Sewage Tank Cleaning

Balcombe Wastewater Treatment Works: sewage overflow history (SWS00035)

Review available Environment Agency annual monitoring returns for Balcombe Wastewater Treatment Works. 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	33	416.02	99.99
2024	59	474.15	85.1
2023	98	1,246.96	99.7
2022	69	955.88	100
2021	58	541.95	100

Published record details

Reference: SWS00035
Location: Ouse from Slaugham to Ardingly Resevoir
Coordinates: 51.04112, -0.12767
Watercourse: Unnamed Trib Of River Ouse
Sewerage company: Southern Water
Asset type: Storm tank at WwTW
Permit reference: A01510
Discharge grid reference: TQ3136028530
Reporting years: 2025, 2024, 2023, 2022, 2021
Catchment: Ouse from Slaugham to Ardingly Resevoir

Location

Balcombe Wastewater Treatment Works
51.04112, -0.12767

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

Balcombe Wastewater Treatment Works0 km St James Cottage Balcombe CSO2.1 km Staplefield WWTW3.6 km Ardingly WWTW3.7 km Ardingly WWTW, Ardingly3.7 km

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