The First Vienna Mountain Spring Pipeline (I. Wiener Hochquellenwasserleitung) is a major part of Vienna's water supply and was the first source of safe drinking water for that city. The 95 km long line was opened on 24 October 1873, after four years of construction. Today, it delivers 62 million cubic meters of water per year (53% of Vienna's total supply in 2007). The water comes from high springs in the Rax and Schneeberg areas in Southern Lower Austria and Styria.