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Ampleforth CSO: sewage overflow history

Review available Environment Agency annual monitoring returns for Ampleforth CSO. 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

2021

2022

2023

2024

2025

Year	Counted spills	Total spill duration (hours)	Monitor operation (%)
2025	13	12.75	99.99
2024	11	15.5	76.17
2023	11	7.75	86.22
2022	8	2.75	99.42
2021	11	3.5	84.59
2020	13	4.77	100

Published record details

Reference: YWS01152
Location: Holbeck from Source to Marrs Beck
Coordinates: 54.19529, -1.10924
Watercourse: Tributary Of Holbeck
Sewerage company: Yorkshire Water
Asset type: SO on sewer network
Permit reference: WADC1140
Discharge grid reference: SE5821478092
Reporting years: 2025, 2024, 2023, 2022, 2021, 2020
Catchment: Holbeck from Source to Marrs Beck

Location

Ampleforth CSO
54.19529, -1.10924

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

Ampleforth Village STW0.4 km Ryedale Carr Lane CSO0.7 km Wass Sewage Treatment Works2.3 km Permit applied for4 km Permit applied for4.1 km

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