The committee found that the most contaminated water supply came from the South London water companies , Southwark and Vauxhall .
They were to study the atmospheric environment in London ; however , they were also to examine samples of water from several water companies in London .
The committee found that the most contaminated water supply came from the London   water companies , Southwark and Vauxhall .
They were to study the atmospheric environment in London ; however , they were also to examine samples of water from several water companies in London .