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Hoylandswaine STW: sewage overflow history (YWS00123)

Review available Environment Agency annual monitoring returns for Hoylandswaine 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

128

2020

115

2021

2022

134

2023

146

2024

2025

Year	Counted spills	Total spill duration (hours)	Monitor operation (%)
2025	98	1,264.5	99.95
2024	146	1,437.75	99.98
2023	134	2,246.5	99.98
2022	86	950	99.2
2021	115	659.25	96.73
2020	128	2,214.27	77.82

Published record details

Reference: YWS00123
Location: Silkstone Beck from Source to Cawthorne Dyke
Coordinates: 53.54725, -1.59550
Watercourse: Ellhirst Beck
Sewerage company: Yorkshire Water
Asset type: Storm tank at WwTW
Permit reference: 2344
Discharge grid reference: SE2690005700
Reporting years: 2025, 2024, 2023, 2022, 2021, 2020
Catchment: Silkstone Beck from Source to Cawthorne Dyke

Location

Hoylandswaine STW
53.54725, -1.59550

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

Hoylandswaine STW0 km Tivydale Road CSO2 km Silkstone CSO2.5 km Silkstone STW2.7 km Springvale CSO2.7 km

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