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Lower Underhill CSO: sewage overflow history

Review available Environment Agency annual monitoring returns for Lower Underhill 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	5	7	92.36
2024	12	57.25	91.79
2023	11	11	99.95
2022	7	7.75	99.83
2021	35	283.5	99.69
2020	36	91.97	99.66

Published record details

Reference: YWS00613
Location: Esk from Sleddale Beck to Ruswarp
Coordinates: 54.43851, -0.80168
Watercourse: Unnamed Trib Of River Esk
Sewerage company: Yorkshire Water
Asset type: SO on sewer network
Permit reference: 27/29/0118
Discharge grid reference: NZ7782005450
Reporting years: 2025, 2024, 2023, 2022, 2021, 2020
Catchment: Esk from Sleddale Beck to Ruswarp

Location

Lower Underhill CSO
54.43851, -0.80168

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

Glaisdale STW0.2 km Lealholm Sewage Treatment Works2.4 km Lealholm Sewage Pumping Station2.7 km Egton Bridge Sewage Treatment Works3.1 km Grosmont STW4.8 km

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