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Thames Water: Sewage

Asked by Mr Lee DillonLiberal DemocratDepartment for Environment, Food and Rural AffairsTabled Answered 9 March 2026UIN 116626

The question

To ask the Secretary of State for Environment, Food and Rural Affairs, whether her department has plans to mandate real time, publicly available MCERTS certified data for all storm overflow and treatment flows by Thames Water.

Answered by Emma Hardy

The Environment Act 2021 requires all water companies, including Thames Water, to publish near real time Event Duration Monitoring (EDM) data for all storm overflows. EDM installation follows specifications set out in the CIWEM (Chartered Institution of Water and Environmental Management) Event Duration Monitoring Good Practice Guide to ensure robust data quality.

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