Failures of Thames Water

Published On: 28th October 2025

In the Environment Agency’s Environment Performance assessment (EPA) for 2024 here, Thames Water was the worst performing of the nine water and sewage companies. It had the highest number of serious pollution incidents, more than doubled since 2023.

Most incidents were from foul sewers and self-reporting from this asset type is far too low (73%). Of serious pollution incidents 63% (47 out of 75) were self-reported by the water companies, a decline from 74% in 2023.

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