Written Question·Department for Environment, Food and Rural Affairs·UIN 116626

Thames Water: Sewage

Tabled: 27 February 2026

Answered: 9 March 2026

Question

Mr Lee Dillon

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.

Answer

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 W...

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