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Grasby STW: sewage overflow history

Review available Environment Agency annual monitoring returns for Grasby 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

2021

2022

2023

2024

2025

Year	Counted spills	Total spill duration (hours)	Monitor operation (%)
2025	32	349.5	100
2024	46	483.5	97.78
2023	62	667.75	100
2022	39	292.75	100
2021	23	92.75	100

Published record details

Reference: AWS00479
Location: N Kelsey Beck Catchment (trib of Ancholme)
Coordinates: 53.52397, -0.36287
Watercourse: Kettleby Beck
Sewerage company: Anglian Water
Asset type: Storm tank at WwTW
Permit reference: ANNNF1077
Discharge grid reference: TA0863004280
Reporting years: 2025, 2024, 2023, 2022, 2021
Catchment: N Kelsey Beck Catchment (trib of Ancholme)

Location

Grasby STW
53.52397, -0.36287

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

Caistor Water Recycling Centre3.8 km Brigg Road Sps4.3 km Howsham - Cadney Road Tps4.4 km North Kelsey-Brigg Road Tps4.5 km North Kelsey Water Recycling Centre4.6 km

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