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Slaley STW: sewage overflow history (NWL01211)

Review available Environment Agency annual monitoring returns for Slaley 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

2020

2023

2024

2025

Year	Counted spills	Total spill duration (hours)	Monitor operation (%)
2025	36	159.32	99.21
2024	18	9.66	100
2023	16	19.85	100
2020	26	70.95	100

Published record details

Reference: NWL01211
Location: March Burn Catchment (trib of Tyne)
Coordinates: 54.91037, -2.02650
Watercourse: Flothers Burn
Sewerage company: Northumbrian Water
Asset type: Inlet SO at WwTW
Permit reference: 233/1178
Discharge grid reference: NY9839957296
Reporting years: 2025, 2024, 2023, 2020
Catchment: March Burn Catchment (trib of Tyne)

Location

Slaley STW
54.91037, -2.02650

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

Slaley STW0 km Riding Mill Village Sps5.5 km Broomhaugh Sewage Treatment Works6.5 km Broomley STW CSO6.5 km Station Road CSO6.8 km

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