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Last reviewed: 7.12.2012 - 11.24am
We invest around £1bn each year on improving our water and wastewater network.
Our interactive map shows what we've got planned in your area.
We've developed three major engineering schemes to help stop sewer overflows and improve water quality in the River Thames.
We've replaced more than 1,600 miles of old water mains to reduce leaks and bursts and improve supplies for a growing population.
We're investing £346m to reduce the threat of sewer flooding at 2,500 properties by 2015.
One of the largest sewage treatment works in the UK, Mogden covers an area of 55 hectares.