What was the cause of cholera outbreak in London 1854?

The cause of the cholera outbreak in London in 1854 was contaminated water. The outbreak was traced to a specific water pump on Broad Street, which was located near a cesspit that had leaked into the water supply. The contaminated water was then consumed by residents, leading to the spread of the disease. The outbreak prompted significant improvements in public health infrastructure, including the construction of proper sanitation systems and the provision of clean drinking water, which helped to prevent future outbreaks of cholera.