Watercourse: Wadley Burn
Sewerage company: Northumbrian Water
Asset type: Storm tank at WwTW
Permit reference: 241/1013
Discharge grid reference: NZ1368934172
Reporting years: 2025, 2024, 2023
Catchment: Wear from Houselop Beck to Beechburn Beck

Location

Fir Tree STW
54.70239, -1.78910

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

Woodfield Hill Crook CSO1.8 km The Hollows CSO Wv492.6 km The Hollows CSO Wv502.7 km West Road CSO2.8 km Ulswater Crescent CSO3.1 km

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