High Quality Content by WIKIPEDIA articles! London`s water supply infrastructure has developed over the centuries in line with the expansion of London and now represents a sizeable infrastructure investment. For much of London`s history, private companies supplied fresh water to various parts of London from the River Thames and the River Lea. A crisis point was reached in the mid 19th century with outbreaks of cholera and general problems arising from extraction of water from the polluted Tideway, and major new facilities were built up river at Hampton and Molesey. After merger and nationalization into the Metropolitan Water Board, and later reprivatization, their modern descendent Thames Water still runs London`s water supply infrastructure.