Combined Sewer Storm Overflow Detailed Event Duration Monitoring Data

This Water Company data shows storm overflow event duration monitor activations. The activations are recorded at the start and the stop of each potential discharge. The data has not been subject to any formal verification by the Environment Agency. The data covers all 10 water and Sewerage companies that operate in England.
The data is split into Water Companies and each spreadsheet covers one calendar year. Attribution statement: © Environment Agency copyright and/or database right 2026. All rights reserved.
Publisher name: Environment Agency
Last updated: 2026-05-11T00:06:16Z