Event Duration Monitoring - Storm Overflows - Bathing Season Returns

Published by:
Environment Agency
Last updated:
04 March 2026
Topic:
Not added
Licence:
Other Licence
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Summary

This Event Duration Monitoring (EDM) dataset relates to the performance of storm overflows in England. Water and Sewerage Companies (WaSC) submit this data to the Environment Agency each year as part of the Bathing Season Return, in order to fulfil their permitted conditions to discharge from these storm overflows under the Environmental Permitting Regulations.

Data files are provided by year and, where applicable, include a separate sheet for each WaSC with storm overflows in England. Each WaSC sheet shows how often and for how long each monitored storm overflow discharged during the EDM Bathing Season (1 May – 30 September). The dataset also explains why EDM may have provided information for less than 90% of the relevant return period, and why an overflow may have high spill counts during that time. These datasets reflect the best information available to the WaSC at the time of submission.

The datasets from 2023 onwards also include key summary data tables. These summary tables provide information such as the number of storm overflows with EDM, the number returning spill counts, and the average spill duration and average spill count for each WaSC.

A dataset README guide is also provided from the 2025 dataset onwards, offering further information to help users understand and interpret the data. Attribution statement: © Environment Agency copyright and/or database right 2025. All rights reserved.

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Data links

Link to the data Format File added Data preview
EDM_2025_Storm_Overflow_Bathing_Season_Return.zip ZIP 04 March 2026 Not available
EDM_2024_Storm_Overflow_Bathing_Season_Return.zip ZIP 04 March 2026 Not available
EDM_2023_Storm_Overflow_Bathing_Season_Return.zip ZIP 04 March 2026 Not available
EDM_2022_Storm_Overflow_Bathing_Season_Return.zip ZIP 04 March 2026 Not available

Additional information

View additional metadata
Added to data.gov.uk
2026-03-02
Access contraints
There are no public access constraints to this data. Use of this data is subject to the licence identified.
Harvest GUID
258d1141-1eae-4d3b-8d27-22f115853097
Extent
Latitude: 55.816° to °
Longitude: -6.236° to 2.072°
Spatial reference system
http://www.opengis.net/def/crs/EPSG/0/27700
Dataset reference date
2026-02-19 (creation)
2026-03-04 (publication)
2026-03-02 (revision)
Frequency of update
annually
Responsible party
Environment Agency (pointOfContact)
ISO 19139 resource type
dataset
Metadata language
eng
Source Metadata
XML
HTML

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Licence information

Open Government Licence