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Aldford Sewage Treatment Works: sewage overflow history

Review available Environment Agency annual monitoring returns for Aldford Sewage Treatment Works. 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

2021

2022

2023

107

2024

2025

Year	Counted spills	Total spill duration (hours)	Monitor operation (%)
2025	54	330.25	99.77
2024	107	976.25	99.79
2023	99	721	99.99
2022	77	362.5	99.98
2021	92	779.75	99.8

Published record details

Reference: DCW00012
Location: Aldford Brook
Coordinates: 53.12981, -2.86596
Watercourse: Aldford Brook
Sewerage company: Dwr Cymru Welsh Water
Asset type: Inlet SO at WwTW
Permit reference: CM0115201
Discharge grid reference: SJ4215659533
Reporting years: 2025, 2024, 2023, 2022, 2021
Catchment: Aldford Brook

Location

Aldford Sewage Treatment Works
53.12981, -2.86596

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

Saighton Sewage Treatment Works3.4 km Handbridge Greenbank Sps5.2 km Marlston-Cum-Lache Pumping Station5.3 km Chester Belgrave Park Sps5.4 km Marlston Cum Lache PS SSO5.6 km

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