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River health blog

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Learn a little more about the way our wastewater business operates from those who know it best. Our team of experts will be posting regular updates about how our storm discharge activity links with what you see on our map.

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Aerial photo of esher sewage treatment works, green trees and the River Mole

How our wastewater treatment process works

Monday 27th February 2023

Every day our business treats the waste for about 15 million customers across London and the Thames Valley. This works out as about 4.6 billion litres of sewage entering our sewer network every day.

What happens next? Our education manager Paul Hampton explains how the wastewater treatment process works.

Find out how we treat sewage