<P> The construction of Water tunnel No. 3 is intended to provide the city with a critical third connection to its Upstate New York water supply system, allowing the city to close tunnels No. 1 and No. 2 for repair for the first time of their history . The tunnel will eventually be more than 60 miles (97 km) long . Construction on the tunnel began in 1970, and its first and second phases are completed . The latter opened with a ceremony under Central Park, in 2013 . Completion of all phases is not expected until at least 2020 . </P> <P> In 2018, New York City announced a US $1 billion investment to protect the integrity of its municipal water system and to maintain the purity of its unfiltered water supply . </P>

Where does new york city get their water from