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Hill Street Combined Sewer Overflow: sewage overflow history

Review available Environment Agency annual monitoring returns for Hill Street Combined Sewer Overflow. 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

2022

2023

2024

2025

Year	Counted spills	Total spill duration (hours)	Monitor operation (%)
2025	6	0.4	100
2024	52	114.9	96.7
2023	6	0.53	65.64
2022	0	0	88.87

Published record details

Reference: WXW00537
Location: Siston Bk - source to conf R Avon (Brist)
Coordinates: 51.45353, -2.48027
Watercourse: Siston Brook Via Sws
Sewerage company: Wessex Water
Asset type: SO on sewer network
Permit reference: 101749
Discharge grid reference: ST6672572837
Reporting years: 2025, 2024, 2023, 2022
Catchment: Siston Bk - source to conf R Avon (Brist)

Location

Hill Street Combined Sewer Overflow
51.45353, -2.48027

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

Orchard Road CSO0 km 42 Orchard Vale CSO0 km Mill Lane Combined Sewer Overflow0.5 km Ullswater Close Pumping Station0.9 km 170 New Cheltenham Road CSO1.6 km

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