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Lendal Hill Combined Sewer Overflow: sewage overflow history

Review available Environment Agency annual monitoring returns for Lendal Hill 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

2020

102

2021

2022

114

2023

108

2024

2025

Year	Counted spills	Total spill duration (hours)	Monitor operation (%)
2025	89	1,125.47	99.26
2024	108	1,296.07	100
2023	114	1,356.62	99.99
2022	85	741.15	100
2021	102	1,036.3	99.66
2020	91	1,301.57	100

Published record details

Reference: YWS00442
Location: Ouse from River Nidd to Stillingfleet Beck
Coordinates: 53.96017, -1.08713
Watercourse: River Ouse
Sewerage company: Yorkshire Water
Asset type: SO on sewer network
Permit reference: 27/24/0417
Discharge grid reference: SE5999451950
Reporting years: 2025, 2024, 2023, 2022, 2021, 2020
Catchment: Ouse from River Nidd to Stillingfleet Beck

Location

Lendal Hill Combined Sewer Overflow
53.96017, -1.08713

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.

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