In 1865, Sir Joseph Bazalgette’s London sewage system was opened. 150 years later the sewers are at the limits of their capacity. In 2012, 57 combined sewer overflows discharged 39 million tonnes of sewage into the River Thames. Over the next 10 years Thames Water is planning major improvements to the London sewer system. These improvements will help protect the Thames from increasing pollution for at least the next 100 years.